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Engine Controls - Self-Diagnostics - 2.0: Other Infiniti G20 II

Testing & Diagnostics 28 illustrations ~15143 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. Repair as necessary and retest system. If no problems are found, go to next step.
  2. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 12) Disconnect MAF sensor harness connector, located near air cleaner housing. Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminal No. 2 (White wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  3. Measure voltage between ground and MAF sensor harness connector terminal No. 2 (Red wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short circuit between MAF sensor and ECM. Retest system.
  4. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of Green wire between MAF sensor harness connector terminal No. 3 and ECM harness connector terminal No. 73. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  5. Check continuity of Blue wire between MAF sensor harness connector terminal No. 1 and ECM harness connector terminal No. 61. Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  6. Reconnect all connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 61 by backprobing, with engine at specified speeds. See «MASS AIRFLOW SENSOR VOLTAGE»(ref-3086-S33552706812000041700000) table.
  7. If voltage is as specified, go to next step. If voltage is not as specified, check for dust or foreign material in hot wire air passage of mass airflow sensor. If air passage is okay, replace mass airflow sensor and retest system.
  8. Turn ignition off. Disconnect Blue, 12-pin Joint Connector (J/C) No. 1 (connector F-19). (Scheme 12) Check continuity between ground and connector F-19 terminal No. 1 (Black wire). See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Also check circuit for short to voltage. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  9. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
ConditionVolts
Key On, Engine OffLess Than 1.0
Engine Idling1.3-1.7
2500 RPM1.8-2.4
Idle To 4000 RPM(1) 1.3-1.7 To About 4.0
(1) Voltage should rise in proportion to engine speed.
(1)Voltage should rise in proportion to engine speed.

MASS AIRFLOW SENSOR VOLTAGE

Scheme 12

Scheme 12
Scheme 12
  1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 12) Disconnect AP sensor harness connector located on top of air cleaner housing. Inspect connector for water. If water exists, repair or replace connector and retest system. If water does not exist, go to next step.
  2. Turn ignition on. Measure voltage between engine ground and AP sensor harness connector terminal No. 1 (Pink/Blue wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between AP sensor and ECM. Retest system.
  3. Turn ignition off. Check continuity between engine ground and AP sensor harness connector terminal No. 3 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  4. Disconnect ECM harness connector. see scheme 1 Check continuity of White wire between ECM harness connector terminal No.80 and AP sensor harness connector terminal No. 2. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  5. Reconnect all harness connectors. Remove AP sensor from its bracket and disconnect vacuum hose. Turn ignition on. Measure voltage between engine ground and ECM terminal No. 80 by backprobing. Voltage should be 3.2-4.8 volts. Using a hand vacuum pump, apply 7.88 in. Hg (26.7 kPa) 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 13) If voltage is as specified, go to next step. If voltage is not as specified, replace AP sensor and retest system.
  6. Turn ignition off. Disconnect Blue, 12-pin Joint Connector (J/C) No. 1 (connector F-19). (Scheme 12) Check continuity between ground and connector F-19 terminal No. 2 (Black wire). See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Also check circuit for short to voltage. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  7. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 13

Scheme 13
Scheme 13
  1. Turn ignition off. Disconnect IAT sensor harness connector located on air intake duct, near battery. Turn ignition on. Measure voltage between ground and IAT sensor harness connector terminal No. 1 (Red/Yellow wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between ECM and IAT sensor. Retest system.
  2. Turn ignition off. Check continuity between engine ground and IAT sensor harness connector terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  3. Remove IAT sensor. Measure resistance between IAT sensor terminals, with sensor at specified temperatures. See «IAT SENSOR RESISTANCE»(ref-3086-S13279707162000050100000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace IAT sensor and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Temperature °F (°C)(1) Ohms
68 (20)2100-2900
176 (80)270-380
(1) Resistance should decrease as temperature increases. (Scheme 14)
(1)Resistance should decrease as temperature increases. (Scheme 14)

IAT SENSOR RESISTANCE

Scheme 14

Scheme 14
Scheme 14
  1. Turn ignition off. Disconnect ECT sensor harness connector. (Scheme 15) Turn ignition on. Measure voltage between ground and ECT sensor harness connector terminal No. 1 (Brown/Yellow wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between ECM and ECT sensor. Retest system.
  2. Turn ignition off. Check continuity between engine ground and ECT sensor harness connector terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  3. Remove ECT sensor. Measure resistance between ECT sensor terminals, with sensor at specified temperatures. See «ECT SENSOR RESISTANCE»(ref-3086-S33527110422000050200000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace ECT sensor and retest system.
  4. If DTC P0115 is present, go to next step. If DTC P0125 is present, reconnect all harness connectors. Allow engine to cool until coolant temperature is less than 180°F (82°C). Start engine. Grasp lower radiator hose. If coolant is flowing through lower radiator hose, replace 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»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Temperature °F (°C)(1) Ohms
68 (20)2100-2900
122 (50)680-1000
194 (90)236-260
(1) Resistance should decrease as temperature increases. (Scheme 14)
(1)Resistance should decrease as temperature increases. (Scheme 14)

ECT SENSOR RESISTANCE

Scheme 15

Scheme 15
Scheme 15
  1. If malfunction "A" or "B" was duplicated, go to next step. If malfunction "C" was duplicated, adjust TP sensor. See «ON-VEHICLE ADJUSTMENTS»(ref-4039) article. Check air intake duct and vacuum hoses for leaks or disconnection. Reconnect or repair as necessary and retest system. If no problems are found, go to next step.
  2. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 12) Disconnect TP sensor harness connector. (Scheme 16) Turn ignition on. Measure voltage between ground and TP sensor harness connector terminal No. 3 (Pink/Blue wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between ECM and TP sensor. Retest system.
  3. Turn ignition off. Check continuity between engine ground and TP sensor harness connector terminal No. 1 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  4. Disconnect ECM harness connector. see scheme 1 Check continuity of Yellow wire between ECM harness connector terminal No. 92 and TP sensor harness connector terminal No. 2. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  5. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose from throttle opener. (Scheme 17) Using a hand vacuum pump, apply vacuum to throttle opener until throttle opener rod does not contact throttle drum. Turn ignition on. Measure voltage between ground and ECM terminal No. 92 by backprobing, with throttle in specified positions. See «THROTTLE POSITION (TP) SENSOR VOLTAGE»(ref-3086-S09751360112000041700000) table. If voltage is as specified, go to next step. If voltage is not as specified, adjust TP sensor, if possible. See «ON-VEHICLE ADJUSTMENTS»(ref-4039) article. If TP sensor can not be adjusted, replace TP sensor and retest system.
  6. If malfunction "B" was duplicated, go to step 9. If malfunction "A" or "C" was duplicated, ensure engine is at normal operating temperature. Measure voltage between ground and ECM terminal No. 61 by backprobing, with engine at specified speeds. See «MASS AIRFLOW SENSOR VOLTAGE»(ref-3086-S11151863392000050200000) table. If voltage is as specified, go to next step. If voltage is not as specified, check for dust or foreign material in hot wire air passage of mass airflow sensor. If air passage is okay, replace mass airflow sensor and retest system.
  7. Start engine and warm to normal operating temperature. Measure voltage between engine ground and ECM terminals No. 66, 75 and 85 by backprobing, with engine at specified speeds. See «PIN VOLTAGE CHARTS»(ref-3090) article. If voltage and waveforms are as specified, go to next step. If voltage and waveforms are not as specified, replace CMP sensor and retest system.
  8. Turn ignition off. Disconnect fuel injector harness connectors. Measure resistance between each injector terminals. Resistance should be 14-15 ohms at 68°F (20°C). If resistance is as specified on all injectors, go to next step. If resistance is not as specified, replace defective injector and retest system.
  9. Disconnect Blue, 12-pin Joint Connector (J/C) No. 1 (connector F-19). (Scheme 12) Check continuity between ground and connector F-19 terminal No. 1 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  10. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Throttle PositionVolts
Fully Closed.2-.8
Partially Opened.2-.8 To 3.5-4.5
Fully Open3.5-4.5

THROTTLE POSITION (TP) SENSOR VOLTAGE

ConditionVolts
Key On, Engine OffLess Than 1.0
Engine Idling1.3-1.7
2500 RPM1.8-2.4
Idle To 4000 RPM(1) 1.3-1.7 To About 4.0
(1) Voltage should rise in proportion to engine speed.
(1)Voltage should rise in proportion to engine speed.

MASS AIRFLOW SENSOR VOLTAGE

Scheme 16

Scheme 16
Scheme 16

Scheme 17

Scheme 17
Scheme 17
  1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 12) Disconnect front HO2S harness connector and ECM harness connector. Check continuity of White wire between front HO2S harness connector terminal No. 2 and ECM harness connector terminal No. 62. see scheme 1and see scheme 2. Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  2. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 62 by backprobing. Increase engine speed to 2000 RPM. The following conditions should exist: Voltage cycles from 0-0.3 volt to 0.6-1.0 volt more than 5 times within 10 seconds. 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 1.0 volt. If operation is as specified, go to next step. If operation is not as specified, replace front HO2S and retest system.
  3. Turn ignition off. Disconnect Blue, 12-pin Joint Connector (J/C) No. 1 (connector F-19). (Scheme 12) Check continuity between ground and connector F-19 terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Loosen and retighten front HO2S to 30-44 ft. lbs. (40-60 N.m). Start engine and warm to normal operating temperature. Turn ignition off. Disconnect Mass Airflow (MAF) sensor harness connector, located near air cleaner housing. Start engine and let it idle for at least 3 seconds. Turn ignition off and reconnect MAF sensor harness connector.
  2. Ensure DTC P0100 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. Recheck for DTCs. If DTC P0171 or P0172 is present and engine is hard to start, perform diagnosis for DTC P0171 or P0172. See «DTC P0171 OR P0172: FUEL INJECTION SYSTEM FUNCTION»(ref-3086-S05775864892000041700000). If DTC P0171 or P0172 is not present and engine is not hard to start, go to next step.
  3. Turn ignition off. Disconnect front HO2S harness connector. Inspect connector for water or damage. Repair as necessary. 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 and retest system.
  4. Reconnect front HO2S harness connector. Start engine and warm to normal operating temperature. Measure voltage between engine ground and ECM terminal No. 62 by backprobing. see scheme 2 Increase engine speed to 2000 RPM. The following conditions should exist: Voltage cycles from 0-0.3 volt to 0.6-1.0 volt more than 5 times within 10 seconds. 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 1.0 volt. If operation is as specified, go to next step. If operation is not as specified, replace front HO2S and retest system.
  5. Turn ignition off. Disconnect Blue, 12-pin Joint Connector (J/C) No. 1 (connector F-19). (Scheme 12) Check continuity between ground and connector F-19 terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  6. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 12) Loosen and retighten front HO2S to 30-44 ft. lbs. (40-60 N.m). Start engine and check for exhaust leak before catalyst. Also check for air intake leak after Mass Airflow (MAF) sensor. Repair as necessary and retest system. If no problems are found, go to next step.
  2. Warm engine to normal operating temperature. Turn ignition off. Disconnect MAF sensor harness connector, located near air cleaner housing. Start engine and let it idle for at least 3 seconds. Turn ignition off and reconnect MAF sensor harness connector.
  3. Ensure DTC P0100 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. Recheck for DTCs. If DTC P0171 or P0172 is present and engine is hard to start, perform diagnosis for DTC P0171 or P0172. See «DTC P0171 OR P0172: FUEL INJECTION SYSTEM FUNCTION»(ref-3086-S05775864892000041700000). If DTC P0171 or P0172 is not present and engine is not hard to start, go to next step.
  4. Disconnect front HO2S and ECM harness connectors. see scheme 1 Check continuity of White wire between front HO2S harness connector terminal No. 2 and ECM harness connector terminal No. 62. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  5. 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 and retest system.
  6. Reconnect front HO2S harness connector. Start engine and warm to normal operating temperature. Measure voltage between engine ground and ECM terminal No. 62 by backprobing. see scheme 2 Increase engine speed to 2000 RPM. The following conditions should exist: Voltage cycles from 0-0.3 volt to 0.6-1.0 volt more than 5 times within 10 seconds. 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 1.0 volt. If operation is as specified, go to next step. If operation is not as specified, replace front HO2S and retest system.
  7. Ensure engine is at normal operating temperature. Measure voltage between ground and ECM terminal No. 61 by backprobing, with engine at specified speeds. See «MASS AIRFLOW SENSOR VOLTAGE»(ref-3086-S11151863392000050200000) table. If voltage is as specified, go to next step. If voltage is not as specified, check for dust or foreign material in hot wire air passage of mass airflow sensor. If air passage is okay, replace mass airflow sensor and retest system.
  8. With engine idling, remove PCV valve, leaving vacuum hose connected. A hissing noise should be heard as air passes through valve. A strong vacuum should be felt immediately when a finger is placed over valve inlet. If operation is as specified, go to next step. If operation is not as specified, replace PCV valve and retest system.
  9. Turn ignition off. Disconnect Blue, 12-pin Joint Connector (J/C) No. 1 (connector F-19). (Scheme 12) Check continuity between ground and connector F-19 terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  10. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
ConditionVolts
Key On, Engine OffLess Than 1.0
Engine Idling1.3-1.7
2500 RPM1.8-2.4
Idle To 4000 RPM(1) 1.3-1.7 To About 4.0
(1) Voltage should rise in proportion to engine speed.
(1)Voltage should rise in proportion to engine speed.

MASS AIRFLOW SENSOR VOLTAGE

  1. Turn ignition off. Loosen and retighten front HO2S to 30-44 ft. lbs. (40-60 N.m). Disconnect front HO2S and ECM harness connectors. see scheme 1 Check continuity of White wire between front HO2S harness connector terminal No. 2 and ECM harness connector terminal No. 62. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  2. Inspect HO2S harness connector for water. If water exists, repair or replace connector and retest system. If water does not exist, reconnect front HO2S harness connector. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 62 by backprobing. Increase engine speed to 2000 RPM. The following conditions should exist: Voltage cycles from 0-0.3 volt to 0.6-1.0 volt more than 5 times within 10 seconds. 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 1.0 volt. If operation is as specified, go to next step. If operation is not as specified, replace front HO2S and retest system.
  3. Turn ignition off. Disconnect Blue, 12-pin Joint Connector (J/C) No. 1 (connector F-19). (Scheme 12) Check continuity between ground and connector F-19 terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect front HO2S harness connector. Turn ignition on. Measure voltage between ground and front HO2S harness connector terminal No. 1 (Brown/Yellow wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of Orange wire between ECM harness connector terminal No. 4 and front HO2S harness connector terminal No. 3. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. 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 front HO2S and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 12) If diagnosing for DTC P0140, go to step 3. If diagnosing for DTC P0137, P0138 or P0139, start engine and warm to normal operating temperature. Turn ignition off. Disconnect Mass Airflow (MAF) sensor harness connector located near air cleaner housing. Start engine and let it idle for at least 3 seconds. Turn ignition off and reconnect MAF sensor harness connector.
  2. Ensure DTC P0100 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. Recheck for DTCs. If DTC P0171 or P0172 is present and engine is hard to start, perform diagnosis for DTC P0171 or P0172. See «DTC P0171 OR P0172: FUEL INJECTION SYSTEM FUNCTION»(ref-3086-S05775864892000041700000). If DTC P0171 or P0172 is not present and engine is not hard to start, go to next step.
  3. Turn ignition off. Disconnect rear HO2S and ECM harness connectors. see scheme 1 Inspect connector for water. If water exists, repair or replace connector and retest system. If water does not exist, check continuity of White wire between ECM harness connector terminal No. 63 and HO2S harness connector terminal No. 1. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  4. Check continuity between engine ground and HO2S harness connector terminal No. 4. Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  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 engine ground and ECM terminal No. 63 by backprobing. While observing voltage, quickly increase engine speed to 4000 RPM at least 10 times. If voltage increases to more than.48 volt at least one time, go to step 7. If voltage does not increase to more than.48 volt, go to next step.
  6. Idle engine for 10 minutes and recheck voltage. If voltage does not decrease to less than.43 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.43 volt at least one time, replace HO2S and retest system. If voltage decreases to less than.43 volt at least once, go to next step.
  7. Turn ignition off. Disconnect Blue, 12-pin Joint Connector (J/C) No. 1 (connector F-19). (Scheme 12) Check continuity between ground and connector F-19 terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  8. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect rear HO2S harness connector. Turn ignition on. Measure voltage between ground and rear HO2S harness connector terminal No. 2 (Brown/Yellow wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM and rear HO2S harness connectors. see scheme 1 Check continuity of Red/Yellow wire between rear HO2S harness connector terminal No. 3 and ECM harness connector terminal No. 3. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. Measure resistance between HO2S terminals No. 2 (Brown/Yellow wire) and No. 3 (Red/Yellow 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 continuity or continuity is not as specified, replace HO2S and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Start engine and let it idle. Check for leaks in exhaust system before 3-way catalyst. Check for leaks in intake system after MAF sensor. Repair as necessary and retest system. If no leaks are detected, go to next step.
  2. Turn ignition off. Disconnect front HO2S harness connector and ECM harness connector. see scheme 1 Check continuity of White wire between ECM harness connector terminal No. 62 and front HO2S harness connector terminal No. 2. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. Check fuel pressure. See «BASIC DIAGNOSTIC PROCEDURES»(ref-3083) article. If fuel pressure is okay, go to next step. If fuel pressure is not okay, check fuel pump, fuel pressure regulator and fuel lines. See «FUEL SYSTEM»(ref-3089-S14351516162000041700000) in SYSTEM & COMPONENT TESTING article. Repair as necessary and retest system.
  4. Install all removed parts. Start engine and warm to normal operating temperature. Select MODE 1 with scan tool, and read Mass Airflow (MAF) signal. MAF reading should be 2.5-5.0 g/sec at idle and 7.1-12.5 g/sec at 2500 RPM. If MAF reading is as specified, go to next step. If MAF reading is not as specified, repair MAF sensor or circuit. See «DTC P0100: MASS AIRFLOW (MAF) SENSOR»(ref-3086-S42305467572000041700000).
  5. With engine operating at idle speed, listen to each injector for clicking noise. If any injector does not click, repair circuit or replace injector. See «FUEL SYSTEM»(ref-3089-S14351516162000041700000) in SYSTEM & COMPONENT TESTING article. If all injectors click, go to next step.
  6. 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.
  7. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Disconnect fuel level sensor/FTT sensor harness connector located under rear seat. Turn ignition on. Measure voltage between ground and FTT sensor harness connector terminal No. 2 (Light Green/Red wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between ECM and FTT sensor. Retest system.
  2. Turn ignition off. Check continuity between body ground and FTT harness connector terminal No. 1 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  3. Remove FTT sensor. Measure resistance between sensor terminals No. 1 and 2, with sensor at specified temperatures. See «FTT SENSOR RESISTANCE»(ref-3086-S04320098422000050300000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Temperature °F (°C)(1) Ohms
68 (20)2300-2700
122 (50)790-970
(1) Resistance should decrease as temperature increases. (Scheme 14)
(1)Resistance should decrease as temperature increases. (Scheme 14)

FTT SENSOR RESISTANCE

  1. Turn ignition off. Disconnect cooling fan relays No. 2 and 3. (Scheme 18) Start engine and let it idle. Turn A/C switch and blower fan switch to ON position. If cooling fans operate at low speed, go to next step. If cooling fans do not operate at low speed, go to step 5.
  2. Turn ignition off. Reconnect cooling fan relays No. 2 and 3. Disconnect cooling fan relay No. 1. Turn A/C and blower off. Disconnect ECT sensor harness connector. (Scheme 15) Connect a 150-ohm resistor between ECT sensor harness connector terminals. Start engine. If cooling fans operate at high speed, go to next step. If cooling fans do not operate at high speed, go to step 8.
  3. Pressure test cooling system and radiator cap. Check thermostat operation. Radiator cap relief pressure should be 8.6-14.2 psi (59-98 kPa). Thermostat opening temperature should be 180°F (82°C). Repair as necessary and retest system. If no problems are found, go to next step.
  4. Remove ECT sensor. Measure resistance between sensor terminals, with sensor at specified temperatures. See «ECT SENSOR RESISTANCE»(ref-3086-S10616422342000050300000) table. If resistance is not as specified, replace ECT sensor and retest system. If resistance is as specified, check for other possible causes of engine overheating and repair as necessary.
  5. Turn ignition off. Reconnect all harness connectors. Disconnect cooling fan relay No. 1. Turn ignition on. Measure voltage between ground and cooling fan relay No. 1 harness connector terminals No. 1 (Brown wire), No. 3 (Green wire) and No. 7 (Green/White wire). (Scheme 19) If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  6. Turn ignition off. Disconnect both cooling fan motor harness connectors located on fan shrouds. Check continuity of the following: Green/Red wire between cooling fan relay No. 1 harness connector terminal No. 6 and left cooling fan motor harness connector terminal No. 1. Black wire between left cooling fan motor harness connector terminal No. 4 and body ground. Green/Black wire between cooling fan relay No. 1 harness connector terminal No. 5 and right cooling fan motor harness connector terminal No. 1. Black wire between right cooling fan motor harness connector terminal No. 4 and body ground. Also check circuits for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
  7. Disconnect ECM harness connector. see scheme 1 Check continuity of Blue/Yellow wire between cooling fan relay No. 1 harness connector terminal No. 2 and ECM harness connector terminal No. 13. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to step 11.
  8. Turn ignition off. Disconnect cooling fan relays No. 2 and 3. Turn ignition on. Measure voltage between ground and cooling fan relays No. 2 and 3 harness connectors terminals No. 1 (Brown wires) and No. 3 (Green/White wire on cooling fan relay No. 2; Green wire on cooling fan relay No. 3). (Scheme 19) If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  9. Turn ignition off. Disconnect both cooling fan motor harness connectors located on fan shrouds. Check continuity of the following: Green/Yellow wire between cooling fan relay No. 2 harness connector terminal No. 5 and left cooling fan motor harness connector terminal No. 2. Light Green/Black wire between Cooling fan relay No. 2 terminal No. 6 and left cooling fan motor harness connector terminal No. 3. Black wire between cooling fan relay No. 2 harness connector terminal No. 7 and body ground. Green/Yellow wire between cooling fan relay No. 3 harness connector terminal No. 5 and right cooling fan motor harness connector terminal No. 2. Light Green/Black wire between cooling fan relay No. 3 harness connector terminal No. 6 and right cooling fan motor harness connector terminal No. 3. Black wire between cooling fan relay No. 3 harness connector terminal No. 7 and body ground. Also check circuits for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
  10. Disconnect ECM harness connector. see scheme 1 Check continuity of Light Green wires between cooling fan relay No. 2 harness connector terminal No. 2, cooling fan relay No. 3 harness connector terminal No. 2 and ECM harness connector terminal No. 12. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  11. Using jumper wires, apply battery voltage to removed cooling fan relay terminals No. 1 and 2. See Check continuity between terminals No. 3 and 5. Also check continuity between terminals No. 6 and 7. Continuity should exist. Remove jumper wires. Continuity should not exist. If continuity is as specified, go to next step. If continuity is not as specified, replace cooling fan relay and retest system.
  12. Using jumper wires, connect battery positive to each cooling fan motor terminal No. 1 and ground to terminal No. 4. (Scheme 20) Fan should operate at low speed. Using additional jumper wires, apply battery positive to terminal No. 2 and ground to terminal No. 3. Fan should operate at high speed. If fan operates as specified, go to next step. If fan does not operate as specified, replace fan motor and retest system.
  13. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Temperature °F (°C)(1) Ohms
68 (20)2100-2900
122 (50)680-1000
194 (90)236-260
(1) Resistance should decrease as temperature increases. (Scheme 14)
(1)Resistance should decrease as temperature increases. (Scheme 14)

ECT SENSOR RESISTANCE

Scheme 18

Scheme 18
Scheme 18

Scheme 19

Scheme 19
Scheme 19

Scheme 20

Scheme 20
Scheme 20
  1. Start engine and let it idle. Check for intake leaks. Stop engine and visually inspect exhaust system, 3-way catalyst and muffler for damage. Repair as necessary and retest system. If no problems are detected, go to next step.
  2. Check if EGR valve is stuck open. Perform «DTC CONFIRMATION TEST»(ref-3086-S35690139292000051000000) under DTC P1402: EGR FUNCTION. Repair EGR system as necessary and retest system. If EGR system is okay, go to next step.
  3. Start engine and let it idle. Individually, disconnect fuel injector harness connectors. If engine speed momentarily drops on every cylinder, go to step 5. If engine speed does not momentarily drop, listen to injector at misfiring cylinder. If injector clicks, go to next step. If injector does not click, repair injector or circuit as necessary and retest system. See «FUEL SYSTEM»(ref-3089-S14351516162000041700000) in SYSTEM & COMPONENT TESTING article.
  4. 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 spark is detected, go to next step. If no spark is detected, check ignition wires, ignition coil, power transistor and related circuits. See «DTC P1320: IGNITION SIGNAL»(ref-3086-S27415444062000041700000). Repair as necessary and retest system.
  5. Remove spark plugs. Inspect spark plugs for proper gap, fouling or damage. Repair as necessary and retest system. If spark plugs are okay, Check cylinder compression. See «BASIC DIAGNOSTIC PROCEDURES»(ref-3083) article. Repair engine as necessary and retest system. If compression is okay, go to next step.
  6. Check fuel pressure. See «BASIC DIAGNOSTIC PROCEDURES»(ref-3083) article. If fuel pressure is okay, go to next step. If fuel pressure is not okay, repair fuel system as necessary and retest system. See «FUEL SYSTEM»(ref-3089-S14351516162000041700000) in SYSTEM & COMPONENT TESTING article.
  7. Check ignition timing. See «ON-VEHICLE ADJUSTMENTS»(ref-4039) article. Adjust, if necessary and retest system. If ignition timing is okay, go to next step.
  8. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 62 (front HO2S signal) by backprobing. see scheme 1and see scheme 2. Increase engine speed to 2000 RPM. The following conditions should exist: Voltage cycles from 0-0.3 volt to 0.6-1.0 volt more than 5 times within 10 seconds. 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 1.0 volt. If operation is as specified, go to next step. If operation is not as specified, replace front HO2S and retest system.
  9. Start engine and warm to normal operating temperature. Select MODE 1 with scan tool, and read Mass Airflow (MAF) signal. MAF reading should be 2.5-5.0 g/sec at idle and 7.1-12.5 g/sec at 2500 RPM. If MAF reading is as specified, go to next step. If MAF reading is not as specified, repair MAF sensor or circuit. See «DTC P0100: MASS AIRFLOW (MAF) SENSOR»(ref-3086-S42305467572000041700000).
  10. Check for possible causes of rough idle. See «ROUGH IDLE»(ref-3088-S35254473402000041700000) under SYMPTOMS in TROUBLE SHOOTING - NO CODES article. Repair as necessary and retest system. Clear any DTCs that may have been set by performing tests. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 12) Disconnect ECM and knock sensor harness connectors. see scheme 1and (Scheme 21). Check continuity of White wire between knock sensor harness connector terminal No. 1 and ECM harness connector terminal No. 81. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  2. Inspect knock sensor for physical damage. Measure resistance between ground and knock sensor terminal No. 1. Resistance should be 500-620 k/ohms at 68°F (20°C). Replace knock sensor if resistance is not as specified or if knock sensor has been dropped or damaged. If knock sensor is okay, go to next step.
  3. Reconnect all harness connectors. Disconnect Gray, 8-pin connector F-6. (Scheme 12) Check continuity between engine ground and connector F-6 terminal No. 2. (Scheme 22) Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 21

Scheme 21
Scheme 21

Scheme 22

Scheme 22
Scheme 22
  1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 12) Disconnect CKP sensor and ECM harness connectors. see scheme 1and (Scheme 23). Check continuity of White wire between CKP sensor harness connector terminal No. 2 and ECM harness connector terminal No. 65. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  2. Reconnect ECM harness connector. Check continuity between engine ground and CKP sensor harness connector terminal No. 1 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  3. Disconnect Gray, 8-pin connector F-6. (Scheme 12) Check continuity between engine ground and connector F-6 terminal No. 8. (Scheme 22) Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  4. For DTC P0335, go to next step. For DTC P1336, loosen and retighten CKP sensor mounting bolt. Retest system. If problem still exists, go to next step.
  5. Remove CKP sensor. Inspect CKP sensor for chipping. Measure resistance between CKP sensor terminals. Resistance should be 166-204 ohms at 68°F (20°C). Replace CKP sensor, if it is chipped or if resistance is not as specified. If CKP sensor is okay, go to next step.
  6. For DTC P0335, go to next step. For DTC P1336, inspect flywheel or drive plate teeth for damaged teeth. Replace flywheel or drive plate, if necessary. If flywheel or drive plate is okay, go to next step.
  7. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 23

Scheme 23
Scheme 23
  1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 12) Disconnect distributor 6-pin harness connector (for CMP sensor). Turn ignition on. Measure voltage between ground and CMP sensor harness connector terminal No. 2 (White wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of the following: Black/White wire between CMP sensor harness connector terminal No. 3 and ECM harness connector terminal No. 85. Blue wire between CMP sensor harness connector terminal No. 4 and ECM harness connector terminals No. 66 and 75. see scheme 2and (Scheme 24). Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
  3. Check continuity between engine ground and CMP sensor harness connector terminal No. 1 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  4. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between engine ground and ECM terminals No. 66, 75 and 85 by backprobing, with engine at specified speeds. See «PIN VOLTAGE CHARTS»(ref-3090) article. If waveforms are as specified, go to next step. If waveforms are not as specified, replace distributor assembly and retest system.
  5. Turn ignition off. Disconnect Blue, 12-pin Joint Connector (J/C) No. 1 (connector F-19). (Scheme 12) Check continuity between ground and connector F-19 terminal No. 1. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Also check circuit for short to voltage. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  6. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 24

Scheme 24
Scheme 24
  1. Check exhaust system for leaks. Repair as necessary and retest system. If no leaks are found, turn ignition off. Disconnect EGR-VCV harness connector. (Scheme 17) Turn ignition on. Measure voltage between ground and EGR-VCV harness connector terminals No. 2 and 5 (Green/White wires). (Scheme 25) If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of the following: Light Blue wire between EGR-VCV harness connector terminal No. 1 and ECM harness connector terminal No. 8. Red/White wire between EGR-VCV harness connector terminal No. 3 and ECM harness connector terminal No. 17. White/Black wire between EGR-VCV harness connector terminal No. 4 and ECM harness connector terminal No. 9. Green/Red wire between EGR-VCV harness connector terminal No. 6 and ECM harness connector terminal No. 18. see scheme 2and (Scheme 25). Also check circuits for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
  3. Check EGR passages for blockages or leaks. Repair as necessary and retest system. If EGR passages are okay, remove EGR temperature sensor. (Scheme 17) Measure resistance between EGR temperature sensor terminals, with sensor at specified temperatures. See «EGR TEMPERATURE SENSOR RESISTANCE»(ref-3086-S37250455482000050400000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace EGR temperature sensor and retest system.
  4. Measure resistance between EGR-VCV terminals No. 2 and 1, No. 2 and 3, No. 5 and 4, and No. 5 and 6. (Scheme 25) Resistance should be 20.9-23.1 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace EGR-VCV and retest system.
  5. Remove EGR-VCV. Reconnect all harness connectors. While observing EGR-VCV shaft, turn ignition on and off. EGR-VCV shaft should move smoothly forward and backward according to ignition switch position. If operation is as specified, go to next step. If operation is not as specified, replace EGR-VCV and retest system.
  6. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Temperature °F (°C)K/Ohms
32 (0)620-1050
122 (50)65-94
212 (100)11-15

EGR TEMPERATURE SENSOR RESISTANCE

Scheme 25

Scheme 25
Scheme 25
  1. Turn ignition off. Disconnect EGR-VCV harness connector. (Scheme 17) Turn ignition on. Measure voltage between ground and EGR-VCV harness connector terminals No. 2 and 5 (Green/White wires). (Scheme 25) If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of the following: Light Blue wire between EGR-VCV harness connector terminal No. 1 and ECM harness connector terminal No. 8. Red/White wire between EGR-VCV harness connector terminal No. 3 and ECM harness connector terminal No. 17. White/Black wire between EGR-VCV harness connector terminal No. 4 and ECM harness connector terminal No. 9. Green/Red wire between EGR-VCV harness connector terminal No. 6 and ECM harness connector terminal No. 18. see scheme 2and (Scheme 25). Also check circuits for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
  3. Measure resistance between EGR-VCV terminals No. 2 and 1, No. 2 and 3, No. 5 and 4, and No. 5 and 6. (Scheme 25) Resistance should be 20.9-23.1 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace EGR-VCV and retest system.
  4. Remove EGR-VCV. Reconnect all harness connectors. While observing EGR-VCV shaft, turn ignition on and off. EGR-VCV shaft should move smoothly forward and backward according to ignition switch position. If operation is as specified, go to next step. If operation is not as specified, replace EGR-VCV and retest system.
  5. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Inspect exhaust system for damage and repair as necessary. Start engine and let it idle. Check for exhaust leaks before 3-way catalyst. Check for intake air leaks after MAF sensor. Repair as necessary and retest system. If no problems are found, go to next step.
  2. Check ignition timing. See «ON-VEHICLE ADJUSTMENTS»(ref-4039) article. Adjust, if necessary and retest system. If ignition timing is okay, turn engine off and turn ignition on. Measure voltage between ground and ECM terminals No. 101, 103, 105 and 107 by backprobing. see scheme 1and see scheme 2. If battery voltage exists, go to next step. If battery voltage does not exist, repair appropriate injector or circuit. See «FUEL SYSTEM»(ref-3089-S14351516162000041700000) in SYSTEM & COMPONENT TESTING article.
  3. 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, repair ignition system as necessary. See «DTC P1320: IGNITION SIGNAL»(ref-3086-S27415444062000041700000).
  4. Turn ignition off. Remove injector assembly. Keep all associated fuel lines connected. Disconnect 6-pin distributor harness connector. Turn ignition on. Verify fuel is not dripping from injectors. Replace injectors which are leaking. If no injectors are leaking, go to next step.
  5. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect EVAP-CPVCV harness connector. see scheme 20 Measure voltage between ground and EVAP-CPVCV harness connector terminal No. 1 (Brown wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of Pink wire between EVAP-CPVCV harness connector terminal No. 2 and ECM harness connector terminal No. 14. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. see scheme 21 Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCV and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect EVAP-CVCV harness connector. see scheme 17 Turn ignition on. Measure voltage between ground and EVAP-CVCV harness connector terminal No. 1 (Brown wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of Purple/White wire between EVAP-CVCV harness connector terminal No. 2 and ECM harness connector terminal No. 102. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 26) If rust exists, replace EVAP-CVCV and retest system. If rust does not exist, go to next step.
  4. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 26) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to step 6. If operation is not as specified, go to next step.
  5. Clean EVAP-CVCV ports with compressed air. Repeat step 4. If EVAP-CVCV still does not operate as specified, replace EVAP-CVCV and retest system. If EVAP-CVCV is okay, go to next step.
  6. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 26

Scheme 26
Scheme 26
  1. Check EVAP-CSPS hose for blockage or leak. see scheme 17 Repair as necessary and retest system. If hose is okay, loosen and retighten engine ground bolts. (Scheme 12) 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 terminal No. 1 (Pink/Blue wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between ECM and EVAP-CSPS. Retest system.
  3. Turn ignition off. Check continuity between engine ground and EVAP-CSPS harness connector terminal No. 3 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  4. Disconnect ECM harness connector. see scheme 1 Check continuity of White wire between EVAP-CSPS harness connector terminal No. 2 and ECM harness connector terminal No. 84. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  5. Remove EVAP-CPVCV. see scheme 20 Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. see scheme 21 Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCV and retest system.
  6. Disconnect EVAP-CVCV hose. see scheme 17 Check hose for blockage. Repair as necessary and retest system. If hose is okay, remove EVAP-CVCV. Check for rust in port "B". (Scheme 26) If rust exists, replace EVAP-CVCV and retest system. If rust does not exist, go to next step.
  7. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 26) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to step 9. If operation is not as specified, go to next step.
  8. Clean EVAP-CVCV ports with compressed air. Repeat step 7. If EVAP-CVCV still does not operate as specified, replace EVAP-CVCV and retest system. If EVAP-CVCV is okay, go to next step.
  9. Remove EVAP-CSPS with its harness connector connected. see scheme 17 Turn ignition on. Using a hand vacuum pump, apply 2.76 in. Hg (9.3 kPa) of vacuum to EVAP-CSPS. Measure voltage between ground and ECM terminal No. 84 by backprobing. see scheme 1and see scheme 2. Voltage should be.4-.6 volt. Disconnect vacuum pump. Voltage should be 3.0-3.6 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS and retest system.
  10. Remove water separator and inspect for cracks or blockage. see scheme 17 With water separator port "A" plugged, blow air into port "B". see scheme 18 Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator and retest system.
  11. 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 13. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 13.
  12. Inspect EVAP canister for damage. Replace, if necessary. Also check hose between water separator and EVAP canister for blockage or leak. Repair as necessary and retest system. If EVAP canister and hose are okay, go to next step.
  13. Reconnect all harness connectors. Disconnect Gray, 8-pin tail sub-harness connector (connector T-20) located under rear of trunk. Check continuity between engine ground and connector T-20 terminal No. 8. (Scheme 22) Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If shield circuit is okay, go to next step.
  14. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Turn ignition off. Disconnect fuel level sensor/FTT sensor harness connector located behind access cover under rear seat. Turn ignition on. Measure voltage between ground and fuel level sensor/FTT sensor harness connector terminal No. 4 (Green/Red wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between fuel level sensor and instrument cluster. Retest system.
  2. Turn ignition off. Check continuity between body ground and fuel level sensor/FTT sensor harness connector terminal No. 1 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  3. Disconnect ECM harness connector. see scheme 1 Check continuity of the following: Green/Red wire between fuel level sensor/FTT sensor harness connector terminal No. 4 and ECM harness connector terminal No. 83. Black wire between fuel level sensor/FTT sensor harness connector terminal No. 1 and ECM harness connector terminal No. 90. see scheme 2 Also check circuits for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
  4. Remove fuel level sensor from fuel tank. Measure resistance between fuel level sensor/FTT sensor terminals No. 1 and 4, with sensor at specified positions. See «FUEL LEVEL SENSOR RESISTANCE»(ref-3086-S30486924282000050900000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace fuel level sensor and retest system.
  5. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Float Position(1) Ohms
Full (2)4-6
1/230-34
Empty (2)80-83
(1) Approximate resistance. (2) When float rod is in contact with stop.
(1)Approximate resistance.
(2)When float rod is in contact with stop.

FUEL LEVEL SENSOR RESISTANCE

Perform step 4 in PROCEDURE under DTC P0460: FUEL LEVEL SENSOR FUNCTION (SLOSH).

See PROCEDURE under DTC P0460: FUEL LEVEL SENSOR FUNCTION (SLOSH).

  1. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Remove instrument cluster and disconnect Brown 16-pin harness connector. Check continuity of Yellow/Green wire between instrument cluster Brown 16-pin harness connector terminal No. 32 and ECM harness connector terminal No. 86. see scheme 2and (Scheme 27). Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  2. Reconnect all harness connectors. Check speedometer operation. If speedometer operates, go to next step. If speedometer does not operate, repair VSS or circuit. See INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
  3. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 27

Scheme 27
Scheme 27
  1. Turn ignition off. Disconnect IACV-AAC valve harness connector. (Scheme 17) Turn ignition on. Measure voltage between ground and IACV-AAC valve harness connector terminals No. 2 and 5 (Green/White wires). (Scheme 25) If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of the following: Brown wire between IACV-AAC valve harness connector terminal No. 1 and ECM harness connector terminal No. 6. Red wire between IACV-AAC valve harness connector terminal No. 3 and ECM harness connector terminal No. 15. Blue wire between IACV-AAC valve harness connector terminal No. 4 and ECM harness connector terminal No. 7. Green wire between IACV-AAC valve harness connector terminal No. 6 and ECM harness connector terminal No. 16. see scheme 2 Also check circuits for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
  3. Reconnect all harness connectors. Disconnect power steering air control valve hose from air intake duct. (Scheme 28) Start engine and let it idle. Check for vacuum at hose. If vacuum exists, replace power steering air control valve and retest system. If vacuum does not exist, go to next step.
  4. Check for vacuum when steering wheel is turned. If vacuum exists, go to next step. If vacuum does not exist, check for blockage or leak in power steering air control valve vacuum hoses. (Scheme 29) Also check intake manifold vacuum port for blockage. Repair as necessary and retest system. If no problems are found, go to next step.
  5. Turn ignition off. Disconnect IACV-AAC valve harness connector. Measure resistance between IACV-AAC valve terminals No. 2 and 1, No. 2 and 3, No. 5 and 4, and No. 5 and 6. (Scheme 25) Resistance should be about 22 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace IACV-AAC valve and retest system.
  6. Reconnect IACV-AAC valve harness connector. While turning ignition on and off, listen to IACV-AAC valve for operating sound in response to ignition switch position. If operating sound is heard, go to next step. If operating sound is not heard, replace IACV-AAC valve and retest system.
  7. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) 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 closed Throttle Position (TP) switch harness connector. (Scheme 16) Turn ignition on. Measure voltage between engine ground and closed TP switch harness connector terminal No. 5 (Brown wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of Yellow wire between ECM harness connector terminal No. 40 and closed TP switch harness connector terminal No. 4. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. Reconnect all harness connectors. Check ignition timing and idle speed. See «ON-VEHICLE ADJUSTMENTS»(ref-4039) article. Adjust, if necessary. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose from throttle opener. (Scheme 17) Using a hand vacuum pump, apply vacuum to throttle opener until throttle opener rod does not contact throttle drum. Disconnect closed TP switch harness connector. Check continuity between closed TP switch terminals No. 4 and 5. (Scheme 30) Continuity should exist when throttle is closed. Continuity should not exist when throttle is open. If continuity is as specified, go to step 5. If continuity is not as specified, go to next step.
  4. Adjust throttle position switch. See «ON-VEHICLE ADJUSTMENTS»(ref-4039) article. If adjustment is not possible, replace throttle position switch and retest system. If adjustment is possible, go to next step.
  5. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose from throttle opener. (Scheme 17) Using a hand vacuum pump, apply vacuum to throttle opener until throttle opener rod does not contact throttle drum. Turn ignition on. Measure voltage between ground and ECM terminal No. 92 by backprobing, with throttle in specified positions. See «THROTTLE POSITION (TP) SENSOR VOLTAGE»(ref-3086-S18467893182000051000000) table. If voltage is as specified, go to next step. If voltage is not as specified, adjust TP sensor, if possible. See «ON-VEHICLE ADJUSTMENTS»(ref-4039) article. If TP sensor can not be adjusted, replace TP sensor and retest system.
  6. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Throttle PositionVolts
Fully Closed.2-.8
Partially Opened.2-.8 To 3.5-4.5
Fully Open3.5-4.5

THROTTLE POSITION (TP) SENSOR VOLTAGE

Scheme 30

Scheme 30
Scheme 30
  1. Turn ignition off. Disconnect ECM and TCM harness connectors. see scheme 1and (Scheme 31). Check continuity between the following: Yellow/Red wire between ECM harness connector terminal No. 54 and TCM harness connector terminal No. 5. Yellow/Green wire between ECM harness connector terminal No. 55 and TCM harness connector terminal No. 6. Yellow/Black wire between ECM harness connector terminal No. 10 and TCM harness connector terminal No. 7. Brown/White wire between ECM harness connector terminal No. 19 and TCM harness connector terminal No. 8. Green/Yellow wire between ECM harness connector terminal No. 56 and TCM harness connector terminal No. 9. see scheme 2and (Scheme 32). Also check circuits for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
  2. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 31

Scheme 31
Scheme 31

Scheme 32

Scheme 32
Scheme 32

Turn ignition on. Clear ECM memory. Perform DTC CONFIRMATION TEST . If DTC P0605 is still present in ECM memory, replace ECM. If DTC P0605 is not present in ECM memory, test is complete.

Remove ECT sensor. (Scheme 15) Measure resistance between ECT sensor terminals, with sensor at specified temperatures. See ECT SENSOR RESISTANCE table. If resistance is as specified, test is complete. If resistance is not as specified, replace ECT sensor and retest system.

Temperature °F (°C)(1) Ohms
68 (20)2100-2900
122 (50)680-1000
194 (90)236-260
(1) Resistance should decrease as temperature increases. (Scheme 14)
(1)Resistance should decrease as temperature increases. (Scheme 14)

ECT SENSOR RESISTANCE

See DTC P0133: FRONT HEATED OXYGEN SENSOR (HO2S) .

  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 terminal No. 8 (Green/White wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect distributor 6-pin harness connector (for power transistor and CMP sensor). Check continuity between engine ground and distributor 6-pin harness connector terminal No. 5 (Black wire). (Scheme 24) Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  3. Disconnect ECM harness connector. see scheme 1 Check continuity of White/Black wire between distributor 6-pin harness connector terminal No. 6 and ECM harness connector terminal No. 35. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  4. Measure resistance between distributor 2-pin connector terminals. Also measure resistance between ignition coil tower and distributor 2-pin connector terminal No. 8. (Scheme 33) See «IGNITION COIL RESISTANCE»(ref-3086-S41667384662000041700000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace distributor assembly and retest system.
  5. To check power transistor, measure resistance between distributor 6-pin connector terminal No. 5 (component side) and distributor 2-pin connector terminal No. 7 (component side). If resistance is zero ohms, replace distributor assembly and retest system. If resistance is not zero ohms, go to next step.
  6. Turn ignition off. Disconnect distributor 2-pin harness connector. Disconnect ECM harness connector. see scheme 1 Check continuity of Green wire between distributor 2-pin harness connector terminal No. 7 and ECM harness connector terminal No. 36. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  7. Remove distributor cap. Measure resistance of resistor as shown in illustration. (Scheme 34) Resistance should be 4000-8000 ohms at 77°F (25°C). If resistance is as specified, go to next step. If resistance is not as specified, replace distributor cap and retest system.
  8. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
ApplicationResistance @ 77°F (25°C)
Primary (1)About 0.8 Ohm
Secondary (2)About 16K/Ohms
(1) Measured between distributor 2-pin connector terminals. (2) (Scheme 33)
(1)Measured between distributor 2-pin connector terminals.

IGNITION COIL RESISTANCE

Scheme 33

Scheme 33
Scheme 33

Scheme 34

Scheme 34
Scheme 34
  1. Turn ignition off. Disconnect EGR temperature sensor harness connector. (Scheme 17) Turn ignition on. Measure voltage between ground and EGR temperature sensor harness connector terminal No. 1 (Red/Black wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between ECM and EGR temperature sensor. Retest system.
  2. Turn ignition off. Check continuity between engine ground and EGR temperature sensor harness connector terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  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-3086-S26853259122000051000000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace EGR temperature sensor and retest system.
  4. Disconnect EGR Volume Control Valve (EGR-VCV) harness connector. (Scheme 17) Measure resistance between EGR-VCV terminals No. 2 and 1, No. 2 and 3, No. 5 and 4, and No. 5 and 6. (Scheme 25) Resistance should be 20.9-23.1 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace EGR-VCV and retest system.
  5. Remove EGR-VCV. Reconnect all harness connectors. While observing EGR-VCV shaft, turn ignition on and off. EGR-VCV shaft should move smoothly forward and backward according to ignition switch position. If operation is as specified, go to next step. If operation is not as specified, replace EGR-VCV and retest system.
  6. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Temperature °F (°C)K/Ohms
32 (0)620-1050
122 (50)65-94
212 (100)11-15

EGR TEMPERATURE SENSOR RESISTANCE

  1. Turn ignition off. Disconnect EGR-VCV harness connector. (Scheme 17) Turn ignition on. Measure voltage between ground and EGR-VCV harness connector terminals No. 2 and 5 (Green/White wires). (Scheme 25) If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of the following: Light Blue wire between EGR-VCV harness connector terminal No. 1 and ECM harness connector terminal No. 8. Red/White wire between EGR-VCV harness connector terminal No. 3 and ECM harness connector terminal No. 17. White/Black wire between EGR-VCV harness connector terminal No. 4 and ECM harness connector terminal No. 9. Green/Red wire between EGR-VCV harness connector terminal No. 6 and ECM harness connector terminal No. 18. see scheme 2and (Scheme 25). Also check circuits for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
  3. Remove EGR temperature sensor. (Scheme 17) Measure resistance between EGR temperature sensor terminals, with sensor at specified temperatures. See «EGR TEMPERATURE SENSOR RESISTANCE»(ref-3086-S26594754262000051000000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace EGR temperature sensor and retest system.
  4. Measure resistance between EGR-VCV terminals No. 2 and 1, No. 2 and 3, No. 5 and 4, and No. 5 and 6. (Scheme 25) Resistance should be 20.9-23.1 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace EGR-VCV and retest system.
  5. Remove EGR-VCV. Reconnect all harness connectors. While observing EGR-VCV shaft, turn ignition on and off. EGR-VCV shaft should move smoothly forward and backward according to ignition switch position. If operation is as specified, go to next step. If operation is not as specified, replace EGR-VCV and retest system.
  6. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Temperature °F (°C)K/Ohms
32 (0)620-1050
122 (50)65-94
212 (100)11-15

EGR TEMPERATURE SENSOR RESISTANCE

  1. Turn ignition off. Disconnect EVAP-CPVCV harness connector. see scheme 20 Measure voltage between ground and EVAP-CPVCV harness connector terminal No. 1 (Brown wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity of Pink wire between EVAP-CPVCV harness connector terminal No. 2 and ECM harness connector terminal No. 14. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. Check EVAP-CSPS hose for leak. see scheme 17 Repair as necessary and retest system. If hose is okay, disconnect EVAP-CSPS harness connector. If water exists in connector, replace EVAP-CSPS and retest system. If connector is okay, go to next step.
  4. Remove EVAP-CSPS with its harness connector connected. see scheme 17 Turn ignition on. Using a hand vacuum pump, apply 2.76 in. Hg (9.3 kPa) of vacuum to EVAP-CSPS. Measure voltage between ground and ECM terminal No. 84 by backprobing. see scheme 1and see scheme 2. Voltage should be.4-.6 volt. Disconnect vacuum pump. Voltage should be 3.0-3.6 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS and retest system.
  5. Remove EVAP-CPVCV. see scheme 20 Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. see scheme 21 Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCV and retest system.
  6. Disconnect EVAP-CVCV hose. see scheme 17 Check hose for blockage. Repair as necessary and retest system. If hose is okay, remove EVAP-CVCV. Check for rust in port "B". (Scheme 26) If rust exists, replace EVAP-CVCV and retest system. If rust does not exist, go to next step.
  7. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 26) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to step 9. If operation is not as specified, go to next step.
  8. Clean EVAP-CVCV ports with compressed air. Repeat step 7. If EVAP-CVCV still does not operate as specified, replace EVAP-CVCV and retest system. If EVAP-CVCV is okay, go to next step.
  9. 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 12. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 12.
  10. Inspect EVAP canister for damage. Replace, if necessary. Also check hose between water separator and EVAP canister for blockage or leak. Repair as necessary and retest system. If EVAP canister and hose are okay, go to next step.
  11. Remove water separator and inspect for cracks or blockage. see scheme 17 With water separator port "A" plugged, blow air into port "B". see scheme 18 Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator and retest system.
  12. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Disconnect EVAP-CVCV hose. see scheme 17 Check hose for blockage. Repair as necessary and retest system. If hose is okay, go to next step.
  2. Remove water separator and inspect for cracks or blockage. see scheme 17 With water separator port "A" plugged, blow air into port "B". see scheme 18 Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator and retest system.
  3. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 26) If rust exists, replace EVAP-CVCV and retest system. If rust does not exist, go to next step.
  4. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 26) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to step 6. If operation is not as specified, go to next step.
  5. Clean EVAP-CVCV ports with compressed air. Repeat step 4. If EVAP-CVCV still does not operate as specified, replace EVAP-CVCV and retest system. If EVAP-CVCV is okay, go to next step.
  6. 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 8. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 8.
  7. Inspect EVAP canister for damage. Replace, if necessary. Also check hose between water separator and EVAP canister for blockage or leak. Repair as necessary and retest system. If EVAP canister and hose are okay, go to next step.
  8. Check EVAP-CSPS hose for leak. see scheme 17 Repair as necessary and retest system. If hose is okay, disconnect EVAP-CSPS harness connector. If water exists in connector, replace EVAP-CSPS and retest system. If connector is okay, go to next step.
  9. Remove EVAP-CSPS with its harness connector connected. see scheme 17 Turn ignition on. Using a hand vacuum pump, apply 2.76 in. Hg (9.3 kPa) of vacuum to EVAP-CSPS. Measure voltage between ground and ECM terminal No. 84 by backprobing. see scheme 1and see scheme 2. Voltage should be.4-.6 volt. Disconnect vacuum pump. Voltage should be 3.0-3.6 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS and retest system.
  10. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Inspect EVAP canister for cracks. Replace, if necessary and retest system. If EVAP canister is not cracked, go to next step.
  2. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect EVAP-CPVCV hose from EVAP service port. see scheme 19and see scheme 20. Start engine and let it idle for at least 80 seconds. While quickly increasing engine speed to 2000 RPM, check for vacuum at EVAP-CPVCV hose. Vacuum should exist. If vacuum does not exist, go to next step. If vacuum exists, go to step 4.
  3. Check EVAP purge hose for blockage or improper connections. Also check intake manifold purge port for blockage. Repair as necessary and retest system. If no problems are found, go to next step.
  4. Turn ignition off. Remove EVAP-CPVCV. Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. see scheme 21 Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCV and retest system.
  5. Check EVAP-CSPS hose for leak. see scheme 17 Repair as necessary and retest system. If hose is okay, disconnect EVAP-CSPS harness connector. If water exists in connector, replace EVAP-CSPS and retest system. If connector is okay, go to next step.
  6. Remove EVAP-CSPS with its harness connector connected. see scheme 17 Turn ignition on. Using a hand vacuum pump, apply 2.76 in. Hg (9.3 kPa) of vacuum to EVAP-CSPS. Measure voltage between ground and ECM terminal No. 84 by backprobing. see scheme 1and see scheme 2. Voltage should be.4-.6 volt. Disconnect vacuum pump. Voltage should be 3.0-3.6 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS and retest system.
  7. Disconnect EVAP-CVCV hose. see scheme 17 Check hose for blockage. Repair as necessary and retest system. If hose is okay, remove EVAP-CVCV. Check for rust in port "B". (Scheme 26) If rust exists, replace EVAP-CVCV and retest system. If rust does not exist, go to next step.
  8. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 26) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to step 10. If operation is not as specified, go to next step.
  9. Clean EVAP-CVCV ports with compressed air. Repeat step 8. If EVAP-CVCV still does not operate as specified, replace EVAP-CVCV and retest system. If EVAP-CVCV is okay, go to next step.
  10. Install all removed parts. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose from throttle opener. (Scheme 17) Using a hand vacuum pump, apply vacuum to throttle opener until throttle opener rod does not contact throttle drum. Disconnect closed Throttle Position (TP) switch harness connector. Check continuity between closed TP switch terminals No. 4 and 5. (Scheme 30) Continuity should exist when throttle is closed. Continuity should not exist when throttle is open. If continuity is as specified, go to step 12. If continuity is not as specified, go to next step.
  11. Adjust throttle position switch. See «ON-VEHICLE ADJUSTMENTS»(ref-4039) article. If adjustment is not possible, replace throttle position switch and retest system. If adjustment is possible, go to next step.
  12. Check EVAP purge line for evidence of leaks. Repair as necessary and retest system. If no leaks are found, clean EVAP purge line with compressed air. Go to next step.
  13. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Disconnect EVAP-CVCV hose. see scheme 17 Check hose for blockage. Repair as necessary and retest system. If hose is okay, remove EVAP-CVCV. Check for rust in port "B". (Scheme 26) If rust exists, replace EVAP-CVCV and retest system. If rust does not exist, go to next step.
  2. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 26) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to step 4. If operation is not as specified, go to next step.
  3. Clean EVAP-CVCV ports with compressed air. Repeat step 2. If EVAP-CVCV still does not operate as specified, replace EVAP-CVCV and retest system. If EVAP-CVCV is okay, go to next step.
  4. Remove vacuum cut valve. see scheme 17 Plug ports "C" and "D" with fingers. (Scheme 35) 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. Remove fingers from ports "C" and "D". Blow air in port "A". Air should flow freely out of port "C". Blow air in port "B". Air should flow freely out of port "D". If operation is as specified, go to next step. If operation is not as specified, replace vacuum cut valve and retest system.
  5. 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 7. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 7.
  6. Inspect EVAP canister for damage. Replace, if necessary. Also check hose between water separator and EVAP canister for blockage or leak. Repair as necessary and retest system. If EVAP canister and hose are okay, go to next step.
  7. Check EVAP-CSPS hose for leak. see scheme 17 Repair as necessary and retest system. If hose is okay, disconnect EVAP-CSPS harness connector. If water exists in connector, replace EVAP-CSPS and retest system. If connector is okay, go to next step.
  8. Remove EVAP-CSPS with its harness connector connected. see scheme 17 Turn ignition on. Using a hand vacuum pump, apply 2.76 in. Hg (9.3 kPa) of vacuum to EVAP-CSPS. Measure voltage between ground and ECM terminal No. 84 by backprobing. see scheme 1and see scheme 2. Voltage should be.4-.6 volt. Disconnect vacuum pump. Voltage should be 3.0-3.6 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS and retest system.
  9. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 35

Scheme 35
Scheme 35
  1. Turn ignition off. Disconnect ECM harness connector. see scheme 1 Check continuity between body ground and ECM harness connector terminal No. 90. see scheme 2 Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  2. Remove access cover located under rear seat. Remove fuel level sensor from fuel tank. Measure resistance between fuel level sensor/FTT sensor terminals No. 1 (Black wire) and No. 4 (Green/Red wire), with sensor at specified positions. See «FUEL LEVEL SENSOR RESISTANCE»(ref-3086-S02183127082000051100000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace fuel level sensor and retest system.
  3. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Float Position(1) Ohms
Full (2)4-6
1/230-34
Empty (2)80-83
(1) Approximate resistance. (2) When float rod is in contact with stop.
(1)Approximate resistance.
(2)When float rod is in contact with stop.

FUEL LEVEL SENSOR RESISTANCE

  1. Turn ignition off. Disconnect vacuum cut valve by-pass valve harness connector. see scheme 17 Turn ignition on. Measure voltage between ground and vacuum cut valve by-pass valve harness connector terminal No. 1 (Brown wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article.
  2. Turn ignition off. Disconnect ECM harness connector. see scheme 2 Check continuity of Purple/Red wire between vacuum cut valve by-pass valve harness connector terminal No. 2 and ECM harness connector terminal No. 2. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. Remove vacuum cut valve by-pass valve. Using jumper wires, apply battery voltage to valve terminals. (Scheme 36) Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. Vacuum cut valve by-pass valve should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, replace vacuum cut valve by-pass valve and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 36

Scheme 36
Scheme 36
  1. Remove vacuum cut valve and vacuum cut valve by-pass valve as an assembly. see scheme 17 Apply vacuum to port "A". (Scheme 35) 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. Apply battery voltage to by-pass valve terminals. 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 4.
  2. Check purge line between EVAP canister and fuel tank for blockage or leak. Repair as necessary and retest system. If purge line is okay, check fuel tank purge port for blockage. Clean as necessary and retest system. If purge port is okay, go to next step.
  3. Remove hoses from EVAP canister ports "A" and "B". (Scheme 37) Pinch EVAP-CVCV hose and blow air into port "A". Air should flow freely out of port "B". If operation is as specified, go to step 7. If operation is not as specified, replace EVAP canister and retest system.
  4. Remove by-pass hoses from vacuum cut valve. Check hoses for blockage. Repair as necessary and retest system. If by-pass hoses are okay, go to next step.
  5. Plug vacuum cut valve ports "C" and "D" with fingers. (Scheme 35) 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. Remove fingers from ports "C" and "D". Blow air in port "A". Air should flow freely out of port "C". Blow air in port "B". Air should flow freely out of port "D". If operation is as specified, go to next step. If operation is not as specified, replace vacuum cut valve and retest system.
  6. Check EVAP-CSPS hose for leak. see scheme 17 Repair as necessary and retest system. If hose is okay, disconnect EVAP-CSPS harness connector. If water exists in connector, replace EVAP-CSPS and retest system. If connector is okay, go to next step.
  7. Remove EVAP-CSPS with its harness connector connected. see scheme 17 Turn ignition on. Using a hand vacuum pump, apply 2.76 in. Hg (9.3 kPa) of vacuum to EVAP-CSPS. Measure voltage between ground and ECM terminal No. 84 by backprobing. see scheme 1and see scheme 2. Voltage should be.4-.6 volt. Disconnect vacuum pump. Voltage should be 3.0-3.6 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS and retest system.
  8. Disconnect EVAP-CVCV hose. see scheme 17 Check hose for blockage. Repair as necessary and retest system. If hose is okay, remove EVAP-CVCV. Check for rust in port "B". (Scheme 26) If rust exists, replace EVAP-CVCV and retest system. If rust does not exist, go to next step.
  9. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 26) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to step 11. If operation is not as specified, go to next step.
  10. Clean EVAP-CVCV ports with compressed air. Repeat step 9. If EVAP-CVCV still does not operate as specified, replace EVAP-CVCV and retest system. If EVAP-CVCV is okay, go to next step.
  11. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Testing EVAP Canister. Scheme 37

Scheme 37: Testing EVAP Canister
Scheme 37: Testing EVAP Canister
  1. Turn ignition off. Disconnect ECM and TCM harness connectors. see scheme 1and (Scheme 31). Check continuity of Purple wire between ECM harness connector terminal No. 91 and TCM harness connector terminal No. 15. see scheme 2and (Scheme 32). Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  2. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Procedure (A/T)

  1. Turn ignition off. Disconnect PNP switch harness connector. (Scheme 38) Check continuity between ground and PNP switch harness connector terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  2. Disconnect ECM harness connector. see scheme 1 Check continuity of Green/Orange wire between PNP switch harness connector terminal No. 1 and ECM harness connector terminal No. 42. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. Check continuity between PNP switch terminals No. 1 and 2. (Scheme 38) With transmission in Park or Neutral, continuity should exist, With transmission in any other gear, continuity should not exist. If continuity is as specified, go to step 6. If continuity is not as specified, go to next step.
  4. Disconnect gearshift cable and repeat step 3. If continuity is now as specified, adjust gearshift cable and retest system. See AUTOMATIC TRANSMISSION article in TRANSMISSION SERVICING. If continuity is still not as specified, go to next step.
  5. Remove PNP switch and repeat step 3. If continuity is now as specified, adjust PNP switch and retest system. See AUTOMATIC TRANSMISSION article in TRANSMISSION SERVICING. If continuity is still not as specified, replace PNP switch and retest system.
  6. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 38

Scheme 38
Scheme 38

Procedure (M/T)

  1. Turn ignition off. Disconnect PNP switch harness connector. (Scheme 39) Check continuity between body ground and PNP switch harness connector terminal No. 2 (Black wire). Also check circuit for short to voltage. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-3095) article. Repair as necessary and retest system. If ground circuit is okay, go to next step.
  2. Disconnect ECM harness connector. see scheme 1 Check continuity of Green/Orange wire between PNP switch harness connector terminal No. 1 and ECM harness connector terminal No. 42. see scheme 2 Also check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
  3. Check continuity between PNP 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 PNP switch and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See «TESTING PROCEDURE»(ref-3085-S33644654112000041700000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Scheme 39

Scheme 39
Scheme 39

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