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Home/Dodge/Dakota WS/Dodge Dakota WS (1994-1994)/Repair manual/Testing & Diagnostics/Engine Controls - Tests W/codes - 2.5L Tbi: Diagnosis
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Engine Controls - Tests W/codes - 2.5L Tbi: Diagnosis Dodge Dakota WS

Testing & Diagnostics 2 illustrations ~21130 words

SYSTEM DIAGNOSTICS

Note. Malfunction Indicator Light (MIL) may also be referred to as CHECK ENGINE Light.

Self-diagnostic capabilities of this system, if properly used, can simplify testing. Powertrain Control Module (PCM) monitors several different engine control system circuits.

If a problem is sensed with a monitored circuit, PCM memory stores a trouble code, MIL glows and PCM enters limp-in mode. In limp-in mode, PCM compensates for component failure by substituting information from other sources. This allows vehicle operation until repairs can be made.

Test circuits and repair or replace components as required. If problem is repaired or ceases to exist, PCM cancels trouble code after 50 ignition on/off cycles.

A specific trouble code results from a particular system failure. A trouble code does not condemn a specific component; component is not necessarily reason for failure. Trouble codes only suggest probable malfunction area.

VISUAL INSPECTION

Most driveability problems in engine control system result from failed wiring, poor electrical connections or leaking air and vacuum hose connections. To avoid unnecessary component testing, perform a visual inspection before beginning self-diagnostic tests.

DIAGNOSTIC PROCEDURE

Note. DO NOT skip any steps in self-diagnostic tests, or incorrect diagnosis may result.

Always perform a visual inspection before attempting to diagnose engine control system problems. See VISUAL INSPECTION . Enter on-board diagnostics, and retrieve trouble codes. See ENTERING ON-BOARD DIAGNOSTICS . If trouble codes are not present and/or using Diagnostic Readout Box (DRB), proceed to one of following tests.

  1. Go to appropriate «TEST NS-1A»(ref-10881-S00078029512000111000000) if a no-start condition exists or engine stalls after start-up. Perform indicated VERIFICATION TEST after repairs have been made.
  2. Go to appropriate «TEST TC-1A»(ref-10881-S36169031992000111000000) if engine runs but has performance problems. Perform indicated VERIFICATION TEST after repairs have been made.
  3. Go to appropriate «TEST NTC-1A»(ref-10881-S20564304862000111000000) if a driveability problem exits but no trouble codes are present. Perform indicated VERIFICATION TEST after repairs have been made.

ENTERING ON-BOARD DIAGNOSTICS

Note. Although other scan testers are available, manufacturer recommends using Diagnostic Readout Box (DRB). MIL function can be used but has limited diagnostic capability.

DRB Diagnostic Mode

  1. Turn ignition off. Connect DRB to data link connector. Data link connector is located in engine compartment, near PCM.
  2. Start engine (if possible). With foot on brake, move transmission shift lever through all positions, ending in Park (A/T). Turn A/C switch on and then off (if equipped).
  3. Turn engine off. Without starting engine again, turn ignition on. Enter selection No. 1, STAND ALONE DRB-III. Enter selection No. 1, CHRYSLER DOMESTIC. Enter selection No. 1, ENGINE. Proceed until READ DTCS selection is offered. After trouble codes are accessed, see appropriate «TEST NS-1A»(ref-10881-S00078029512000111000000) (NO-START TEST-1A) or «TEST TC-1A»(ref-10881-S36169031992000111000000) (TROUBLE CODE TEST-1A) to diagnose problem.
  4. To erase trouble codes while in this mode, press BACK key. At DRB display, scroll to YES - ERASE FAULTS. A confirmation message should then appear, FAULTS ERASED.

MIL Diagnostic Mode

  1. Start engine (if possible). Move transmission shift lever through all positions, ending in Park. Turn A/C on, then off (if equipped).
  2. Turn engine off. Without starting engine again, turn ignition on, off, on, off and on within 5 seconds. Record 2-digit trouble codes as displayed by flashing MIL.
  3. For example, trouble code 23 is displayed as flash, flash, 4-second pause, flash, flash, flash. After a slightly longer pause, other codes stored are displayed in numerical order. When MIL begins to flash trouble codes, it cannot be stopped. Start over if count is lost. Code 55 indicates end of trouble code display.
  4. Refer to «TROUBLE CODES/MESSAGES»(ref-10881-S36811805402000111000000) to translate trouble code number to a DRB trouble code. Once trouble area is identified, refer to «TEST TC-1A»(ref-10881-S36169031992000111000000) . Use DRB trouble codes to find appropriate test.
  5. As an example, a 2.5L engine starts and runs but has a driveability problem. MIL indicates a Code 14. Refer to «TROUBLE CODES/MESSAGES»(ref-10881-S36811805402000111000000) to translate trouble code number to a DRB trouble code. When DRB trouble code is obtained, refer to appropriate test in this article. To clear trouble codes, see «CLEARING TROUBLE CODES»(ref-10881-S11863532632000111000000) .

CLEARING TROUBLE CODES

Note. Trouble codes can also be cleared using DRB. See DRB DIAGNOSTIC MODE under ENTERING ON-BOARD DIAGNOSTICS .

Trouble codes are cleared by disconnecting negative battery cable for at least 15 seconds, allowing PCM to clear trouble codes.

INACTIVE TROUBLE CODE CONDITION

This procedure applies if you have been sent here from diagnostic tests and have just attempted to simulate condition that initially set trouble code. Following additional checks may assist in identifying a possible intermittent problem

  1. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals.
  2. Visually inspect related wiring harnesses for chafed, pierced or partially broken wires.
  3. Check all pertinent Technical Service Bulletins (TSBs).

TROUBLE CODES/MESSAGES

Note. Not all trouble codes apply to all vehicles. Some trouble codes have more than one meaning. When a trouble code has more than one meaning, MIL is unable to distinguish between different failures.

TEST TC-1A - CHECKING FOR TROUBLE CODES

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Battery must be fully charged before proceeding. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds. Connect DRB to engine diagnostic connector. Record DRB trouble codes.
  2. If DRB has a blank screen or displays RAM TEST FAILURE, CARTRIDGE ERROR, KEY PAD TEST FAILURE, LOW BATTERY or HIGH BATTERY, a DRB failure is indicated. To diagnose and correct these conditions, see VEHICLE COMMUNICATIONS in the article «TESTS W/CODES - BODY CONTROL COMPUTER»(ref-10941) in the ENGINE PERFORMANCE section.
  3. If DRB displays NO RESPONSE, go to «TEST NS-6A»(ref-10881-S21895180932000111000000) . If trouble codes are displayed, see DRB TROUBLE CODE table. If no trouble codes are displayed and a driveability problem is present, go to «TEST NTC-1A»(ref-10881-S20564304862000111000000) . If no trouble codes are displayed and a no-start problem is present, go to «TEST NS-1A»(ref-10881-S00078029512000111000000) .
DTCDRB MessageTest No.
Code 11NO CRANK REFERENCE SIGNAL AT PCMTEST TC-2A
Code 54NO CAM SYNC SIGNAL AT PCMTEST TC-3A
Code 14MAP SENSOR VOLTAGE TOO LOWTEST TC-4A
Code 14MAP SENSOR VOLTAGE TOO HIGHTEST TC-5A
Code 13NO CHANGE IN MAP FROM START TO RUNTEST TC-6A
Code 13SLOW CHANGE IN IDLE MAP SENSOR SIGNALTEST TC-6A
Code 21O2S STAYS AT CENTERTEST TC-7A
Code 52O2S STAYS ABOVE CENTER (RICH)TEST TC-8A
Code 51O2S STAYS BELOW CENTER (LEAN)TEST TC-9A
Code 21O2S SHORTED TO VOLTAGETEST TC-10A
Code 15NO VEHICLE SPEED SENSOR SIGNALTEST TC-11A
Code 25IDLE AIR CONTROL MOTOR CIRCUITSTEST TC-12A
Code 27INJECTOR CONTROL CIRCUITTEST TC-13A
Code 32EGR SYSTEM FAILURETEST TC-17A
Code 32EGR SOLENOID CIRCUITTEST TC-18A
Code 31EVAP PURGE SOLENOID CIRCUITTEST TC-19A
Code 37TORQUE CONVERTER CLUTCH SOLENOID CIRCUITTEST TC-20A
Code 24THROTTLE POSITION SENSOR VOLTAGE LOWTEST TC-21A
Code 24THROTTLE POSITION SENSOR VOLTAGE HIGHTEST TC-22A
Code 23THROTTLE BODY TEMP SENSOR VOLTAGE LOWTEST TC-23A
Code 23THROTTLE BODY TEMP SENSOR VOLTAGE HIGHTEST TC-24A
Code 22ECT SENSOR VOLTAGE TOO LOWTEST TC-25A
Code 22ECT SENSOR VOLTAGE TOO HIGHTEST TC-26A
Code 42NO ASD RELAY OUTPUT VOLTAGE AT PCMTEST TC-27A
Code 42AUTO SHUTDOWN RELAY CONTROL CIRCUITTEST TC-28A
Code 35RAD FAN CONTROL RELAY CIRCUITTEST TC-29A
Code 35LOW SPEED FAN CONTROL RELAY CIRCUITTEST TC-30A
Code 35HIGH SPEED FAN CTRL RELAY CIRCUITTEST TC-31A
Code 33A/C CLUTCH RELAY CIRCUITTEST TC-32A
Code 62PCM FAILURE SRI MILE NOT STOREDTEST TC-36A
Code 63PCM FAILURE EEPROM WRITE DENIEDTEST TC-36A
Code 44BATTERY TEMP SENSOR VOLTS OUT OF LIMITTEST TC-37A
Code 47CHARGING SYSTEM VOLTAGE TOO LOW(1)
Code 46CHARGING SYSTEM VOLTAGE TOO HIGH(1)
Code 41GENERATOR FIELD NOT SWITCHING PROPERLY(1)
Code 34SPEED CONTROL SOLENOID CIRCUITS(2)
Code 17ENGINE IS COLD TOO LONG(3)
Code 53INTERNAL PCM FAILURE(4)
(1) Refer to appropriate ALTERNATORS & REGULATORS article in ELECTRICAL section. (2) Refer to appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES/SAFETY EQUIPMENT section. (3) If engine temperature does not reach 176°F (80°C) after driving 20 minutes, check cooling system. This code may set in error during very cold slow speed driving. (4) Replace PCM and perform TEST VER-1 .
(1)Refer to appropriate ALTERNATORS & REGULATORS article in ELECTRICAL section.
(2)Refer to appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES/SAFETY EQUIPMENT section.
(3)If engine temperature does not reach 176°F (80°C) after driving 20 minutes, check cooling system. This code may set in error during very cold slow speed driving.
(4)Replace PCM and perform TEST VER-1 .

DRB TROUBLE CODES

TEST TC-2A - NO CRANK REFERENCE SIGNAL AT PCM (DTC 11)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Erase trouble codes using DRB. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds.
  2. Using DRB, read trouble codes. If DRB displays NO CRANK REFERENCE SIGNAL AT PCM, go to step 6). If DRB does not display NO CRANK REFERENCE SIGNAL AT PCM, condition required to set trouble code message is not present at this time. Go to next step.
  3. The NO CRANK REFERENCE SIGNAL AT PCM trouble code message sets if Powertrain Control Module (PCM) does not see a Crankshaft Position (CKP) sensor signal during cranking. Possible causes are: failed CKP sensor, open or shorted CKP sensor Gray/Black wire, open or shorted CKP sensor Orange wire, open CKP sensor Black/Light Blue wire, failed distributor drive, excessive clearance between sensor and rotor, damaged rotor or failed Powertrain Control Module (PCM). Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no problems were found with wiring and connectors, go to next step.
  5. Start engine. Wiggle wiring harness from CKP sensor to Powertrain Control Module (PCM). If engine misfired or stalled, repair wiring harness as necessary. Perform TEST VER-2. If engine did not misfire or stall, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  6. Turn ignition off. Disconnect Crankshaft Position (CKP) sensor connector. Inspect CKP sensor connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If sensor connector terminals are okay, go to next step.
  7. Turn ignition on. Using DRB in voltmeter mode, check voltage on CKP sensor connector Orange wire. If voltage is less than 7 volts, go to «TEST TC-2B»(ref-10881-S22535222072000111000000) .
  8. If voltage is more than 7 volts, disconnect coil wire from distributor cap. Place end of coil wire 1/4" from ground. Connect a jumper wire between Gray/Black wire and Black/Light Blue wire on CKP sensor connector harness side.
  9. Make and break connection at CKP sensor connector several times while watching coil wire for spark. If coil wire sparked, go to next step. If coil wire did not spark, go to step 11).
  10. Remove distributor cap. Crank engine while watching rotor. If rotor turned, replace CKP sensor. Perform TEST VER-2. If rotor did not turn, repair distributor drive system as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  11. Turn ignition off. Put DRB in ohmmeter mode. Check resistance on CKP sensor connector Black/Light Blue wire. If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
  12. If resistance is less than 5 ohms, disconnect PCM connector. Inspect PCM sensor connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
  13. Using an external ohmmeter, check resistance of Gray/Black wire between CKP sensor connector harness side and PCM connector terminal No. 24. If resistance is more than 5 ohms, repair open in Gray/Black wire. Perform TEST VER-2.
  14. If resistance is less than 5 ohms, put DRB in ohmmeter mode. Check resistance of CKP sensor connector Gray/Black wire. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in Gray/Black wire. Perform TEST VER-2.

TEST TC-2B - NO CRANK REFERENCE SIGNAL AT PCM

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If PCM connector terminals are okay, go to next step.
  2. Using an external ohmmeter, check resistance of Orange wire between CKP sensor connector harness side and PCM connector terminal No. 7. If resistance is more than 5 ohms, repair open in Orange wire. Perform TEST VER-2.
  3. If resistance is less than 5 ohms, put DRB in ohmmeter mode. Using DRB, check resistance of PCM connector terminal No. 7 (Orange wire). If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in Orange wire. Perform TEST VER-2.

TEST TC-3A - NO CAM SYNC SIGNAL AT PCM (DTC 54)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, erase trouble codes. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds. Using DRB, read trouble codes. If DRB displays NO CAM SYNC SIGNAL AT PCM, go to step 5). If DRB does not display NO CAM SYNC SIGNAL AT PCM, condition required to set trouble code message is not present at this time. Go to next step.
  2. The NO CAM SYNC SIGNAL AT PCM trouble code message sets if Powertrain Control Module (PCM) does not see a Camshaft Position (CMP) sensor signal with crankshaft position sensor signal present. Possible causes are: open CMP sensor Orange wire, open or shorted CMP sensor Tan/Yellow wire, open CMP sensor Black/Light Blue wire, failed CMP sensor, improperly adjusted CMP sensor or failed PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, go to next step. If it was necessary to repair related wiring and connectors, perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  4. Start engine. Wiggle wiring harness from CMP sensor to PCM. If engine misfired or stalled, repair wiring harness as necessary. Perform TEST VER-2. If engine did not misfire or stall, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Turn ignition off. Disconnect Camshaft Position (CMP) sensor connector. Turn ignition on. Using DRB in voltmeter mode, check voltage on CMP sensor connector Orange wire. If voltage is less than 7 volts, repair open in Orange wire. Perform TEST VER-2.
  6. If voltage is more than 7 volts, using DRB, check voltage on CMP sensor connector Tan/Yellow wire. If voltage is more than 4 volts, go to step 10).
  7. If voltage is less than 4 volts, turn ignition off. Disconnect PCM connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
  8. Turn ignition off. Using DRB, check resistance of PCM connector terminal No. 44 (Tan/Yellow wire). If resistance is less than 5 ohms, repair short to ground in Tan/Yellow wire. Perform TEST VER-2.
  9. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of Tan/Yellow wire between CMP sensor connector harness side and PCM connector terminal No. 44. If resistance is more than 5 ohms, repair open in Tan/Yellow wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
  10. Turn ignition off. Using DRB in ohmmeter mode, check resistance of CMP sensor connector Black/Light Blue wire. If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace CMP sensor. Perform TEST VER-2.

TEST TC-4A - MAP SENSOR VOLTAGE TOO LOW (DTC 14)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Start engine. Using DRB, read Manifold Absolute Pressure (MAP) sensor voltage. If MAP sensor voltage is less than .2 volt, go to step 5). If voltage is more than .2 volt, turn engine off. Turn ignition on.
  2. Using DRB, read MAP sensor voltage. If voltage is less than 1.2 volts, go to step 5). If voltage is more than 1.2 volts, wiggle MAP sensor connector and wiring harness while watching DRB display. If MAP sensor voltage changed, repair connector or wiring harness as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  3. If MAP sensor voltage did not change, condition required to set trouble code is not present at this time. The MAP SENSOR VOLTAGE TOO LOW trouble code sets if MAP sensor output is less than 1.2 volts at start or less than .2 volt with engine running. Engine speed must be more than 400 RPM, but less than 1500 RPM and Throttle Position Sensor (TPS) voltage less than one volt. Possible causes are: short to ground in MAP sensor Dark Green/Red wire, MAP sensor shorted internally or loss of MAP sensor 5-volt supply (Violet/White wire). Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Turn ignition on. Ensure engine is off. Disconnect MAP sensor connector. Using DRB, read MAP sensor voltage. If MAP sensor voltage is more than 4 volts, replace MAP sensor. Perform TEST VER-2.
  6. If MAP sensor voltage is less than 4 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance between Dark Green/Red wire and Black/Light Blue wire on MAP sensor connector. If resistance is less than 5 ohms, repair short to ground in Dark Green/Red wire. Perform TEST VER-2.
  7. If resistance is more than 5 ohms, put DRB in ohmmeter mode. Using DRB, check resistance of Dark Green/Red wire on MAP sensor connector. If resistance is less than 5 ohms, repair short to ground in Dark Green/Red wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-5A - MAP SENSOR VOLTAGE TOO HIGH (DTC 14)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Start engine. Using DRB, read Manifold Absolute Pressure (MAP) sensor voltage. If MAP sensor voltage is more than 4.6 volts, go to step 4). If MAP sensor voltage is less than 4.6 volts, wiggle MAP sensor connector and wiring harness while watching DRB display. If MAP sensor voltage changed, repair connector or wiring harness as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  2. If MAP sensor voltage did not change, condition required to set trouble code is not present at this time. The MAP SENSOR VOLTAGE TOO HIGH trouble code sets if MAP sensor output is more than 4.6 volts at start or with engine running for 1.76 seconds. Engine speed must be more than 400 RPM, but less than 1500 RPM and Throttle Position Sensor (TPS) voltage less than one volt. Possible causes are: open MAP sensor Dark Green/Red wire, MAP sensor open internally, open MAP sensor Black/Light Blue wire or short to voltage in MAP sensor Dark Green/Red wire. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  4. Turn ignition on. Ensure engine is off. Disconnect MAP sensor connector. Connect a jumper wire between Dark Green/Red wire and Black/Light Blue wire on MAP sensor connector. Using DRB, read MAP sensor voltage. If DRB displays NO RESPONSE, repair short to voltage in Dark Green/Red wire. Perform TEST VER-2.
  5. If MAP sensor voltage is less than one volt, replace MAP sensor. Perform TEST VER-2. If MAP sensor voltage is more than one volt, move jumper wire from MAP sensor connector Black/Light Blue wire to an engine ground. Using DRB, read MAP sensor voltage.
  6. If MAP sensor voltage is less than one volt, repair open in Black/Light Blue wire. Perform TEST VER-2. If MAP sensor voltage is more than one volt, turn ignition off. Disconnect PCM connector.
  7. Using an external ohmmeter, check resistance of Dark Green/Red wire between MAP sensor connector and PCM connector terminal No. 1. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open in Dark Green/Red wire. Perform TEST VER-2.

TEST TC-6A - NO CHANGE IN MAP FROM START TO RUN AND SLOW CHANGE IN IDLE MAP SENSOR SIGNAL (DTC 13)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition on. Ensure engine is off. Using DRB, read trouble codes. If DRB displays MAP SENSOR VOLTAGE TOO LOW, go to «TEST TC-4A»(ref-10881-S18104588632000111000000) . If DRB does not display MAP SENSOR VOLTAGE TOO LOW, go to next step.
  2. Using DRB, erase trouble codes. Start engine. Allow engine to idle for 30 seconds. With engine running, read trouble codes using DRB. If DRB displays NO CHANGE IN MAP FROM START TO RUN or SLOW CHANGE IN IDLE MAP SENSOR SIGNAL, go to step 9).
  3. If DRB does not display NO CHANGE IN MAP FROM START TO RUN or SLOW CHANGE IN IDLE MAP SENSOR SIGNAL, use DRB to set engine speed to 1500 RPM. With engine running at 1500 RPM, read DRB MAP sensor voltage. While monitoring MAP sensor voltage, wiggle MAP sensor connector and wiring harness while watching DRB display.
  4. If engine stalled or MAP sensor voltage became erratic, inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If engine did not stall or MAP sensor voltage did not become erratic, snap throttle open and closed while monitoring DRB.
  5. If engine vacuum did not rapidly drop to less than one in. Hg, go to step 8). If engine vacuum rapidly dropped to less than one in. Hg, condition required to set trouble code is not present at this time. If trouble code was SLOW CHANGE IN IDLE MAP SENSOR SIGNAL, go to next step. If trouble code was NO CHANGE IN MAP FROM START TO RUN, go to step 7).
  6. The SLOW CHANGE IN IDLE MAP SENSOR SIGNAL trouble code sets if MAP sensor signal is less than .157 volt between firing pulses of engine. Engine speed must be more than 600 RPM, but less than 1500 RPM. Check possible causes: restricted passage to MAP sensor, ice in MAP sensor or passage, MAP sensor failure or failed PCM. Perform TEST VER-2.
  7. The NO CHANGE IN MAP FROM START TO RUN trouble code sets if too small a difference is seen between barometric pressure at key on and manifold vacuum with engine running for 1.72 seconds. Check possible causes: restricted or leaking vacuum/pressure hose to MAP sensor, ice in MAP sensor or passage, MAP sensor failure or failed PCM. Perform TEST VER-2.
  8. Remove MAP sensor vacuum hose. Inspect condition of MAP sensor vacuum hose. If MAP sensor vacuum hose is restricted or open, replace vacuum hose as necessary. Perform TEST VER-2. If MAP sensor vacuum hose is okay, replace MAP sensor. Perform TEST VER-2.
  9. Turn engine off. Tee a vacuum gauge into MAP sensor vacuum hose. Start engine. With engine idling, read vacuum gauge. If vacuum gauge reads zero in. Hg, repair vacuum hose to MAP sensor. Perform TEST VER-2.
  10. If vacuum gauge does not read zero in. Hg, while monitoring vacuum gauge, snap throttle open and closed. If vacuum gauge reading did not rapidly drop to less than one in. Hg, replace MAP sensor vacuum hose as necessary. Perform TEST VER-2.
  11. If vacuum gauge reading rapidly dropped to less than one in. Hg, turn ignition off. Disconnect MAP sensor electrical connector. Turn ignition on. Using DRB in voltmeter mode, check voltage on MAP sensor connector Violet/White wire.
  12. If voltage is less than 4 volts, repair open or short in Violet/White wire. Perform TEST VER-2. If voltage is more than 4 volts, replace MAP sensor. Perform TEST VER-2.

TEST TC-7A - O2S STAYS AT CENTER (DTC 21)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Start engine. Allow engine to run until normal operating temperature is reached. Using DRB, set engine speed to 1500 RPM. Using DRB, read oxygen sensor state. If oxygen sensor is locked at center, go to step 4). If oxygen sensor is not locked at center, wiggle oxygen sensor connector and wiring harness while watching DRB display.
  2. If oxygen sensor was locked at center at any time, inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If oxygen sensor was not locked at center at any time, condition required to set trouble code is not present at this time. The O2S STAYS AT CENTER trouble code sets if oxygen sensor output voltage stays at .5 volt for 1.5 minutes with engine temperature more than 170°F (77°C) and engine running for 2 minutes. Possible causes are: open oxygen sensor circuit or oxygen sensor failure. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  4. Disconnect oxygen sensor connector. Using DRB in ohmmeter mode, check resistance of Black/Light Blue wire at oxygen sensor connector harness side. If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
  5. If resistance is less than 5 ohms, connect a jumper wire between oxygen sensor Black/Dark Green wire (Dark Green/White on AN body) and positive battery terminal. Using DRB, read oxygen sensor voltage. If voltage is more than one volt, replace oxygen sensor. Perform TEST VER-2.
  6. If oxygen sensor voltage is less than one volt, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Disconnect jumper wire between oxygen sensor Black/Dark Green wire (Dark Green/White wire on AN body) and battery positive terminal.
  7. Using an external ohmmeter, check resistance of oxygen sensor Black/Dark Green wire (Dark Green/White wire on AN body) between oxygen sensor connector harness side and PCM connector terminal No. 41. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open in Black/Dark Green wire (Dark Green/White wire on AN body). Perform TEST VER-2.

TEST TC-8A - O2S STAYS ABOVE CENTER (RICH) (DTC 52)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Start engine and apply parking brake. Using DRB, set engine speed to 1500 RPM. Using DRB, read oxygen sensor voltage. If oxygen sensor voltage is always more than .5 volt, condition required to set trouble code is not present at this time. Go to next step. If oxygen sensor voltage is not always more than .5 volt, go to step 3).
  2. The O2S STAYS ABOVE CENTER (RICH) trouble code sets if oxygen sensor output voltage stays at more than .5 volt, but less than 1.2 volts without changing for at least 8 minutes. Possible causes are: high fuel pressure, other engine sensor calibration failures, ignition system failure, oxygen sensor failure or mechanical engine failure. Go to «TEST NTC-1A»(ref-10881-S20564304862000111000000) .
  3. Check oxygen sensor connector for excessive dirt and/or grease build-up. Closely check oxygen sensor connector between Black/Dark Green wire (Dark Green/White wire on AN body) and Dark Green/Black wire (Dark Green/Orange wire on AN body).
  4. If excessive dirt and/or grease build-up is present, clean oxygen sensor connector as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If excessive dirt and/or grease build-up is not present, a condition causing engine to run rich is indicated. Go to «TEST NTC-1A»(ref-10881-S20564304862000111000000) .

TEST TC-9A - O2S STAYS BELOW CENTER (LEAN) (DTC 51)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Start engine and apply parking brake. Using DRB, set engine speed to 1500 RPM. Using DRB, read oxygen sensor voltage. If oxygen sensor voltage is not always less than .5 volt, condition required to set trouble code is not present at this time. Go to next step. If oxygen sensor voltage is always less than .5 volt, go to step 3).
  2. The O2S STAYS BELOW CENTER (LEAN) trouble code sets if oxygen sensor output voltage stays less than .5 volt for at least 8 minutes. Possible causes are: low fuel pressure, vacuum leak, other engine sensor calibration failures, ignition system failure, oxygen sensor failure or mechanical engine failure. Go to «TEST NTC-1A»(ref-10881-S20564304862000111000000) .
  3. Using DRB, check if oxygen sensor voltage is always at zero volts. If oxygen sensor voltage is always zero volts, go to step 5). If oxygen sensor voltage is not always zero volts, check oxygen sensor connector for excessive dirt and/or grease build-up. Closely check oxygen sensor connector Black/Dark Green wire (AS body) or Dark Green/White wire (AN body) for tracking to oxygen sensor connector Black/Tan wire and Black/Light Blue wire.
  4. If excessive dirt and/or grease build-up is present, clean oxygen sensor connector as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If excessive dirt and/or grease build-up is not present, a condition causing engine to run lean is indicated. Go to «TEST NTC-1A»(ref-10881-S20564304862000111000000) .
  5. Using DRB, stop all actuation of vehicle components. Turn ignition on with engine off. Disconnect oxygen sensor connector. Using DRB, read oxygen sensor voltage. If oxygen sensor voltage is always .5 volt, replace oxygen sensor. Perform TEST VER-2.
  6. If oxygen sensor voltage is not always .5 volt, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using DRB in ohmmeter mode, check resistance of Black/Dark Green wire (Dark Green/White wire on AN body) on oxygen sensor connector harness side.
  7. If resistance is less than 5 ohms, repair short to ground in Black/Dark Green wire (Dark Green/White wire on AN body). Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-10A - O2S SHORTED TO VOLTAGE (DTC 21)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, read oxygen sensor voltage. If oxygen sensor voltage is more than 1.2 volts, go to step 4). If oxygen sensor voltage is less than 1.2 volts, wiggle oxygen sensor connector and wiring harness while watching DRB display. If voltage went to more than 1.2 volts at any time, repair wiring and connectors as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  2. If voltage did not go to more than 1.2 volts at any time, condition required to set trouble code is not present at this time. The O2S SHORTED TO VOLTAGE trouble code sets if oxygen sensor signal circuit voltage goes to more than 1.2 volts. Possible causes are: oxygen sensor Black/Dark Green wire (Dark Green/White wire on AN body) shorted to another circuit, oxygen sensor connector contaminated with excessive dirt, grease and/or water build-up or oxygen sensor failure. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  4. Disconnect oxygen sensor connector. Using DRB, read oxygen sensor voltage. If voltage is more than 1.2 volts, repair short to battery voltage in Black/Dark Green wire (Dark Green/White wire on AN body) on oxygen sensor connector harness side. Perform TEST VER-2. If voltage is less than 1.2 volts, replace oxygen sensor. Perform TEST VER-2.

TEST TC-11A - NO VEHICLE SPEED SENSOR SIGNAL (DTC 15)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Raise vehicle so drive wheels are free to spin. Start engine. Using DRB, read Vehicle Speed Sensor (VSS) signal. Put transmission in any forward gear. If DRB displays more than zero MPH, go to step 2). If DRB does not display more than zero MPH and vehicle is not a AN body, go to TEST TC-11B. If DRB does not display more than zero MPH and vehicle is a AN body, go to «TEST TC-11C»(ref-10881-S13907912222000111000000) .
  2. Condition required to set trouble code is not present at this time. The NO VEHICLE SPEED SENSOR SIGNAL trouble code sets if Powertrain Control Module (PCM) does not see a VSS signal at PCM terminal No. 47 (White/Orange wire) for more than 11 seconds. Possible causes are: open or shorted VSS White/Orange wire, failed VSS, open VSS Orange wire, damaged speedometer pinion or failed PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2. If related wiring and connectors were repaired, perform TEST VER-2.

TEST TC-11B - NO VEHICLE SPEED SENSOR SIGNAL

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect VSS connector. Inspect vehicle speed sensor connector for damaged or pushed out terminals. Repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If VSS connector terminals are okay, go to next step.
  2. Turn ignition on. Using DRB in voltmeter mode, check voltage on VSS connector Violet/Black wire. If voltage is less than 7 volts, repair open in appropriate wire. Perform TEST VER-2.
  3. If voltage is more than 7 volts, check VSS connector White/Orange wire using DRB. If voltage is less than 4 volts, go to «TEST TC-11D»(ref-10881-S01515511782000111000000) . If voltage is more than 4 volts, connect a jumper wire to VSS connector White/Orange wire.
  4. Using DRB, read VSS signal. While observing DRB display, touch other end of jumper wire to VSS connector Black/Light Blue wire. If DRB displayed more than zero MPH, go to next step. If DRB did not display more than zero MPH, go to «TEST TC-11E»(ref-10881-S24969522812000111000000) .
  5. Remove VSS from vehicle. Inspect speedometer pinion gear. If speedometer pinion gear is damaged, replace pinion gear. Perform TEST VER-2. If speedometer pinion gear is not damaged, replace VSS. Perform TEST VER-2.

TEST TC-11C - NO VEHICLE SPEED SENSOR SIGNAL

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect VSS connector. Inspect vehicle speed sensor connector for damaged or pushed out terminals. Repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If VSS connector terminals are okay, go to next step.
  2. Turn ignition on. Using DRB in voltmeter mode, check voltage on VSS connector White/Orange wire. If voltage is less than 4 volts, go to TEST TC-11D.
  3. If voltage is more than 4 volts, connect a jumper wire to VSS connector White/Orange wire. Using DRB, read VSS signal. While observing DRB display, touch other end of jumper wire to VSS connector Black/Light Blue wire. If DRB displayed more than zero MPH, go to next step. If DRB did not display more than zero MPH, go to «TEST TC-11E»(ref-10881-S24969522812000111000000) .
  4. Remove VSS from vehicle. Inspect speedometer pinion gear. If speedometer pinion gear is damaged, replace pinion gear. Perform TEST VER-2. If speedometer pinion gear is not damaged, replace VSS. Perform TEST VER-2.

TEST TC-11D - NO VEHICLE SPEED SENSOR SIGNAL

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect PCM connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If PCM connector terminals are okay, put DRB in ohmmeter mode.
  2. Using DRB, check resistance on PCM connector terminal No. 47 (White/Orange wire). If resistance is less than 5 ohms, repair short to ground in White/Orange wire. Perform TEST VER-2.
  3. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of White/Orange wire between VSS connector and PCM connector terminal No. 47. If resistance is more than 5 ohms, repair open in White/Orange wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-11E - NO VEHICLE SPEED SENSOR SIGNAL

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Using DRB in ohmmeter mode, check resistance on VSS connector Black/Light Blue wire. If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If resistance is less than 5 ohms, disconnect PCM connector.
  2. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, using an external ohmmeter, check resistance of White/Orange wire between VSS connector and PCM connector terminal No. 47. If resistance is more than 5 ohms, repair open in White/Orange wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-12A - IDLE AIR CONTROL MOTOR CIRCUITS (DTC 25)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn engine off. Turn ignition on. Start engine. Allow engine to idle for 20 seconds. Using DRB, set engine speed to 1400 RPM. If engine speed is 1300-1500 RPM, go to next step. If engine speed is not 1300-1500 RPM, go to step 7).
  2. Using DRB, reset engine speed to 900 RPM. If engine speed is 800-1000 RPM, go to next step. If engine speed is not 800-1000 RPM, go to step 7).
  3. Condition required to set trouble code is not present at this time. The IDLE AIR CONTROL MOTOR CIRCUITS trouble code sets if any of the 4 Idle Air Control (IAC) motor wires are shorted to ground or battery voltage. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no problems were found with wiring and connectors, start engine. Run engine until operating temperature is reached.
  5. Using DRB, actuate IAC wiggle test. Idle speed should raise and lower slowly with DRB display. If IAC motor operated properly, go to next step. If IAC motor did not operate properly, go to step 7).
  6. Stop IAC wiggle test. If IAC wiggle test functioned properly, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  7. Turn ignition off. Disconnect Idle Air Control (IAC) motor connector. Inspect IAC motor connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If IAC motor connector terminals are okay, put DRB in ohmmeter mode.
  8. Using DRB, check resistance of IAC connector Brown/White wire. If resistance is more than 5 ohms, go to next step. If resistance is less than 5 ohms, repair short to ground in Brown/White wire. Perform TEST VER-2.
  9. Using DRB, check resistance of IAC connector Yellow/Black wire. If resistance is more than 5 ohms, go to next step. If resistance is less than 5 ohms, repair short to ground in Yellow/Black wire. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  10. Using DRB, check resistance of IAC connector Gray/Red wire. If resistance is more than 5 ohms, go to next step. If resistance is less than 5 ohms, repair short to ground in Gray/Red wire. Perform TEST VER-2.
  11. Using DRB, check resistance of IAC connector Violet/Black wire. If resistance is more than 5 ohms, go to next step. If resistance is less than 5 ohms, repair short to ground in Violet/Black wire. Perform TEST VER-2. NOTE: While measuring voltage in steps 12)-15), voltage may switch or remain constant.
  12. Using DRB, actuate IAC motor. Using DRB in voltmeter mode, check voltage of IAC connector Brown/White wire. If voltage is more than 5 volts at any time, go to next step. If voltage was not more than 5 volts at any time, go to TEST TC-12B.
  13. Using DRB, check voltage of IAC connector Yellow/Black wire. If voltage is more than 5 volts at any time, go to next step. If voltage was not more than 5 volts at any time, go to «TEST TC-12C»(ref-10881-S32015035382000111000000) .
  14. Using DRB, check voltage of IAC connector Gray/Red wire. If voltage is more than 5 volts at any time, go to next step. If voltage was not more than 5 volts at any time, go to «TEST TC-12D»(ref-10881-S34213387742000111000000) .
  15. Using DRB, check voltage of IAC connector Violet/Black wire. If voltage is more than 5 volts at any time, go to next step. If voltage was not more than 5 volts at any time, go to «TEST TC-12E»(ref-10881-S32103122952000111000000) .
  16. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If PCM connector terminals are okay, go to next step.
  17. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance between the following wires at IAC motor connector. Record resistance readings. Brown/White Wire And Yellow/Black Wire Brown/White Wire And Gray/Red Wire Brown/White Wire And Violet/Black Wire
  18. If resistance between any 2 wires was less than 5 ohms, repair those wires for shorting together. Perform TEST VER-2. If resistance between all pairs of wires was more than 5 ohms, go to next step.
  19. Using an external ohmmeter, check resistance between the following wires at IAC motor connector. Record resistance readings. Yellow/Black Wire And Gray/Red Wire Yellow/Black Wire And Violet/Black Wire
  20. If resistance between any 2 wires was less than 5 ohms, repair those wires for shorting together. Perform TEST VER-2. If resistance between all pairs of wires was more than 5 ohms, go to next step.
  21. Using an external ohmmeter, check resistance between the following wires at IAC motor connector. Record resistance readings. Gray/Red Wire And Violet/Black Wire
  22. If resistance between wires was less than 5 ohms, repair wires for shorting together. Perform TEST VER-2. If resistance between wires was more than 5 ohms, replace IAC motor. Perform TEST VER-2.

TEST TC-12B - IDLE AIR CONTROL MOTOR CIRCUITS

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If PCM connector terminals are okay, go to next step.
  2. Using an external ohmmeter, check resistance of Brown/White wire between IAC motor connector and PCM connector terminal No. 40. If resistance is more than 5 ohms, repair open in Brown/White wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-12C - IDLE AIR CONTROL MOTOR CIRCUITS

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If PCM connector terminals are okay, go to next step.
  2. Using an external ohmmeter, check resistance of Yellow/Black wire between IAC motor connector and PCM connector terminal No. 60. If resistance is more than 5 ohms, repair open in Yellow/Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-12D - IDLE AIR CONTROL MOTOR CIRCUITS

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
  2. Using an external ohmmeter, check resistance of Gray/Red wire between IAC motor connector and PCM connector terminal No. 39. If resistance is more than 5 ohms, repair open in Gray/Red wire. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-12E - IDLE AIR CONTROL MOTOR CIRCUITS

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If PCM connector terminals are okay, go to next step.
  2. Using an external ohmmeter, check resistance of Violet/Black wire between IAC motor connector and PCM connector terminal No. 59. If resistance is more than 5 ohms, repair open in Violet/Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-13A - INJECTOR CONTROL CIRCUIT (DTC 27)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, erase trouble codes. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds.
  2. Using DRB, read trouble codes. If engine started, allow engine to idle for at least 20 seconds. If DRB displays INJECTOR CONTROL CIRCUIT, go to TEST TC-13B. If DRB does not display INJECTOR CONTROL CIRCUIT, condition required to set trouble code is not present at this time. Go to next step.
  3. The INJECTOR CONTROL CIRCUIT trouble code takes .64-10 seconds to set if Powertrain Control Module (PCM) does not detect an inductive kick .18ms after injector turn off with no other injectors on. Possible causes are: open or shorted injector ground circuit, open injector power supply circuit, open injector or failed driver in PCM. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no problems were found with wiring and connectors, go to next step.
  5. Start engine. Wiggle wiring harness from injector to PCM. If engine misfired or stalled, repair wiring harness as necessary. Perform TEST VER-2. If engine did not misfire or stall, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.

TEST TC-13B - INJECTOR CONTROL CIRCUIT

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect injector connector. Using an external ohmmeter, check injector resistance. If resistance is more than 3 ohms, go to step 7).
  2. If resistance is less than 3 ohms, move one ohmmeter lead from injector terminal to a ground. If resistance is less than 5 ohms, repair injector circuit for a short to ground. Short to ground has occurred in wires leading from connector on throttle body housing to injector or in injector windings. Repair injector wiring or replace injector as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  3. If resistance is more than 5 ohms, turn ignition on. Using DRB, actuate injector. Using DRB, check voltage on injector connector (harness side) Dark Green/Orange wire. If voltage is less than 10 volts, repair open in Dark Green/Orange wire. Perform TEST VER-2.
  4. If voltage is more than 10 volts, turn ignition off. Disconnect PCM connector. Using an external ohmmeter, check resistance of White/Dark Blue wire between injector connector (harness side) and PCM connector terminal No. 16.
  5. If resistance is more than 5 ohms, repair open in White/Dark Blue wire. Perform TEST VER-2. If resistance is less than 5 ohms, put DRB in ohmmeter mode.
  6. Using DRB, check resistance of PCM connector terminal No. 16 White/Dark Blue wire (AN body) or Light Blue wire (AS body). If resistance is less than 5 ohms, repair short to ground in appropriate wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
  7. Remove injector cap from top of injector. Inspect injector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If injector terminals are okay, using an external ohmmeter, check injector resistance.
  8. If resistance is more than 3 ohms, replace injector. Perform TEST VER-2. If resistance is less than 3 ohms, replace injector harness located between injector and throttle body connector. Perform TEST VER-2.

Note. Test procedures skip from TEST TC-13B to TEST TC-17A. No test procedures have been omitted.

TEST TC-17A - EGR SYSTEM FAILURE (DTC 32)

Note. Since diagnosis is done with EGR solenoid electrically disconnected, clear trouble codes after completing diagnosis of EGR system.

  1. Start engine. Allow engine to idle for a least 2 minutes. Disconnect Exhaust Gas Recirculation (EGR) solenoid electrical connector. Leave EGR solenoid electrical connector disconnected for remainder of test. Disconnect vacuum supply hose from EGR solenoid. Connect a vacuum gauge to end of disconnected hose. If vacuum gauge indicates less than 10 in. Hg, repair vacuum supply to EGR solenoid. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  2. If vacuum gauge indicates more than 10 in. Hg, reconnect vacuum hose to EGR solenoid. Disconnect vacuum hose from EGR valve. Connect a vacuum gauge to end of disconnected hose. While observing vacuum gauge, momentarily raise engine speed to more than 2000 RPM.
  3. If vacuum gauge indicated less than 5 in. Hg while throttle was opened, replace EGR valve assembly. Perform TEST VER-2. If vacuum gauge indicated more than 5 in. Hg while throttle was opened, remove vacuum gauge.
  4. Connect a vacuum pump to EGR valve. With engine idling, slowly apply vacuum to EGR valve. If engine idle became rough as vacuum was applied, go to step 6). If engine idle did not become rough as vacuum was applied, turn engine off.
  5. Remove EGR valve and inspect manifold and EGR backpressure tube for restrictions. If restrictions are present, clean as necessary. Perform TEST VER-2. If no restrictions are present, replace EGR valve assembly. Perform TEST VER-2.
  6. Turn ignition off. Apply vacuum to EGR valve. Observe vacuum gauge. If vacuum was not held for at least 10 seconds, replace EGR valve assembly. Perform TEST VER-2.
  7. If vacuum was held for at least 10 seconds, condition required to set trouble code is not present at this time. The EGR SYSTEM FAILURE trouble code sets when Powertrain Control Module (PCM) performs a test of EGR system and monitors oxygen sensor signal for a change, and does not detect any change in oxygen sensor signal. Possible causes are: EGR valve not opening, EGR backpressure tube blocked, EGR passages in manifold are blocked, EGR solenoid malfunctioning, EGR backpressure transducer malfunctioning or failed PCM. Go to next step.
  8. Inspect all related vacuum hoses and connectors and repair as necessary. Perform TEST VER-2. If no problems were found with vacuum hoses and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.

TEST TC-18A - EGR SOLENOID CIRCUIT (DTC 32)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. If vehicle is not equipped with an Exhaust Gas Recirculation (EGR) valve, this trouble code does not apply. If vehicle is equipped with an EGR valve, erase trouble codes using DRB.
  2. Using DRB, actuate EGR solenoid. Using DRB, read trouble codes. If DRB displays EGR SOLENOID CIRCUIT, go to step 6). If DRB does not display EGR SOLENOID CIRCUIT, condition required to set trouble code is not present at this time. Go to next step.
  3. The EGR SOLENOID CIRCUIT trouble code sets if EGR solenoid is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or shorted EGR solenoid, open EGR solenoid Dark Blue wire (AN body) or Dark Blue/White wire (AS body), open or shorted EGR solenoid Gray/Yellow wire or failed PCM. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no problems were found with wiring and connectors, go to next step.
  5. Using DRB, read trouble codes. EGR actuation test should still be running. Wiggle wiring harness from EGR solenoid to PCM. If EGR SOLENOID CIRCUIT trouble code returned, repair wiring harness as necessary. Perform TEST VER-2. If EGR SOLENOID CIRCUIT trouble code did not return, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  6. Turn ignition off. Disconnect EGR solenoid connector. Turn ignition on. Using DRB in voltmeter mode, check voltage on EGR solenoid connector Dark Blue wire (AN body) or Dark Blue/White wire (AS body). If voltage is less than 10 volts, repair open in appropriate wire. Perform TEST VER-2.
  7. If voltage is more than 10 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of Gray/Yellow wire between EGR solenoid connector and PCM connector terminal No. 35. If resistance is more than 5 ohms, repair open in Gray/Yellow wire. Perform TEST VER-2.
  8. If resistance is less than 5 ohms, put DRB in ohmmeter mode. Using DRB, check resistance of PCM connector terminal No. 35 (Gray/Yellow wire). If resistance is less than 5 ohms, repair short to ground in Gray/Yellow wire. Perform TEST VER-2.
  9. If resistance is more than 5 ohms, reconnect EGR solenoid connector. Turn ignition on. Using DRB in voltmeter mode, check voltage on PCM connector terminal No. 35 (Gray/Yellow wire). If voltage is less than 10 volts, replace EGR solenoid. Perform TEST VER-2. If voltage is more than 10 volts, replace PCM. Perform TEST VER-2.

TEST TC-19A - EVAP PURGE SOLENOID CIRCUIT (DTC 31)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, erase trouble codes. Using DRB, actuate Evaporative (EVAP) purge solenoid. Using DRB, read trouble codes. If DRB displays EVAP PURGE SOLENOID CIRCUIT, go to step 5). If DRB does not display EVAP PURGE SOLENOID CIRCUIT, condition required to set trouble code is not present at this time. Go to next step.
  2. The EVAP PURGE SOLENOID CIRCUIT trouble code sets if evaporative purge solenoid is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or shorted evaporative purge solenoid, open evaporative purge solenoid Dark Blue wire (AN body) or Dark Blue/White wire (AS body), open or shorted evaporative purge solenoid Pink/Black wire or failed PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no problems were found with wiring and connectors, go to next step.
  4. Using DRB, read trouble codes. Evaporative purge solenoid actuation test should still be running. Wiggle wiring harness from evaporative purge solenoid to PCM. If EVAP PURGE SOLENOID CIRCUIT trouble code returned, repair wiring harness as necessary. Perform TEST VER-2. If EVAP PURGE SOLENOID CIRCUIT trouble code did not return, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Turn ignition off. Disconnect evaporative purge solenoid connector. Turn ignition on. Using DRB in voltmeter mode, check voltage on solenoid connector Dark Blue wire (AN body) or Dark Blue/White wire (AS body). If voltage is less than 10 volts, repair open in appropriate wire. Perform TEST VER-2.
  6. If voltage is more than 10 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of Pink/Black wire between evaporative purge solenoid connector and PCM connector terminal No. 52. If resistance is less than 5 ohms, repair short to ground in Pink/Black wire. Perform TEST VER-2.
  7. If resistance is more than 5 ohms, reconnect evaporative purge solenoid connector. Turn ignition on. Using DRB in voltmeter mode, check voltage on PCM connector terminal No. 52 (Pink/Black wire). If voltage is less than 10 volts, replace evaporative purge solenoid. Perform TEST VER-2. If voltage is more than 10 volts, replace PCM. Perform TEST VER-2.

TEST TC-21A - THROTTLE POSITION SENSOR VOLTAGE LOW (DTC 24)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, read Throttle Position Sensor (TPS) voltage. If TPS voltage is less than .2 volt, go to step 5). If TPS voltage is more than .2 volt, slowly open and close throttle while observing DRB.
  2. If voltage change was not smooth, replace TPS. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If voltage change was smooth, wiggle wiring harness from TPS to Powertrain Control Module (PCM) while observing DRB. If voltage changed, repair wiring harness as necessary. Perform TEST VER-2.
  3. If voltage did not change, condition required to set trouble code is not present at this time. The THROTTLE POSITION SENSOR VOLTAGE LOW trouble code sets if TPS Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body) is less than .2 volt for .704 seconds or if vehicle speed is more than 20 MPH, engine speed is more than 1500 RPM and vacuum is less than 2 in. Hg with voltage on TPS Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body) less than .5 volt. Possible causes are: short to ground in TPS Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body), TPS sensor failure or open TPS Violet/White wire. Go to next step.
  4. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Disconnect TPS connector. Using DRB, read TPS voltage. If voltage is more than one volt, replace TPS. Perform TEST VER-2. If voltage is less than one volt, check voltage on TPS connector Violet/White wire (AN body) or Dark Blue wire (AS body) using DRB.
  6. If voltage is less than 4 volts, repair open in appropriate wire. If voltage is more than 4 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance between Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body) and Black/Light Blue wire on TPS connector.
  7. If resistance is less than 5 ohms, repair short to ground in Black/Light Blue wire. Perform TEST VER-2. If resistance is more than 5 ohms, put DRB in ohmmeter mode. Using DRB, check resistance of TPS connector Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body).
  8. If resistance is less than 5 ohms, repair short to ground in appropriate wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-22A - THROTTLE POSITION SENSOR VOLTAGE HIGH (DTC 24)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, read Throttle Position Sensor (TPS) voltage. If TPS voltage is more than 4.5 volts, go to step 5). If TPS voltage is less than 4.5 volts, while observing DRB, slowly open and close throttle.
  2. If voltage change was not smooth, replace TPS. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If voltage change was smooth, while observing DRB, wiggle wiring harness from TPS to Powertrain Control Module (PCM). If voltage changed, repair wiring harness as necessary. Perform TEST VER-2.
  3. If voltage did not change, condition required to set trouble code is not present at this time. The THROTTLE POSITION SENSOR VOLTAGE HIGH trouble code sets if TPS Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body) is more than 4.5 volts for .704 second. Possible causes are: open TPS Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body), open TPS Black/Light Blue wire or TPS sensor failure. Go to next step.
  4. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Disconnect TPS connector. Connect a jumper wire between Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body) and Black/Light Blue wire on TPS connector. Using DRB, read TPS voltage. If DRB displays NO RESPONSE, repair short to Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body). If DRB does not display NO RESPONSE, go to next step.
  6. If voltage is less than one volt, replace TPS. Perform TEST VER-2. If voltage is more than one volt, move jumper wire from TPS connector Black/Light Blue wire to an engine ground. Using DRB, read TPS sensor voltage.
  7. If TPS sensor voltage is less than one volt, repair open in Black/Light Blue wire. Perform TEST VER-2. If TPS voltage is more than one volt, turn ignition off. Disconnect PCM connector.
  8. Using an external ohmmeter, check resistance of Orange/Dark Blue wire (AN body) or Dark Blue wire (AS body) between TPS connector and PCM connector terminal No. 22. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open in appropriate wire. Perform TEST VER-2.

TEST TC-23A - THROTTLE BODY TEMP SENSOR VOLTAGE LOW (DTC 23)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, read throttle body temperature sensor voltage. If throttle body temperature sensor voltage is less than .5 volt, go to step 5). If throttle body temperature sensor voltage is more than .5 volt, go to next step.
  2. While observing DRB, wiggle wiring harness from throttle body temperature sensor to Powertrain Control Module (PCM). If voltage changed, repair wiring harness as necessary. Perform TEST VER-2.
  3. If voltage did not change, condition required to set trouble code is not present at this time. The THROTTLE BODY TEMP SENSOR VOLTAGE LOW trouble code sets if throttle body sensor circuit voltage is less than .5 volt. Possible causes are: short to ground in throttle body temperature sensor Black/Red wire, throttle body temperature sensor shorted internally or PCM failure. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Disconnect throttle body temperature sensor connector. Using DRB, read throttle body temperature sensor voltage. If voltage is more than 4 volts, replace throttle body temperature sensor. Perform TEST VER-2. If voltage is less than 4 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector.
  6. Using an external ohmmeter, check resistance of throttle body temperature sensor Black/Red wire and Black/Light Blue wire. If resistance is less than 5 ohms, repair short to ground on Black/Red wire. Perform TEST VER-2.
  7. If resistance is more than 5 ohms, check resistance of throttle body temperature sensor connector Black/Red wire using DRB in ohmmeter mode. If resistance is less than 5 ohms, repair short to ground in Black/Red wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-24A - THROTTLE BODY TEMP SENSOR VOLTAGE HIGH (DTC 23)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, read throttle body temperature sensor voltage. If throttle body temperature sensor voltage is more than 4.5 volts, go to step 5). If throttle body temperature sensor voltage is less than 4.5 volts, go to next step.
  2. While observing DRB, wiggle wiring harness from throttle body temperature sensor to Powertrain Control Module (PCM). If voltage changed, repair wiring harness as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  3. If voltage did not change, condition required to set trouble code is not present at this time. The THROTTLE BODY TEMP SENSOR VOLTAGE HIGH trouble code sets if throttle body sensor circuit voltage is more than 4.9 volts. Possible causes are: open throttle body temperature sensor Black/Red wire, throttle body temperature sensor open internally or open throttle body temperature sensor Black/Light Blue wire. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Disconnect throttle body temperature sensor connector. Connect a jumper wire between Black/Red wire and Black/Light Blue wire on throttle body temperature sensor connector. Using DRB, read throttle body temperature sensor voltage.
  6. If voltage is less than one volt, replace throttle body temperature sensor. Perform TEST VER-2. If voltage is more than one volt, move jumper wire from throttle body temperature sensor connector Black/Light Blue wire to an engine ground.
  7. Using DRB, read throttle body temperature sensor voltage. If voltage is less than one volt, repair open in Black/Light Blue wire. If voltage is more than one volt, turn ignition off. Disconnect Powertrain Control Module (PCM) connector.
  8. Using an external ohmmeter, check resistance of Black/Red wire between throttle body temperature sensor connector and PCM connector terminal No. 21. If resistance is more than 5 ohms, repair open in Black/Red wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-25A - ECT SENSOR VOLTAGE TOO LOW (DTC 22)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, read Engine Coolant Temperature (ECT) sensor voltage. If voltage is less than .5 volt, go to step 4). If voltage is more than .5 volt, wiggle wiring harness from ECT sensor to Powertrain Control Module (PCM) while observing DRB. If voltage changed, repair wiring harness as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  2. If voltage did not change, condition required to set trouble code is not present at this time. The ECT SENSOR VOLTAGE TOO LOW trouble code sets if ECT sensor Tan/Black wire is less than .5 volt for more than 3 seconds. Possible causes are: short to ground in ECT sensor Tan/Black wire, ECT sensor shorted internally or PCM failure. Go to next step.
  3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  4. Disconnect ECT sensor connector. Using DRB, read ECT sensor voltage. If voltage is more than 4 volts, replace ECT sensor. Perform TEST VER-2. If voltage is less than 4 volts, turn ignition off. Disconnect PCM connector.
  5. Using DRB in ohmmeter mode, check resistance of ECT sensor connector Tan/Black wire. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in Tan/Black wire. Perform TEST VER-2.

TEST TC-26A - ECT SENSOR VOLTAGE TOO HIGH (DTC 22)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, read Engine Coolant Temperature (ECT) sensor voltage. If voltage is more than 4.9 volts, go to step 4). If voltage is less than 4.9 volts, wiggle wiring harness from ECT sensor to Powertrain Control Module (PCM) while observing DRB. If voltage changed, repair wiring harness as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  2. If voltage did not change, condition required to set trouble code is not present at this time. The ECT SENSOR VOLTAGE TOO HIGH trouble code sets if ECT sensor Tan/Black wire is more than 4.9 volts for more than 3 seconds. Possible causes are: open ECT sensor Tan/Black wire, ECT sensor open internally, open ECT sensor Black/Light Blue wire or PCM failure. Go to next step.
  3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  4. Disconnect ECT sensor connector. Connect a jumper wire between Tan/Black wire and Black/Light Blue wire on ECT sensor connector. Using DRB, read ECT sensor voltage.
  5. If voltage is less than one volt, replace ECT sensor. Perform TEST VER-2. If voltage is more than one volt, move jumper wire from ECT sensor connector Black/Light Blue wire to an engine ground.
  6. Using DRB, read ECT sensor voltage. If voltage is less than one volt, repair open in Black/Light Blue wire. Perform TEST VER-2. If voltage is more than one volt, turn ignition off. Disconnect Powertrain Control Module (PCM) connector.
  7. Using an external ohmmeter, check resistance of Tan/Black wire between ECT sensor connector and PCM connector terminal No. 2. If resistance is more than 5 ohms, repair open in Tan/Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-27A - NO ASD RELAY OUTPUT VOLTAGE AT PCM (DTC 42)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. If this trouble code is also set with AUTO SHUTDOWN RELAY CONTROL CIRCUIT trouble code, go to TEST TC-28A. If AUTO SHUTDOWN RELAY CONTROL CIRCUIT trouble code is not set, go to next step.
  2. Using DRB, erase trouble codes. Attempt to start engine. If engine starts, let it idle. Using DRB, read trouble codes. If DRB displays NO ASD RELAY OUTPUT VOLTAGE AT PCM, go to step 7).
  3. If DRB does not display NO ASD RELAY OUTPUT VOLTAGE AT PCM, condition required to set trouble code is not present at this time. The NO ASD RELAY OUTPUT VOLTAGE AT PCM trouble code sets if PCM does not detect ASD relay voltage when energized. Check possible causes: open ASD relay Dark Green/Orange wire, open ASD relay Dark Blue/Yellow wire, failed ASD relay or PCM failure. Go to next step.
  4. Inspect all related wiring and connectors. Repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no problems were found with wiring and connectors, go to next step.
  5. Engine must be running before continuing with test. Wiggle wiring harness from ASD relay to Powertrain Control Module (PCM). Using DRB, read trouble codes. If DRB displays NO ASD RELAY OUTPUT VOLTAGE AT PCM, repair wiring harness as necessary. Perform TEST VER-2.
  6. If DRB did not display NO ASD RELAY OUTPUT VOLTAGE AT PCM, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  7. If engine started, go to step 10). If engine did not start, disconnect ASD relay. Using DRB in voltmeter mode, check voltage on ASD relay connector terminal "B" (Red/White wire). If voltage is less than 10 volts, repair open in Red/White wire. Perform TEST VER-2.
  8. If voltage is more than 10 volts, install a known good ASD relay. Attempt to start engine. If engine started, replace original ASD relay. Perform TEST VER-2. If engine did not start, turn ignition off.
  9. Disconnect PCM connector. Using an external ohmmeter, check resistance of Dark Green/Orange wire between ASD relay connector and PCM connector terminal No. 57. If resistance is more than 5 ohms, repair open in Dark Green/Orange wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
  10. Turn ignition off. Disconnect PCM connector. Using an external ohmmeter, check resistance of Dark Green/Orange wire between ASD relay connector and PCM connector terminal No. 57. If resistance is more than 5 ohms, repair open in Dark Green/Orange wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-28A - AUTO SHUTDOWN RELAY CONTROL CIRCUIT (DTC 42)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

Scheme 47

Scheme 47: TEST TC-28A - AUTO SHUTDOWN RELAY CONTROL CIRCUIT (DTC 42)
Scheme 47: TEST TC-28A - AUTO SHUTDOWN RELAY CONTROL CIRCUIT (DTC 42)
  1. Using DRB, erase trouble codes. Using DRB, actuate Auto Shutdown (ASD) relay. If ASD relay is not clicking, go to step 5). If ASD relay is clicking, condition required to set trouble code is not present at this time. Go to next step.
  2. The AUTO SHUTDOWN RELAY CONTROL CIRCUIT trouble code sets if an open or shorted condition is detected in Auto Shutdown (ASD) relay Dark Blue/Yellow wire. Possible causes are: open or short in ASD relay Dark Blue/Yellow wire, open in ASD relay Dark Blue wire (AN body) or Dark Blue/White wire (AS body), ASD relay open or shorted internally or failed driver in PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000). If no problems were found with wiring and connectors, go to next step.
  4. Start engine. Wiggle wiring harness from ASD relay to PCM. If engine stalled while wiggling wiring harness, repair wiring and connectors as necessary. Perform TEST VER-2. If engine did not stall while wiggling wiring harness, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Disconnect ASD relay. Using DRB in voltmeter mode, check voltage on ASD relay connector Dark Blue wire (AN body) or Dark Blue/White wire (AS body). If voltage is less than 10 volts, repair open in appropriate wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
  6. Using an external ohmmeter, check resistance between ASD relay terminals. (Scheme 47) If resistance is more than 100 ohms, replace ASD relay. If resistance is less than 100 ohms, go to next step. (Scheme 47): Testing Auto Shutdown Relay Control Circuit (TC-28A - 2.5L)
  7. Disconnect PCM connector. Using DRB in ohmmeter mode, check resistance of ASD relay connector Dark Blue/Yellow wire. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Yellow wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  8. Using an external ohmmeter, check resistance of Dark Blue/Yellow wire between ASD relay connector and PCM connector terminal No. 51. If resistance is more than 5 ohms, repair open in Dark Blue/Yellow wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-29A - RAD FAN CONTROL RELAY CIRCUIT (DTC 35)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, erase trouble codes. Using DRB, actuate radiator fan relay. If radiator fan relay is not clicking, go to step 5). If radiator fan relay is clicking, condition required to set trouble code is not present at this time. Go to next step.
  2. The RAD FAN CONTROL RELAY CIRCUIT trouble code sets if an open or short is detected in radiator fan relay Dark Blue/Pink wire. Possible causes are: open or short in radiator fan relay coil windings, open or short in radiator fan relay Dark Blue/Pink wire, open or short in radiator fan relay Dark Blue wire (AN body) or Dark Blue/White wire (AS body) or failed driver in PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000). If no problems were found with wiring and connectors, go to next step.
  4. While still actuating radiator fan relay, wiggle wiring harness from radiator fan relay to PCM. If relay stopped clicking while wiggling wiring harness, repair wiring and connectors as necessary. Perform TEST VER-2. If relay did not stop clicking while wiggling wiring harness, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Disconnect radiator fan relay. Using DRB in voltmeter mode, check voltage on radiator fan relay connector Dark Blue wire (AN body) or Dark Blue/White wire (AS body). If voltage is less than 10 volts, repair open in appropriate wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
  6. Using an external ohmmeter, check resistance between radiator fan relay terminals. (Scheme 47) If resistance is more than 100 ohms, replace radiator fan relay. If resistance is less than 100 ohms, go to next step.
  7. Disconnect PCM connector. Using DRB in ohmmeter mode, check resistance of ASD relay connector Dark Blue/Pink wire. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Pink wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  8. Using an external ohmmeter, check resistance of Dark Blue/Pink wire between radiator fan relay connector and PCM connector terminal No. 31. If resistance is more than 5 ohms, repair open in Dark Blue/Pink wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-30A - LOW SPEED FAN CTRL RELAY CIRCUIT (DTC 35)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, erase trouble codes. Using DRB, actuate low speed radiator fan relay. If low speed radiator fan relay is not clicking, go to step 5). If low speed radiator fan relay is clicking, condition required to set trouble code is not present at this time. Go to next step.
  2. The LOW SPEED FAN CTRL RELAY CIRCUIT trouble code sets if an open or short is detected in low speed radiator fan relay Dark Blue/Pink wire. Possible causes are: open or short in low speed radiator fan relay coil windings, open or short in low speed radiator fan relay Dark Blue/Pink wire, open or short in low speed radiator fan relay Dark Blue/White wire or failed driver in PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000). If no problems were found with wiring and connectors, go to next step.
  4. While still actuating low speed radiator fan relay, wiggle wiring harness from low speed radiator fan relay to PCM. If relay stopped clicking while wiggling wiring harness, repair wiring and connectors as necessary. Perform TEST VER-2. If relay did not stop clicking while wiggling wiring harness, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Disconnect low speed radiator fan relay. Using DRB in voltmeter mode, check voltage on low speed radiator fan relay connector Dark Blue/White wire. If voltage is less than 10 volts, repair open in Dark Blue/White wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
  6. Using an external ohmmeter, check resistance between low speed radiator fan relay terminals. (Scheme 47) If resistance is more than 100 ohms, replace low speed radiator fan relay. If resistance is less than 100 ohms, go to next step.
  7. Disconnect PCM connector. Using DRB in ohmmeter mode, check resistance of low speed radiator fan relay connector Dark Blue/Pink wire. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Pink wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  8. Using an external ohmmeter, check resistance of Dark Blue/Pink wire between low speed radiator fan relay connector and PCM connector terminal No. 31. If resistance is more than 5 ohms, repair open in Dark Blue/Pink wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-31A - HIGH SPEED FAN CTRL RELAY CIRCUIT (DTC 35)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, erase trouble codes. Using DRB, actuate high speed radiator fan relay. If high speed radiator fan relay is not clicking, go to step 5). If high speed radiator fan relay is clicking, condition required to set trouble code is not present at this time. Go to next step.
  2. The HIGH SPEED FAN CTRL RELAY CIRCUIT trouble code sets if an open or short is detected in high speed radiator fan relay Yellow wire. Possible causes are: open or short in high speed radiator fan relay coil windings, open or short in high speed radiator fan relay Yellow wire, open or short in high speed radiator fan relay Dark Blue/White wire or failed driver in PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000). If no problems were found with wiring and connectors, go to next step.
  4. While still actuating high speed radiator fan relay, wiggle wiring harness from high speed radiator fan relay to PCM. If relay stopped clicking while wiggling wiring harness, repair wiring and connectors as necessary. Perform TEST VER-2. If relay did not stop clicking while wiggling wiring harness, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article. Perform TEST VER-2.
  5. Disconnect high speed radiator fan relay. Using DRB in voltmeter mode, check voltage on high speed radiator fan relay connector Dark Blue/White wire. If voltage is less than 10 volts, repair open in Dark Blue/White wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
  6. Using an external ohmmeter, check resistance between high speed radiator fan relay terminals. (Scheme 47) If resistance is more than 100 ohms, replace high speed radiator fan relay. If resistance is less than 100 ohms, go to next step.
  7. Disconnect PCM connector. Using DRB in ohmmeter mode, check resistance of high speed radiator fan relay connector Yellow wire. If resistance is less than 5 ohms, repair short to ground in Yellow wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  8. Using an external ohmmeter, check resistance of Yellow wire between high speed radiator fan relay connector and PCM connector terminal No. 55. If resistance is more than 5 ohms, repair open in Yellow wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-32A - A/C CLUTCH RELAY CIRCUIT (DTC 33)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, erase trouble codes. Using DRB, actuate A/C clutch relay. If A/C clutch relay is not clicking, go to step 5). If A/C clutch relay is clicking, condition required to set trouble code is not present at this time. Go to next step.
  2. The A/C CLUTCH RELAY CIRCUIT trouble code sets if an open or short is detected in A/C clutch relay Dark Blue/Orange wire. Possible causes are: open or short in A/C clutch relay coil windings, open or short in A/C clutch relay Dark Blue/Orange wire, open or short in A/C clutch Gray wire (AN body) or Red/Light Blue wire (AS body) or failed driver in PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000). If no problems were found with wiring and connectors, go to next step.
  4. While still actuating A/C clutch relay, wiggle wiring harness from A/C clutch relay to PCM. If relay stopped clicking while wiggling wiring harness, repair wiring and connectors as necessary. Perform TEST VER-2. If relay did not stop clicking while wiggling wiring harness, see «INACTIVE TROUBLE CODE CONDITION»(ref-10881-S24382546472000111000000) in this article.
  5. Disconnect A/C clutch relay. Using DRB in voltmeter mode, check voltage on A/C clutch relay connector Dark Blue/Black wire. If voltage is less than 10 volts, go to step 9). Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
  6. Using an external ohmmeter, check resistance between A/C clutch relay terminals. (Scheme 47) If resistance is more than 100 ohms, replace A/C clutch relay. If resistance is less than 100 ohms, go to next step.
  7. Disconnect PCM connector. Using DRB in ohmmeter mode, check resistance of A/C clutch relay connector Dark Blue/Orange wire. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Orange wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  8. Using an external ohmmeter, check resistance of Dark Blue/Orange wire between A/C clutch relay connector and PCM connector terminal No. 34. If resistance is more than 5 ohms, repair open in Dark Blue/Orange wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. NOTE: A/C clutch relay is supplied voltage from radiator fan relay.
  9. Disconnect radiator fan relay. Using DRB in voltmeter mode, check voltage on radiator fan relay connector Gray wire. If voltage is less than 10 volts, repair open in Gray wire. Perform TEST VER-2.
  10. If voltage is more than 10 volts, substitute low speed radiator fan relay for a known good low speed radiator fan relay. Using DRB, actuate A/C clutch relay.
  11. Using DRB in voltmeter mode, check voltage on radiator fan relay Light Green wire. If voltage is more than 10 volts, replace original low speed radiator fan relay. Perform TEST VER-2. If voltage is less than 10 volts, repair open in radiator fan relay Light Green wire. Perform TEST VER-2.

Note. Test procedures skip from TEST TC-32A to TEST TC-36A. No test procedures have been omitted.

TEST TC-36A - PCM FAILURE SRI MILE NOT STORED AND PCM FAILURE EEPROM WRITE DENIED (DTC 62 & 63)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition on. Using DRB, perform SRI memory test. If DRB displays WRITE FAILURE, replace Powertrain Control Module (PCM). Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If DRB does not display WRITE FAILURE, go to next step.
  2. If DRB displays WRITE REFUSED, go to step 4). If DRB does not display WRITE REFUSED, go to next step.
  3. If DRB displays SRI MILEAGE INVALID, update mileage and retest SRI memory. Perform TEST VER-2. If DRB does not display SRI MILEAGE INVALID, compare SRI mileage stored with instrument panel odometer. If mileage is the same, retest SRI memory. Perform TEST VER-2. If mileage is not the same, update mileage and retest SRI memory. Perform TEST VER-2.
  4. When DRB displays WRITE REFUSED this means PCM was busy. Using DRB, perform SRI memory test. Retest SRI memory 2 more times if necessary. If DRB displays WRITE REFUSED, replace PCM. Perform TEST VER-2. If DRB does not display WRITE REFUSED, vehicle is functioning properly. Perform TEST VER-2.

TEST TC-37A - BATTERY TEMP SENSOR VOLTS OUT OF LIMIT (DTC 44)

Using DRB, erase trouble codes. Turn ignition off and wait 10 seconds. Using DRB, read trouble codes. If DRB displays BATTERY TEMP SENSOR VOLTAGE trouble code, replace PCM. Perform TEST VER-2 . If DRB does not display BATTERY TEMP SENSOR VOLTAGE trouble code, system is functioning properly at this time. Perform TEST VER-2.

No Trouble Code Complete Test

Check technical service bulletins for any pertinent information. If a TSB exists, perform corrective action. If TSB does not exist or if driveability problem still exists, perform tests NTC-2A through NTC-15A in sequence until driveability problem is found. See NO TROUBLE CODE TEST MENU table.

ApplicationTest
Checking Secondary Ignition & TimingTEST NTC-2A
Checking Fuel PressureTEST NTC-3A
Checking Coolant Sensor Calibration & Radiator Fan OperationTEST NTC-4A
Checking TPS CalibrationTEST NTC-5A
Checking MAP Sensor CalibrationTEST NTC-6A
Checking Oxygen (O2) Sensor SwitchingTEST NTC-7A
Checking Idle Air Control MotorTEST NTC-8A
Checking Solenoid OperationsTEST NTC-9A
Checking Park/Neutral SwitchTEST NTC-10A
Checking PCM Grounds & Power CircuitsTEST NTC-11A
Checking EGR SystemTEST NTC-12A
Checking Engine VacuumTEST NTC-13A
Checking Minimum Idle AirflowTEST NTC-14A
No Trouble Code Mechanical TestTEST NTC-15A

NO TROUBLE CODE TEST MENU

No Trouble Code Quick Individual Test

If it is suspected that any of the items listed in NO TROUBLE CODE TEST MENU table is the cause of a vehicle's driveability problem, perform associated test(s) individually. If driveability problem still exists, return to NO TROUBLE CODE TEST MENU table, or perform NO TROUBLE CODE COMPLETE TEST.

No Trouble Code Quick Symptom Test

Symptom checks cannot be used properly unless the driveability problem characteristic actually happens while the vehicle is being tested. To reduce diagnostic time, ensure that TEST TC-1A is reviewed before attempting to diagnose a symptom.

Select symptom that most accurately describes the vehicle's driveability problem and then perform the test pertaining to this symptom. Perform each test in sequence until problem is found. See NO TROUBLE CODE QUICK SYMPTOM TEST MENU table.

ApplicationTest
Hard StartNTC-2A , 3A-8A , 11A , 14A , 15A
Start & StallNTC-2A , 3A-6A , 8A , 11A , 15A
Hesitation/Sag/Stumble(1)
SurgeNTC-2A , 3A-8A , 11A , 12A , 15A
Lack Of Power/SluggishNTC-2A , 3A-8A , 11A , 13A , 15A
Spark Knock/DetonationNTC-2A , 3A-9A , 11A , 12A , 15A
Cuts Out/MissesNTC-2A , 3A , 7A , 9A , 11A , 13A , 15A
Backfire/PopbackNTC-2A , 3A , 6A , 7A , 11A , 13A , 15A
Runs Rough/Unstable/Erratic Idle(1)
Poor Fuel Economy(1)
(1) Perform tests NTC-2A through NTC-15A in sequence. See NO TROUBLE CODE TEST MENU
(1)Perform tests NTC-2A through NTC-15A in sequence. See NO TROUBLE CODE TEST MENU

NO TROUBLE CODE QUICK SYMPTOM TEST MENU

TEST NTC-2A - CHECKING SECONDARY IGNITION & TIMING

  1. Turn engine off. Connect engine analyzer to engine. Start engine, and let it idle. If engine will not idle, maintain engine speed for reading scope pattern. Set scope to read display or parade pattern. Follow equipment manufacturer's procedure for pattern analysis.
  2. If secondary ignition pattern is not okay, repair indicated component in secondary ignition system. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If secondary ignition pattern is okay, disconnect any spark plug wire. Observe secondary kilovolt line.
  3. If open circuit secondary voltage is not at least 25 kilovolts, replace electronic ignition coil. Perform TEST VER-2. If open circuit secondary voltage is at least 25 kilovolts, reinstall spark plug wire.
  4. Ensure engine temperature is more than 180°F (82°C) before proceeding. Disconnect Engine Coolant Temperature (ECT) sensor connector. When ECT sensor is disconnected, ECT sensor trouble code will set and warning light will come on. Connect a timing light to engine.
  5. Check ignition timing. If ignition timing is not within 2 degrees of specification, adjust ignition timing to specification. Perform TEST VER-2. If ignition timing is within 2 degrees of specification, using timing light adjustment, zero timing mark in window.
  6. Remove camshaft inspection plug from camshaft cover. Using timing light, check camshaft timing. Camshaft timing index hole should be in center of inspection hole. If camshaft timing index hole is not in center of inspection hole, repair incorrect camshaft timing as necessary. Perform TEST VER-2.
  7. If camshaft timing index hole is in center of inspection hole, reconnect ECT sensor connector. Using DRB, read spark advance. Increase engine speed to 2000 RPM. If spark advance does not change with increase in RPM, replace Powertrain Control Module (PCM). Perform TEST VER-2. If spark advance changes with increase in RPM, ECT sensor and ignition timing are operating properly. Using DRB, erase ECT sensor trouble code. Test is complete.

TEST NTC-3A - CHECKING FUEL PRESSURE

WARNINGHigh fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE procedure in this article.
  1. Release fuel pressure. Connect fuel pressure gauge to fuel supply line. Turn ignition on. Using DRB, actuate fuel system. Observe fuel pressure gauge. See FUEL PRESSURE SPECIFICATIONS table. FUEL PRESSURE SPECIFICATIONS Application psi (kg/cm 2 ) AN Body 11.5-17.5 (.8-1.2) AS Body 34-44 (2.4-3.1)
  2. If fuel pressure is within specification, test is complete. If fuel pressure is more than specification, go to TEST NTC-3B. If fuel pressure is less than specification, stop actuation test. Turn ignition off.
  3. Inspect fuel lines for kinked or restricted lines. Repair fuel lines as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no kinked or restricted lines exist, release fuel pressure. Remove fuel pressure gauge. Install fuel pressure gauge between fuel tank and fuel filter. Turn ignition on. Using DRB, actuate fuel system. If fuel pressure is at least 5 psi (.4 kg/cm 2 ) more than previously recorded pressure, replace fuel filter. Perform TEST VER-2. CAUTION: DO NOT allow fuel pressure to exceed 60 psi (4.2 kg/cm 2 ) when squeezing fuel return hose.
  4. If fuel pressure is not at least 5 psi (.4 kg/cm 2 ) more than previous reading, gently squeeze fuel return hose while observing fuel pressure gauge, ensuring fuel pressure does not exceed 60 psi (4.2 kg/cm 2 ). If fuel pressure increases, replace fuel pressure regulator. Perform TEST VER-2. If fuel pressure does not increase, replace fuel pump and sock assembly. Perform TEST VER-2.

TEST NTC-3B - CHECKING FUEL PRESSURE

WARNINGHigh fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE procedure in this article.
  1. Using DRB, stop fuel system actuation. Release fuel pressure. Ensure fuel tank is at least 1/4 full before performing following test. Install fuel pressure gauge and adapter between fuel tank and filter at rear of vehicle.
  2. Remove fuel return line from fuel pump at fuel tank. Connect Fuel Pressure Test Adapter (6541) to fuel return line. Place other end of adapter hose into an approved 2-gallon gasoline can. Turn ignition on. Using DRB, actuate fuel system. Observe fuel pressure gauge. See FUEL PRESSURE SPECIFICATIONS table. FUEL PRESSURE SPECIFICATIONS Application psi (kg/cm 2 ) AN Body 11.5-17.5 (.8-1.2) AS Body 34-44 (2.4-3.1)
  3. If fuel pressure is within specification, repair fuel return line for a restriction at fuel tank. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If fuel pressure is not within specification, stop actuation test. Turn ignition off. Reconnect fuel return line to fuel tank.
  4. Disconnect fuel return line at throttle body. Connect Fuel Pressure Test Adapter (6541) to fuel return line.
  5. Place other end of adapter hose into an approved 2-gallon gasoline can. Turn ignition on. Using DRB, actuate fuel system. Observe fuel pressure gauge. See FUEL PRESSURE SPECIFICATIONS table.
  6. If fuel pressure is within specification, repair fuel return line for a restriction to the fuel tank. Perform TEST VER-2. If fuel pressure is not within specification, stop actuation test. Turn ignition off. Replace fuel pressure regulator. Reconnect fuel return line to throttle body. Perform TEST VER-2.

TEST NTC-7A - CHECKING OXYGEN (O2) SENSOR SWITCHING

WARNINGHigh fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE procedure in this article.
  1. Allow engine to reach normal operating temperature. Using DRB, read O2 sensor state. If O2 sensor state is switching, system is functioning properly. Test is complete. If O2 sensor state is not switching, check if O2 sensor is locked on lean. If O2 sensor is locked on lean, go to TEST NTC-7B. If O2 sensor is not locked on lean, turn engine off.
  2. Release fuel pressure. Install fuel pressure gauge in fuel supply line. Turn ignition on. Using DRB, actuate fuel system. Allow fuel pressure gauge to stabilize to normal fuel pressure. Stop fuel system actuation. Monitor fuel pressure gauge for one minute.
  3. If fuel pressure gauge reading drops more than 10 psi (.7 kg/cm 2 ), replace leaking injector(s) or "O" rings as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If fuel pressure gauge reading does not drop more than 10 psi (.7 kg/cm 2 ), go to next step.
  4. Inspect air cleaner and inlet ducts for restriction(s). Repair as necessary. Perform TEST VER-2. If no restrictions are present, go to «TEST NTC-15A»(ref-10881-S13524144062000111000000) .

TEST NTC-7B - CHECKING OXYGEN (O2) SENSOR SWITCHING

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Allow engine to idle. Inspect engine for vacuum leaks. Repair vacuum leaks as necessary. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no vacuum leaks exist, read O2 sensor signal voltage using DRB.
  2. If voltage is more than 0.1 volt, go to step 4). If voltage is less than 0.1 volt, turn ignition off. Disconnect O2 sensor connector. Disconnect Powertrain Control Module (PCM) connector. Using DRB in ohmmeter mode, check resistance of O2 sensor connector Black/Dark Green wire.
  3. If resistance is less than 10 ohms, repair short to ground in Black/Dark Green wire. Perform TEST VER-2. If resistance is more than 10 ohms, replace O2 sensor. Perform TEST VER-2.
  4. Turn engine off. Replace O2 sensor. Turn ignition on. Using DRB, reset adaptive fuel memory. Start engine. Allow engine to reach normal operating temperature.
  5. Using DRB, read O2 sensor state. If O2 sensor state is switching, repair is complete. Perform TEST VER-2. If O2 sensor state is not switching, go to «TEST NTC-15A»(ref-10881-S13524144062000111000000) .

TEST NTC-8A - CHECKING IDLE AIR CONTROL MOTOR

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, set engine speed to 1100 RPM. If engine speed set at 1050-1150 RPM, idle speed motor is operating properly, test is complete. If engine speed did not set at 1050-1150 RPM, return engine to normal idle speed. Disconnect idle air control motor connector.
  2. Using DRB in voltmeter mode, check voltage on idle air control motor connector Brown/White wire while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-8B. If voltage is more than one volt, go to next step.
  3. Using DRB, check voltage on idle air control motor connector Yellow/Black wire while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-8B. If voltage is more than one volt, go to next step.
  4. Using DRB, check voltage on idle air control motor connector Gray/Red wire while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-8B. If voltage is more than one volt, go to next step.
  5. Using DRB, check voltage on idle air control motor connector Violet/Black wire while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-8B. If voltage is more than one volt, go to next step.
  6. Check engine for vacuum leaks. Repair as required. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If no vacuum leaks are observed, replace idle air control motor. Perform TEST VER-2.

TEST NTC-8B - CHECKING IDLE AIR CONTROL MOTOR

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

Turn engine off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance on each wire between Idle Air Control (IAC) motor connector and PCM connector. See PCM TERMINAL IDENTIFICATION table. If resistance for any wire was more than 10 ohms, repair open on necessary wire. Perform TEST VER-2 . If resistance for all wires was less than 10 ohms, replace PCM. Perform TEST VER-2.

Wire ColorTerminal No.
Gray/Red39
Brown/White40
Violet/Black59
Yellow/Black60

PCM TERMINAL IDENTIFICATION

TEST NTC-10A - CHECKING PARK/NEUTRAL SWITCH

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, read park/neutral switch input state. While watching DRB display, move gear selector in and out of Park and Reverse positions. If display shows P/N and D/R, system is functioning correctly. Test is complete. If display does not show P/N and D/R, go to next step.
  2. Turn ignition off. Place gear selector in Park position. Disconnect Powertrain Control Module (PCM) connector. Using DRB in ohmmeter mode, check resistance on PCM connector terminal No. 30 (Brown/Yellow wire on AS body) or (Brown/Light Blue wire on AN body). Observe DRB display while moving gear selector in and out of Park and Reverse positions.
  3. If display switches from less than 5 ohms to more than 5 ohms, replace PCM. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If display does not switch from less than 5 ohms to more than 5 ohms, check if display always stays less than 5 ohms. If display always stays less than 5 ohms, repair short to ground in Brown/Yellow wire (AS body) or Brown/Light Blue wire (AN body). Perform TEST VER-2. If display does not always stay less than 5 ohms, go to next step.
  4. Disconnect park/neutral switch connector. Using an external ohmmeter, check resistance of Brown/Yellow wire (AS body) or Brown/Light Blue wire (AN body) between park/neutral switch connector and PCM connector terminal No. 30. If resistance is less than 5 ohms, replace park/neutral switch. Perform TEST VER-2. If resistance is more than 5 ohms, repair open in Brown/Yellow wire on AS body or Brown/Light Blue wire on AN body. Perform TEST VER-2.

TEST NTC-11A - CHECKING PCM GROUND & POWER CIRCUITS

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using DRB in ohmmeter mode, check resistance of PCM connector terminal No. 5 (Black/White wire). If resistance is more than 5 ohms, repair open in Black/White wire. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If resistance is less than 5 ohms, go to next step.
  2. Using DRB, check resistance of PCM connector terminal No. 11 Black/Tan wire. If resistance is more than 5 ohms, repair open in Black/Tan wire. Perform TEST VER-2. If resistance is less than 5 ohms, go to next step.
  3. Using DRB, check resistance of PCM connector terminal No. 12 Black/Tan wire. If resistance is more than 5 ohms, repair open in Black/Tan wire. Perform TEST VER-2. If resistance is less than 5 ohms, go to next step.
  4. Put DRB in voltmeter mode. Turn ignition on. Using DRB, check voltage on PCM connector terminal No. 9 (Dark Blue wire). If voltage is less than 10 volts, repair open in Dark Blue wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off. Reconnect PCM connector. PCM grounds and power circuits are okay. Test is complete.

TEST NTC-12A - CHECKING EGR SYSTEM

  1. If vehicle is not equipped with an Exhaust Gas Recirculation (EGR) valve, this check does not apply. If vehicle is equipped with an EGR valve, read module information using DRB.
  2. If module information indicates vehicle is equipped with California emissions, this test does not apply, however this test can still be performed. Go to next step. If module information indicates vehicle is not equipped with California emissions, go to next step.
  3. Disconnect vacuum hose from EGR solenoid. Connect vacuum gauge to disconnected vacuum hose. On AN body, connect vacuum gauge to top port of EGR solenoid connector. On all vehicles, start engine. If Vacuum is more than 10 in. Hg at idle, go to step 5).
  4. If vacuum is less than 10 in. Hg at idle, disconnect EGR vacuum signal hose at intake manifold. Connect a vacuum gauge to intake nipple. Read vacuum gauge at idle. If vacuum is more than 10 in. Hg at idle, repair restriction or leak in vacuum hose to EGR solenoid. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) . If vacuum is less than 10 in. Hg at idle, repair plugged vacuum nipple at intake nipple. Perform TEST VER-2.
  5. Disconnect vacuum gauge. Reconnect vacuum hose to EGR solenoid. Disconnect vacuum hose from EGR valve. Connect vacuum gauge to disconnected hose. While observing vacuum gauge, disconnect EGR solenoid electrical connector. If vacuum is less than 5 in. Hg, replace EGR valve assembly. Perform TEST VER-2. If vacuum is more than 5 in. Hg, go to next step.
  6. Disconnect hose to EGR valve backpressure signal tube. Adjust a shop air hose to 20 psi (1.4 kg/cm 2 ). Turn ignition off. Connect shop air to nipple on base of EGR valve. Listen for a tone change while opening and closing throttle.
  7. If tone changes, replace EGR valve. Perform TEST VER-2. If tone does not change, remove vacuum gauge. Cap open nipple at EGR valve base. Connect hand-held vacuum pump to EGR valve.
  8. Start engine. Listen for engine RPM change while slowly applying vacuum to EGR valve. If engine RPM does not change, replace EGR valve. Perform TEST VER-2. If engine RPM changes, turn ignition off. Apply 10 in. Hg and hold for 30 seconds. If vacuum holds for 30 seconds, EGR system is functioning properly. Test is complete. If vacuum does not hold for 30 seconds, replace EGR valve. Perform TEST VER-2.

TEST NTC-13A - CHECKING ENGINE VACUUM

Connect a vacuum gauge to engine. Start engine, and let it idle. Normal vacuum reading will vary depending on altitude. Observe vacuum gauge at idle. If vacuum gauge reading is not steady 13-22 in. Hg, perform TEST NTC-15A. If vacuum gauge reading is steady 13-22 in. Hg, engine vacuum is normal. Test is complete. Perform TEST VER-2 .

TEST NTC-14A - CHECKING MINIMUM IDLE AIRFLOW

  1. Turn ignition off. Remove air cleaner assembly. Plug heated air door vacuum hose. Disconnect PCV valve hose from vacuum nipple. Install Vacuum Fitting (6457) to intake manifold PCV nipple. Start engine. Allow engine to reach normal operating temperature.
  2. If vehicle has less than 1000 miles on odometer, go to next step. If vehicle has more than 1000 miles on odometer, actuate minimum airflow using DRB. Engine speed should be 1050-1250 RPM. If engine speed is within specification, minimum airflow is normal. Test is complete. If engine speed is not within specification, replace throttle body. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  3. Using DRB, actuate minimum airflow. Engine speed should be 650-1250 RPM. If engine speed is within specification, minimum airflow is normal. Test is complete. If engine speed is not within specification, replace throttle body. Perform TEST VER-2.

TEST NTC-15A - NO TROUBLE CODE MECHANICAL TEST

At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a driveability problem. Following additional items should be checked as possible causes

Note. If coming to this test from O2 sensor test and rich or lean condition is not corrected after checking items listed below, replace Powertrain Control Module (PCM).

  1. Check if any technical service bulletins apply to vehicle.
  2. Check engine compression.
  3. Check for exhaust system restriction.
  4. Check camshaft and crankshaft sprockets.
  5. Check valve timing.
  6. Check torque converter stall speed.
  7. Check engine vacuum. It must be at least 13 in. Hg in Neutral.
  8. Check for fuel contamination.
  9. Ensure PCV system is functioning properly.
  10. Ensure injector control circuit is connected to correct fuel injector and injector is not plugged or restricted.
  11. Check power booster for internal vacuum leak.

TEST NS-1A - QUALIFYING NO START CONDITION

CAUTIONWhen checking for spark, Powertrain Control Module (PCM) damage may occur if spark plug cable is held more than 1/4" away from ground.

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Attempt to crank engine. If engine does not crank, go to «TEST NS-9A»(ref-10881-S36620807652000111000000) . If engine cranks, turn ignition off. Disconnect any spark plug cable at spark plug. Insert an insulated screwdriver in spark plug cable terminal. Hold screwdriver within 1/4" of ground. NOTE: When checking for spark, consider one or two sparks as a no-spark condition.
  2. While cranking engine for 10 seconds, watch for spark. If a good spark occurs, go to TEST NS-2A. If a good spark does not occur, reconnect spark plug cable. Disconnect another spark plug cable at spark plug, and repeat test.
  3. If a good spark occurs, replace spark plug cable that was initially used to test for spark. If a good spark does not occur, disconnect ignition coil wire. Hold coil wire within 1/4" of ground. While cranking engine for 10 seconds, watch for spark.
  4. If good spark occurs, repair secondary ignition system as necessary. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If a good spark does not occur, turn ignition off. Remove ignition coil secondary cable. Using an external ohmmeter, check resistance of ignition coil secondary cable.
  5. If resistance is more than 15 k/ohms, replace ignition coil secondary cable. Perform TEST VER-1. If resistance is less than 15 k/ohms, remove distributor cap. While watching distributor rotor, crank engine. If rotor did not turn, repair distributor drive system. Perform TEST VER-1.
  6. If rotor turned, reinstall distributor cap. Reinstall ignition coil secondary cable. Disconnect ignition coil electrical connector. Inspect all terminals. Repair as required. Perform TEST VER-1. If terminals are okay, turn ignition on. Using DRB, actuate Auto Shutdown (ASD) relay.
  7. Using DRB in voltmeter mode, check voltage on ignition coil connector Dark Green/Orange wire. If voltage is less than 10 volts, repair open in Dark Green/Orange wire. Perform TEST VER-1.
  8. If voltage is more than 10 volts, check voltage on ignition coil connector Black/Gray wire (AS body) or Gray wire (AN body). If voltage is more than 10 volts, replace ignition coil. Perform TEST VER-1. If voltage is less than 10 volts, turn ignition off.
  9. Disconnect Powertrain Control Module (PCM) connector. Using DRB in ohmmeter mode, check resistance of PCM connector terminal No. 19 Black/Gray wire (AS body) or Gray wire (AN body). If resistance is less than 5 ohms, repair open in appropriate wire. Perform TEST VER-1.
  10. If resistance is more than 5 ohms, check resistance of Black/Gray wire (AS body) or Gray wire (AN body) between ignition coil connector and PCM connector terminal No. 19 using an external ohmmeter. If resistance is more than 5 ohms, repair open in appropriate wire. Perform TEST VER-1. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1.

TEST NS-2A - INSPECTING FUEL SYSTEM

WARNINGHigh fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE procedure in this article.
  1. Ensure throttle cables are not holding throttle open. If throttle is held open, repair as required. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If throttle is not held open, read Throttle Position Sensor (TPS) voltage using DRB.
  2. If voltage is less than 1.5 volts, go to next step. If voltage is more than 1.5 volts, disconnect TPS connector. Inspect terminals. Repair terminals as required. Perform TEST VER-1. If terminals are okay, replace TPS. Perform TEST VER-1.
  3. If vehicle is not equipped with a factory vehicle theft alarm, go to next step. If vehicle is equipped with a factory vehicle theft alarm, read theft alarm status using DRB. If DRB displays FUEL ON, go to next step. If DRB does not display FUEL ON, see INTRODUCTION in «TESTS W/CODES - BODY CONTROL COMPUTER»(ref-10941) article in ENGINE PERFORMANCE section.
  4. Using DRB, actuate fuel system. Listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, go to «TEST NS-5A»(ref-10881-S03415727072000111000000) . If fuel pump operation can be heard, turn ignition off.
  5. Ensure fuel tank is at least 1/4 full. Release fuel pressure. Install a fuel pressure gauge in fuel supply line. Turn ignition on. Using DRB, actuate fuel system. Observe fuel pressure gauge. See FUEL PRESSURE SPECIFICATIONS table. FUEL PRESSURE SPECIFICATIONS Application psi (kg/cm 2 ) AN Body 11.5-17.5 (.8-1.2) AS Body 34-44 (2.4-3.1)
  6. If fuel pressure is more than specification, go to «TEST NS-4B»(ref-10881-S42480398092000111000000) . If fuel pressure is less than specification, go to «TEST NS-4A»(ref-10881-S15837079442000111000000) . If fuel pressure is within specification, go to next step.
  7. Check fuel injector area for fuel flow. If fuel is flowing, go to «TEST NS-4C»(ref-10881-S33905955182000111000000) . If fuel is not flowing, go to next step.
  8. If vehicle initially started and stalled repeatedly, go to «TEST NS-7A»(ref-10881-S18130006892000111000000) . If vehicle did not initially start and stall repeatedly, go to TEST NS-3A.

TEST NS-3A - INSPECTING MECHANICAL SYSTEM

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Disconnect Manifold Absolute Pressure (MAP) sensor connector. Turn ignition on. Using DRB, check voltage on MAP sensor connector Violet/White wire. If voltage is less than 4.5 volts, repair open circuit in Violet/White wire. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) .
  2. If voltage is more than 4.5 volts, reconnect MAP sensor connector. Remove all spark plugs. Inspect spark plug tips for wet fuel. If spark plug tips are wet, clean and reinstall spark plugs. Go to next step. If spark plug tips are not wet, reinstall spark plugs. Go to next step.
  3. Inspect spark plug cables for correct placement. Reposition wires as required. Perform TEST VER-1. If spark plug cables are okay, disconnect Engine Coolant Temperature (ECT) sensor connector. Connect timing light to engine. While cranking engine, check ignition timing using timing light. If ignition timing is not 0-16 degrees BTDC, go to step 5).
  4. If ignition timing is 0-16 degrees BTDC, turn ignition off. Check valve timing. Correct valve timing as required. Perform TEST VER-1. If valve timing is okay, check engine compression. Repair as required. Perform TEST VER-1. If engine compression is okay, replace MAP sensor. Perform TEST VER-1.
  5. Attempt to set ignition timing to specification on emissions label. If ignition timing could not be set to specification, repair distributor misalignment. Perform TEST VER-1. If ignition timing could be set to specification, attempt to start engine.
  6. If engine starts, test is complete. Perform TEST VER-1. If engine did not start, turn ignition off. Check valve timing. Correct valve timing as required. Perform TEST VER-1.
  7. If valve timing is okay, check engine compression. Repair as required. Perform TEST VER-1. If engine compression is okay, replace MAP sensor. Perform TEST VER-1.

TEST NS-4A - CORRECTING FUEL DELIVERY

WARNINGHigh fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE procedure in this article.
  1. Record fuel pressure gauge reading. Turn ignition off. Release fuel pressure. Remove fuel pressure gauge. Install fuel pressure gauge between fuel tank and fuel filter. Turn ignition on.
  2. Using DRB, actuate Auto Shutdown (ASD) fuel system. Record fuel pressure gauge reading. Compare fuel pressure gauge reading with previous reading. If fuel pressure gauge reading is not at least 10 psi more than previous reading, go to step 4). If fuel pressure gauge reading is at least 10 psi more than previous reading, go to next step.
  3. Turn ignition off. Inspect fuel lines between fuel filter and fuel rail or throttle body for restriction. Repair as required. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If no restrictions are observed, replace fuel filter. Perform TEST VER-1. CAUTION: DO NOT allow fuel pressure to exceed 70 psi (4.9 kg/cm 2 ) when squeezing fuel return hose.
  4. Gently squeeze fuel return hose. Read fuel pressure gauge reading. Using DRB, stop fuel system actuation test. See FUEL PRESSURE SPECIFICATIONS table. If fuel pressure is more than minimum specification, replace fuel pressure regulator. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If fuel pressure is less than minimum specification, replace fuel pump and sock filter. Perform TEST VER-1.
ApplicationPsi (kg/cm 2 )
AN Body11.5-17.5 (.8-1.2)
AS Body34-44 (2.4-3.1)

FUEL PRESSURE SPECIFICATIONS

TEST NS-4B - CORRECTING FUEL DELIVERY

WARNINGHigh fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE procedure in this article.
  1. Ensure fuel tank is at least 1/4 full. Release fuel pressure. Turn ignition off. Disconnect fuel return hose from throttle body. Connect a 6-foot fuel hose to fuel fitting. Put other end of 6-foot hose into an approved 2-gallon or more capacity gasoline container.
  2. Turn ignition on. Using DRB, actuate fuel system. Read fuel pressure gauge reading. Using DRB, stop fuel system actuation test. See FUEL PRESSURE SPECIFICATIONS table. If fuel pressure is more than minimum specification, replace fuel pressure regulator. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If fuel pressure is less than minimum specification, go to next step. FUEL PRESSURE SPECIFICATIONS Application psi (kg/cm 2 ) AN Body 11.5-17.5 (.8-1.2) AS Body 34-44 (2.4-3.1)
  3. Turn ignition off. Reconnect fuel return hose. Remove fuel return hose from fuel tank. Connect Fuel Pressure Test Adapter (C-6541) to disconnected return hose.
  4. Put other end of hose into an approved 2-gallon or more capacity gasoline container. Turn ignition on. Using DRB, actuate fuel system. Read fuel pressure gauge. Using DRB, stop actuation test. See FUEL PRESSURE SPECIFICATIONS table.
  5. If fuel pressure is less than maximum specification, repair restricted fuel pump module. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If fuel pressure is more than maximum specification, repair restricted fuel return line between throttle body and fuel tank. Perform TEST VER-1.

TEST NS-4C - CORRECTING FUEL DELIVERY

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. If top of fuel pressure regulator is leaking, replace fuel pressure regulator. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If top of fuel pressure regulator is not leaking, turn ignition off. Remove fuel injector. Inspect fuel injector seals for damage.
  2. If seals are damaged, replace fuel injector seals. Perform TEST VER-1. If seals are not damaged, disconnect Powertrain Control Module (PCM) connector. Put DRB in ohmmeter mode.
  3. Using DRB, check resistance of PCM connector terminal No. 16 White/Dark Blue wire (AN body) or Light Blue wire (AS body). If resistance is less than 5 ohms, repair short to ground in appropriate wire. Perform TEST VER-1. If resistance is more than 5 ohms, replace fuel injector. Perform TEST VER-1.

TEST NS-5A - INSPECTING FUEL PUMP

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Using DRB, stop actuation test. If vehicle is an AN body, go to «TEST NS-5C»(ref-10881-S26256648842000111000000) . If vehicle is not an AN body, actuate Auto Shutdown (ASD) relay using DRB. Touch fuel pump relay. If fuel pump relay does not pulsate when actuated, go to TEST NS-5B. If fuel pump relay pulsates when actuated, turn ignition off.
  2. Disconnect fuel pump relay. Using DRB in voltmeter mode, check voltage on fuel pump relay connector Red/White wire (AN body) or Dark Green/White wire (AS body). If voltage is less than 10 volts, repair open circuit in appropriate wire. If voltage is more than 10 volts, install a known good relay. Attempt to start engine. If engine started, replace original relay. Perform «TEST VER-2»(ref-10881-S18660743652000111000000) .
  3. If engine did not start, install original relay. Disconnect fuel pump harness connector. Ensure fuel pump connector has clean and tight connections. Turn ignition on. Using DRB, actuate fuel system. While still actuating, put DRB in voltmeter mode. Using DRB, check voltage on fuel pump connector Dark Green/Black wire. If voltage is less than 10 volts, repair open in Dark Green/Black wire. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If voltage is more than 10 volts, stop actuation test.
  4. Using DRB in ohmmeter mode, check resistance of fuel pump connector Black wire (fuel pump ground). If resistance is more than 5 ohms, repair open in Black wire. Perform TEST VER-1. If resistance is less than 5 ohms, replace fuel pump. Perform TEST VER-1.

TEST NS-5B - INSPECTING FUEL PUMP

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Turn ignition off. Disconnect fuel pump relay. Turn ignition on. Using DRB, check voltage on fuel pump relay connector terminal "A" (Dark Blue/White wire).
  2. If voltage is less than 10 volts, repair open in appropriate wire. Perform «TEST VER-1»(ref-10881-S08865541132000111000000). If voltage is more than 10 volts, go to next step.
  3. Using an external ohmmeter, check resistance across fuel pump relay terminals. (Scheme 48) If resistance is more than 100 ohms, replace fuel pump relay. Perform TEST VER-1. If resistance is less than 100 ohms, repair open in Dark Blue/Yellow wire. Perform TEST VER-1.

Testing Fuel Pump Relay (NS-5B - 2.5L). Scheme 48

Scheme 48: Testing Fuel Pump Relay (NS-5B - 2.5L)
Scheme 48: Testing Fuel Pump Relay (NS-5B - 2.5L)

TEST NS-5C - INSPECTING FUEL PUMP

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Disconnect fuel pump connector at fuel tank. Using DRB, actuate fuel system. Using DRB, check voltage on fuel pump connector Dark Green/Black wire. If voltage is less than 10 volts, repair open in Dark Green/Black wire. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If voltage is more than 10 volts, go to next step.
  2. Turn ignition off. Using DRB in ohmmeter mode, check resistance of fuel pump connector Black wire (fuel pump ground wire). If resistance is more than 5 ohms, repair open in Black wire. Perform TEST VER-1. If resistance is less than 5 ohms, replace fuel pump. Perform TEST VER-1.

TEST NS-6A - CORRECTING NO RESPONSE CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. If vehicle starts, go to TEST NS-6B. If vehicle does not start, turn ignition off. Disconnect Throttle Position Sensor (TPS) connector. Turn ignition on. Put DRB in voltmeter mode.
  2. Using DRB, check voltage on TPS connector Violet/White wire. If voltage is less than 6 volts, go to next step. If voltage is more than 6 volts, repair open ground circuits at Powertrain Control Module (PCM) connector terminals No. 5 (Black/White wire), No. 11 (Black/Tan wire) and No. 12 (Black/Tan wire). Perform «TEST VER-1»(ref-10881-S08865541132000111000000) .
  3. If voltage is less than 4.4 volts, go to step 5). If voltage is more than 4.4 volts, reconnect TPS connector. Disconnect Manifold Absolute Pressure (MAP) sensor connector.
  4. Using DRB, check voltage on MAP sensor connector Violet/White wire. If voltage is more than 4.4 volts, go to TEST NS-6B. If voltage is less than 4.4 volts, replace TPS. Perform TEST VER-1.
  5. Disconnect MAP sensor electrical connector. Using DRB, check voltage on TPS connector Violet/White wire. If voltage is more than 4.4 volts, replace MAP sensor. Perform TEST VER-1.
  6. If voltage is less than 4.4 volts, turn ignition off. Disconnect PCM connector. Using DRB in ohmmeter mode, check resistance of PCM connector terminal No. 6 (Violet/White wire).
  7. If resistance is less than 5 ohms, repair short to ground in Violet/White wire. Perform TEST VER-1. If resistance is more than 5 ohms, using an external ohmmeter, check resistance between PCM connector terminal No. 4 (Black/Light Blue wire) and PCM connector terminal No. 6 (Violet/White wire).
  8. If resistance is less than 5 ohms, repair short to ground in Violet/White wire. If resistance is more than 5 ohms, turn ignition on. Using DRB in voltmeter mode, check voltage on PCM connector terminal No. 9 (Dark Blue wire (AN body) or Dark Blue/White wire (AS body).
  9. If voltage is less than 10 volts, repair open in Dark Blue wire (AN body) or Dark Blue/White wire (AS body) between PCM connector and ignition switch. Perform TEST VER-1. If voltage is more than 10 volts, go to next step.
  10. Using DRB, check voltage on PCM connector terminal No. 3 (Red/White wire). If voltage is more than 10 volts, replace PCM. Perform TEST VER-1. If voltage is less than 10 volts, go to next step.
  11. On AS body, go to «TEST NS-6C»(ref-10881-S02506848842000111000000) . On AN body, remove fuse "D" from Power Distribution Center (PDC). Go to next step.
  12. Inspect fuse. If fuse is blown, go to step 14). If fuse is okay, put DRB in voltmeter mode. Using DRB, check voltage on battery voltage side of PDC fuse "D".
  13. If voltage is more than 10 volts, repair open between PDC fuse "D" and PCM connector terminal No. 3. Perform TEST VER-1. If voltage is less than 10 volts, repair open in battery voltage side of PDC fuse "D". Perform TEST VER-1.
  14. Turn ignition off. Disconnect Auto Shutdown (ASD) relay. Using DRB in ohmmeter mode, check resistance of PCM connector terminal No. 3 (Red/White wire). If resistance is less than 5 ohms, repair short to ground in Red/White wire. Perform TEST VER-1. If resistance is more than 5 ohms, go to «TEST NS-6E»(ref-10881-S41320503052000111000000) .

TEST NS-6B - CORRECTING NO RESPONSE CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. If ignition was not on when NO RESPONSE message was displayed, turn ignition on to get a response. If ignition was on when NO RESPONSE message was displayed, turn ignition off.
  2. Disconnect DRB from engine diagnostic connector. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance between engine diagnostic connector Pink wire and ground.
  3. If resistance is less than 5 ohms, repair short to ground in Pink wire. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If resistance is more than 5 ohms, using an external ohmmeter, check resistance between engine diagnostic connector Light Green wire and ground.
  4. If resistance is less than 5 ohms, repair short to ground in Light Green wire. Perform TEST VER-1. If resistance is more than 5 ohms, go to next step.
  5. Using an external ohmmeter, check resistance of Pink wire between engine diagnostic connector and PCM connector terminal No. 25. If resistance is more than 5 ohms, repair open in Pink wire. Perform TEST VER-1.
  6. If resistance is less than 5 ohms, using an external ohmmeter, check resistance of Light Green wire between engine diagnostic connector and PCM connector terminal No. 45. If resistance is more than 5 ohms, repair open in Light Green wire. Perform TEST VER-1.
  7. If resistance is less than 5 ohms, connect DRB to a functional engine diagnostic connector on another vehicle. Turn ignition on. Using DRB, attempt to read trouble codes. If DRB did not display NO RESPONSE, replace PCM on initial vehicle. Perform TEST VER-1.
  8. If DRB displayed NO RESPONSE, substitute another DRB cartridge. Using DRB, attempt to read trouble codes. If DRB did not display NO RESPONSE, replace DRB cartridge. If DRB displayed NO RESPONSE, substitute another DRB adapter cable. Using DRB, attempt to read trouble codes. If DRB did not display NO RESPONSE, replace DRB adapter cable. If DRB displayed NO RESPONSE, replace DRB or cartridge.

TEST NS-6C - CORRECTING NO RESPONSE CONDITION (AS BODY ONLY)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section. TEST NS-6C applies to AS body only.

  1. Inspect ENG fuse in Power Distribution Center (PDC). Inspect fusible links. Go to next step. If fusible links or ENG fuse is not blown, repair open in PCM terminal No. 3 (Red/White wire). Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If fusible links or ENG fuse is blown, go to next step.
  2. Turn ignition off. Disconnect PCM connector. Disconnect ASD relay and fuel pump relay. Using DRB in ohmmeter mode, check resistance on PCM connector terminal No. 3 (Red/White wire). If resistance is less than 5 ohms, repair short to ground in Red/White wire. Perform TEST VER-1.
  3. If resistance is more than 5 ohms, check resistance of ASD relay connector terminal "D" (Dark Green/Orange wire) using DRB. If resistance is more than 5 ohms, go to TEST NS-6D. If resistance is less than 5 ohms, disconnect ignition coil connector. Using DRB, check resistance of ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is more than 5 ohms, replace ignition coil. Perform TEST VER-1.
  4. If resistance is less than 5 ohms, disconnect generator field connector. Using DRB, check resistance of ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is more than 5 ohms, repair short to ground in generator. Perform TEST VER-1.
  5. If resistance is less than 5 ohms, disconnect fuel injector harness connector. Using DRB, check resistance of ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is more than 5 ohms, repair short to ground in fuel injector harness. Perform TEST VER-1. If resistance is less than 5 ohms, repair short to ground in Dark Green/Orange wire between ASD relay connector and fuel injector harness. Perform TEST VER-1.

TEST NS-6D - CORRECTING NO RESP CONDITION - (AS BODY ONLY)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section. TEST NS-6D applies to AS body only.

  1. Disconnect fuel pump and oxygen sensor connectors. Using DRB, check resistance of fuel pump relay connector Dark Green/Black wire. If resistance is less than 5 ohms, repair short to ground in Dark Green/Black wire. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) .
  2. If resistance is more than 5 ohms, check resistance of oxygen sensor connector White wire (relay output wire). If resistance is less than 5 ohms, replace oxygen sensor. Perform TEST VER-1. If resistance is more than 5 ohms, replace fuel pump. Perform TEST VER-1.

TEST NS-6E - CORRECTING NO RESP CONDITION - (AN BODY ONLY)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section. TEST NS-6E applies to AN body only.

  1. Disconnect fuel pump and oxygen sensor connectors. Using DRB, check resistance of ASD relay connector Dark Green/Orange wire. If resistance is less than 5 ohms, go to step 3).
  2. If resistance is more than 5 ohms, check resistance of oxygen sensor connector White wire (relay output wire). If resistance is less than 5 ohms, replace oxygen sensor. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If resistance is more than 5 ohms, replace fuel pump. Perform TEST VER-1.
  3. Disconnect ignition coil connector. Using DRB, check resistance of ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is more than 5 ohms, replace ignition coil. Perform TEST VER-1.
  4. If resistance is less than 5 ohms, disconnect fuel injector harness connector. Using DRB, check resistance of ASD relay connector terminal "D" (Dark Green/Orange wire).
  5. If resistance is more than 5 ohms, repair short to ground in fuel injector harness. Perform TEST VER-1. If resistance is less than 5 ohms, repair short to ground in Dark Green/Orange wire between ASD relay connector and fuel injector harness. Perform TEST VER-1.

TEST NS-8A - CORRECTING START & STALL CONDITION

At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a start and stall problem. Check the following additional items as possible causes

Note. If coming to this test from O2 sensor test and rich or lean condition is not corrected after checking items listed below, replace Powertrain Control Module (PCM).

  1. Check if any technical service bulletins apply to vehicle.
  2. Check engine compression.
  3. Check for exhaust system restriction.
  4. Check camshaft and crankshaft sprockets.
  5. Check valve timing.
  6. Check for fuel contamination.
  7. Check secondary ignition system.
  8. Ensure PCV system is functioning properly.

TEST NS-9A - REPAIRING NO CRANK CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. If vehicle is equipped with a manual transmission, go to TEST NS-9B. If vehicle is equipped with an automatic transmission, ensure transmission is in Park.
  2. Using DRB, read park/neutral position switch sense. If park/neutral position switch senses park, go to next step. If park/neutral position switch does not sense park, repair open in park/neutral position switch ground.
  3. Disconnect starter relay. Using DRB in voltmeter mode, check voltage on starter relay connector Black wire (AN body), or Red/Yellow wire (AS body). If voltage is less than 10 volts, repair open in appropriate wire. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) .
  4. If voltage is more than 10 volts, using an external voltmeter, check voltage on starter relay connector Yellow wire. Hold ignition switch in RUN position while observing voltmeter. If voltage is less than 10 volts, repair open in Yellow wire. Perform TEST VER-1. WARNING: Engine may crank in following step, keep away from moving engine parts.
  5. If voltage is more than 10 volts, ensure transmission is in Park and parking brake is set. Briefly connect a jumper wire between starter relay connector Black wire (AN body), or Red/Yellow wire (AS body) and starter relay connector Brown wire. Go to «TEST NS-9C»(ref-10881-S22511256022000111000000) .

TEST NS-9B - REPAIRING NO CRANK CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. Disconnect starter relay. Using DRB in ohmmeter mode, check resistance on starter relay connector Brown/Yellow wire (AN body) or Black/Orange wire (AS body). If resistance is more than 5 ohms, repair open in appropriate wire. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) .
  2. If resistance is less than 5 ohms, put DRB in voltmeter mode. Using DRB, check voltage on starter relay connector Black wire (AN body) or Red/Yellow wire (AS body). If voltage is less than 10 volts, repair open in appropriate wire. Perform TEST VER-1.
  3. If voltage is more than 10 volts, using an external voltmeter, check voltage on starter relay connector Yellow wire. Hold ignition switch in RUN position while observing voltmeter. If voltage is less than 10 volts, repair open in Yellow wire. Perform TEST VER-1. WARNING: Engine may crank in following step, keep away from moving engine parts.
  4. If voltage is more than 10 volts, ensure transmission is in Neutral and parking brake is set. Briefly connect a jumper wire between starter relay connector Black wire (AN body), or Red/Yellow wire (AS body) and starter relay connector Brown wire. Go to TEST NS-9C.

TEST NS-9C - REPAIRING NO CRANK CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS section.

  1. If engine cranked, replace starter relay. Perform «TEST VER-1»(ref-10881-S08865541132000111000000) . If engine did not crank, disconnect jumper wire. Note if starter solenoid clicked when jumper wire was connected. Disconnect starter relay Brown wire from starter solenoid.
  2. Using an external ohmmeter, check resistance of Brown wire between starter relay connector and starter solenoid. If resistance is more than 5 ohms, repair open in Brown wire. Perform TEST VER-1. If resistance is less than 5 ohms, reinstall starter relay.
  3. Check battery cables for high resistance. If either battery circuit had a voltage drop of more than .2 volt, repair battery circuit for high resistance. Perform TEST VER-1. If voltage drop for either battery circuit is less than .2 volt, go to next step.
  4. If starter solenoid clicked when jumper wire was connected in step 1), repair starter for a mechanical failure. Perform TEST VER-1. If starter solenoid did not click when jumper wire was connected in step 1), replace starter solenoid. Perform TEST VER-1.

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