CP9025 TM Congratulations on purchasing your Actron Code Scanner for accessing engine trouble codes required for repairing vehicles equipped with computers. Your Actron Code Scanner is made by Actron, the largest and most trusted name in automotive diagnostic equipment for the home mechanic. You can have confidence this product maintains the highest quality in manufacturing, and will provide you years of reliable service. This instruction manual is divided into several key sections.
General Safety Guidelines to follow when working on vehicles • Always wear approved eye protection. • Always operate the vehicle in a well ventilated area. Do not inhale exhaust gases – they are very poisonous! • Always keep yourself, tools and test equipment away from all moving or hot engine parts. • Always make sure the vehicle is in park (Automatic transmission) or neutral (manual transmission) and that the parking brake is firmly set. Block the drive wheels.
About Codes Where do they come from and what are they for? Engine computers can find problems Read Codes with the Code Scanner The computer system in today’s vehicles does more than control engine operation - it can help you find problems, too! Special testing abilities are permanently programmed into the computer by factory engineers. These tests check the components connected to the computer which are used for (typically): fuel delivery, idle speed control, spark timing and emission systems.
Vehicle Service Info The following is a list of publishers who have service manuals for your specific vehicle. Write or call them for availability and prices, specifying the make, style, model year, and VIN (Vehicle Identification Number) of your vehicle.
When to Read Codes Use the Code Scanner to read computer trouble codes if... • The “Check Engine” light comes ON or, • Vehicle engine is running poorly (for vehicles without a “CHECK ENGINE” LIGHT. The Check Engine light The “CHECK” engine dashboard light tells you when to use the Code Scanner tool. The light may be colored amber or red, labeled with a small engine picture, called “CHECK ENGINE”, “PGM-FI”, or “PGM-CARB” on some vehicles.
running poorly, problems in the computer system MAY be the cause. See if any of the following symptoms apply to your vehicle.
Using Codes Using Trouble Codes to Pinpoint Problems There are two types of codes • “Hard” codes - codes for problems which are present now. “Hard” problems make the “Check Engine” light come on and stay on. A trouble code is stored in computer memory. The light will stay on as long as the problem is present. • “Intermittent” codes - codes for problems which happened in the past, but are not happening now.
• Inspect all vacuum hoses for: –Correct routing. Refer YST to vehicle service G GAP manual, or Vehicle U.S.A. Emission Control Information(VECI) decal located in the engine compartment. –Pinches and kinks. –Splits, cuts or breaks. HVAC CRUISE CE BOOSTER EM EGR VAC REG BRAKE BOOSTER FUEL PRESS REG. • Inspect wiring for: –Contact with sharp edges. (This happens often.) –Contact with hot surfaces, such as exhaust manifolds. –Pinched, burned or chafed insulation. –Proper routing and connections.
Vehicle Preparation Important: Complete ALL steps in this section before proceeding to Section 5, “Reading Trouble Codes.” (Exception: Vehicles with Super Monitor Display – Do steps 1 through 6 only.) 1) Safety First! • Set the parking brake. • Put the shift lever in PARK or Neutral. • Block the drive wheels. • Make sure the ignition key is in the OFF position. 2) Vehicle Engine Must be at Normal Operating Temperature.
ized Engine Controls”, “Electronic Engine Controls” or “Tune-Up Information.” • Turn the ignition key OFF. 8) Find the Computer Test Connector Referred to as the “CHECK” connector, the “CHECK ENGINE” connector, the “ENGINE CHECK” connector, the “EFI” connector, or the “SERVICE” connector. There are 2 types... • Circular plastic: This is usually bright yellow (or green), with 2 contacts. It is located in the engine compartment.
Reading Codes Important: Complete ALL steps in Section 4, “Vehicle Preparation” before reading trouble codes. Toyota uses various computerized engine control systems. • Trouble codes are read by counting flashes on the “CHECK” engine light (or using the Super Monitor Display). • Use the chart below to find the code reading test procedure for your vehicle. * Vehicle must have Super Monitor Display Year Usage System Test Pg.
EFI System (Electronic Fuel Injection system) 1) Complete ALL steps in Section 4, “Vehicle Preparation” 2) Access Computer Test Connector Rectangular type: • Open hinged cover on connector. • Some connectors use a special grease on the contacts to prevent corrosion. Do not wipe off! Circular type: • Remove the protective rubber cap from the connector.
• After all trouble codes have been written down, finish testing as follows: 6) Turn ignition key OFF 7) Remove Tool from Connector and Replace Connector’s Protective Cover • The engine computer is now back to normal. TEST RESULTS COMMENTS No indication on “CHECK” engine light You have a problem with the diagnostic circuit which needs repair before using the code scanner tools. Refer to vehicle service manual. Code 1 only Computer does NOT find a problem.
TCCS-E (Toyota Computer Control System - Early version) 1) Complete ALL steps in Section 4, “Vehicle Preparation” 2) Access Computer Test Connector Rectangular type: • Open hinged cover on connector. • Some connectors use a special grease on the contacts to prevent corrosion. Do not wipe off! Circular type: • Remove the protective rubber cap from the connector.
Example of code series 3 and 5: ❊ ❊ PAUSE 7) Remove Tool from Connector and Replace Connector’s Protective Cover • The engine computer is now back to normal. ❊ PAUSE FLASH - FLASH - FLASH (4.5 second pause) ❊ ❊ PAUSE ❊ PAUSE ❊ PAUSE Replace cap ❊ PAUSE FLASH - FLASH - FLASH - FLASH - FLASH (4.
Erasing Trouble Codes after Repair • Remove the indicated fuse for a minimum of 30 seconds. 30 SECONDS – Corolla GT-S (RWD), 1985 Celica, MR2, 1986 MR2 & 1987 Corolla FX-16 (FWD): Remove the “STOP” 15 amp fuse from the fuse block. – 1985 Corolla (RWD) & 1987 MR2: Remove the “AM2” 7.5 amp fuse from the fuse block. – Camry, Celica, Pickup, Van, & 4Runner: Remove the “EFI” 15 amp fuse from the fuse block. • All the trouble codes are now erased from computer memory! • Replace fuse.
TCCS-L (Toyota Computer Control System - Later version) 1) Complete ALL steps in Section 4, “Vehicle Preparation” 2) Access Computer Test Connector Rectangular type: • Open hinged cover on connector. • Some connectors use a special grease on the contacts to prevent corrosion. Do not wipe off! Circular type: • Remove the protective rubber cap from the connector. ON OFF 3) Turn ignition Key to ON Position but DO NOT START THE ENGINE.
Example of code series 11, 13 and 23: ❊ O ❊ 6) Turn ignition key OFF PAUSE FLASH (pause) FLASH (2.5 second pause, then go to next code) ❊ PAUSE ❊❊❊ FLASH (pause) FLASH FLASH FLASH (2.5 second pause, then go to next code) ❊❊ PAUSE FF ON 7) Remove Tool from Connector and Replace Connector’s Protective Cover • The engine computer is now back to normal. Replace cap ❊❊❊ FLASH FLASH (pause) FLASH FLASH FLASH (4.
What to do with the Trouble Codes Erasing Trouble Codes after Repair Look up the code definitions listed in “Toyota Code Meanings.” • Remove the indicated fuse for a minimum of 30 seconds. At this point you can either: • Have your vehicle professionally serviced. Trouble codes indicate problems found by the computer. or, • Repair the vehicle yourself using trouble codes to help pinpoint the problem. Refer to Section 3, “Using Codes.
TCCS-M (Toyota Computer Control System with Super Monitor Display option) 1) Complete Steps 1 Through 5 in Section 4, “Vehicle Preparation” ON OFF Example of code 32: Display will show “E/G 32” or “ENG -32”. • All codes are 2 digits long. • When M H more than INPUT SELECT SET SUPER MONITOR 1 code is stored, there will be a 3 second pause between codes.
TEST RESULTS COMMENTS No indication on Super Monitor Display You have a problem with the Super Monitor Display which needs repair before reading codes. Refer to vehicle service manual. E/G OK or ENG-OK Computer does NOT find a problem. If drive symptom persists, be sure to perform a thorough underhood inspection first. (Refer to page 7.) Then refer to vehicle service manual for troubleshooting suggestions. Any code(s) Computer found problems in vehicle. Refer to “Toyota Code Meanings.”, page 22.
Code Meanings Note: • Code meanings can vary with vehicle, model year, engine type and options. • If a code number has more than one definition listed, note that only one definition applies to your vehicle. Consult service manual to get the specific definition for your vehicle. • Each code definition includes a list of possible causes for the code. • Follow vehicle service manual procedures to find the cause of the code.
EFI Codes Electronic Fuel Injection system 1 System Normal No malfunction. 5 Airflow meter (AFM) - Bad Airflow meter or meter wiring. Oxygen (O2) sensor signal - Air suction into Exhaust system. Leak in Air Induction system or Air Intake system. Bad or fouled Spark Plug(s). Bad Vacuum sensor, O2 sensor(s), O2 sensor Heater, Integrated Ignition Assembly (IIA), Air Flow meter, Fuel Injector(s), Cold Start Injector or Cam Position sensor. Improper Fuel pressure. Faulty Ignition system, Distributor.
TCCS-E Codes Toyota Computer Control System (Early version) 1 System Normal - No malfunction. 2 Airflow meter (AFM) signal - Bad Airflow meter, Main relay, EFI Main relay, or faulty meter/relay wiring. 3 Ignition signal - Bad Igniter, Ignition coil, Ignition switch, Cam Position sensor, Ignition Main relay, Integrated Ignition Assembly (IIA), Cam Position sensor or Distributor. Wiring associated with these parts.
TCCS-L Codes Toyota Computer Control System (Later version) and TCCS-M Codes Toyota Computer Control System with Super Monitor Display option 11 Electronic Control Unit (ECU) Power supply (B+) Bad Electronic Fuel Injection (EFI) relay, EFI Main relay, Main relay, Ignition switch or faulty relay/switch wiring. or , Main Relay & circuit - Bad Main relay, Electronic Fuel Injection (EFI) Main relay, Ignition switch or faulty relay/switch wiring.
Injector circuit, Ignition system, Air Intake system, Exhaust Gas Recirculation (EGR) system, EGR Vacuum lines or Engine ground. Wiring associated with these parts. or, Oxygen (O2) sensor circuit - Bad or blocked Fuel Injector(s). Leak in Air Induction system. Bad Air Flow meter, O2 sensor or Spark Plug(s). Improper Fuel line pressure. Faulty Ignition system or Distributor. Wiring associated with these parts.
51 Switch Condition - Bad Air Conditioning (A/C) switch, A/ C Amplifier, Neutral/Start switch, Throttle Position sensor, Accelerator pedal or Accelerator pedal cable. Wiring associated with these parts. or , Switch signal - Bad Air Conditioning (A/C) switch or A/C Amplifier, Neutral/Start switch, Throttle Position sensor, Accelerator pedal or Accelerator Pedal cable. Wiring associated with these parts. or , Air Conditioning (A/C) signal - Bad A/C Amplifier or faulty amplifier wiring.
Vehicle Preparation Complete ALL steps in this section before proceeding to Reading Trouble Codes. IMPORTANT: Reading trouble codes on 1985 - 1990 (all models) and 1991 Civic, CRX, & Prelude models, requires access to the engine computer. Due to varying mounting locations and methods, some mechanical disassembly may be required! Refer to the Computer Location table in step 3 below.
4) Access the Computer for Testing 8 4 2 1 • Trouble codes are “read” by noting which LED’s are “ON” (4 LED system) or by observing the flash pattern of a single LED (1 LED system). These LED’s are mounted inside the computer. They can be seen through a “sight window” (an opening in the computer housing) or reflected by a small mirror in some cases. • Remove any vehicle parts such as kick panels or other plastic pieces which would restrict access to the LED sight window.
Reading Codes Important: Complete ALL steps in “Vehicle Preparation” before reading trouble codes. • Honda uses various computerized engine control systems. • Trouble codes are read by: – Observing LED’s (Light Emitting Diodes) built into the engine computer OR... – Counting flashes on the “CHECK” engine light. • Use the chart below to find the code reading test procedure for your vehicle.
SPECIAL NOTE: Vehicles With Electronically Controlled Automatic Transaxles • Some vehicles have computer controlled automatic transaxles (transmissions). • Typically these transmissions are selfdiagnosing, similar to the engine control systems covered in this section. • Note that certain engine control system failures may also cause the “S”, “D”, or “D4” transmission indicator lamp to flash along with the “CHECK” Engine lamp.
1985 Accord SEi, Civic CRX Si 1986 Civic CRX Si, Civic Si 1987 Civic CRX Si, Civic Si Preliminary Checks Each LED has a numeric value. • The left LED has a value of 8. • The next LED in line has a value of 4. • The next LED in line has a value of 2. • The right LED has a value of 1. Add values of the lighted LED’s to get the Trouble Code. (Off LED’s have a value of zero.) Honda service manuals list several checks which should be made before reading trouble codes.
5) Write down all displayed Trouble Codes. 6) To view codes a second time, turn the ignition key OFF and then back to the ON position. O 7) This completes trouble code retrieval on these vehicles. Turn the ignition key OFF. (The FF ON engine computer is back to normal operation.) What to do with the Trouble Codes Look up the code definitions listed in Section 9, “Honda Code Meanings.” At this point you can either: • Have your vehicle professionally serviced.
1986 1987 1988 1989 1990 1991 Accord LXi, Prelude (Fuel Injected only) Accord LXi, Prelude (Fuel Injected only) All models except carbureted Accord All models except carbureted Accord All models All models except Accord (any) and Prelude with 2.1 Liter engine Preliminary Checks Honda service manuals list several checks which should be made before reading trouble codes. Problems in the areas listed below can cause the computer to set false or misleading codes.
Multiple Codes... • Depending upon system, trouble codes are repeated 2 or 3 times in succession. ❊ Example: Code 12 Sent as... ❊ PAUSE ❊❊ PAUSE ❊ Example: Codes 13 and 21 occur at same time. (Same failure may have caused both codes.) Sent as... PAUSE ❊❊ PAUSE ❊❊❊ PAUSE ❊❊ PAUSE ❊ PAUSE ❊ PAUSE ❊❊❊ PAUSE or ❊ PAUSE ❊❊ PAUSE ❊ PAUSE ❊❊ PAUSE ❊ PAUSE ❊❊ • Several different codes can be stored if the computer sees more than one problem.
Erasing Trouble Codes after Repair Look up the code definitions listed in Section 9, “Honda Code Meanings.” At this point you can either: • Have your vehicle professionally serviced. Trouble codes indicate problems found by the computer. or, • Repair the vehicle yourself using trouble codes to help pinpoint the problem. Refer to Section 3, “Using Codes.” Be sure to erase any trouble codes from the computer’s memory after repairs are completed, as follows.
1991 Accord (all) 1991 Prelude with 2.1L engine 1992 All models 1) Make sure the ignition key is in the OFF position. O Honda service manuals list several checks which should be made before reading trouble codes. Problems in the areas listed below can cause the computer to set false or misleading codes. Ignoring these checks can make you miss the real cause of a code! This can lead to the unnecessary replacement of good parts.
For codes 1 through 10... – Count SHORT flashes to get the code. Example of code 4: ❊❊❊❊ For codes 11 through 99... – Count LONG flashes to get the first digit. – Count SHORT flashes to get the second digit. – Combine digits to get the code. Example of code 12: ❊ PAUSE ❊❊ The pause between the first and second digits is 2 seconds. Remember: – If SHORT flashes come first, the code is 10, or less. – If LONG flashes come first, it is the first digit of a two digit code.
8) To view codes a second time, turn the ignition key OFF and then back to the ON position. O 9) Turn the ignition key OFF and remove the WHITE jumper wire. (The engine computer is back to normal operation.) FF Erasing Trouble Codes after Repair • Verify that the ignition key is in FF ON the OFF position. • Remove the indicated fuse from the fuse block and wait 15 seconds. O 7) Write down all displayed Trouble Codes. ON 15 SECONDS 10)This completes trouble code retrieval on these vehicles.
Code Meanings Note: • Code meanings can vary with vehicle, model year, engine type and options. • If a code number has more than one definition listed, note that only one definition applies to your vehicle. Consult service manual to get the specific definition for your vehicle. • Each code definition includes a list of possible causes for the code. • Follow vehicle service manual procedures to find the cause of the code.
7 Throttle Angle (position) sensor - Bad Throttle Angle (position) sensor. Faulty Automatic Transmission (A/ T) control unit or sensor/ control unit wiring. or , Clutch Switch Signal Manual Transmission (M/ T) - Bad Clutch Switch Control unit or faulty control unit wiring. or , Automatic Transmission (A/T) Shift Position Signal - Faulty control unit or control unit wiring. 8 Top Dead Center (TDC) sensor - Bad TDC sensor or faulty sensor wiring. or , Pulse generator - Bad Pulse generator or faulty wiring.
22 Variable Valve Timing Electronic Control (VTEC) Oil Pressure switch - Bad VTEC Oil Pressure switch, VTEC Spool Valve or faulty switch/valve wiring. 23 Knock sensor - Bad Knock sensor or faulty sensor wiring. 30 Automatic Transmission (A/T) “A” signal - Faulty signal wiring. or, A/T FI Signal A - Faulty signal wiring. 41 Oxygen (O2) sensor heater - Bad Oxygen sensor or faulty sensor wiring. or, Linear Air/Fuel Ratio (LAF) sensor - Bad LAF sensor or faulty sensor wiring.
Vehicle Preparation Complete ALL steps in this section before proceeding to Reading Trouble Codes, page 46 IMPORTANT: Reading trouble codes on Nissan vehicles requires access to the engine computer. Due to varying mounting locations and methods, some mechanical disassembly may be required! Refer to the Computer Location table in step 3 (see page 44). If you are unfamiliar or uncomfortable with the disassembly required, you may want to get help from another person before proceeding.
3) Locate the Engine Computer Note: Nissan refers to the engine computer as the ECU (Electronic Control Unit).
4) Access the Computer for Testing • Trouble codes are “read” by observing the flash patterns of 1 or 2 LED’s (Light Emitting Diodes) mounted inside the computer. These LED’s can be seen through a “sight window” - an opening in the top or side of the computer housing. • Also mounted in the computer is the test switch or potentiometer which must be operated to start the code reading process.
Reading Codes Important: Complete ALL steps in Vehicle Preparation before reading trouble codes. Nissan uses several engine computer systems and trouble code reading procedures. • Trouble codes are obtained by counting LED (Light Emitting Diode) flashes. • The LED’s are built into the computer – there may be 1 or 2 LED’s used. • Refer to chart on next page for your vehicle. 1) Find the number of LED’s used. 2) Read the procedure for counting flashes, page 48.
Test Pg.
2 LED System 1 LED System How to Count Flashes to get Trouble Codes How to Count Flashes to get Trouble Codes This system uses a RED and a GREEN LED. This system uses a single RED LED. • The LED blinks long flashes and short flashes. –The duration of the LONG flash is .6 seconds. –The duration of the SHORT flash is .3 seconds. • All Nissan trouble codes are 2 digits long. –Count LONG flashes to get the first digit. –Count SHORT flashes to get the second digit. –Combine digits to get the code.
NISSAN 49
1984 Stanza 1) Use Selector tool or other means to turn the Diagnosis Mode Selector to the ON position. DIAGNOSTIC IND. CAUTION OFF PLEASE OPERATE WITHIN THIS EXTENT ON ON OFF 2) Turn the ignition switch ON, but DO NOT START THE ENGINE. 3) Check to see that both the RED and GREEN LED’s turn ON and flash at the same time: • If they do, proceed to the next step. • If they do not, the computer (ECU) may be defective. Refer to vehicle service manual. 4) Depress and release accelerator pedal.
10)Turn the ignition switch OFF. O Erasing Trouble Codes After Repair FF ON 13)Reconnect the ECU’s harness connector. 14)Reconnect the negative (-) battery cable. You may have to reset the vehicle clock, radio stations, etc. 11)Disconnect the negative (-) battery cable. 12)Remove the harness connector SECONDS from the computer (ECU) and wait 15 seconds.
1984 - 85 200SX, 1985 Stanza Warning: Involves running engine. Observe all safety precautions (see page 2). Work in well ventilated area. 7) Depress and release accelerator pedal. 1) Using the Selector Tool or other means, verify that the Diagnosis Mode Selector is in the OFF position. 8) Observe the RED and GREEN LED’s. • Codes 24, and 31 should be displayed. • Note any codes other than 24, and 31. ON OFF 2) Turn the ignition switch ON, but DO NOT START THE ENGINE.
What to do with the Trouble Codes Erasing Trouble Codes after Repair Look up the code definitions listed in Section 12, “Nissan Code Meanings,” At this point you can either: • Have your vehicle professionally serviced. Trouble codes indicate problems found by the computer. or, • Repair the vehicle yourself using trouble codes to help pinpoint the problem. Refer to Section 3, “Using Codes.
1986 Stanza, 200SX Warning: Involves running engine. Observe all safety precautions (see page 2). Work in well ventilated area. 1) Using the Selector Tool or other means, verify that the Diagnosis Mode Selector is in the OFF position. 7) Depress and release accelerator pedal. ON OFF 2) Turn the ignition switch ON, but do not start the engine. • Automatic Transmission vehicles: codes 31, and 32 should be displayed. • Note any codes other than 31, and 32.
15)When all diagnostic procedures are complete, turn the Diagnosis Mode Selector to the OFF position, and the ignition switch to the OFF position. What to do with the Trouble Codes Look up the code definitions listed in Section 12, “Nissan Code Meanings,” At this point you can either: • Have your vehicle professionally serviced. Trouble codes indicate problems found by the computer. or, • Repair the vehicle yourself using trouble codes to help pinpoint the problem. Refer to Section 3, “Using Codes.
1984 200SX Turbo, 300ZX, 300ZX Turbo Warning: Involves running engine. Observe all safety precautions (see page 2). Work in well ventilated area. 5) Turn the Diagnosis Mode Selector fully CLOCKWISE. 1) Mark the initial setting of the Diagnostic Mode Selector on the computer housing. IMPORTANT: The Diagnostic Mode Selector is a potentiometer.
14)(For 300ZX & 300ZX Turbo only. All others go to Step 16). Drive the vehicle at a speed of greater than 6 MPH. Warning: Get the help of another person for this step! 15)Observe the RED and GREEN LED’s. • Code 31 should be displayed. • Note any codes other than 31. 16)Turn the A/C switch from OFF to ON to OFF (if equipped). A/C 17)Observe the RED and GREEN LED’s. • Code 44 should be displayed. • Note any codes other than 44.
1985 Maxima, 300ZX, 300ZX Turbo Warning: Involves running engine. Observe all safety precautions (see page 2). Work in well ventilated area. 5) Turn the Diagnosis Mode Selector fully CLOCKWISE. 1) Mark the initial setting of the Diagnostic Mode Selector on the computer housing. IMPORTANT: The Diagnostic Mode Selector is a potentiometer.
What to do with the Trouble Codes 12)Start the vehicle’s engine. 13)Observe the RED and GREEN LED’s. • On the 300ZX Turbo only, codes 14, and 31 should be displayed. • Note any codes other than 14, and 31. • On all other models code 31 should be displayed. • Note any codes other than 31. 14)(For 300ZX and 300ZX Turbo only. If Maxima, go to Step 16). Drive the vehicle at a speed of greater than 6 MPH.
1985 - 1986 200SX Turbo Warning: Involves running engine. Observe all safety precautions (see page 2). Work in well ventilated area. 5) Turn the Diagnosis Mode Selector fully CLOCKWISE. 1) Mark the initial setting of the Diagnostic Mode Selector on the computer housing. IMPORTANT: The Diagnostic Mode Selector is a potentiometer.
14) When all diagnostic procedures are complete, turn the Diagnosis Mode Selector fully COUNTERCLOCKWISE, then the ignition switch to the OFF position. 15) IMPORTANT: Turn the Diagnosis Mode Selector to its initial position (setting) as marked in Step 1 of the test procedure. ORIGINAL PENCIL MARK What to do with the Trouble Codes Look up the code definitions listed in Section 12, “Nissan Code Meanings,” At this point you can either: • Have your vehicle professionally serviced.
1986 Maxima, 300ZX, 300ZX Turbo Warning: Involves running engine. Observe all safety precautions (see page 2). Work in well ventilated area. 5) Turn the Diagnosis Mode Selector fully CLOCKWISE. 1) Mark the initial setting of the Diagnostic Mode Selector on the computer housing. IMPORTANT: The Diagnostic Mode Selector is a potentiometer.
13)300ZX Turbo only: Move the gear shift lever from Neutral to all other gears and then back to P RN D 2 1 Neutral. 14)Start the vehicle’s engine. 15)Drive the vehicle at a speed of greater than 6 MPH. Warning: Get the help of another person for this step! 16)Turn the A/C switch, and the heater fan switch ON and then back to OFF. A/C 17)Observe the RED and GREEN LED’s. • Code 44 should be displayed. • Note any codes other than 44. 18)This completes trouble code retrieval for 300ZX Turbo.
1986 1/2 Pickup Warning: Involves running engine. Observe all safety precautions (see page 2). Work in well ventilated area. 1) Start the vehicle’s engine and warm it to normal operating temperature. H C 2) Drive the vehicle for about ten minutes after it has fully warmed up. 3) Park the vehicle and turn the ignition switch OFF. 4) Verify that the Diagnosis Mode Selector is in the OFF position. 6) Turn the Diagnosis Mode Selector switch ON. 7) Have your pencil and paper ready.
17)This completes trouble code retrieval for automatic transmission Pickup. Turn the Diagnosis Mode Selector switch OFF, and the ignition switch to the OFF position. Erasing Trouble Codes after Repair OFF 18)Turn the ignition switch to the ON position, but do not start the engine. OFF ON 19)Switch the Diagnosis Mode Selector ON, and wait at least 3 seconds. ON What to do with the Trouble Codes NISSAN OFF 20)Switch the Diagnosis Mode Selector OFF, and wait at least 3 seconds.
1987 1988 1989 1990 All models except Pathfinder, Pickup, Van All models except Pathfinder, Pickup, Van All models except Pathfinder, Pickup All models (including Axxess) except Stanza, Van, 300SX 1991 Maxima, Pathfinder, Pickup 1992 Maxima with VG30E engine, Pathfinder, Pickup Nissan service manuals list several checks which should be made before reading trouble codes. Problems in the areas listed below can cause the computer to set false or misleading codes.
7) Have your pencil and paper ready. 8) Write down all displayed Trouble Codes. F O 15)Allow all stored Trouble Codes to flash. 10)IMPORTANT: Turn the Diagnosis Mode Selector to its initial position (setting) as marked in Step 1 of the test procedure. ORIGINAL PENCIL MARK What to do with the Trouble Codes Look up the code definitions listed in Section 12, “Nissan Code Meanings,” At this point you can either: • Have your vehicle professionally serviced.
Pathfinder, Pickup, Van Pathfinder, Pickup, Van Pathfinder, Pickup Van (not Axxess) Preliminary Checks Nissan service manuals list several checks which should be made before reading trouble codes. Problems in the areas listed below can cause the computer to set false or misleading codes. Ignoring these checks can make you miss the real cause of a code! This can lead to the unnecessary replacement of good parts. Service manual procedures for troubleshooting a code assume all preliminary checks are good.
What to do with the Trouble Codes Erasing Trouble Codes after Repair Look up the code definitions listed in Section 12, “Nissan Code Meanings,” At this point you can either: • Have your vehicle professionally serviced. Trouble codes indicate problems found by the computer. or, • Repair the vehicle yourself using trouble codes to help pinpoint the problem. Refer to Section 3, “Using Codes.
1990 Stanza, 300ZX 1991 NX, Sentra, Stanza, 240SX, 300ZX 1992 Maxima w/VE30DE (DIS) engine, NX, Sentra, Stanza, 240SX, 300ZX Nissan service manuals list several checks which should be made before reading trouble codes. Problems in the areas listed below can cause the computer to set false or misleading codes. Ignoring these checks can make you miss the real cause of a code! This can lead to the unnecessary replacement of good parts.
8) IMPORTANT: Turn the Diagnosis Mode Selector to its initial position (setting) as marked in Step 1 of the test procedure. ORIGINAL PENCIL MARK What to do with the Trouble Codes Look up the code definitions listed in Section 12, “Nissan Code Meanings,” At this point you can either: • Have your vehicle professionally serviced. Trouble codes indicate problems found by the computer. or, • Repair the vehicle yourself using trouble codes to help pinpoint the problem. Refer to Section 3, “Using Codes.
Code Meanings Note: Remember: • Code meanings can vary with vehicle, model year, engine type and options. • If a code number has more than one definition listed, note that only one definition applies to your vehicle. Consult service manual to get the specific definition for your vehicle. • Each code definition includes a list of possible causes for the code. • Follow vehicle service manual procedures to find the cause of the code.
switch, Electronic Fuel Injection (EFI) relay, Electronic Concentrated Control System (ECCS) relay, Main relay or faulty switch/relay wiring. or , Throttle Valve Idle switch Out of adjustment or Bad Throttle Valve Idle switch or faulty switch wiring. 24 Idle switch - Bad or out of adjustment Idle switch, Ignition switch, Throttle Valve switch or faulty switch wiring. or , Transmission switch - Bad Neutral switch or faulty switch wiring.
Computer Basics This section explains the engine computer control system, the types of sensors and how the computer controls fuel delivery, idle speed, spark timing and emission devices. The following is a general introduction to computer controlled engine systems. Additional information may be found in books dealing with this subject available at your local library or auto parts store. The more you know about the computer system, the better and faster you can troubleshoot and fix problems.
The computer module is the heart of the system The computer is permanently programmed by factory engineers. The program is a complex list of instructions telling the computer how to control the engine under various driving conditions. To do its job, the computer needs to know what is happening and then it needs devices to control things.
Other output signals Not all of the computer outgoing signals go to actuators. Sometimes information is sent to electronic modules, such as ignition or trip computer. How the computer controls Fuel Delivery Good driveability and emission performance depends upon precise fuel control. Early computer controlled vehicles used electronically adjustable carburetors, but fuel injectors were soon used later on.
warm-up, so the computer must operate “open loop” at that time. Acceleration, deceleration and idle conditions As long as the engine and oxygen sensor are hot, the computer can operate “closed loop” for best economy and least emissions During the drive conditions listed above, the computer may have to ignore the sensor and run “open loop,” relying on internal programming for fuel delivery instructions. During idle, for example, the oxygen sensor may cool down and stop sending a signal.
mass air flow sensors are used.) Then, the computer adjusts timing according to factory programmed instructions. The computer sends a timing signal to an ignition module which eventually creates the spark. A simpler version uses a conventional distributor with mechanical timing. Here, the computer controls a solenoid to change the vacuum advance timing by a fixed amount when desirable. Some vehicles have a “knock” sensor.
Glossary AAC See Auxiliary Air Control valve. A/C Air Conditioning. A/C Amplifier The A/C Amplifier sends a signal to the ECU representing the temperature at the Evaporator outlet. The ECU then adjusts the engine cooling fan operation as necessary. A/C Switch Air Conditioning switch. Switch signals ECU when Air Conditioning is activated. The ECU will increase idle speed to prevent engine stalling whenever Air Conditioning is engaged.
properly adjust air/fuel mixture and ignition timing for varying engine load and altitude conditions. Automatic Temperature Control (ATC) Maintains a relatively constant intake air temperature. Auxiliary Air Control valve (AAC) The ECU uses the AAC to adjust idle speed by changing the amount of air bypassing the throttle plate. Idle speed increases as more air bypasses the throttle through the AAC.
CTS See Coolant Temperature Sensor or Coolant Temperature Switch. Cylinder Head Temperature Sensor The Cylinder Head Temperature sensor is mounted in the cylinder head usually near the thermostat. Temperature is usually measured by a thermistor - a resistor whose resistance changes with temperature. The hotter the sensor gets, the lower the resistance becomes. Detonation Sensor (KNK) The ECU uses this device to detect engine detonation (knocking).
ECCS Relay Supplies power to the ECCS. ECT Electronic Controlled Transmission. ECU See Electronic Control Unit. EFE See Early Fuel Evaporation. EFI See Electronic Fuel Injection. EFI Main Relay Supplies power to the engine control computer. EGR See Exhaust Gas Recirculation. EGR Bimetallic Vacuum Switching Valve (EGR-BVSV) Allows EGR operation above a predetermined temperature.
ESA See Electronic Spark Advance. EVAP See Evaporative Emission system. EVAP Vapor Canister (EVAP-VC) See Canister. Evaporative Emission System (EVAP) The EVAP system reduces the amount of fuel vapors entering the atmosphere. These vapors are stored in a charcoal canister. During warm engine cruise conditions the stored vapors are drawn into the engine and burned. EVAP-VC See Canister.
Idle Speed Control (ISC) Maintains proper idle speed when engine loading changes. Idle Switch Signals the ECU when the throttle is in the closed (idle) position. Idle-Up Solenoid The Idle-Up solenoid assists the AAC or FICD when the engine is under heavy load. It controls idle speed by adjusting throttle bypass air. Ignition Coil A transformer designed to boost the battery voltage to the high voltage required to cause a spark and ignite the air/fuel mix in the engine’s cylinder.
Mode A type of operating condition, such as “idle mode” or “cruise mode.” M/T PA Sensor (Pressure - Atmosphere.) See Atmospheric Pressure Sensor. Park Switch based upon information from various sensors. PRV See Pressure Regulator Valve. Manual Transmission or Manual Transaxle. Informs the ECU when the gearshift lever is in the Park position. Pulse Generator Neutral switch PCV Relay This switch is mounted on the Manual transmission/Transaxle.
injectors are mounted in the intake manifold. The injectors are fired individually in the same sequence as the spark plug firing sequence. TA Sensor Throttle Sensor Short (circuit) TBI See Throttle Body Injection. Throttle Valve Idle switch (Temperature - Air.) See Air Temperature Sensor. A fault condition: an unwanted connection of one electric circuit to another causing a change in the normal current flow path. TCCS Solenoid See Top Dead Center. See Toyota Computer Control System.
Vehicle Speed Sensor (VSS) Vehicle Speed Sensor. This sensor, mounted in the transmission, sends a frequency signal to the ECU. The frequency increases as the vehicle moves faster to give the ECU vehicle speed information. VSS See Vehicle Speed Sensor. VSV See Vacuum Switching Valve. VTEC See Variable Valve Timing Electronic Control. Wide Open Throttle (WOT) The vehicle operating condition brought about when the throttle is completely (or nearly so) open.
ONE (1) YEAR LIMITED WARRANTY Actron Manufacturing Company (“Actron”) warrants to the original purchaser that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of original purchase. Any unit that fails within this period will be replaced or repaired at Actron’s discretion without charge. If you need to return product, please follow the instructions below.
