Service Informat ion Trucks Group 28 Release1 Engine Control Module (ECM), Aftertreatment Control Module (ACM), Electrical System Version3 Diagnostic Trouble Code (DTC) 89091093
Foreword The descriptions and service procedures contained in this manual are based on designs and technical studies carried out through January 2013. The products are under continuous development. Vehicles and components produced after the above date may therefore have different specifications and repair methods. When this is deemed to have a significant bearing on this manual, an updated version of this manual will be issued to cover the changes. The new edition of this manual will update the changes.
Troubleshooting.............................................................................................................................1 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) .........................................................
Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) Group 28 Troubleshooting Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) The manufacturer scan tool is the preferred tool for performing diagnostic work. Contact your local dealer for more information or visit “www.premiumtechtool.com”. Note: The use of a scan tool is necessary to perform diagnostic work as well as clearing of any diagnostic trouble codes (DTCs).
Group 28 System Electronic Control Unit (ECU) Overview System Electronic Control Unit (ECU) Overview The ECM monitors engine parameters to monitor the engine system's performance in real time. This is performed to aid the ECM with its self diagnostic capabilities. Many sensors are used for input to the emission control system.
Group 28 OBD2013 Code Definition OBD2013 Code Definition The Diagnostic Trouble Code follows a standardized format. All DTC’s have a letter followed by a 4-digit code. Here is a breakdown of what an OBD code means.
Group 28 4 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 06 = Algorithm Based Failures 07 = Mechanical Failures 08 = Bus Signal/Message Failures 09 = Component Failures 10 = ISO/SAE reserved 11 = Circuit short to ground 12 = Circuit short to battery 13 = Circuit open 14 = Circuit short to ground or open 15 = Circuit short to battery or open 16 = Circuit voltage below threshold 17 = Circuit voltage above threshold 18 = Circuit current below threshold 19 = Circuit current above threshold 1A
Group 28 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • OBD2013 Code Definition 2B = ISO/SAE reserved 2C = ISO/SAE reserved 2D = ISO/SAE reserved 2E = ISO/SAE reserved 2F = Signal erratic 30 = ISO/SAE reserved 31 = No signal 32 = Signal low time < minimum 33 = Signal low time > maximum 34 = Signal high time < minimum 35 = Signal high time > maximum 36 = Signal frequency too low 37 = Signal frequency too high 38 = Signal frequency incorrect 39 = Signal has too few pulses 3A = Signal has too
Group 28 6 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 4B = Over temperature 4C = ISO/SAE reserved 4D = ISO/SAE reserved 4F = ISO/SAE reserved 50= ISO/SAE reserved 51 = Not programmed 52 = Not activated 53 = Deactivated 54 = Missing calibration 55 = Not configured 56 = ISO/SAE reserved 5A = ISO/SAE reserved 5B = ISO/SAE reserved 5C = ISO/SAE reserved 5D = ISO/SAE reserved 5F = ISO/SAE reserved 60 = ISO/SAE reserved 61 = Signal calculation failure 62 = Signal compare failure 63 = Circu
Group 28 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • OBD2013 Code Definition 71 = Actuator stuck 72 = Actuator stuck open 73 = Actuator stuck closed 74 = Actuator slipping 75 = Emergency position not reachable 76 = Wrong mounting position 77 = Commanded position not reachable 78 = Alignment or adjustment incorrect 79 = Mechanical linkage failure 7A = Fluid leak or seal failure 7B = Low fluid level 7C = ISO/SAE reserved 7D = ISO/SAE reserved 7C = ISO/SAE reserved 7D = ISO/SAE reserved 7F
Group 28 • • • • 8 90 = ISO/SAE reserved 91 = Parametric 92 = Performance or incorrect operation 93 = No operation OBD2013 Code Definition
Group 28 OBD2013 Diagnostic Trouble Codes (DTC) OBD2013 Diagnostic Trouble Codes (DTC) “P0016 Camshaft Position Sensor: Rationality Low”, page 95 “P0046 VGT Position Actuator: VGT Mechanical Fault”, page 118 “P006E VGT Position Actuator: Low Supply Voltage”, page 120 “P0070 Ambient Air Temperature Sensor (AAT): Open Circuit”, page 129 “P0072 Ambient Air Temperature Sensor (AAT): Short Circuit Low”, page 129 “P009A Intake Manifold Temperature Sensor (IMT): Rationality Monitor”, page 78 “P00AF VGT Position
Group 28 “P02CF Single Cylinder High Mass Flow Monitor (Cylinder 2)”, page 20 “P02D1 Single Cylinder High Mass Flow Monitor (Cylinder 3)”, page 20 “P02D3 Single Cylinder High Mass Flow Monitor (Cylinder 4)”, page 21 “P02D5 Single Cylinder High Mass Flow Monitor (Cylinder 5)”, page 21 “P02D7 Single Cylinder High Mass Flow Monitor (Cylinder 6)”, page 22 “P0300 Misfire Multiple Cylinders”, page 29 “P0301 Single Cylinder Low Mass Flow Monitor (Cylinder 1)”, page 23 “P0301 Misfire Single Cylinder (Cylinder 1)”,
Group 28 OBD2013 Diagnostic Trouble Codes (DTC) “P04DB Crankcase Ventilation: Disconnected Pipe/Separator Monitor”, page 67 “P04D9 EGR System: Feedback Control (Saturated Low)”, page 39 “P04DA EGR System: Feedback Control (Saturated High)”, page 39 “P0500 Wheel Based Vehicle Speed: Vehicle Speed Sensor (VSS): Open Circuit”, page 131 “P0502 Wheel Based Vehicle Speed: Vehicle Speed Sensor (VSS): Short Circuit Low”, page 131 “P0506 Idle Engine Speed Rationality: Idle Speed Low”, page 141 “P0507 Idle Engine S
Group 28 OBD2013 Diagnostic Trouble Codes (DTC) “P2031 Post-DOC Temperature Sensor: Open Circuit Check”, page 86 “P2032 Post-DOC Temperature Sensor: Short Circuit Low”, page 86 “P2047 Aftertreatment SCR Dosing Valve: Open Circuit”, page 116 “P2048 Aftertreatment SCR Dosing Valve: Short Circuit Low”, page 117 “P2049 Aftertreatment SCR Dosing Valve: Short Circuit High”, page 116 “P204A Aftertreatment DEF Pump Pressure Sensor: Open Circuit”, page 114 “P204B Aftertreatment DEF Pump Pressure Sensor: Rationalit
Group 28 OBD2013 Diagnostic Trouble Codes (DTC) “P220F NOx Sensor #2: Sensor Start Up Monitor”, page 59 “P221A NOx Sensors: NOx Sensor Measurement Rationality Monitor”, page 61 “P2226 Barometric Pressure Sensor (BPS): Open Circuit Check”, page 69 “P2227 Barometric Pressure Sensor (BPS): Rationality Monitor”, page 68 “P2229 Barometric Pressure Sensor (BPS): Short Circuit High”, page 69 “P225C Inlet and Outlet NOx Sensor Stuck High ”, page 52 “P225E NOx Sensor #2: Rationality High Monitor”, page 58 “P226C B
Group 28 Definitions and Terminology Confirmed Fault Code: The diagnostic trouble code (DTC) stored when an OBD system has confirmed that a malfunction exists. Continuous Monitors: Monitors that are always running after enabling criteria has been met. Deactivate: Means to turn-off, shutdown, desensitize, or otherwise make inoperable through software programming or other means during the actual life of the engine.
Group 28 Engine Start: Engine Start: Is defined as the point when the engine reaches a speed 150 rpm below the normal, warmed-up idle speed (as determined in the drive position for vehicles equipped with an automatic transmission). Fault Memory: Information pertaining to malfunctions stored in the onboard computer, including fault codes, stored engine conditions, and MIL status.
Group 28 On-Board Diagnostics (OBD): A term referring to a vehicle's self-diagnostic, monitoring and fault code reporting capability. Pending Fault Code: A DTC stored upon the initial detection of a malfunction (typically on a single drive cycle) prior to illumination of the MIL. Permanent Fault Code: A confirmed or MIL-on fault code that is currently commanding the MIL on and is stored in NVRAM.
Group 28 Fuel Pressure, Timing and Quantity Fuel Pressure, Timing and Quantity All cylinders may have pressure, timing and quantity deviations which result in significant change in engine performance and exhaust gas composition. These deviations may in part be used to diagnose and evaluate a faulty fuel system. Using the NOx sensors on the vehicle.
Group 28 P026D Fuel Injector (high mass flow) P026D Fuel Injector (high mass flow) DTC P026D Component / System Fuel System Monitoring Injection Quantity – High Monitor Strategy Description Actual air fuel ratio based fueling compared to expected Fault Limit Ratio = (Air fuel ratio based estimated fuel flow Modeled Fuel flow) > 1.
Fuel Pressure, Timing and Quantity Threshold – Single Cylinder High Mass Flow Group 28 Fuel Pressure, Timing and Quantity Threshold – Single Cylinder High Mass Flow This OBD monitor works by observing engine acceleration as measured by the crank angle sensor. This acceleration measurement is taken during a crank angle window where the current firing cylinder should be generating it’s torque.
Group 28 P02CF Single Cylinder High Mass Flow Monitor (Cylinder 2) P02CF Single Cylinder High Mass Flow Monitor (Cylinder 2) DTC P02CF Component / System Fuel System Monitoring Injection Quantity – High (Cylinder 2) Monitor Strategy Description Single cylinder fueling offset Fault Limit Fueling offset of any one injector at idle < -1.5 deg CA Enable Conditions • • • • • • • Disable Conditions Vehicle Speed < 0.
Group 28 P02D3 Single Cylinder High Mass Flow Monitor (Cylinder 4) P02D3 Single Cylinder High Mass Flow Monitor (Cylinder 4) DTC P02D3 Component / System Fuel System Monitoring Injection Quantity – High (Cylinder 4) Monitor Strategy Description Single cylinder fueling offset Fault Limit Fueling offset of any one injector at idle < -1.5 deg CA Enable Conditions • • • • • • • Disable Conditions Vehicle Speed < 0.
Group 28 P02D7 Single Cylinder High Mass Flow Monitor (Cylinder 6) P02D7 Single Cylinder High Mass Flow Monitor (Cylinder 6) DTC P02D7 Component / System Fuel System Monitoring Injection Quantity – High (Cylinder 6) Monitor Strategy Description Single cylinder fueling offset Fault Limit Fueling offset of any one injector at idle < -1.5 deg CA Enable Conditions • • • • • • • Disable Conditions Vehicle Speed < 0.
Fuel Pressure, Timing and Quantity Threshold – Single Cylinder Low Mass Flow Group 28 Fuel Pressure, Timing and Quantity Threshold – Single Cylinder Low Mass Flow The single cylinder low mass flow malfunction is monitored using the misfire detection monitor. See “Misfire Monitoring at Idle Conditions”, page 29 for detailed monitor descriptions.
Group 28 P0302 Single Cylinder Low Mass Flow Monitor (Cylinder 2) P0302 Single Cylinder Low Mass Flow Monitor (Cylinder 2) DTC P0302 Component / System Fuel System Monitoring Injection Quantity – Low (Cylinder 2) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiri
Group 28 P0303 Single Cylinder Low Mass Flow Monitor (Cylinder 3) P0303 Single Cylinder Low Mass Flow Monitor (Cylinder 3) DTC P0303 Component / System Fuel System Monitoring Injection Quantity – Low (Cylinder 3) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiri
Group 28 P0304 Single Cylinder Low Mass Flow Monitor (Cylinder 4) P0304 Single Cylinder Low Mass Flow Monitor (Cylinder 4) DTC P0304 Component / System Fuel System Monitoring Injection Quantity – Low (Cylinder 4) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiri
Group 28 P0305 Single Cylinder Low Mass Flow Monitor (Cylinder 5) P0305 Single Cylinder Low Mass Flow Monitor (Cylinder 5) DTC P0305 Component / System Fuel System Monitoring Injection Quantity – Low (Cylinder 5) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiri
Group 28 P0306 Single Cylinder Low Mass Flow Monitor (Cylinder 6) P0306 Single Cylinder Low Mass Flow Monitor (Cylinder 6) DTC P0306 Component / System Fuel System Monitoring Injection Quantity – Low (Cylinder 6) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiri
Group 28 Misfire Monitoring at Idle Conditions Misfire Monitoring at Idle Conditions This OBD monitor works by observing engine acceleration as measured by the crank angle sensor. This acceleration measurement is taken during a crank angle window where the current firing cylinder should be generating it’s torque. Acceleration is then filtered with a low pass filter and after all cylinders have fired, an average acceleration of all cylinders is generated.
Group 28 P0301 Misfire Single Cylinder (Cylinder 1) P0301 Misfire Single Cylinder (Cylinder 1) DTC P0301 Component / System Misfire Monitoring Misfire Single Cylinder (Cylinder 1) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiring < 4 Cylinders Engine Torque 0
Group 28 P0302 Misfire Single Cylinder (Cylinder 2) P0302 Misfire Single Cylinder (Cylinder 2) DTC P0302 Component / System Misfire Monitoring Misfire Single Cylinder (Cylinder 2) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiring < 4 Cylinders Engine Torque 0
Group 28 P0303 Misfire Single Cylinder (Cylinder 3) P0303 Misfire Single Cylinder (Cylinder 3) DTC P0303 Component / System Misfire Monitoring Misfire Single Cylinder (Cylinder 3) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiring < 4 Cylinders Engine Torque 0
Group 28 P0304 Misfire Single Cylinder (Cylinder 4) P0304 Misfire Single Cylinder (Cylinder 4) DTC P0304 Component / System Misfire Monitoring Misfire Single Cylinder (Cylinder 4) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiring < 4 Cylinders Engine Torque 0
Group 28 P0305 Misfire Single Cylinder (Cylinder 5) P0305 Misfire Single Cylinder (Cylinder 5) DTC P0305 Component / System Misfire Monitoring Misfire Single Cylinder (Cylinder 5) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiring < 4 Cylinders Engine Torque 0
Group 28 P0306 Misfire Single Cylinder (Cylinder 6) P0306 Misfire Single Cylinder (Cylinder 6) DTC P0306 Component / System Misfire Monitoring Misfire Single Cylinder (Cylinder 6) Monitor Strategy Description Single cylinder engine flywheel acceleration evaluation Fault Limit Number of misfire events per cylinder 400 out of 500 Enable Conditions • • • • • • • • • • • Disable Conditions Average Engine Speed 525 - 725 RPM PTO Not Active Number of Cylinders Misfiring < 4 Cylinders Engine Torque 0
Group 28 Exhaust Gas Recirculation (EGR) System Monitoring Exhaust Gas Recirculation (EGR) System Monitoring This OBD monitor is designed to detect conditions where the EGR mass flow is lower or higher than demanded by the current system operation. Demanded EGR mass flow is modeled from the burned air fraction (see the Technical Description for detailed information) request for the current engine operating conditions.
Group 28 P0402 EGR System (High Flow) P0402 EGR System (High Flow) DTC P0402 Component / System EGR System - High Flow Monitor Strategy Description Compare demanded EGR flow to actual Fault Limit Ratio = (Measured EGR mass flow Modeled EGR mass flow) > 4.0 Enable Conditions • • • • • • • Disable Conditions Engine Speed 600 - 1600 RPM Engine Torque 400 - 2450 Nm EGR Position 0 - 80 % EGR Flow Demand 0 0.
Group 28 EGR: Slow Response Emission Threshold EGR: Slow Response Emission Threshold This OBD monitor evaluates a slowly responding EGR system by comparing two evaluation windows. Within a window, demanded EGR flowrate is evaluated. If a transition occurs within an allowable time, the demanded EGR flow is compared to the actual flow at the target time to determine if the proper flow was achieved. If the flow is not achieved then a DTC is raised.
Group 28 EGR: Feedback Saturation EGR: Feedback Saturation This OBD monitor indicates if the burned air fraction error is saturated against a high or low limit. The logic for the monitor evaluates the time spent at saturation and compares the ratio between the time spent in a saturation mode and the total time with engine running. A fault is reported whenever the ratio exceeds the fault limit.
Group 28 Boost Pressure: Under or Over Boost Emission Threshold Boost Pressure: Under or Over Boost Emission Threshold This OBD monitor is designed to detect under or over boost conditions. Under Boost: Threshold < (Actual boost pressure - Modeled boost pressure) A modeled version of boost pressure is calculated continuously from a map based on engine speed and torque. The modeled boost pressure is compared to the actual value read from the boost pressure sensor.
Group 28 P0234 Boost Pressure: Overboost P0234 Boost Pressure: Overboost DTC P0234 Component / System Boost Pressure - Overboost Monitor Strategy Description Comparison of actual boost pressure to a modeled boost pressure Fault Limit Delta = Actual boost pressure - Modeled boost pressure > 120 kPa Enable Conditions • • • • • • Disable Conditions Engine Speed 1350 - 1700 RPM EGR Position 10 - 96% VGT Position 5 - 90% Ambient Air Temperature -8 - 55 °C Barometric Pressure 75 - 105 kPa Coolant Tem
Group 28 Boost Pressure: Slow Response Boost Pressure: Slow Response This OBD monitor is designed to detect conditions where the boost system is slow to respond, indicating degradation in the boost system. The monitor defines a low boost and a high boost window based on appropriate engine operating conditions. When the engine is being operated in the low window, boost pressure is sampled continuously. When operating conditions move out of the low window, the last boost pressure value is retained.
Non–Methane Hydrocarbon (NMHC) Converting Calalyst: Conversion Efficiency Emission Threshold Group 28 Non–Methane Hydrocarbon (NMHC) Converting Calalyst: Conversion Efficiency Emission Threshold The Diesel Oxidation Catalyst (DOC) is constructed from a porous ceramic substrate coated in precious metals.
Group 28 P0421 NMHC Catalyst: Missing Substrate P0421 NMHC Catalyst: Missing Substrate DTC P0421 Component / System NMHC Catalyst - Missing Substrate Monitor Strategy Description Compare engine exhaust temperature rate of change to DOC temperature rate of change Fault Limit Ratio = Engine exhaust temperature rate of change DOC temperature rate of change < 1.5 Enable Conditions • • • • Disable Conditions Exhaust Gas Temperature Derivative > 3.75 °C/s or < -3.
Oxides of Nitrogen (NOX) Converting Catalyst: Conversion Efficiency Emission Threshold Group 28 Oxides of Nitrogen (NOX) Converting Catalyst: Conversion Efficiency Emission Threshold This OBD monitor is designed to determine the DEF efficiency as calculated by using the inputs of the commanded DEF and the two NOx sensors located upstream and downstream of the NOx Catalyst. The DEF efficiency evaluation is calculated as an average value over an accumulated exhaust NOx value.
Group 28 P0420 NOx Catalyst: Missing SCR P0420 NOx Catalyst: Missing SCR DTC P0420 Component / System NOx Catalyst - Missing SCR Monitor Strategy Description Missing Substrate Fault Limit Calculated NOx conversion efficiency DOC temperature rate of change < 66% Enable Conditions • • • • • • • • • Disable Conditions Engine Speed 1400 - 1800 RPM Exhaust Mass Flow > 0.33 kg/s System Out NOx Flow > 0.
Group 28 NOx Catalyst: Reductant Delivery Emission Threshold NOx Catalyst: Reductant Delivery Emission Threshold A faulty DEF delivery system operation will impact the NOx emissions and subsequently a low DEF efficiency will be detected. The fault separation from conversion efficiency is achieved by using an aftermarket/service routine.
Group 28 NOx Catalyst: Feedback: Slow/Fails to Enter: Default CL NOx Catalyst: Feedback: Slow/Fails to Enter: Default CL This diagnostic function indicates if the DEF feedback control is saturated against a high or low limit. The logic for this diagnostic evaluates the time spent at saturation and compares the ratio between the time spent in a saturation mode and the total time with the engine running. A fault is reported whenever the ratio exceeds a fault limit.
Particulate Matter (PM) Filter Monitoring: Filter Emission Threshold Group 28 Particulate Matter (PM) Filter Monitoring: Filter Emission Threshold Failures that result in a reduction to the DPF’s filtration efficiency, such as cracked or melted filter, are monitored by comparing the soot accumulation calculated by a physical DPF delta Pressure (DPF dP) sensor based soot model (Pressure Model) to the soot accumulation predicted by a chemical reaction based soot model (Chemical Model).
Group 28 PM Filter: Missing Substrate Functional PM Filter: Missing Substrate Functional The Diesel Particulate Filter is constructed from a porous ceramic substrate coated in precious metals. The porous nature of the DPF results in a certain level of differential pressure (DPF dP) between the inlet and outlet of the DPF, dependant on the exhaust mass flow, the temperature at the inlet of the DPF, and the temperature at the outlet of the DPF.
Group 28 NOx Sensor #1: Emission Threshold NOx Sensor #1: Emission Threshold In addition to the circuitry monitors, the two NOx sensors are subjected to plausibility checks as part of the NOx sensor diagnostics. The two NOx sensors are monitored to ensure that they are capable of accurately evaluating the NOx exhaust emissions and that they can be used by the engine emissions control strategies.
Group 28 P225C Inlet and Outlet NOx Sensor Stuck High P225C Inlet and Outlet NOx Sensor Stuck High The monitor is performed during no fueling (motoring) conditions where the expected amount of exhaust NOx concentration DTC P225C Component / System NOx Sensor #1 - Rationality High Monitor Strategy Description Rationality High Fault Limit NOx sensor value > 200 PPM Enable Conditions • • Disable Conditions Fueling Amount < 0.
Group 28 NOx Sensor #1: Heater Performance NOx Sensor #1: Heater Performance This OBD monitor is designed to detect faulty startup behavior. The function monitors the time from enable command sent to the time when the sensor reports full readiness. If the time is greater than the fault limit a DTC is set.
Group 28 NOx Sensor #1: Bad Device NOx Sensor #1: Bad Device This OBD Monitoris designed to to detect bad sensor quality. The function monitors the time when the sensor reports bad quality. If the time is greater than the fault limit a DTC is set.
Group 28 NOx Sensor #1: Circuit Monitors NOx Sensor #1: Circuit Monitors P2203 NOx Sensor #1: Short Circuit Low DTC P2203 Component / System NOx #1 Sensor - Short Circuit Monitor Strategy Description NOx Sensor Short Circuit Fault Limit Time with short circuit bad quality > 5 seconds Enable Conditions • • Disable Conditions Key On Active Battery Voltage > 8V No Active DTC's: • U029D Time Required For DTC To Be Set 10 seconds MIL Illumination 2 Drive Cycles Probable Causes See Tech Tool
Group 28 P220A NOx Sensor #1: Supply Voltage Out of Range P220A NOx Sensor #1: Supply Voltage Out of Range DTC P220A Component / System NOx Sensor #1 - Sensor Voltage Monitor Strategy Description Sensor evaluation of supply voltage Fault Limit Time with voltage out of range signal > 5 seconds Enable Conditions • Disable Conditions No Active DTC's: • Engine Speed > 500 RPM U029D Time Required For DTC To Be Set 10 seconds MIL Illumination 2 Drive Cycles Probable Causes See Tech Tool U02
Group 28 NOx Sensor #2: Emission Threshold NOx Sensor #2: Emission Threshold The rationality check for this sensor consists of sensor stuck low and stuck high check. It is performed whenever the engine operates on highly transient conditions. A fault condition is reached whenever the NOx sensor values are below or above a fault limit.
Group 28 P225E NOx Sensor #2: Rationality High Monitor P225E NOx Sensor #2: Rationality High Monitor DTC P225E Component / System NOx Sensor #2 - Rationality high Monitor Strategy Description Sensor Rationality Check Fault Limit NOX Sensor Value > 125 ppm Enable Conditions • • • • Disable Conditions Fueling Amount < 0.001 g/sec SCR Temperature 150 - 500 °C SCR Temperature Stability < 0.
Group 28 NOx Sensor #2: Heater Performance NOx Sensor #2: Heater Performance This OBD monitoris designed to detect faulty startup behavior. The function monitors the time from enable command sent (ok for sensor to heat itself since all water is considered to be evaporated from the exhaust stream) to the time when the sensor reports full readiness. If the time is too long the sensor does not fulfill the requirements.
Group 28 NOx Sensor #2: Bad Device NOx Sensor #2: Bad Device This OBD Monitoris designed to to detect bad sensor quality. The quality flag from the NOx sensor is monitored. Too long duration of not reliable sensor signal quality is considered as an error. When the NOx sensor is unable to maintain a reliable output, its signal quality will be set to not reliable. This can e.g. be the case during fast transients and fast variations in NOx Sensor measurement value.
Group 28 NOx Sensor #2: NOx Sensor Measurement Monitor NOx Sensor #2: NOx Sensor Measurement Monitor This OBD monitor consists of a NOx Sensor Measurement value comparison between the two NOx sensors. The fault condition is reached whenever the absolute difference between the NOx Sensor Measurement values exceeds the threshold.
Group 28 NOx Sensor #2: Circuit Monitors NOx Sensor #2: Circuit Monitors P22A1 NOx Sensor #2: Short Circuit Low DTC P22A1 Component / System NOx #2 Sensor - Short Circuit Monitor Strategy Description NOx Sensor Short Circuit Fault Limit Time with bad signal quality > 5 seconds Enable Conditions • • Disable Conditions Key On Active Battery Voltage > 8V No Active DTC's: • U029E Time Required For DTC To Be Set 10 seconds MIL Illumination 2 Drive Cycles Probable Causes See Tech Tool P229E
Group 28 P220B NOx Sensor #2: Supply Voltage Out of Range P220B NOx Sensor #2: Supply Voltage Out of Range DTC P220B Component / System NOx Sensor #2 - Sensor Voltage Monitor Strategy Description Sensor evaluation of supply voltage Fault Limit Time with voltage out of range signal > 5 seconds Enable Conditions • Disable Conditions No Active DTC's: • Key On > Active U029E Time Required For DTC To Be Set 10 seconds MIL Illumination 2 Drive Cycles Probable Causes See Tech Tool U029E NOx
Engine Cooling System: Time To Reach Threshold Temperature Group 28 Engine Cooling System: Time To Reach Threshold Temperature This OBD monitor evaluates the coolant thermostat. If the coolant temperature sensor value doesn’t reach the threshold or if the temperature decreases below the threshold during operation the thermostat is judged as faulty and a DTC is set.
Engine Coolant Temperature Sensor (ECT): Rationality Monitor Group 28 Engine Coolant Temperature Sensor (ECT): Rationality Monitor P0116 Engine Coolant Temperature Sensor (ECT): Sensor Stuck Low Monitor DTC P0116 Component / System Engine Coolant Temperature Sensor - ECT Stuck Low Monitor Monitor Strategy Description ECT Stuck Below the Highest Minimum Enable Temperature Fault Limit Delta = Coolant temperature sensor value - estimated coolant temperature > 3 °C Enable Conditions • • • • • • • Di
Group 28 Engine Coolant Temperature Sensor (ECT): Circuit Monitors Engine Coolant Temperature Sensor (ECT): Circuit Monitors The engine coolant temperature sensor is checked for open circuit, short circuit, or out-of-range value by monitoring the analog-to-digital (A/D) input voltage. P0115 Engine Coolant Temperature Sensor (ECT): Open Circuit Check DTC P0115 Component / System ECT - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 4.
Group 28 Crankcase Ventilation System: Disconnection Crankcase Ventilation System: Disconnection This OBD monitor diagnoses the crankcase ventilation system by looking at the crankcase pressure sensor value. By comparing the crankcase - to ambient pressure at two different states, one where the speed of the CCV separator is “HIGH” and the second where the speed of the CCV separator is “LOW”. The upper and lower limits for the crankcase pressure are established.
Group 28 Barometric Pressure Sensor (BPS): Rationality Monitor Barometric Pressure Sensor (BPS): Rationality Monitor This OBD rationality monitor for the Barometric Pressure sensor evaluates the plausibility of the sensor comparing the Barometric, Intake Air and Crankcase pressure sensor values. This evaluation is performed in two scenarios: Pre Cranking: A comparison of pressures from all sensors is made. The smallest difference between the three is determined and a reference pressure is calculated.
Group 28 Barometric Pressure Sensor (BPS): Circuit Monitors Barometric Pressure Sensor (BPS): Circuit Monitors The Barometric Pressure Sensor is checked for electrical failures by monitoring the analog-to-digital (A/D) input voltage. P2226 Barometric Pressure Sensor (BPS): Open Circuit Check DTC P2226 Component / System BPS Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage < 0.
Group 28 Intake Manifold Pressure Sensor (IMP): Rationality Monitor Intake Manifold Pressure Sensor (IMP): Rationality Monitor This OBD rationality monitor for the Intake Manifold Pressure sensor evaluates the plausibility of the sensor comparing the Barometric, Intake Air and Crankcase pressure sensor values. This evaluation is performed in two scenarios: Pre Cranking: A comparison of pressures from all sensors is made.
Group 28 Intake Manifold Pressure Sensor (IMP): Circuit Monitors Intake Manifold Pressure Sensor (IMP): Circuit Monitors The Intake Manifold Pressure Sensor is located in the inlet manifold and the sensor is checked for electrical failures by monitoring the analog-to-digital (A/D) input voltage. P0105 Intake Manifold Pressure Sensor (IMP): Open Circuit Check DTC P0105 Component / System IMP Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage < 0.
Aftertreatment Differential Pressure Sensor (DPS): Rationality Monitor Group 28 Aftertreatment Differential Pressure Sensor (DPS): Rationality Monitor This OBD monitor diagnoses the DPF differential pressure sensor, by monitoring the deviation between estimated DPF differential pressure and the measured DPF differential pressure value.
Aftertreatment Differential Pressure Sensor (DPS): Circuit Monitors Group 28 Aftertreatment Differential Pressure Sensor (DPS): Circuit Monitors The Aftertreatment Differential Pressure Sensor is checked for electrical failures by monitoring the analog-to-digital (A/D) input voltage. P2452 Aftertreatment Differential Pressure Sensor (DPS): Open Circuit Check DTC P2452 Component / System DPF - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 4.
Group 28 EGR Differential Pressure Sensor: Rationality Monitor EGR Differential Pressure Sensor: Rationality Monitor This OBD monitor diagnoses the EGR differential pressure sensor. This monitors the deviation between estimated EGR differential pressure and the measured EGR differential pressure value. There are two methods for monitoring the EGR differential pressure sensor: Zero Flow Condition: This monitors when the EGR differential pressure is supposed to be zero when the EGR valve closed.
Group 28 EGR Differential Pressure Sensor: Circuit Monitors EGR Differential Pressure Sensor: Circuit Monitors The EGR Differential Pressure Sensor is checked for electrical failures by monitoring the analog-to-digital (A/D) input voltage. P0409 EGR Differential Pressure Sensor: Open Circuit Check DTC P0409 Component / System DP Sensor - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage < 0.
Group 28 Crankcase Pressure Sensor (CPS): Rationality Monitor Crankcase Pressure Sensor (CPS): Rationality Monitor This OBD rationality monitor for the Crankcase Pressure sensor evaluates the plausibility of the sensor comparing the Barometric, Intake Air and Crankcase pressure sensor values. This evaluation is performed in two scenarios: Engine Pre-Cranking: A comparison of pressures from all sensors is made. The smallest difference between the three is determined and a reference pressure is calculated.
Group 28 Crankcase Pressure Sensor (CPS): Circuit Monitors Crankcase Pressure Sensor (CPS): Circuit Monitors The Crankcase Pressure Sensor is checked for electrical failures by monitoring the analog-to-digital (A/D) input voltage. P051A Crankcase Pressure Sensor (CPS): Open Circuit Check DTC P051A Component / System CPS - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage < 0.
Intake Manifold Temperature Sensor (IMT): Rationality Monitor Group 28 Intake Manifold Temperature Sensor (IMT): Rationality Monitor The Intake Manifold Temperature Sensor is monitored by comparing it with a calculated Intake Manifold temperature based on intake manifold pressure and ambient air temperature. When the evaluation time has elapsed the average difference is compared to an upper and a lower limit resulting in a low temperature and high temperature fault.
Group 28 Intake Manifold Temperature Sensor (IMT): Circuit Monitors Intake Manifold Temperature Sensor (IMT): Circuit Monitors The Intake Manifold Temperature sensor is checked for electrical failures by monitoring the analog-to-digital (A/D) input voltage. P0110 Intake Manifold Temperature Sensor (IMT): Open Circuit Check DTC P0110 Component / System IMT - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 4.
Group 28 EGR Temperature Sensor: Rationality Monitor EGR Temperature Sensor: Rationality Monitor This OBD monitor evaluates the rationality of the EGR temperature sensor. The monitor compares the EGR temperature with the coolant temperature during conditions where they should read the same temperature.
Group 28 EGR Temperature Sensor: Circuit Monitors EGR Temperature Sensor: Circuit Monitors The EGR Temperature Sensor is checked for electrical failures by monitoring the analog-to-digital (A/D) input voltage. P040A EGR Temperature Sensor: Open Circuit Check DTC P040A Component / System EGR Temperature Sensor - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 4.
Group 28 Exhaust Gas Temperature Sensors: Rationality Monitors Exhaust Gas Temperature Sensors: Rationality Monitors The exhaust gas system has three temperature sensors. The pre-DOC sensor measures the engine exhaust gas temperature, the post-DOC sensor measures the temperature downstream of the DOC, and the post-DPF sensor measures the temperature downstream of the DPF.
P2084 Exhaust Gas Temperature Sensor: Post-DOC Rationality Check Group 28 P2084 Exhaust Gas Temperature Sensor: Post-DOC Rationality Check DTC P2084 Component / System Post-DOC Temperature Sensor - Rationality Monitor Strategy Description Plausibility check of the sensor value Fault Limit Average DOC temperature deviation > 65 °C Enable Conditions • • • • • • • • Disable Conditions Exhaust Temperature < 15 °C DOC Temperature - DPF Temperature < 15 °C DPF Temperature - Exhaust Temperature < 15 °
P242B Exhaust Gas Temperature Sensors: Post-DPF Rationality Check Group 28 P242B Exhaust Gas Temperature Sensors: Post-DPF Rationality Check DTC P242B Component / System Post-DPF Temperature Sensor - Rationality Monitor Strategy Description Plausibility check of the sensor value Fault Limit Average DPF temperature deviation > 70 °C Enable Conditions • • • • • • • • Disable Conditions Modeled Exhaust Temperature < 15 °C Modeled DOC Temperature - DPF Temperature < 15 °C Modeled DPF Temperature -
Group 28 Exhaust Gas Temperature Sensors: Circuit Monitors Exhaust Gas Temperature Sensors: Circuit Monitors The Exhaust Gas Temperature Sensor circuits are monitored to check for electrical failures by monitoring the analog-to-digital (A/D) input voltages. P0544 Pre-DOC Temperature Sensor: Open Circuit Check DTC P0544 Component / System Pre-DOC Temperature Sensor - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 2.
Group 28 P2031 Post-DOC Temperature Sensor: Open Circuit Check P2031 Post-DOC Temperature Sensor: Open Circuit Check DTC P2031 Component / System Post-DOC Temperature Sensor - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 2.
Group 28 P242A Post-DPF Temperature Sensor: Open Circuit Check P242A Post-DPF Temperature Sensor: Open Circuit Check DTC P242A Component / System Post-DPF Temperature Sensor - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 2.
Group 28 Engine Oil Temperature Sensor Engine Oil Temperature Sensor The oil temperature sensor monitor is designed to detect a sensor that is reporting an unrealistic oil temperature value. P0196 Engine Oil Temperature Sensor (OTS): Rationality Monitor DTC P0196 Component / System OTS - Rationality Monitor Strategy Description Plausibility check of the sensor by checking if the temperature rises fast enough.
Group 28 Engine Oil Temperature Sensor: Circuit Monitors Engine Oil Temperature Sensor: Circuit Monitors The Engine Oil Temperature Sensor circuits are monitored to check for electrical failures by monitoring the analog-to-digital (A/D) input voltages. P0195 Engine Oil Temperature Sensor (OTS): Open Circuit Check DTC P0195 Component / System OTS - High Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 4.
Group 28 Engine Oil Pressure Sensor (OPS): Rationality Monitor Engine Oil Pressure Sensor (OPS): Rationality Monitor This OBD monitor is designed to detect a sensor that is reporting an unrealistic value. Engine oil pressure is checked during two conditions: Engine Pre-Cranking: When the engine is in the Pre-Cranking state, the Engine Oil Pressure is expected to be in a respectively low range, close to ambient pressure. If this range is exceeded, a Pre-Crank DTC is set.
Group 28 Engine Oil Pressure Sensor: Circuit Monitors Engine Oil Pressure Sensor: Circuit Monitors The Engine Oil Pressure Sensor circuits are monitored to check for electrical failures by monitoring the analog-to-digital (A/D) input voltages. P0520 Engine Oil Pressure Sensor (OPS): Open Circuit Check DTC P0520 Component / System OPS - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage < 0.
Group 28 Turbocharger Speed Sensor (TSS): Rationality Monitor Turbocharger Speed Sensor (TSS): Rationality Monitor This OBD monitor evaluates the turbo speed sensor for missing signal and for rationality faults. The turbo speed is compared during two working conditions, one when the turbo speed is supposed to be low and another when the turbo speed is supposed to be high.
Group 28 Crankshaft Position Sensor: Rationality Monitors Crankshaft Position Sensor: Rationality Monitors The Crankshaft Position Sensor is monitored by comparing it’s output signal to the output signal of the camshaft position sensor.
Group 28 P0336 Crankshaft Position Sensor: Rationality High P0336 Crankshaft Position Sensor: Rationality High DTC P0336 Component / System Crankshaft Position Sensor - Rationality High Monitor Strategy Description Input Rationality - High Fault Limit More crank teeth than expected More crank teeth for number of revolutions greater than 3 Enable Conditions • Disable Conditions No Active DTC's: • Engine Speed > 50 RPM N/A Time Required For DTC To Be Set 5 seconds MIL Illumination 2 Drive
Group 28 Camshaft Position Sensor: Rationality Monitors Camshaft Position Sensor: Rationality Monitors The camshaft position sensor is monitored by comparing its output signal to the output signal of the crankshaft position sensor.
Group 28 P0341 Camshaft Position Sensor: Rationality High P0341 Camshaft Position Sensor: Rationality High DTC P0341 Component / System Camshaft Position Sensor - Rationality High Monitor Strategy Description Input Rationality - High Fault Limit More cam teeth than expected More cam teeth for number of revolutions greater than 3 Enable Conditions • Disable Conditions No Active DTC's: • Engine Speed > 50 RPM N/A Time Required For DTC To Be Set 5 seconds MIL Illumination 2 Drive Cycles Pr
Group 28 Aftertreatment Hydrocarbon Injection System Aftertreatment Hydrocarbon Injection System The exhaust aftertreatment fuel injection system injects diesel fuel into the exhaust stream to increase the exhaust gas temperature during some operating conditions This OBD monitor identifies malfunctions of the Aftertreatment Hydrocarbon Doser System by analyzing the fuel pressures during an OBD controlled sequence of the fuel cut-off valve (FCV), the air purge valve (APV) and the fuel dosing valve (FDV).
Aftertreatment Hydrocarbon Doser Fuel Pressure Sensor: Circuit Monitors Group 28 Aftertreatment Hydrocarbon Doser Fuel Pressure Sensor: Circuit Monitors The fuel doser pressure sensor is monitored to check for electrical failures by monitoring the analog-to-digital (A/D) input voltages. P20DD Aftertreatment Hydrocarbon Doser Fuel Pressure Sensor: Open Circuit DTC P20DD Component / System Fuel Pressure Sensor - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage < 0.
Aftertreatment Hydrocarbon Doser Solenoid: Rationality Monitors Group 28 Aftertreatment Hydrocarbon Doser Solenoid: Rationality Monitors P20DC Aftertreatment Hydrocarbon Doser Solenoid: Plausibility Low DTC P20DC Component / System Doser Solenoid - Plausibility Low Monitor Strategy Description System Pressure with Valve Commanded Closed (FP Failed) Fault Limit Closed Valve system pressure < 100 kPa Enable Conditions • • • Disable Conditions Engine Speed 550 RPM Coolant Temperature 20 °C DOC Out
Group 28 Aftertreatment Hydrocarbon Doser Solenoid: Circuit Monitors Aftertreatment Hydrocarbon Doser Solenoid: Circuit Monitors The fuel doser solenoid is checked for electrical failures. P20D7 Aftertreatment Hydrocarbon Doser Solenoid: Open Circuit DTC P20D7 Component / System Doser Solenoid - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Current < 0.
Aftertreatment Hydrocarbon Air Purge Valve: Rationality Monitors Group 28 Aftertreatment Hydrocarbon Air Purge Valve: Rationality Monitors P1133 Aftertreatment Hydrocarbon Air Purge Valve: Stuck Open DTC P1133 Component / System Air Purge Valve - Stuck Open Monitor Strategy Description System Pressure with Valve Commanded Closed (LP Failed) Fault Limit Closed Valve system pressure < 50 kPa Enable Conditions • • • Disable Conditions Engine Speed 550 RPM Coolant Temperature 20 °C DOC Out Temperat
Group 28 Aftertreatment Hydrocarbon Air Purge Valve: Circuit Monitors Aftertreatment Hydrocarbon Air Purge Valve: Circuit Monitors The fuel air purge valve is checked for electrical failures. P1134 Aftertreatment Hydrocarbon Air Purge Valve: Open Circuit DTC P1134 Component / System Air Purge Valve - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Current < 0.
Aftertreatment Hydrocarbon Dosing Valve: Rationality Monitors Group 28 Aftertreatment Hydrocarbon Dosing Valve: Rationality Monitors P20CF Aftertreatment Hydrocarbon Dosing Valve: Stuck Open DTC P20CF Component / System Aftertreatment Hydrocarbon Dosing Valve - Stuck Open Monitor Strategy Description System Pressure With Valve Commanded Closed (FL Failed) Fault Limit Closed Valve system pressure < 75 kPa Enable Conditions • • • Disable Conditions Engine Speed 550 RPM Coolant Temperature 20 °C D
Group 28 Aftertreatment Hydrocarbon Dosing Valve: Circuit Monitors Aftertreatment Hydrocarbon Dosing Valve: Circuit Monitors The fuel doser is checked for electrical failures. P2697 Aftertreatment Hydrocarbon Dosing Valve: Open Circuit DTC P2697 Component / System Aftertreatment Hydrocarbon Dosing Valve - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Current < 0.
Aftertreatment DEF Tank Temperature Sensor: Rationality Monitors Group 28 Aftertreatment DEF Tank Temperature Sensor: Rationality Monitors The DEF tank temperature sensor is checked for rational values. When heating the DEF tank by activating the coolant valve, the DEF tank temperature sensor value is expected to increase within the evaluation time.
Aftertreatment DEF Tank Temperature Sensor: Circuit Monitors Group 28 Aftertreatment DEF Tank Temperature Sensor: Circuit Monitors The DEF tank temperature sensor is checked for electrical failures. P205A Aftertreatment DEF Tank Temperature Sensor: Open Circuit DTC P205A Component / System Temperature Sensor - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 4.
Group 28 Aftertreatment DEF Pump: Rationality Monitors Aftertreatment DEF Pump: Rationality Monitors The Aftertreatment DEF pump has internal diagnostics which evaluate whether the DEF pump is able to meet its demand. If the pump reports insufficient performance for more than a threshold time then a DTC is set.
Group 28 Aftertreatment DEF Pump: Circuit Monitors Aftertreatment DEF Pump: Circuit Monitors The Aftertreatment DEF Pump is checked for electrical failures. P208A Aftertreatment DEF Pump: Open Circuit DTC P208A Component / System DEF Pump - Open Monitor Strategy Description Open Circuit Fault Limit Pump Voltage < 3.
Group 28 P208C Aftertreatment DEF Pump: Short Circuit Low P208C Aftertreatment DEF Pump: Short Circuit Low DTC P208C Component / System DEF Pump - Low Monitor Strategy Description Short Circuit Low Fault Limit Pump Voltage < 1.
Group 28 Aftertreatment DEF Pump Direction Valve: Rationality Monitor Aftertreatment DEF Pump Direction Valve: Rationality Monitor After the ignition key is turned to the OFF position the aftertreatment control module (ACM) commands the aftertreatment diesel exhaust fluid (DEF) direction valve ON by grounding the control wire (-).
Group 28 Aftertreatment DEF Pump Direction Valve: Circuit Monitors Aftertreatment DEF Pump Direction Valve: Circuit Monitors The Aftertreatment DEF Pump is checked for electrical failures. P20A0 Aftertreatment DEF Pump Direction Valve: Open Circuit DTC P20A0 Component / System Direction Valve - Open Monitor Strategy Description Open Circuit Fault Limit Valve Voltage < 3.
P20A2 Aftertreatment DEF Pump Direction Valve: Short Circuit Low Group 28 P20A2 Aftertreatment DEF Pump Direction Valve: Short Circuit Low DTC P20A2 Component / System Direction Valve - Low Monitor Strategy Description Short Circuit Low Fault Limit Pump Voltage < 1.
Aftertreatment DEF Pump Pressure Sensor: Rationality Monitor Group 28 Aftertreatment DEF Pump Pressure Sensor: Rationality Monitor DEF pressure is compared with the expected value when the DEF pump is in initial pressure build-up mode or if the DEF pressure is above expected value when DEF pump is in idle speed mode.
Group 28 Aftertreatment DEF Pump Pressure Sensor: Circuit Monitors Aftertreatment DEF Pump Pressure Sensor: Circuit Monitors The Aftertreatment DEF Pump Pressure Sensor is checked for electrical failures. P204A Aftertreatment DEF Pump Pressure Sensor: Open Circuit DTC P204A Component / System Pump Sensor - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 4.
Group 28 Aftertreatment SCR Dosing Valve: Rationality Monitor Aftertreatment SCR Dosing Valve: Rationality Monitor During reverse DEF flow conditions on a pressurized selective catalytic reduction (SCR) system, pressure drop is evaluated. If DEF pressure drop is too low, the aftertreatment DEF direction valve is considered to have a mechanical fault (blocked or stuck).
Group 28 Aftertreatment SCR Dosing Valve: Circuit Monitors Aftertreatment SCR Dosing Valve: Circuit Monitors The Aftertreatment SCR Dosing Valve is checked for electrical failures. P2047 Aftertreatment SCR Dosing Valve: Open Circuit DTC P2047 Component / System SCR Dosing Valve - Open Monitor Strategy Description Open Circuit Fault Limit Dosing Valve Current < 0.
Group 28 P2048 Aftertreatment SCR Dosing Valve: Short Circuit Low P2048 Aftertreatment SCR Dosing Valve: Short Circuit Low DTC P2048 Component / System SCR Dosing Valve - Low Monitor Strategy Description Short Circuit Low Fault Limit Dosing Valve Current < 0.
Group 28 VGT Position Actuator: Electrical Check VGT Position Actuator: Electrical Check The VGT actuator is a Smart Remote Actuator and it has both a rationality check and an electrical monitor. The rationality monitor covers detection of mechanical faults of the actuator, a bad device and a missing signal from the actuator. The electrical check monitors the VGT supply voltage. Internal Error (Bad Device): No valid actuator command transmitted for longer than a calibrated period of time.
Group 28 U010C VGT Position Actuator: Missing Signal U010C VGT Position Actuator: Missing Signal DTC U010C Component / System Actuator Missing Signal Monitor Strategy Description VGT Actuator Communication Fault Limit Missing communication from VGT SRA Enable Conditions • • Disable Conditions Ignition Active Battery Voltage > 8 V No Active DTC's: • U0080 Time Required For DTC To Be Set 2 seconds MIL Illumination 2 Drive Cycles Probable Causes See Tech Tool 119
Group 28 VGT Position Actuator: Circuit Monitors VGT Position Actuator: Circuit Monitors The electrical check monitors the VGT supply voltage and if the supply voltage is below the threshold value a DTC is set.
Group 28 EGR Valve Actuator: Circuit Monitors EGR Valve Actuator: Circuit Monitors The EGR valve actuator is checked for electrical circuit checks by monitoring the current. P0403 EGR Valve Actuator: Open Circuit DTC P0403 Component / System Actuator - Open Monitor Strategy Description Open Circuit Fault Limit Valve Current < 0.
Group 28 Engine Fuel Injectors: Injectors 1 through 6: Circuit Monitors Engine Fuel Injectors: Injectors 1 through 6: Circuit Monitors The injection diagnostic function monitors that current level reaches specified levels, defined by the supplier, within the correct time span, typically specified with a minimum time and a maximum time. The evaluation of the current is made for every injection pulse and throughout the complete pulse.
Group 28 P0268 Engine Fuel Injectors: Short Circuit High (Injector 3) P0268 Engine Fuel Injectors: Short Circuit High (Injector 3) DTC P0268 Component / System Injector 3 - High Monitor Strategy Description Short Circuit High Fault Limit • • • • Enable Conditions Disable Conditions Injector current outside of valid peak event > 9 A Number of injections with SCH detected > 3 Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 2 seconds MIL Illumination
Group 28 P0274 Engine Fuel Injectors: Short Circuit High (Injector 5) P0274 Engine Fuel Injectors: Short Circuit High (Injector 5) DTC P0274 Component / System Injector 5 - High Monitor Strategy Description Short Circuit High Fault Limit • • • • Enable Conditions Disable Conditions Injector current outside of valid peak event > 9 A Number of injections with SCH detected > 3 Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 2 seconds MIL Illumination
Group 28 P0201 Engine Fuel Injectors: Short Circuit Low (Injector 1) P0201 Engine Fuel Injectors: Short Circuit Low (Injector 1) DTC P0201 Component / System Injector 1 - Low Monitor Strategy Description Short Circuit Low Fault Limit • • • • Enable Conditions Disable Conditions Injector current in valid peak event > 9 A Number of injections with SCL detected > 3 Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 2 seconds MIL Illumination 2 Drive Cy
Group 28 P0203 Engine Fuel Injectors: Short Circuit Low (Injector 3) P0203 Engine Fuel Injectors: Short Circuit Low (Injector 3) DTC P0203 Component / System Injector 3 - Low Monitor Strategy Description Short Circuit Low Fault Limit • • • • Enable Conditions Disable Conditions Injector current in valid peak event > 9 A Number of injections with SCL detected > 3 Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 2 seconds MIL Illumination 2 Drive Cy
Group 28 P0205 Engine Fuel Injectors: Short Circuit Low (Injector 5) P0205 Engine Fuel Injectors: Short Circuit Low (Injector 5) DTC P0205 Component / System Injector 5 - Low Monitor Strategy Description Short Circuit Low Fault Limit • • • • Enable Conditions Disable Conditions Injector current in valid peak event > 9 A Number of injections with SCL detected > 3 Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 2 seconds MIL Illumination 2 Drive Cy
Group 28 Ambient Air Temperature Sensor (AAT): Rationality Monitor Ambient Air Temperature Sensor (AAT): Rationality Monitor The rationality monitor for the ambient air temperature sensor monitors for missing signal from the sensor. If the sensor signal is missing for a specified time the rationality DTC is set.
Group 28 Ambient Air Temperature Sensor (AAT): Circuit Monitors Ambient Air Temperature Sensor (AAT): Circuit Monitors The rationality monitor for the ambient air temperature sensor monitors for missing signal from the sensor. If the sensor signal is missing for a specified time the rationality DTC is set. P0070 Ambient Air Temperature Sensor (AAT): Open Circuit DTC P0070 Component / System AAT - Open Monitor Strategy Description Open Circuit Fault Limit Sensor Voltage > 90 °C (4.
Wheel Based Vehicle Speed: Vehicle Speed Sensor (VSS): Rationality Monitor Group 28 Wheel Based Vehicle Speed: Vehicle Speed Sensor (VSS): Rationality Monitor The VECU performs a rationality check on the computed road speed by comparing it with that reported by the ABS. Deviations between signals greater than a pre-set value cause a fault to be reported on the network.
Wheel Based Vehicle Speed: Vehicle Speed Sensor (VSS): Circuit Monitors Group 28 Wheel Based Vehicle Speed: Vehicle Speed Sensor (VSS): Circuit Monitors The VECU performs circuit checks of the sensor when the road speed is zero. P0500 Wheel Based Vehicle Speed: Vehicle Speed Sensor (VSS): Open Circuit DTC P0500 Component / System VSS - Open Monitor Strategy Description Input Open Circuit Fault Limit Sensor Current < 0.
Group 28 Accelerator Pedal Position #1 Sensor: Rationality Monitors Accelerator Pedal Position #1 Sensor: Rationality Monitors The VECU performs diagnostics on the analog voltages read from the Accelerator Pedal Position Sensor and the Idle Validation Switch (IVS). P2109 Accelerator Pedal Position Sensor: Rationality Low DTC P2109 Component / System APP - Rationality Low Monitor Strategy Description Pedal position switch rationality - low Fault Limit Sensor Voltage 0.38 - 0.
Group 28 Accelerator Pedal Position Sensor: Circuit Monitors Accelerator Pedal Position Sensor: Circuit Monitors P0122 Accelerator Pedal Position Sensor: Below Range DTC P0122 Component / System APP - Low Monitor Strategy Description Below range Fault Limit Sensor Voltage < 0.
Group 28 Parking Brake Switch: Electrical Check Parking Brake Switch: Electrical Check P05E4 Parking Brake Switch: Short Circuit Low DTC P05E4 Component / System Parking Brake Switch Monitor Strategy Description Short Circuit Low Fault Limit Sensor Voltage < 0.
Group 28 5 Volt ECM Supply: Supply #1 5 Volt ECM Supply: Supply #1 The 5 Volt sensor supplies are is located in the Engine Electronic Control Unit (EECU). Some sensors, especially pressure sensors, require 5 Volt supply to operate. They are fed by three 5 Volt supplies in the EECU (referred as #1, #2 and #3 below). If the 5 Volt supply fails or the feed is shorted to ground or battery the above/below range monitoring reports this.
Group 28 5 Volt ECM Supply: Supply #2 5 Volt ECM Supply: Supply #2 P06B4 ECM Supply #2: Below Range DTC P06B4 Component / System ECM Supply #2 Monitor Strategy Description Below range Fault Limit Voltage Sensed < 4.
Group 28 5 Volt ECM Supply: Supply #3 5 Volt ECM Supply: Supply #3 P06E7 ECM Supply #3: Below Range DTC P06E7 Component / System ECM Supply #3 Monitor Strategy Description Below range Fault Limit Voltage Sensed < 4.
Group 28 Data Link Communication: CAN Links Data Link Communication: CAN Links The Engine ECU software monitors CAN messages received by the Engine ECU for detection of lost data link communication to other ECU’s. In addition, the ECU monitors the electrical behavior of the data buses. It cannot detect electrical failures, but “bus off” conditions, where it is not possible to send data. The bus off conditions are monitored and a fault code set if such a condition occurs on any of the datalinks.
Group 28 U0080 CAN Link: Powertrain CAN Missing Signal U0080 CAN Link: Powertrain CAN Missing Signal DTC U0080 Component / System SAE J1939 Datalink # 2 (Powertrain) Monitor Strategy Description Missing Signal Fault Limit Time Missing Signal > 5 seconds Enable Conditions • • Disable Conditions Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 5 seconds MIL Illumination 1 Drive Cycle Probable Causes See Tech Tool U116F CAN Link: Missing ACM at E
Group 28 U0141 CAN Link: Missing Signal from the VECU U0141 CAN Link: Missing Signal from the VECU DTC U0141 Component / System VECU Monitor Strategy Description Missing Signal Fault Limit Time Missing Signal > 9 seconds Enable Conditions • • Disable Conditions Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 5 seconds MIL Illumination 2 Drive Cycles Probable Causes See Tech Tool U0001 CAN Link: Missing Signal on Backbone 2 DTC U0001 Compone
Group 28 Idle Engine Speed: Idle Engine Speed Rationality Idle Engine Speed: Idle Engine Speed Rationality Idle speed target can be between 550 to 700 rpm. When engine is in idle governor mode fueling is controlled to get target idle speed. If it is not able to control the engine speed above 525 rpm an idle speed low fault code is logged.
Group 28 P0507 Idle Engine Speed Rationality: Idle Speed High P0507 Idle Engine Speed Rationality: Idle Speed High DTC P0507 Component / System Idle speed - Rationality High Monitor Strategy Description Flywheel based idle speed validation Fault Limit Idle Speed > 725 RPM Enable Conditions • • • • • • • • • Disable Conditions Vehicle Speed < 0.1 km/h PTO Not Active Engine Torque < 400 Nm Acceleration Pedal Position < 0.
Group 28 Idle Engine Speed: Idle Engine Fuel Rationality Idle Engine Speed: Idle Engine Fuel Rationality Fuel Rationality Low: Nominal idle fuel rate (based on engineering analysis) can be as low as 10mm3/stroke and as high as 100mm3/stroke due to various installation differences and activations of various features (AC, air compressor, alternator etc). Diagnostics is set up to detect 50% lower than the lowest possible idle fuel rates.
Group 28 P054F Idle Engine Fuel Rationality: Fuel Rationality High P054F Idle Engine Fuel Rationality: Fuel Rationality High DTC P054F Component / System Idle speed - Fuel Rationality high Monitor Strategy Description High fuel validation at idle Fault Limit Idle Fuel > 150mm3 stroke Enable Conditions • • • • • • • • • Disable Conditions Vehicle Speed < 0.1 km/h PTO Not Active Engine Torque < 400 Nm Acceleration Pedal Position < 0.
Group 28 Idle Validation Switch (IVS): Rationality Monitor Idle Validation Switch (IVS): Rationality Monitor P2136 Idle Validation Switch (IVS): IVS Does Not Match Accelerator Pedal Position DTC P2136 Component / System IVS - Rationaliy Monitor Strategy Description IVS Does Not Match Accelerator Pedal Position Fault Limit Voltage > 6 V Enable Conditions • • Disable Conditions Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set Continuous MIL Illumina
Group 28 Idle Validation Switch (IVS): Circuit Monitor Idle Validation Switch (IVS): Circuit Monitor P0652 Idle Validation Switch (IVS): Short Circuit Low DTC P0652 Component / System IVS - Low Monitor Strategy Description Short Circuit Low Fault Limit Voltage < 0.
Group 28 5 Volt ACM Sensor Supply: Supply #1 5 Volt ACM Sensor Supply: Supply #1 The 5 Volt sensor supplies are located in the Aftertreatment Control Module (ACM). Some sensors require a 5 Volt supply to operate. They are fed by two 5 Volt supplies in the ACM (referred as #1 and #2 below). If the 5 Volt supply fails or is shorted the above/below range monitoring reports.
Group 28 5 Volt ACM Sensor Supply: Supply #2 5 Volt ACM Sensor Supply: Supply #2 P06B4 ACM Sensor Supply #2: Below Range DTC P06B4 Component / System ACM Sensor Supply #2 Monitor Strategy Description Below range Fault Limit Voltage Sensed < 4.
Group 28 Actuator Supply #1 ACM: Circuit Monitors Actuator Supply #1 ACM: Circuit Monitors P0657 Actuator Supply #1 ACM: Open Circuit DTC P0657 Component / System Actuator Supply #1 ACM - Open Monitor Strategy Description Open Circuit Fault Limit Voltage Supply < 2V Enable Conditions • • Disable Conditions Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 5 seconds MIL Illumination 2 Drive Cycles Probable Causes See Tech Tool P0658 Actuator Sup
Group 28 P0659 Actuator Supply #1 ACM: Short Circuit High P0659 Actuator Supply #1 ACM: Short Circuit High DTC P0659 Component / System Actuator Supply #1 ACM - High Monitor Strategy Description Short Circuit High Fault Limit Current Supply > 18 A Enable Conditions • • Disable Conditions Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 5 seconds MIL Illumination 2 Drive Cycles Probable Causes See Tech Tool Actuator Supply #2 ACM: Circuit Monit
Group 28 P1095 Actuator Supply #2 ACM: Short Circuit Low P1095 Actuator Supply #2 ACM: Short Circuit Low DTC P1095 Component / System Actuator Supply #2 ACM - Low Monitor Strategy Description Short Circuit Low Fault Limit Voltage Supply < 8 V Enable Conditions • • Disable Conditions Key On Active Battery Voltage > 8 V No Active DTC's: • N/A Time Required For DTC To Be Set 5 seconds MIL Illumination 2 Drive Cycles Probable Causes See Tech Tool P1096 Actuator Supply #2 ACM: Short Circui
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