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Engine Controls Self-Diagnostics - Tests - Pathfinder & QX4: Other Nissan Pathfinder II

Testing & Diagnostics 32 illustrations ~11426 words

Procedure

  1. If malfunction "A" or "C" was duplicated, go to next step. If malfunction "B" or "D" was duplicated, inspect air intake duct and vacuum hoses for disconnection or leaks. Reconnect or repair as necessary. Go to next step.
  2. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 6) Disconnect MAF sensor harness connector. (Scheme 7) Turn ignition on. Measure voltage between MAF sensor harness connector terminal No. 3 (Black/White wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  3. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Black wire between MAF sensor harness connector terminal No. 2 and PCM harness connector terminal No. 55. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  4. Check continuity of White wire between MAF sensor harness connector terminal No. 1 and PCM harness connector terminal No. 54. If continuity exists, go to next step. If continuity does not exist, repair open in White wire.
  5. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and PCM harness connector terminal No. 54 by backprobing. see scheme 2 See «MASS AIRFLOW SENSOR VOLTAGE»(ref-91142-S20126285542001030200000) table.
  6. If voltage is as specified, go to next step. If voltage is not as specified, disconnect and reconnect MAF sensor harness connector. Repeat step 5. If voltage is still not as specified, check for dust or foreign material in hot wire air passage of MAF sensor. If air passage is okay, replace mass airflow sensor and retest system.
  7. Check shield circuit for continuity to ground. Shield is connected to ground through connector F-21 (Blue, 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
ConditionVolts
Key On, Engine OffLess Than 1.0
Engine Idling1.0-1.7
2500 RPM1.7-2.3
Idle To 4000 RPM(1) 1.0-1.7 To About 4.0
(1) Voltage should increase in proportion to engine speed.
(1)Voltage should increase in proportion to engine speed.

MASS AIRFLOW SENSOR VOLTAGE

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Procedure "A"

  1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 6) Disconnect AP sensor harness connector. (Scheme 7) Turn ignition on. Measure voltage between AP sensor harness connector Pink/Black wire and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Pink/Black wire.
  2. Turn ignition off. Check continuity between AP sensor harness connector Black wire and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  3. Disconnect PCM harness connector. see scheme 1 Check continuity of Green/White wire between PCM harness connector terminal No. 45 and AP sensor harness connector. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Green/White wire.
  4. Reconnect all harness connectors. Remove AP sensor from its bracket and disconnect vacuum hose. Turn ignition on. Measure voltage between PCM harness connector terminal No. 45 and ground by backprobing. Voltage should be 3.2-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg of vacuum to AP sensor. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. (Scheme 8) If voltage is not as specified, replace AP sensor. If voltage is as specified, go to next step.
  5. Check shield circuit for continuity to ground. Shield is connected to ground through connector F-21 (Blue, 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 8

Scheme 8
Scheme 8

Procedure "B"

  1. Warm engine to normal operating temperature. Turn ignition off. Connect a vacuum gauge using a vacuum "T" to AP sensor hose. While monitoring vacuum gauge, start engine and let it idle. Vacuum should not exist for 5 seconds. Manifold vacuum should exist after 5 seconds. If vacuum is as specified, go to step 3. If manifold vacuum is not as specified, go to next step.
  2. Check vacuum supply to MAP/BARO solenoid. Repair as necessary. If vacuum supply is okay, check MAP/BARO solenoid. See «DTC P1105: MANIFOLD ABSOLUTE PRESSURE (MAP)/BAROMETRIC PRESSURE (BARO) SOLENOID»(ref-91142-S31745763262001030200000). Replace MAP/BARO solenoid, if necessary. If MAP/BARO solenoid is okay, check intake system for air leaks. Repair as necessary.
  3. Turn ignition off. Inspect vacuum hose between AP sensor and MAP/BARO solenoid for clogging or leaks. Repair as necessary. If vacuum hose is okay, inspect AP sensor harness connector for water. Repair or replace, if necessary. If connector is okay, go to next step.
  4. Remove AP sensor from its bracket and disconnect vacuum hose. Turn ignition on. Measure voltage between PCM harness connector terminal No. 45 and ground by backprobing. Voltage should be 3.2-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg of vacuum to AP sensor. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. (Scheme 8) If voltage is not as specified, replace AP sensor. If voltage is as specified, go to next step.
  5. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect IAT sensor harness connector. (Scheme 9) Turn ignition on. Measure voltage between IAT sensor harness connector Yellow/Blue wire and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Yellow/Blue wire between PCM and IAT sensor.
  2. Turn ignition off. Check continuity between IAT sensor harness connector Black wire and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire. See appropriate diagram in WIRING DIAGRAMS article.
  3. Leave IAT sensor disconnected. Measure resistance between IAT sensor terminals. Resistance should decrease as temperature increases. (Scheme 10) If resistance is not as specified, replace IAT sensor. If resistance is as specified, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10
  1. Turn ignition off. Disconnect ECT sensor harness connector. (Scheme 11) Turn ignition on. Measure voltage between ECT sensor harness connector Light Green/Red wire and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Light Green/Red wire between PCM and ECT sensor.
  2. Turn ignition off. Check continuity between ECT sensor harness connector Black wire and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  3. Leave ECT sensor disconnected. Measure resistance between sensor terminals. Resistance should decrease as temperature increases. (Scheme 10) If resistance is not as specified, replace ECT sensor. If resistance is as specified, go to next step.
  4. If DTC P0115 is present, go to next step. If DTC P0125 is present, allow engine to cool until coolant temperature is less than 158°F (70°C). Grasp lower radiator hose. If coolant is flowing through lower radiator hose, check for stuck open thermostat. If coolant is not flowing through lower radiator hose, go to next step.
  5. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 11

Scheme 11
Scheme 11
  1. If malfunction "A" or "B" was duplicated, go to next step. If malfunction "C" was duplicated, adjust TP sensor. See ON-VEHICLE ADJUSTMENTS article. Check air intake duct and vacuum hoses for leaks or disconnection. Reconnect or repair as necessary. Go to next step.
  2. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 6) Disconnect TP sensor harness connector. (Scheme 12) Turn ignition on. Measure voltage between TP sensor harness connector Pink/Black wire and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between PCM and TP sensor.
  3. Turn ignition off. Check continuity of Black wire between TP sensor harness connector and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire. See appropriate diagram in WIRING DIAGRAMS article.
  4. Disconnect PCM harness connector. see scheme 1 Check continuity of White wire between PCM harness connector terminal No. 23 and TP sensor harness connector. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in White wire between PCM and TP sensor.
  5. Measure resistance between TP sensor terminals No. 2 and 3 with throttle in specified position. See «THROTTLE POSITION (TP) SENSOR RESISTANCE»(ref-91142-S37001900982001030200000) table. (Scheme 12) If resistance is as specified, go to next step. If resistance is not as specified, replace TP sensor.
  6. Check MAF sensor. See «DTC P0100: MASS AIRFLOW (MAF) SENSOR»(ref-91142-S37413540582001030200000). Replace, if necessary. If MAF sensor is okay, check CMP sensor. See «DTC P0340: CAMSHAFT POSITION (CMP) SENSOR»(ref-91142-S28222703072001030200000). Replace, if necessary. If CMP sensor is okay, go to next step.
  7. Check fuel injectors and circuits. See FUEL CONTROL in SYSTEM & COMPONENT TESTING article. Repair or replace as necessary. If fuel injectors and circuits are okay, go to next step.
  8. Check shield circuit for continuity to ground. Shield is connected to ground through connector F-21 (Blue, 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Throttle PositionOhms @ 77°F (25°C)
Fully ClosedAbout 500
Partially Open500-4000
Fully OpenAbout 4000

THROTTLE POSITION SENSOR RESISTANCE

Scheme 12

Scheme 12
Scheme 12
  1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 6) Disconnect appropriate front HO2S harness connector and PCM harness connector. see scheme 1 Check continuity of White wire between right front HO2S harness connector and PCM harness connector terminal No. 50, or between left front HO2S harness connector and PCM harness connector terminal No. 51. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in White wire.
  2. Check continuity between ground and appropriate front HO2S harness connector White wire. If continuity exists, repair short to ground. If continuity does not exist, reconnect all harness connectors and go to next step.
  3. Start engine and warm to normal operating temperature. Measure voltage between ground and PCM harness connector terminal No. 50 (right bank) or No. 51 (left bank) by backprobing. Increase engine speed to 2000 RPM. The following conditions should exist: MIL goes on more than 5 times in 10 seconds when PCM is in Diagnostic Test Mode II. Measured voltage should be more than.60 volt at least once. Measured voltage should be less than.35 volt at least once. Measured voltage should not exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace front HO2S.
  4. Check shield circuit for continuity to ground. Shield is connected to ground through connector F-21 (Blue, 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Loosen and retighten engine ground screws. (Scheme 6) Loosen and retighten front HO2S. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect Mass Airflow (MAF) sensor harness connector. (Scheme 7) Start engine and let idle for at least 5 seconds. Turn ignition off and reconnect MAF sensor harness connector.
  2. Ensure DTC P0100 is set. Clear DTCs. Start engine and let idle for at least 10 minutes. Recheck for DTCs. If DTC P0171, P0172, P0174 or P0175 is present and engine is hard to start, perform diagnosis for DTC P0171, P0172, P0174 or P0175. See «DTC P0171, P0172, P0174 OR P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-91142-S24040355182001030200000). If DTC P0171, P0172, P0174 or P0175 is not present and engine is not hard to start, go to next step.
  3. Disconnect appropriate front HO2S harness connector. Inspect connector for water. Repair or replace, if necessary. If connector is okay, measure resistance between HO2S outer terminals. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between both outer HO2S terminals and center terminal. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace HO2S.
  4. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and PCM harness connector terminal No. 50 (right bank) or No. 51 (left bank) by backprobing. see scheme 2 Increase engine speed to 2000 RPM. The following conditions should exist: MIL goes on more than 5 times in 10 seconds when PCM is in Diagnostic Test Mode II. Measured voltage should be more than.60 volt at least once. Measured voltage should be less than.35 volt at least once. Measured voltage should not exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace front HO2S.
  5. Check shield circuit for continuity to ground. Shield is connected to ground through connector F-21 (Blue, 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 6) Loosen and retighten front HO2S. Start engine and check for exhaust leak before catalyst. Also check for air intake leak after Mass Airflow (MAF) sensor. Repair as necessary. If no leaks are found, go to next step.
  2. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 7) Start engine and let idle for at least 5 seconds. Turn ignition off and reconnect MAF sensor harness connector.
  3. Ensure DTC P0100 is set. Clear DTCs. Start engine and let idle for at least 10 minutes. Recheck for DTCs. If DTC P0171, P0172, P0174 or P0175 is present and engine is hard to start, perform diagnosis for DTC P0171 P0172, P0174 or P0175. See «DTC P0171, P0172, P0174 OR P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-91142-S24040355182001030200000). If DTC P0171, P0172, P0174 or P0175 is not present and engine is not hard to start, go to next step.
  4. Disconnect appropriate front HO2S and PCM harness connectors. see scheme 1 Check continuity of White wire between right front HO2S harness connector and PCM harness connector terminal No. 50, or between left front HO2S harness connector and PCM harness connector terminal No. 51. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in White wire.
  5. Check continuity between ground and appropriate front HO2S harness connector White wire. If continuity exists, repair short to ground. If continuity does not exist, go to next step.
  6. Measure resistance between appropriate HO2S outer terminals. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between both outer HO2S terminals and center terminal. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace HO2S.
  7. Check MAF sensor. See «DTC P0100: MASS AIRFLOW (MAF) SENSOR»(ref-91142-S37413540582001030200000). Replace, if necessary. If MAF sensor is okay, check PCV valve. See SYSTEM & COMPONENT TESTING article. Replace, if necessary. If PCV valve is okay, go to next step.
  8. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and PCM harness connector terminal No. 50 (right bank) or No. 51 (left bank) by backprobing. see scheme 2 Increase engine speed to 2000 RPM. The following conditions should exist: MIL goes on more than 5 times in 10 seconds when PCM is in Diagnostic Test Mode II. Measured voltage should be more than.6 volt at least once. Measured voltage should be less than.3 volt at least once. Measured voltage should not exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace front HO2S.
  9. Check shield circuit for continuity to ground. Shield is connected to ground through connector F-21 (Blue, 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Loosen and retighten front HO2S. Disconnect front HO2S and PCM harness connectors. see scheme 1 Check continuity of White wire between right front HO2S harness connector and PCM harness connector terminal No. 50, or between left front HO2S harness connector and PCM harness connector terminal No. 51. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in White wire.
  2. Check continuity between ground and appropriate front HO2S harness connector White wire. If continuity exists, repair short to ground. If continuity does not exist, go to next step.
  3. Inspect HO2S harness connector for water. Repair or replace, if necessary. If connector is okay, reconnect front HO2S harness connector. Start engine and warm to normal operating temperature. Measure voltage between ground and PCM harness connector terminal No. 50 (right bank) or No. 51 (left bank) by backprobing. see scheme 2 Increase engine speed to 2000 RPM. The following conditions should exist: MIL goes on more than 5 times in 10 seconds when PCM is in Diagnostic Test Mode II. Measured voltage should be more than.6 volt at least once. Measured voltage should be less than.3 volt at least once. Measured voltage should not exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace front HO2S.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect appropriate front HO2S harness connector. Turn ignition on. Measure voltage between front HO2S harness connector Black/White wire and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Purple wire between PCM harness connector terminal No. 119 and right front HO2S harness connector, or Purple/White wire between PCM harness connector terminal No. 121 and left front HO2S harness connector. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open circuit.
  3. Turn ignition off. Measure resistance between HO2S outer terminals. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between both outer HO2S terminals and center terminal. Continuity should not exist. If HO2S does not test as specified, replace HO2S. If HO2S is okay, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 6) If diagnosing for DTC P0140 or P0160, go to step 3. If diagnosing for DTC P0137, P0138, P0139, P0157, P0158 or P0159, start engine and warm to normal operating temperature. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 7) Start engine and let idle for at least 5 seconds. Turn ignition off and reconnect MAF sensor harness connector.
  2. Ensure DTC P0100 is set. Clear DTCs. Start engine and let idle for at least 10 minutes. Recheck for DTCs. If DTC P0171, P0172, P0174 or P0175 is present and engine is hard to start, perform diagnosis for those DTCs first. See «DTC P0171, P0172, P0174 OR P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-91142-S24040355182001030200000). If DTC P0171, P0172, P0174 or P0175 is not present and engine is not hard to start, go to next step.
  3. Turn ignition off. Disconnect appropriate rear HO2S and PCM harness connectors. see scheme 1 Inspect connector for water. Repair or replace, if necessary. If connector is okay, check continuity of Blue/White wire between PCM harness connector terminal No. 56 and right rear HO2S harness connector, or White wire between PCM harness connector terminal No. 57 and left rear HO2S harness connector. see scheme 2 If continuity does not exist, repair open circuit. If continuity exists, go to next step.
  4. Check continuity between ground and right rear HO2S harness connector Blue/White wire, or left rear HO2S harness connector White wire. If continuity exists, repair short to ground. If continuity does not exist, check continuity between ground and appropriate rear HO2S harness connector Black wire. If continuity exists, go to next step. If continuity does not exist, repair open ground circuit. See appropriate diagram in WIRING DIAGRAMS article.
  5. Reconnect all harness connectors. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle and leave engine running. Measure voltage between ground and PCM harness connector terminal No. 56 (right bank) or No. 57 (left bank) by backprobing. While observing voltage, quickly increase engine speed to 4000 RPM under no load at least 10 times. If voltage increases to more than.56 volt at least one time, go to step 7. If voltage does not increase to more than.56 volt, go to next step.
  6. Idle engine for 10 minutes and recheck voltage. If voltage does not decrease to less than.54 volt at least once, drive vehicle and coast from 50 MPH with transmission in 3rd gear (M/T) or with overdrive turned off (A/T). If voltage still does not decrease to less than.54 volt at least one time, replace HO2S and retest system. If voltage drops less than.54 volt at least once, go to next step.
  7. Check shield circuit for continuity to ground. Shield is connected to ground through connector F-21 (Blue, 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect appropriate rear HO2S harness connector. Turn ignition on. Measure voltage between rear HO2S harness connector terminal No. 3 (Black/White wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Purple/Green wire between right rear HO2S harness connector terminal No. 2 and PCM harness connector terminal No. 122, or Purple/Red wire between left rear HO2S harness connector terminal No. 2 and PCM harness connector terminal No. 123. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open circuit.
  3. Leave rear HO2S wiring harness disconnected. Measure resistance between HO2S terminals No. 2 (Red/Black wire on right bank; Red/Yellow wire on left bank) and No. 3 (Orange/Black wire). Resistance should be 2.3-4.3 ohms at 77°F (25°C). Continuity should not exist between any other HO2S terminals. If resistance and continuity are as specified, go to next step. If resistance and continuity are not as specified, replace HO2S.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Start engine and run at idle. Check for leaks in exhaust system before 3-way catalyst. Check for leaks in intake system after MAF sensor. Repair or replace faulty components as required. If no leaks are detected, go to next step.
  2. Turn ignition off. Disconnect appropriate front HO2S harness connector and PCM harness connector. see scheme 1 Check continuity of White wire between PCM harness connector terminal No. 50 and right front HO2S harness connector, or between PCM harness connector terminal No. 51 and left front HO2S harness connector. see scheme 2 If continuity does not exist, repair open in White wire. If continuity exists, check continuity between ground and appropriate front HO2S harness connector White wire. If continuity does not exist, go to next step. If continuity exists, repair short to ground.
  3. Check fuel pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pressure is not okay, check fuel pump, fuel pressure regulator and fuel lines. Repair as necessary. If fuel pressure is okay, check MAF sensor. See «DTC P0100: MASS AIRFLOW (MAF) SENSOR»(ref-91142-S37413540582001030200000). Repair as necessary. If MAF sensor is okay, go to next step.
  4. With engine idling, listen to each injector for clicking noise. If any injector does not click, repair circuit or replace injector. If all injectors click, turn ignition off and allow engine to cool. Ensure no fire hazards exist and remove injector assembly with fuel lines and harness connectors connected. Place a suitable cup under each injector to collect fuel. Disconnect all ignition coil harness connectors. Turn ignition on. Verify fuel is not dripping from injectors. Replace injectors which are leaking. Crank engine for 3 seconds and ensure each injector sprays fuel. If injectors are okay, go to next step.
  5. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect TFT sensor harness connector, located behind access panel under rear seat. Turn ignition on. Measure voltage between TFT sensor harness connector Light Green/Black wire and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Light Green/Black wire.
  2. Turn ignition off. Check continuity between TFT harness connector Black wire and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  3. Remove TFT sensor. Measure resistance between sensor terminals. At 68°F (20°C), resistance should be 2300-2700 ohms. At 122°F (50°C), resistance should be 790-900 ohms. Resistance should decrease as temperature increases. (Scheme 10) If resistance is not as specified, replace TFT sensor. If resistance is as specified, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Start engine and run at idle. Check for intake leaks. Stop engine and visually inspect exhaust system, 3-way catalyst and muffler for damage. If a problem is detected, repair as necessary. If no problems are detected, check EGR operation. See «DTC P1402: EGR FUNCTION»(ref-91142-S18368435352001030200000) . Repair as necessary. If no faults are detected, go to next step.
  2. Start engine and allow to idle. Individually, disconnect fuel injector harness connectors. If engine speed momentarily drops, go to step 4 . If engine speed does not momentarily drop, check appropriate fuel injector. See SYSTEM & COMPONENT TESTING article. Injector should be rapidly clicking at engine idle speed. If no sound is detected, check injector harness for open or short and check injector for proper operation. If no faults are detected, go to next step.
  3. Disconnect ignition wire from spark plug. Connect a known-good spark plug. Place end of spark plug against a suitable ground and crank engine. If no spark is detected, check ignition wires for defects and repair as necessary. Check ignition coil, power transistor and related circuits. See «DTC P1320: IGNITION SIGNAL»(ref-91142-S19638605412001030200000) . If spark is detected, go to next step.
  4. Remove spark plugs. Inspect spark plugs for proper gap, fouling or damage. Replace spark plugs as necessary. Check cylinder compression. See BASIC DIAGNOSTIC PROCEDURES article. If compression is not within specifications, check pistons, rings and valves. If compression is okay, check fuel pressure. If fuel pressure is not within specifications, check fuel pump and related circuits. Check ignition timing and adjust as necessary. Go to next step.
  5. Check front HO2S. See appropriate DTC test for front HO2S. Replace, if necessary. If front HO2S is okay, check MAF sensor. See «DTC P0100: MASS AIRFLOW (MAF) SENSOR»(ref-91142-S37413540582001030200000) . Replace MAF sensor or repair circuit, if necessary. If MAF sensor and circuit are okay, go to next step.
  6. See TROUBLE SHOOTING - NO CODES article for diagnosis by symptom. Repair as necessary. Some tests may cause a DTC to set. Clear DTCs. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Measure resistance between ground and PCM harness connector terminal No. 64. see scheme 2 Resistance should be about 500-620 k/ohms at 77°F (25°C). If resistance is as specified, go to step 3. If resistance is not as specified, go to next step.
  2. Disconnect knock sensor harness connector, located near injector No. 5 harness connector. Check for open or short in White wire between knock sensor harness connector and PCM harness connector terminal No. 64. Repair as necessary. If circuit is okay, measure resistance between ground and knock sensor White wire terminal. Resistance should be about 500-620 k/ohms at 77°F (25°C). If resistance is not as specified, replace knock sensor. See «KNOCK SENSOR»(ref-91150-S24538686772005092100000). If resistance is as specified, go to next step.
  3. Loosen and retighten engine ground bolts. (Scheme 6) Disconnect connector F-6. (Scheme 13) Check continuity between ground and connector F-6 terminal No. 6. (Scheme 14) If continuity exists, go to next step. If continuity does not exist, repair open ground circuit. See appropriate diagram in WIRING DIAGRAMS article.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 13

Scheme 13
Scheme 13

Scheme 14

Scheme 14
Scheme 14
  1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 6) Disconnect CKP sensor harness connector, located on left upper side of flywheel housing. Disconnect PCM harness connector. see scheme 1 Check continuity of Blue wire between CKP sensor harness connector and PCM harness connector terminal No. 47. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Blue wire.
  2. Reconnect PCM harness connector. Check continuity between ground and CKP sensor harness connector Black/White wire. If continuity does not exist, repair open in Black/White wire. If continuity exists, loosen and retighten CKP sensor mounting bolt and retest. If problem still exists, go to next step.
  3. Remove CKP sensor. Inspect CKP sensor for physical damage. Measure resistance between CKP sensor terminals. Resistance should be about 166.5-203.5 ohms at 68°F (20°C). Replace CKP sensor, if damaged or if resistance is not as specified. If CKP sensor is okay, go to next step.
  4. Check shield circuit for continuity to ground. Shield is connected to ground through connector F-21 (Blue, 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, go to next step.
  5. Inspect flywheel or drive plate teeth for damage. Replace flywheel or drive plate, if necessary. If flywheel or drive plate is okay, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 6) Disconnect CMP sensor harness connector (6-pin harness connector on distributor). Turn ignition on. Measure voltage between ground and CMP sensor harness connector terminal No. 5 (Black/White wire). (Scheme 15) If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Blue wire between CMP sensor harness connector terminal No. 3 and PCM harness connector terminals No. 44 and 48. see scheme 2and (Scheme 15). Also check continuity of Black/White wire between CMP sensor harness connector terminal No. 4 and PCM harness connector terminal No. 49. If continuity exists, go to next step. If continuity does not exist, repair open circuit(s).
  3. Check continuity between ground and CMP sensor harness connector terminal No. 6 (Black wire). If continuity exists, go to next step. If continuity does not exist, repair open ground circuit.
  4. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and PCM harness connector terminals No. 44, 48 and 49 with engine at specified RPM. See PIN VOLTAGE CHARTS article. If voltage is as specified, go to next step. If voltage is not as specified, replace distributor assembly.
  5. Check shield circuit for continuity to ground. Shield is connected to ground through connector F-21 (Blue, 12-pin joint connector located near PCM). See appropriate diagram in WIRING DIAGRAMS article. If continuity does not exist, repair open circuit. If continuity exists, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 15

Scheme 15
Scheme 15
  1. Check exhaust system for leaks. Repair as necessary. If no leaks are found, start engine and warm to normal operating temperature. Disconnect vacuum hose from EGR valve. Check for vacuum at hose. Vacuum should not exist at idle. Check for vacuum while quickly increasing engine speed to 3000 RPM. Vacuum should exist while increasing engine speed. If vacuum is as specified, go to next step. If vacuum is not as specified, go to step 3.
  2. Turn ignition off. Remove EGR valve. Using a hand vacuum pump, apply vacuum to EGR valve. EGR valve should open. If EGR valve opens, test is complete. If EGR valve does not open, check for sticking and clean or repair as necessary. Replace EGR valve, if it is not sticking.
  3. Inspect vacuum hose for blockage, leak or misconnection. Repair as necessary. If vacuum hose is okay, turn ignition off. Disconnect PCM harness connector. see scheme 1 Turn ignition on. Connect a jumper wire between ground and PCM harness connector terminal No. 103. see scheme 2 Listen for EGRC solenoid operating sound while disconnecting and connecting jumper wire. If operating sound is heard, go to next step. If operating sound is not heard, repair EGRC solenoid or circuit. See «DTC P1400: EGR CONTROL (EGRC) SOLENOID»(ref-91142-S31925370602001030200000).
  4. Check EGRC solenoid. See «DTC P1400: EGR CONTROL (EGRC) SOLENOID»(ref-91142-S31925370602001030200000). Replace, if necessary. If EGRC solenoid is okay, check EGRC-BPT. See «DTC P0402: EGR CONTROL BACKPRESSURE TRANSDUCER (EGRC-BPT)»(ref-91142-S35323968392001030200000). Replace, if necessary. If EGRC-BPT is okay, check EGR temperature sensor. See «DTC P1401: EGR TEMPERATURE SENSOR»(ref-91142-S15856556832001030200000). Replace, if necessary. If EGR temperature sensor is okay, go to next step.
  5. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Check EGR system vacuum hoses for blockage, leaks or misconnection. Repair as necessary. If vacuum hoses are okay, check for restricted exhaust. Repair as necessary. If exhaust system is okay, ensure orifice is installed in vacuum hose between EGRC-BPT and EGRC solenoid. Go to next step.
  2. Remove EGRC-BPT. Plug one vacuum port and apply vacuum to other vacuum port. Vacuum should not hold. Apply 3.94 in. H 2 O of pressure to backpressure port. Vacuum should hold. Replace EGRC-BPT if it does not operate as specified. If EGRC-BPT is okay, go to next step.
  3. Check CMP sensor. See «DTC P0340: CAMSHAFT POSITION (CMP) SENSOR»(ref-91142-S28222703072001030200000) . Replace, if necessary. If CMP sensor is okay, check MAF sensor. See «DTC P0100: MASS AIRFLOW (MAF) SENSOR»(ref-91142-S37413540582001030200000) . Replace, if necessary. If MAF sensor is okay, check EGRC solenoid. See «DTC P1400: EGR CONTROL (EGRC) SOLENOID»(ref-91142-S31925370602001030200000) . Replace, if necessary. If EGRC solenoid is okay, go to next step.
  4. Remove EGR valve. Using a hand vacuum pump, apply vacuum to EGR valve. EGR valve should open. If EGR valve does not open, check for sticking. Clean or repair as necessary. Replace EGR valve, if it did not open and is not sticking. If EGR valve opens, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Inspect exhaust system for damage and repair as necessary. Start engine and run at idle. Check for exhaust leak before 3-way catalyst. Check for intake air leak after MAF sensor. Repair or replace faulty components as required. If no leaks are detected, go to next step.
  2. Check ignition timing. See ON-VEHICLE ADJUSTMENTS article. Adjust as necessary. If ignition timing is okay, turn engine off and turn ignition on. Measure voltage between ground and PCM harness connector terminals No. 102, 104, 106, 109, 111 and 113 by backprobing. see scheme 2 If battery voltage exists, go to next step. If battery voltage does not exist, repair appropriate injector or circuit. See SYSTEM & COMPONENT TESTING article.
  3. Turn ignition off. Disconnect ignition wires from spark plugs individually and connect a known-good spark plug to wire. Place spark plug on good ground. Crank engine and check for spark. If spark exists at every plug wire, go to next step. If spark does not exist every plug wire, check and repair spark plug wires, ignition coil and power transistor as necessary. See «DTC P1320: IGNITION SIGNAL»(ref-91142-S19638605412001030200000).
  4. Turn ignition off. Remove injector assembly. Keep all associated fuel lines connected. Disconnect CMP sensor harness connector. Turn ignition on. Verify fuel is not dripping from injectors. Replace injectors which are leaking. If no injectors are faulty, go to next step.
  5. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. If DTC still exists, replace warm-up 3-way catalyst.

Using MIL

  1. Drive vehicle according to specified driving pattern to set System Readiness Test (SRT) codes. See SYSTEM READINESS TEST (SRT) CODES under ADDITIONAL SYSTEM FEATURES in SELF-DIAGNOSTICS - INTRODUCTION article. Turn ignition off and wait at least 5 seconds.
  2. Perform step 1 again. Turn ignition on and retrieve DTCs using MIL. See SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Ensure fuel cap is original equipment. Remove fuel cap. If air releasing sound was heard while removing fuel cap, go to next step. If air releasing sound was not heard while removing fuel cap, and fuel cap was not tightened properly, clean fuel cap and filler neck with compressed air and reinstall cap. If fuel cap was installed properly, check fuel cap vacuum release valve opening pressure and vacuum. Valve should open when pressure reaches 2.22-2.90 psi (15.3-20.0 kg/cm 2 ) and when vacuum reaches 0.98-1.77 in. Hg. Replace fuel cap, if necessary. If fuel cap is okay, go to next step.
  2. Check EVAP system for leaks. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. Repair, if necessary. If no leaks are found, check for blockage in water separator. See VACUUM DIAGRAMS article for location. Replace, if necessary. If water separator is okay, check EVAP-CVCV. See «DTC P0446: EVAP CANISTER VENT CONTROL VALVE (EVAP-CVCV)»(ref-91142-S36435603342001030200000) . Replace, if necessary. If EVAP-CVCV is okay, go to next step.
  3. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to next step. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is less than 4.0 lbs. (1.8 kg), go to next step. If weight is more than 4.0 lbs. (1.8 kg), inspect EVAP canister for damage and check hose between water separator and EVAP canister for blockage or leak. Repair hose or replace EVAP canister, if necessary. If EVAP canister and hose are okay go to next step.
  4. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect purge hose from EVAP-CPVCV (on EVAP service port side). See VACUUM DIAGRAMS article for location. Install vacuum gauge to EVAP-CPVCV. Start engine and let idle for at least 80 seconds. Increase engine speed to 2000 RPM, and observe vacuum gauge. If vacuum exists, go to step 6 . If vacuum does not exist, go to next step.
  5. Check vacuum hoses to EVAP-CPVCV for blockage or leak. Repair as necessary and retest system. If vacuum hoses are okay, check EVAP-CPVCV. See «DTC P0443: EVAP CANISTER PURGE VOLUME CONTROL VALVE (EVAP-CPVCV)»(ref-91142-S36984932882001030200000) . Replace, if necessary. If EVAP-CPVCV is okay, go to next step.
  6. Check AP sensor. See «DTC P0105: ABSOLUTE PRESSURE (AP) SENSOR»(ref-91142-S26611741842001030200000) . Replace AP sensor, if necessary. If AP sensor is okay, check MAP/BARO solenoid. See «DTC P1105: MANIFOLD ABSOLUTE PRESSURE (MAP)/BAROMETRIC PRESSURE (BARO) SOLENOID»(ref-91142-S31745763262001030200000) . Replace, if necessary. If MAP/BARO solenoid is okay, go to next step.
  7. Check TFT sensor. See «DTC P0180: TANK FUEL TEMPERATURE (TFT) SENSOR»(ref-91142-S34838411062001030200000) . Replace, if necessary. If TFT sensor is okay, check EVAP-CSPS. See «DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR (EVAP-CSPS)»(ref-91142-S11019582672001030200000) . Replace, if necessary. If EVAP-CSPS is okay, go to next step.
  8. Check for leaks in EVAP purge line. See VACUUM DIAGRAMS article. Repair as necessary. If no leaks are found, clean purge line with compressed air and retest system. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect EVAP-CPVCV harness connector. (Scheme 16) Measure voltage between ground and EVAP-CPVCV harness connector Black/White wire. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Light Green/Black wire between EVAP-CPVCV harness connector and PCM harness connector terminal No. 5. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Light Green/Black wire.
  3. Remove EVAP-CPVCV. Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. (Scheme 17) Check for airflow between ports "A" and "B". Air should flow. Remove jumper wires. Air should not flow. EVAP-CPVCV should switch in one second or less. Replace EVAP-CPVCV, if operation is not as specified. If EVAP-CPVCV is okay, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 16

Scheme 16
Scheme 16

Scheme 17

Scheme 17
Scheme 17
  1. Turn ignition off. Disconnect EVAP-CVCV harness connector. (Scheme 18) Turn ignition on. Measure voltage between EVAP-CVCV harness connector Black/White wire and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Green/Red wire between EVAP-CVCV harness connector and PCM harness connector terminal No. 108. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Green/Red wire.
  3. Remove EVAP-CVCV. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 19) Check for airflow between ports "A" and "B". Air should not flow. Remove jumper wires. Air should flow between ports "A" and "B". EVAP-CVCV should switch in one second or less. Replace EVAP-CVCV, if operation is not as specified. If EVAP-CVCV is okay, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 18

Scheme 18
Scheme 18

Scheme 19

Scheme 19
Scheme 19
  1. Check EVAP-CSPS hose for blockage or leak. (Scheme 20) Repair as necessary and retest system. If hose is okay, loosen and retighten engine ground bolts. (Scheme 6) Disconnect EVAP-CSPS harness connector. If water exists in connector, repair or replace connector and retest system. If connector is okay, go to next step.
  2. Turn ignition on. Measure voltage between ground and EVAP-CSPS harness connector Pink/Black wire. If voltage is not about 5 volts, repair open or short in Pink/Black wire. If voltage is about 5 volts, turn ignition off. Check continuity between ground and EVAP-CSPS harness connector Black wire. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  3. Disconnect PCM harness connector. see scheme 1 Check continuity between EVAP control system pressure sensor harness connector Green wire (on QX4), or Green/Black wire (on Pathfinder) and PCM harness connector terminal No. 62 (Green/Black wire). see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open circuit.
  4. Check EVAP-CPVCV. See «DTC P0443: EVAP CANISTER PURGE VOLUME CONTROL VALVE (EVAP-CPVCV)»(ref-91142-S36984932882001030200000). Replace as necessary and retest system. If EVAP-CPVCV is okay, check EVAP-CVCV. See «DTC P0446: EVAP CANISTER VENT CONTROL VALVE (EVAP-CVCV)»(ref-91142-S36435603342001030200000). Replace as necessary and retest system. If EVAP-CVCV is okay, go to next step.
  5. Remove EVAP-CSPS with harness connector connected. Disconnect hose from EVAP-CSPS. Using a hand vacuum pump, apply vacuum to EVAP-CSPS. Measure voltage between ground and PCM harness connector terminal No. 62 by backprobing with vacuum as specified. see scheme 2 See «EVAP CONTROL SYSTEM PRESSURE SENSOR VOLTAGE»(ref-91142-S12332664422001030200000) table. Replace EVAP-CSPS, if voltage is not as specified. If voltage is as specified, go to next step.
  6. Check for blockage in water separator and EVAP-CVCV hose. Clean or repair as necessary and retest system. If no blockage is found, check EVAP canister for water. See «DTC P0440 OR P1440: EVAP CONTROL SYSTEM»(ref-91142-S06746594222001030200000). Replace canister as necessary. If canister is okay, go to next step.
  7. Disconnect connector B-43 (Gray, 8-pin connector located near EVAP canister). Check continuity between ground and connector B-43 terminal No. 5. (Scheme 21) If continuity exists, go to next step. If continuity does not exist, repair open ground circuit.
  8. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
PressureVolts
Atmospheric Pressure3.0-3.6
2.76 in. Hg.4-.6

EVAP CONTROL SYSTEM PRESSURE SENSOR VOLTAGE

Scheme 20

Scheme 20
Scheme 20

Scheme 21

Scheme 21
Scheme 21
  1. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Remove instrument cluster and disconnect harness connectors. Check continuity of White/Blue wire between PCM harness connector terminal No. 29 and instrument cluster Brown 16-pin harness connector terminal No. 36. see scheme 2and (Scheme 22). If continuity exists, go to next step. If continuity does not exist, repair open in White/Blue wire.
  2. Reconnect all harness connectors. Check speedometer operation. If speedometer operates, go to next step. If speedometer does not operate, repair speedometer or circuit. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
  3. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 22

Scheme 22
Scheme 22
  1. Turn ignition off. Disconnect IAC valve harness connector. (Scheme 23) Turn ignition on. Measure voltage between ground and IAC valve harness connector Black/White wire. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Orange wire between IAC valve harness connector and PCM harness connector terminal No. 101. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Orange wire.
  3. Measure resistance between IAC valve terminals. Resistance should be about 10 ohms at 68°F (20°C). Check IAC valve plunger for sticking. Also check for broken IAC valve spring. Replace IAC valve, if necessary. If IAC valve is okay, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 23

Scheme 23
Scheme 23
  1. Turn ignition off. Disconnect closed Throttle Position (TP) switch harness connector. (Scheme 24) Turn ignition on. Measure voltage between ground and closed TP switch harness connector terminal No. 5 (Black/White wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Orange/White wire between PCM harness connector terminal No. 28 and closed TP switch harness connector. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Orange/White wire.
  3. Reconnect all harness connectors. Adjust closed TP switch. See THROTTLE POSITION (TP) SENSOR in ON-VEHICLE ADJUSTMENTS article. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect closed TP switch harness connector. Check continuity between closed TP switch terminals No. 4 and 5. (Scheme 24) Continuity should exist when accelerator pedal is released. Continuity should not exist when accelerator pedal is depressed. Replace closed TP switch if it does not operate as specified. If closed TP switch is okay, go to next step.
  4. Check TP sensor. See «DTC P0120: THROTTLE POSITION (TP) SENSOR»(ref-91142-S27645475842001030200000). Replace, if necessary. If TP sensor is okay, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 24

Scheme 24
Scheme 24
  1. Turn ignition off. Disconnect PCM and TCM harness connectors. see scheme 1 TCM is located under left side of instrument panel. Check continuity of the following: Purple/White wire between TCM harness connector terminal No. 37 and PCM harness connector terminal No. 26. Pink/Black wire between TCM harness connector terminal No. 38 and PCM harness connector terminal No. 27. Pink wire between TCM harness connector terminal No. 39 and PCM harness connector terminal No. 35. see scheme 2and (Scheme 25). If continuity exists, go to next step. If continuity does not exist, repair open circuit.
  2. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 25

Scheme 25
Scheme 25

Turn ignition on. Clear PCM memory. Perform DTC CONFIRMATION TEST . If DTC P0605 is still present in PCM memory, replace PCM. If DTC P0605 is not present in PCM memory, fault is intermittent and cannot be isolated at this time.

  1. Turn ignition off. Disconnect MAP/BARO solenoid harness connector. (Scheme 26) Turn ignition on. Measure voltage between ground and MAP/BARO solenoid harness connector Black/White wire. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Green/Orange wire between MAP/BARO solenoid harness connector and PCM harness connector terminal No. 118. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Green/Orange wire.
  3. Remove MAP/BARO solenoid. Using jumper wires, apply battery voltage to MAP/BARO solenoid terminals. (Scheme 27) Air should flow between ports "A" and "B". Air should not flow between ports "A" and "C". Remove jumper wires. Air should flow between ports "A" and "C". Air should not flow between ports "A" and "B". MAP/BARO solenoid should switch in less than one second. Replace MAP/BARO solenoid if operation is not as specified. If MAP/BARO solenoid is okay, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 26

Scheme 26
Scheme 26

Scheme 27

Scheme 27
Scheme 27
  1. Start engine and warm to normal operating temperature. Turn ignition off. Connect a vacuum gauge using a vacuum "T" to hose between MAP/BARO solenoid and Absolute Pressure (AP) sensor. (Scheme 26) Start engine and let it idle. Observe vacuum gauge. Vacuum should not exist for 5 seconds after starting engine. Vacuum should exist after engine has run for 5 seconds. If vacuum is as specified, go to step 3. If vacuum is not as specified, go to next step.
  2. Check vacuum hose for leaks or blockage. Also check intake manifold vacuum port for blockage. Check intake system for air leaks. Repair as necessary. If no problems are found, go to «PROCEDURE "A"»(ref-91142-S27555654032001030200000).
  3. Check hose between AP sensor and MAP/BARO solenoid for blockage, leaks or misconnection. Repair as necessary. Disconnect AP sensor harness connector. Inspect harness connector for water. If water exists, repair or replace connector. If water does not exist, check AP sensor. See «DTC P0105: ABSOLUTE PRESSURE (AP) SENSOR»(ref-91142-S26611741842001030200000). Replace, if necessary. If AP sensor is okay, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

See DTC P0133: RIGHT BANK, OR DTC P0153: LEFT BANK FRONT HEATED OXYGEN SENSOR .

  1. Attempt to start engine. If engine starts, go to step 6. If engine does not start, turn ignition off. Disconnect distributor 2-pin harness connector (for ignition coil). Turn ignition on. Measure voltage between ground and distributor 2-pin harness connector Black/White wire. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect distributor 6-pin harness connector (for power transistor and camshaft position sensor). Check continuity between ground and distributor 6-pin harness connector terminal No. 2 (Black wire). (Scheme 15) If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  3. Disconnect PCM harness connector. see scheme 1 Check continuity of White/Black wire between distributor 6-pin harness connector terminal No. 1 and PCM harness connector terminal No. 1. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in White/Black wire.
  4. Measure resistance between distributor 2-pin connector terminals. Resistance should be 0.5-1.0 ohm at 77°F (25°C). Also measure resistance between distributor 2-pin connector terminal No. 7 and coil tower. (Scheme 28) Resistance should be about 12,000 ohms at 77°F (25°C). If resistance is as specified, go to next step. If resistance is not as specified, replace distributor assembly.
  5. Measure resistance between distributor 6-pin connector terminal No. 2 and distributor 2-pin connector terminal No. 8 (power transistor). (Scheme 28) If resistance is zero ohms, replace distributor assembly. If resistance is not zero ohms, go to next step.
  6. Turn ignition off. Disconnect distributor 2-pin harness connector. Remove tape from resistor and disconnect harness connector. (Scheme 29) Disconnect PCM harness connector. see scheme 1 Check continuity of Blue wire between resistor harness connector and distributor 2-pin harness connector terminal No. 8. Also check continuity of White/Green wire between resistor harness connector and PCM harness connector terminal No. 2. If continuity exists, go to next step. If continuity does not exist, repair open circuit.
  7. Measure resistance of resistor. Resistance should be about 2200 ohms at 77°F (25°C). If resistance is not as specified, replace resistor. If resistance is as specified, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 28

Scheme 28
Scheme 28

Scheme 29

Scheme 29
Scheme 29
  1. Turn ignition off. Disconnect EGRC solenoid harness connector. (Scheme 30) Turn ignition on. Measure voltage between ground and EGRC solenoid harness connector Black/White wire. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Disconnect PCM harness connector. see scheme 1 Check continuity of Blue/White wire between EGRC solenoid harness connector and PCM harness connector terminal No. 103. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Blue/White wire.
  3. Remove EGRC solenoid. Using jumper wires, apply battery voltage to EGRC solenoid terminals. (Scheme 27) Air should flow between ports "A" and "B". Air should not flow between ports "A" and "C". Remove jumper wires. Air should not flow between ports "A" and "B". Air should flow between ports "A" and "C". EGRC solenoid should switch in one second or less. Replace EGRC solenoid if it does not operate as specified. If EGRC solenoid is okay, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 30

Scheme 30
Scheme 30
  1. Turn ignition off. Disconnect EGR temperature sensor harness connector. (Scheme 31) Turn ignition on. Measure voltage between EGR temperature sensor harness connector Pink/Green wire and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Pink/Green wire.
  2. Turn ignition off. Check continuity between EGR temperature sensor harness connector Black wire and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  3. Remove EGR temperature sensor. Measure resistance between EGR temperature sensor terminals with EGR temperature sensor at specified temperatures. See «EGR TEMPERATURE SENSOR RESISTANCE»(ref-91142-S00806805082001030200000) table. If resistance is not as specified, replace EGR temperature sensor. If resistance is as specified, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Temperature °F (°C)K/Ohms
32 (0)7900-9700
122 (50)570-700
212 (100)80-100

EGR TEMPERATURE SENSOR RESISTANCE

Scheme 31

Scheme 31
Scheme 31
  1. Inspect vacuum hoses for leaks, blockage or misconnection. See VACUUM DIAGRAMS article. Repair as necessary. If vacuum hoses are okay, turn ignition off. Disconnect PCM harness connector. see scheme 1 Turn ignition on. Connect a jumper wire between PCM harness connector terminal No. 103 and ground. see scheme 2 Listen for EGRC solenoid operating sound while connecting and disconnecting jumper wire. If operating sound is heard, go to next step. If operating sound is not heard, repair circuit or replace EGRC solenoid.
  2. Check EGRC solenoid. See «DTC P1400: EGRC SOLENOID»(ref-91142-S31925370602001030200000). Replace, if necessary. If EGRC solenoid is okay, check EGR valve. See «DTC P0400: EGR FUNCTION»(ref-91142-S16112440892001030200000). Replace, if necessary. If EGR valve is okay, check EGR-BPT. See «DTC P0402: EGR CONTROL BACKPRESSURE TRANSDUCER (EGRC-BPT)»(ref-91142-S35323968392001030200000). Replace, if necessary. If EGR-BPT is okay, go to next step.
  3. Check EGR temperature sensor. See «DTC P1401: EGR TEMPERATURE SENSOR»(ref-91142-S15856556832001030200000). Replace, if necessary. If EGR temperature sensor is okay, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Check EVAP-CPVCV and circuit. See «DTC P0443: EVAP CANISTER PURGE VOLUME CONTROL VALVE (EVAP-CPVCV)»(ref-91142-S36984932882001030200000) . Repair as necessary. If EVAP-CPVCV and circuit are okay, check EVAP-CSPS. See «DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR (EVAP-CSPS)»(ref-91142-S11019582672001030200000) . Replace, if necessary. If EVAP-CSPS is okay, check EVAP-CVCV. See «DTC P0446: EVAP CANISTER VENT CONTROL VALVE (EVAP-CVCV)»(ref-91142-S36435603342001030200000) . Replace, if necessary. If EVAP-CVCV is okay, go to next step.
  2. Check for blockage in water separator or hose to EVAP-CVCV. Clean or replace as necessary. If water separator and hose are okay, remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water drains from EVAP canister, go to next step. If water does not drain from EVAP canister, go to step 4 .
  3. Weigh EVAP canister with EVAP-CVCV attached. If EVAP canister weighs less than 4.0 lbs. (1.8 kg), go to next step. If EVAP canister weighs more than 4.0 lbs. (1.8 kg), inspect EVAP canister for damage and check hose between water separator and EVAP canister for blockage or leak. Repair hose or replace EVAP canister, if necessary. If EVAP canister and hose are okay, check water separator for blockage or damage. Replace as necessary and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Check for blockage in water separator or hose to EVAP-CVCV. See VACUUM DIAGRAMS article. Clean or replace as necessary. If water separator and hose are okay, check EVAP-CVCV. See «DTC P0446: EVAP CANISTER VENT CONTROL VALVE (EVAP-CVCV)»(ref-91142-S36435603342001030200000) . Replace, if necessary. If EVAP-CVCV is okay, go to next step.
  2. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step 4 . If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If EVAP canister weighs less than 4.0 lbs. (1.8 kg), go to step 4 . If EVAP canister weighs more than 4.0 lbs. (1.8 kg), go to next step.
  3. Inspect EVAP canister for damage and check hose between water separator and EVAP canister for blockage or leak. Repair hose or replace EVAP canister, if necessary. If EVAP canister and hose are okay, check water separator for blockage or damage. Replace as necessary and retest system.
  4. Check EVAP-CSPS. See «DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR (EVAP-CSPS)»(ref-91142-S11019582672001030200000) . Replace, if necessary. If EVAP-CSPS is okay, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Check EVAP canister for cracks and replace as necessary. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose (on EVAP service port side) from EVAP Canister Purge Volume Control Valve (EVAP-CPVCV). Install vacuum gauge to port on EVAP-CPVCV. Go to next step.
  2. Start engine and let idle for at least 80 seconds. Increase engine speed to 2000 RPM and observe vacuum gauge. Vacuum should exist. Release throttle. Vacuum should not exist. If vacuum is as specified, go to step 4 . If vacuum is not as specified, go to next step.
  3. Turn ignition off. Disconnect purge hoses from EVAP-CPVCV. Ensure air flows through hoses and purge port freely. If hoses and port are okay, repair EVAP-CPVCV or circuit. See «DTC P0443: EVAP CANISTER PURGE VOLUME CONTROL VALVE (EVAP-CPVCV)»(ref-91142-S36984932882001030200000) .
  4. Check EVAP-CSPS. See «DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR (EVAP-CSPS)»(ref-91142-S11019582672001030200000) . Replace, if necessary. If EVAP-CSPS is okay, check EVAP-CVCV. See «DTC P0446: EVAP CANISTER VENT CONTROL VALVE (EVAP-CVCV)»(ref-91142-S36435603342001030200000) . Replace, if necessary. If EVAP-CVCV is okay, go to next step.
  5. Check EVAP purge line for leaks. Replace, if necessary. If EVAP purge line is okay, clean purge line with compressed air. Test is complete. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Check for blockage in water separator and EVAP-CVCV hose. Clean or replace, if necessary. If no problems are found, check EVAP-CVCV. See «DTC P0446: EVAP CANISTER VENT CONTROL VALVE (EVAP-CVCV)»(ref-91142-S36435603342001030200000) . Replace, if necessary. If EVAP-CVCV is okay, check vacuum cut valve. See «DTC P1491: EVAP VACUUM CUT VALVE BY-PASS VALVE»(ref-91142-S00018652622001030200000) . Replace, if necessary. If vacuum cut valve is okay, go to next step.
  2. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step 4 . If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If EVAP canister weighs less than 4.0 lbs. (1.8 kg), go to step 4 . If EVAP canister weighs more than 4.0 lbs. (1.8 kg), go to next step.
  3. Inspect EVAP canister for damage and check hose between water separator and EVAP canister for blockage or leak. Repair hose or replace EVAP canister, if necessary. If EVAP canister and hose are okay, check water separator for blockage or damage. Replace as necessary and retest system.
  4. Check EVAP-CSPS. See «DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR (EVAP-CSPS)»(ref-91142-S11019582672001030200000) . Replace, if necessary. If EVAP-CSPS is okay, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect vacuum cut valve by-pass valve harness connector. (Scheme 32) Turn ignition on. Measure voltage between vacuum cut valve by-pass valve harness connector Black/White wire and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect PCM harness connector. see scheme 1 Check continuity of Green/White wire between EVAP vacuum cut valve by-pass valve harness connector and PCM harness connector terminal No. 120. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Green/White wire.
  3. Using jumper wires, apply battery voltage to vacuum cut valve by-pass valve terminals. (Scheme 33) Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow between ports "A" and "B". Vacuum cut valve by-pass valve should switch in one second or less. Replace vacuum cut valve by-pass valve, if operation is not as specified. If operation is as specified, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 32

Scheme 32
Scheme 32

Scheme 33

Scheme 33
Scheme 33
  1. Remove EVAP vacuum cut valve with EVAP vacuum cut valve by-pass valve connected. Apply vacuum to port "A". Vacuum should not exist at port "B". Apply vacuum to port "B". Vacuum should exist at port "A". Blow air in port "B". Air should flow out of port "A" with some resistance. Using jumper wires, apply battery voltage to vacuum cut valve by-pass valve terminals. (Scheme 34) Air should flow freely through ports "A" and "B" in both directions. If operation is as specified, go to next step. If operation is not as specified, go to step 3.
  2. Check the following: EVAP purge line between canister and fuel tank for blockage or disconnection. EVAP canister. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. Purge port of fuel tank for blockage. Repair or replace as necessary and go to next step. If no problems are found, go to step 5.
  3. Check for blockage in by-pass hoses. Repair as necessary. If by-pass hoses are okay, check vacuum cut valve by-pass valve. See «DTC P1490: EVAP VACUUM CUT VALVE BY-PASS VALVE»(ref-91142-S39167251962001030200000). Replace, if necessary. If vacuum cut valve by-pass valve is okay, remove hoses from vacuum cut valve. Plug ports "C" and "D". (Scheme 34) Go to next step.
  4. Apply vacuum to port "A". Vacuum should not exist at port "B". Apply vacuum to port "B". Vacuum should exist at port "A". Blow air in port "B". Air should flow out of port "A" with some resistance. Unplug ports "C" and "D". Blow air in port "A". Air should flow freely out of port "C". Blow into port "B". Air should flow freely out of port "D". Replace vacuum cut valve if operation is not as specified. If vacuum cut valve and vacuum cut valve by-pass valve test okay, go to next step.
  5. Check EVAP-CSPS. See «DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR (EVAP-CSPS)»(ref-91142-S11019582672001030200000). Repair or replace as necessary. If EVAP-CSPS is okay, check EVAP-CVCV. See «DTC P0446: EVAP CANISTER VENT CONTROL VALVE (EVAP-CVCV)»(ref-91142-S36435603342001030200000). Repair or replace as necessary. If EVAP-CVCV is okay, go to next step.
  6. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 34

Scheme 34
Scheme 34
  1. Turn ignition off. Disconnect PCM and TCM harness connectors. see scheme 1 TCM is located under left side of instrument panel. Check continuity of Yellow/Green wire between TCM harness connector terminal No. 4 and PCM harness connector terminal No. 7. see scheme 2and (Scheme 25). If continuity exists, go to next step. If continuity does not exist, repair open in Yellow/Green wire.
  2. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Procedure (A/T Models)

  1. Turn ignition off. Disconnect inhibitor switch 2-pin harness connector. (Scheme 35) Check continuity between ground and inhibitor switch 2-pin harness connector Black wire. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  2. Disconnect PCM harness connector. see scheme 1 Check continuity between inhibitor switch harness connector Black/Yellow wire and PCM harness connector terminal No. 22 (Blue/Black wire). see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open circuit.
  3. Disconnect inhibitor switch 7-pin harness connector. Check continuity between specified terminals with gearshift lever in appropriate position. See «INHIBITOR SWITCH CONTINUITY»(ref-91142-S38146109922001030200000) table. (Scheme 36) If continuity is as specified, go to step 5. If continuity is not as specified, go to next step.
  4. Disconnect gearshift linkage and recheck continuity. If continuity is as specified, adjust gearshift linkage. See AUTOMATIC TRANSMISSION article in TRANSMISSION SERVICING. If continuity is still not as specified, remove inhibitor switch and recheck continuity. If continuity is as specified, adjust inhibitor switch. If continuity is still not as specified, replace inhibitor switch.
  5. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Gearshift PositionContinuity Between Terminals No.
P1 & 2; 3 & 4
R3 & 5
N1 & 2; 3 & 6
D3 & 7
23 & 8
13 & 9

INHIBITOR SWITCH CONTINUITY

Scheme 35

Scheme 35
Scheme 35

Scheme 36

Scheme 36
Scheme 36

Procedure (M/T Models)

  1. Turn ignition off. Disconnect neutral position switch harness connector. (Scheme 37) Check continuity between ground and neutral position switch harness connector Black wire. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  2. Disconnect PCM harness connector. see scheme 1 Check continuity of Blue/Black wire between neutral position switch harness connector and PCM harness connector terminal No. 22. see scheme 2 If continuity exists, go to next step. If continuity does not exist, repair open in Blue/Black wire.
  3. Check continuity between neutral position switch terminals. With transmission in Neutral, continuity should exist. With transmission in any other gear, continuity should not exist. If continuity is as specified, go to next step. If continuity is not as specified, replace neutral position switch.
  4. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 37

Scheme 37
Scheme 37

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