User manual

15
On-Board Diagnostics (OBD) Diagnostic Services Introduction
NOTE:
i Not all data is applicable or supported by all vehicles.
Each vehicle manufacturer has unique monitor test criteria. The Readiness Test Status indicates
whether a particular diagnostic monitor or function passed its specific test criteria and was found
to be within specification.
Usually the monitors should run and set the Readiness Test Status during normal vehicle
operation. The OBD-II Drive Cycle (see Figure 4-1: ‘Typical OBD-II Drive Cycle’) can be used to
drive the vehicle in a prescribed manner.
Figure 4-1
Typical OBD-II Drive Cycle
As this is a generic drive cycle, it may have limited results on some vehicles. If available, use the
drive cycle information as supplied by the vehicle manufacturer.
System malfunctions that occur later and record a DTC (Diagnostic Trouble Code) will not change
the Readiness Test Status. When the failure is repaired and the DTC is erased, all Readiness Test
Status will be reset to a ‘Not Completed’ status.
Catalyst monitoring †
Heated catalyst monitoring †
Evaporative system monitoring †
Secondary air system monitoring †
A/C system refrigerant monitoring †
Oxygen sensor monitoring †
Oxygen sensor heater monitoring †
EGR system monitoring †
Table 4-2 Continuous or Non-continuous monitors (sheet 2 of 2)
Readiness Monitor Remark
† Will only be monitored if the correct conditions are met.
Idle 2.5 Minutes
in Drive, A/C &
Rear Defrost ON
Cold Start
ECT < 50C
Accelerate at 50%
Throttle to 55 mph/
89 kph A/C OFF
3 Minutes
5 Minutes
Steady State Cruise
55 mph/89 kph
Decelerate to
20 mph/32 kph
with the Clutch
Engaged and
No Brakes
Accelerate at
75% Throttle to
55 to 60 mph/
89 to 97 kph
Steady State Cruise
55 to 60 mph/
89 to 97 kph
Decelerate to
End of Cycle
Without Brakes
HO2 Heater, Misfire, AIR, Fuel Trim, and Purge Monitors Misfire, Fuel Trim, and Purge Monitors Misfire, EGR, AIR, Fuel Trim, HO2, and Purge Monitors EGR, Fuel Trim, and Purge Monitors Misfire, Fuel Trim, and Purge Monitors Catalyst, Misfire, EGR, Fuel Trim, HO2, and Purge Monitors EGR, and Purge Monitors
Total Time 12 Minutes