Engine Controls - Self-Diagnostics - Testing - Q45: Diagnosis Infiniti Q45 II

DTC Confirmation

Depending on equipment available, use one of the following to set DTC

1. Using GST, turn ignition on. Wait 6 seconds then select MODE 7.
2. Using MIL, turn ignition on. Wait 6 seconds and turn ignition off. Wait at least 5 seconds and turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

Conditions for setting DTC are

1. Excessively high voltage from MAF sensor is sent to PCM when engine is not running or running under light load conditions.
2. Excessively low voltage from MAF sensor is sent to PCM when engine is running or running under heavy load conditions.

Diagnostic Procedure

1. Check intake air ducting for leakage, disconnect hoses and air. Repair as necessary.
2. Check Power Supply - Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 9) Turn ignition on. Measure voltage between MAF sensor harness connector terminal No. 3 (Red/Green wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, check for fault in Red/Green wire between MAF sensor and PCM, and between MAF sensor and ECCS relay. Repair harness or connectors as necessary.
3. Check Ground Circuit - Turn ignition off. Disconnect PCM harness connector. Check continuity between MAF sensor connector terminal No. 2 (Black wire) and PCM terminal No. 62. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
4. Check Input Signal Circuit - Check continuity of White wire between MAF sensor connector terminal No. 1 and PCM harness connector terminal No. 65. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
5. Check Component & Circuits - Ensure MAF sensor hot wire is not damaged or contaminated. Check PCM and MAF sensor harness connectors for damage, corrosion or pushed-out pins. Loosen and retighten engine ground bolts. (Scheme 10) Repair if necessary. If no problems are found, go to next step.
6. Start engine and allow to idle. Measure voltage between MAF sensor harness connector terminal No. 1 and ground. (Scheme 9) Voltage should be as follows: Key on, engine off; less than one volt. Key on, engine idling; 1.0-1.7 volts. At 2500 RPM; about 2.1 volts. From idle to about 4000 RPM; 1.9-1.7 volts to about 4 volts. If voltage is not as specified, remove MAF sensor. Check for hot wire for damage or contamination. Repair or replace MAF sensor.

Scheme 9

Scheme 10

Depending on equipment available, use one of the following to set DTC

1. Using GST, turn ignition on. Wait 6 seconds then select MODE 7. If DTC does not reset, turn ignition off for at least 5 seconds. Start engine and allow to idle for 15 seconds and repeat this confirmation procedure.
2. Using MIL, turn ignition on. Wait 5 seconds and turn ignition off. Wait at least 5 seconds and turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If DTC does not reset, start engine and allow to idle for 15 seconds and repeat this confirmation procedure.

Conditions for setting DTC are

1. Excessively low or high voltage from sensor is sent to PCM.
2. High voltage from sensor is sent to PCM under light load driving conditions.
3. Low voltage from sensor is sent to PCM under heavy load driving conditions.

1. Turn ignition off. Disconnect AP sensor harness connector. Turn ignition on. Measure voltage between sensor harness connector Brown/White wire terminal and ground. If 5 volts is present, go to next step. If 5 volts is not present, repair harness or connectors as necessary.
2. Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Check for continuity between AP sensor connector Black wire terminal and ground. If continuity is present, go to next step. If continuity is not present, repair Black wire between AP sensor and PCM or Transmission Control Module (TCM).
3. Check Input Signal Circuit - Leave ignition off. Disconnect PCM harness connector. Check continuity between AP sensor connector White/Red wire terminal and PCM harness connector terminal No. 64. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
4. Check Component - Connect DVOM between PCM terminals No. 64 (White/Red wire) and No. 128 (PCM ground). Turn ignition on. Reading should be greater than 2.6 volts. Start engine and wait at least 5 seconds. Reading should be less than previous reading. If readings are not as specified, go to next step. If readings are as specified, circuit is okay.
5. Turn ignition off. Remove AP sensor, leaving it connected. Remove vacuum hose to AP sensor. Turn ignition on. DVOM reading should be 3.2-4.8 volts. Connect vacuum pump to AP sensor and apply 7.9 in. Hg to sensor. DVOM reading should drop 1.0-1.4 volts. If voltage is not as specified, replace sensor. If voltage drop is as specified, check vacuum hoses for damage or poor connections. If no faults are found, check vacuum source for restriction.

Depending on equipment available, use one of the following to set DTC

1. Using GST, turn ignition on. Wait 5 seconds then select MODE 7. If DTC does not reset, turn ignition off. Allow engine to cool. Wait until engine coolant temperature is well below 194°F (90°C). Turn ignition on. Select MODE 1. Ensure engine coolant temperature remains less than 194°F (90°C) during this procedure; start engine and turn TCS switch to OFF position. Hold vehicle speed to more than 43 MPH for 100 consecutive seconds, then select MODE 7 with GST.
2. Using MIL, turn ignition on. Wait 6 seconds and turn ignition off. Wait at least 5 seconds and turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If DTC does not reset, turn ignition off. Allow engine to cool. Wait until engine coolant temperature is significantly less than 194°F (90°C). Turn ignition on. Ensure voltage between ground and PCM terminal No. 67 (Yellow/Black wire) is more than one volt while performing the following; start engine and turn TCS switch to OFF position. Hold vehicle speed to more than 43 MPH for 100 consecutive seconds. Turn ignition off for at least 5 seconds, then turn ignition on and retrieve codes.

Conditions for setting DTC are

1. Excessively low or high voltage from sensor is sent to PCM.
2. A rationally incorrect voltage from sensor is sent to PCM, as compared to ECT sensor input.

1. Turn ignition off. Disconnect IAT sensor harness connector. (Scheme 11) Turn ignition on. Measure voltage between IAT sensor harness connector terminal No. 2 (White/Purple wire) and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, verify harness continuity of White/Purple wire between IAT sensor and PCM. Repair harness or connectors as necessary.
2. Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Check IAT sensor harness continuity between terminal No. 1 (Black wire) and engine ground. If continuity is present, go to next step. If continuity is not present, repair Black wire between IAT sensor and PCM.
3. Check Component - Ensure IAT sensor is not damaged or contaminated. Check PCM and IAT sensor harness connectors for damage, corrosion or pushed-out pins. Repair if necessary. If no problems are found, go to next step.
4. Ensure ignition is off. Measure resistance between IAT sensor terminals as follows: With intake air temperature at 68°F (20°C), resistance should be 2100-2900 ohms. With intake air temperature at 176°F (80°C), resistance should be 270-380 ohms. If resistance is not as specified, replace IAT sensor. If resistance is as specified, inspect PCM connector and terminals for damage or corrosion. Repair or replace as necessary.

Scheme 11

Depending on equipment available, use one of the following to set DTC

1. Using GST, turn ignition on. Wait 6 seconds then select MODE 7. If DTC does not reset, turn ignition off for at least 5 seconds. Start and run engine at idle for 20 minutes. Select MODE 7 using GST.
2. Using MIL, turn ignition on. Wait 6 seconds and turn ignition off. Wait at least 5 seconds and turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If DTC does not reset, turn ignition off for at least 5 seconds. Start and run engine at idle for 20 minutes then retrieve DTCs using MIL.

Conditions for setting DTC are

1. Excessively low or high voltage from sensor is sent to PCM.
2. A rationally incorrect voltage from sensor is sent to PCM.
3. ECT value is insufficient for closed loop fuel control.

1. Turn ignition off. Disconnect ECT sensor harness connector. (Scheme 12) Turn ignition on. Measure voltage between ECT sensor harness connector terminal No. 2 (Yellow/Black wire) and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, verify continuity of Yellow/Black wire between ECT sensor and PCM. Repair harness or connectors as necessary.
2. Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Check ECT sensor harness continuity between terminal No. 1 (Black wire) and engine ground. If continuity is present, go to next step. If continuity is not present, verify continuity of Black wire between ECT sensor and PCM. Repair harness or connectors as necessary.
3. Check Component - Ensure ECT sensor is not damaged or contaminated. Check PCM and ECT sensor harness connectors for damage, corrosion or pushed-out pins. Repair if necessary. If no problems are found, go to next step.
4. Ensure ignition is off. Disconnect ECT sensor. Measure resistance between ECT sensor terminals. Ensure resistance is as follows: Coolant temperature 68°F (20°C); 2100-2900 ohms. Coolant temperature 122°F (50°C); 680-1000 ohms. Coolant temperature 194°F (90°C); 236-260 ohms. If resistance is not as specified, replace ECT sensor.

Scheme 12

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and maintain more than 2 MPH with selector in any position except "P" or "N", then select MODE 7. If DTC does not reset, turn ignition off for at least 5 seconds. Start engine and allow it to idle for 10-15 seconds. Select MODE 7.
2. Using MIL, start engine and maintain more than 2 MPH with selector in any position except "P" or "N". Turn ignition off and wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If DTC does not reset, turn ignition off for at least 10 seconds. Start engine and allow it to idle for 10-15 seconds. Turn engine off for at least 5 seconds. Turn ignition on. Retrieve DTCs using MIL.

Conditions for setting DTC are

1. Excessively high or low voltage from sensor is sent to PCM.
2. High voltage from sensor is sent to PCM under light load driving conditions.
3. Low voltage from sensor is sent to PCM under heavy load driving conditions.

1. Turn ignition off. Disconnect TPS harness connector. (Scheme 13) Turn ignition on. Measure voltage between TPS connector terminal No. 4 (Brown/White wire) and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair Brown/White wire from PCM as necessary.
2. Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Check continuity between TPS connector terminal No. 2 (Black wire) and engine ground. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
3. Check Input Signal Circuit - Disconnect PCM harness connector. Verify continuity between TPS connector terminal No. 1 (Green wire) and PCM connector terminal No. 63. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
4. Check Component - Leave TP sensor disconnected. Check resistance across TP sensor connector terminals No. 2 and 3, while opening and closing throttle. (Scheme 13) See «THROTTLE POSITION SENSOR RESISTANCE»(ref-18056-S22336348812000122900000) table. If resistance is okay, go to «TESTS W/O CODES»(ref-18053) article for diagnosis by symptom. If resistance is not as specified, adjust TP sensor. See «ADJUSTMENTS»(ref-18052) article. If resistance is not as specified after adjustment, replace TP sensor.

THROTTLE POSITION SENSOR RESISTANCE

Scheme 13

1. Turn ignition off. Disconnect front HO2S harness connectors and PCM harness connector. see scheme 2and (Scheme 14). Check that continuity exists as follows: For left HO2S, check between PCM connector terminal No. 8 and HO2S connector terminal No. 2 (White wire). For right HO2S, check between PCM connector terminal No. 82 and HO2S connector terminal No. 2 (Red wire). Check continuity does not exist as follows: For left HO2S, check between ground and PCM connector terminal No. 83 (White wire) and HO2S connector terminal No. 2. For right HO2S, check between ground and PCM connector terminal No. 82 (Red wire) and HO2S connector terminal No. 2. If continuity is as specified, go to next step. If continuity is not as specified, repair harness or connectors as necessary.
2. Check Component - Start engine and bring to normal operating temperature. Connect DVOM between PCM terminal No. 128 (PCM ground) and terminal No. 82 (Red wire) for right HO2S, or terminal No. 83 (White wire) for left HO2S. see scheme 2 Hold engine speed at about 2000 RPM. The following conditions should be met: Maximum voltage is greater than.6 volt one time. Minimum voltage is less than.35 volt one time. Voltage does not exceed one volt. Vehicle is operating in closed loop. See FUEL FEEDBACK MONITORING USING MIL under ADDITIONAL SYSTEM FEATURES in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If these conditions were met, HO2S is okay. If any of these were not met, go to next step.
3. Loosen and retighten engine ground bolts. (Scheme 10) Check PCM and HO2S wiring harness connector terminals for damage or corrosion. Repair if necessary and perform final check. See FINAL CHECK under SELF-DIAGNOSTIC SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If fault is present, replace suspect front HO2S sensor.

Scheme 14

1. Loosen and retighten suspect front HO2S. Tighten to 30-37 ft. lbs. (40-50 N.m). Start engine and bring to normal operating temperature. Turn ignition off. Disconnect MAF sensor connector. Start engine and run at idle for at least 3 seconds. Turn ignition off. Connect MAF sensor connector. Ensure DTC P0100/0102 is set. Clear DTC from memory. Run engine at idle for 10 minutes. If DTCs P0171/0115 or P0174/0210 are detected, or it is difficult to start engine, see «DTC P0171 OR P0174: FUEL INJECTION SYSTEM (LEAN)»(ref-18056-S21072199882000122900000). If no DTCs are set, and engine starts, go to next step.
2. Check HO2S Heater - Turn ignition off. Leave HO2S disconnected. Measure resistance between outer terminals of HO2S. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Continuity should not be present between middle terminal and either outer HO2S terminal. Replace HO2S if resistance or continuity is not as specified. If resistance and continuity are as specified, go to next step.
3. Check Component - Connect HO2S sensor. Start engine and bring to normal operating temperature. Connect DVOM between PCM terminal No. 128 (PCM ground) and terminal No. 82 (Red wire) for right HO2S, or terminal No. 83 (White wire) for left HO2S. see scheme 2 Hold engine speed at about 2000 RPM. The following conditions should be met: Maximum voltage is greater than.6 volt one time. Minimum voltage is less than.35 volt one time. Voltage does not exceed one volt. Vehicle is operating in closed loop. See FUEL FEEDBACK MONITORING USING MIL under ADDITIONAL SYSTEM FEATURES in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If these conditions were met, HO2S is okay. If any of these were not met, go to next step.
4. Loosen and retighten engine ground bolts. (Scheme 10) Check PCM and HO2S wiring harness connector terminals for damage or corrosion. Repair if necessary and perform final check. See FINAL CHECK under SELF-DIAGNOSTIC SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If fault is present, replace suspect front HO2S sensor.

1. Loosen and retighten suspect front HO2S. Tighten to 30-37 ft. lbs. (40-50 N.m). Start engine and bring to normal operating temperature. Turn ignition off. Disconnect MAF sensor connector. Start engine and run at idle for at least 3 seconds. Turn ignition off. Connect MAF sensor connector. Ensure DTC P0100/0102 is set. Clear DTC from memory. Run engine at idle for 10 minutes. If DTCs P0172/0114 or P0175/0209 are detected, or it is difficult to start engine, see «DTC P0172 OR P0175: FUEL INJECTION SYSTEM (RICH)»(ref-18056-S13409256452000122900000). If no DTCs are set, and engine starts, go to next step.
2. Check HO2S Heater - Turn ignition off. Leave HO2S disconnected. Measure resistance between outer terminals of HO2S. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Continuity should not be present between middle terminal and either outer HO2S terminal. Replace HO2S if resistance or continuity is not as specified. If resistance and continuity are as specified, go to next step.
3. Check Component - Connect HO2S sensor. Start engine and bring to normal operating temperature. Connect DVOM between PCM terminal No. 128 (PCM ground) and terminal No. 82 (Red wire) for right HO2S, or terminal No. 83 (White wire) for left HO2S. see scheme 2 Hold engine speed at about 2000 RPM. The following conditions should be met: Maximum voltage is greater than.6 volt one time. Minimum voltage is less than.35 volt one time. Voltage does not exceed one volt. Vehicle is operating in closed loop. See FUEL FEEDBACK MONITORING USING MIL under ADDITIONAL SYSTEM FEATURES in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If these conditions were met, HO2S is okay. If any of these were not met, go to next step.
4. Loosen and retighten engine ground bolts. (Scheme 10) Check PCM and HO2S wiring harness connector terminals for damage or corrosion. Repair if necessary and perform final check. See FINAL CHECK under SELF-DIAGNOSTIC SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If fault is present, replace suspect front HO2S sensor.

1. Loosen and retighten engine grounds. (Scheme 10) Loosen and retighten suspect front HO2S. Tighten to 30-37 ft. lbs. (40-50 N.m). Check for intake air leak between MAF sensor and intake manifold. Check for exhaust system leak before 3-way catalyst. Repair as necessary. if okay, go to next step.
2. Start engine and bring to normal operating temperature. Turn ignition off. Disconnect MAF sensor connector. Start engine and run at idle for at least 3 seconds. Turn ignition off. Connect MAF sensor connector. Ensure DTC P0100/0102 is set. Clear DTC from memory. Run engine at idle for 10 minutes. If DTCs P0171/0115, P0172/0114, P0174/0210 or P0175/0209 are detected, or it is difficult to start engine, see appropriate diagnostic procedure for DTCs set. If no DTCs are set, and engine starts, go to next step.
3. Check Input Signal Circuit - Turn ignition off. Disconnect front HO2S harness connectors and PCM harness connector. see scheme 2and (Scheme 14). Check that continuity exists as follows: For left HO2S, check between PCM connector terminal No. 83 and HO2S connector terminal No. 2 (White wire). For right HO2S, check between PCM connector terminal No. 82 and HO2S connector terminal No. 2 (Red wire). Check continuity does not exist as follows: For left HO2S, check between ground and PCM connector terminal No. 83 (White wire) and HO2S connector terminal No. 2. For right HO2S, check between ground and PCM connector terminal No. 82 (Red wire) and HO2S connector terminal No. 2. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
4. Check HO2S Heater - Turn ignition off. Leave HO2S disconnected. Measure resistance between outer terminals of HO2S. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Continuity should not be present between middle terminal and either outer HO2S terminal. Replace HO2S if resistance or continuity is not as specified. If resistance and continuity are as specified, go to next step.
5. Check MAF Sensor - See step 6) in «DTC P0100: MASS AIRFLOW (MAF) SENSOR»(ref-18056-S10326529632000122900000). Also, check PCV valve. Replace as necessary. If okay, go to next step.
6. Check Component - Start engine and bring to normal operating temperature. Connect DVOM between PCM terminal No. 128 (PCM ground) and terminal No. 82 (Red wire) for right HO2S, or terminal No. 83 (White wire) for left HO2S. see scheme 2 Hold engine speed at about 2000 RPM. The following conditions should be met: Maximum voltage is greater than.6 volt one time. Minimum voltage is less than.35 volt one time. Voltage does not exceed one volt. Vehicle is operating in closed loop. See FUEL FEEDBACK MONITORING USING MIL under ADDITIONAL SYSTEM FEATURES in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If these conditions were met, HO2S is okay. If any of these were not met, replace suspect front HO2S.

Depending on equipment available, use one of the following to set DTC

1. Using GST, turn ignition on and wait at least 5 seconds then select MODE 3.
2. Using MIL, turn ignition on and wait at least 5 seconds. Turn ignition off and wait at least 5 seconds. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

Condition for setting DTC are

1. Excessively high voltage is sent from sensor to PCM.

1. Loosen and retighten engine grounds. (Scheme 10) Loosen and retighten suspect front HO2S. Tighten to 30-37 ft. lbs. (40-50 N.m).
2. Check Input Signal Circuit Turn ignition off. Disconnect front HO2S harness connectors and PCM harness connector. see scheme 2and (Scheme 14). Check that continuity exists as follows: For left HO2S, check between PCM connector terminal No. 83 and HO2S connector terminal No. 2 (White wire). For right HO2S, check between PCM connector terminal No. 82 and HO2S connector terminal No. 2 (Red wire). Check continuity does not exist as follows: For left HO2S, check between ground and PCM connector terminal No. 83 (White wire) and HO2S connector terminal No. 2. For right HO2S, check between ground and PCM connector terminal No. 82 (Red wire) and HO2S connector terminal No. 2. If continuity is as specified, go to next step. If continuity is not as specified, repair harness or connectors as necessary.
3. Check Component - Connect HO2S. Start engine and bring to normal operating temperature. Connect DVOM between PCM terminal No. 128 (PCM ground) and terminal No. 82 (Red wire) for right HO2S, or terminal No. 83 (White wire) for left HO2S. see scheme 2 Hold engine speed at about 2000 RPM. The following conditions should be met: Maximum voltage is greater than.6 volt one time. Minimum voltage is less than.35 volt one time. Voltage does not exceed one volt. Vehicle is operating in closed loop. See FUEL FEEDBACK MONITORING USING MIL under ADDITIONAL SYSTEM FEATURES in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If these conditions were met, HO2S is okay. If any of these were not met, replace suspect front HO2S.

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle for at least 6 seconds. Select MODE 3.
2. Using MIL, start engine and idle for at least 6 seconds. Turn ignition off and wait at least 5 seconds, then turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

Condition for setting DTC are

1. If current amperage in front HO2S circuit is out of normal range, sending improper voltage drop signal to PCM.

1. Turn ignition off. Disconnect front HO2S harness connector. Turn ignition on. Using DVOM, measure voltage between front HO2S harness connector terminal No. 3 (Red/Black wire) and ground. If reading indicates battery voltage, go to next step. If reading does not indicate battery voltage, check for blown fuse No. 16 (7.5-amp) or fault in Red/Black wire. Repair or replace as required.
2. Check Ground Circuit - Turn ignition off. Disconnect PCM harness connector. For left HO2S, check continuity of Green/White wire between PCM connector terminal No. 17 and left front HO2S terminal No. 1. For right HO2S, check continuity of Blue/Yellow wire between PCM connector terminal No. 16 and front HO2S harness connector terminal No. 1. If no continuity exists, repair fault in appropriate wire. If continuity exists, go to next step.
3. Check Component - Turn ignition off. Leave HO2S disconnected. Measure resistance between outer terminals of HO2S. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Continuity should not be present between middle terminal and either outer HO2S terminal. Replace HO2S if resistance or continuity is not as specified. If resistance and continuity are as specified, go to next step.
4. Loosen and retighten engine grounds. (Scheme 10) Disconnect PCM and HO2S wiring harness connector. Check terminals for damage or corrosion. Repair if necessary and perform final check. See FINAL CHECK under SELF-DIAGNOSTIC SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If fault is still present, replace suspect HO2S sensor.

Scheme 15

1. Turn ignition off. Loosen and retighten engine grounds. (Scheme 10) Start engine and bring to normal operating temperature. Turn ignition off. Disconnect Mass Airflow (MAF) sensor. Start engine and allow to idle for at least 3 seconds. Turn engine off. Connect MAF. Ensure DTC P0100/0102 is set. Erase DTC from memory. Run engine for at least 10 minutes at idle. If DTCs P0171/0115 or P0174/0210 are set, or engine is hard to start, go to appropriate diagnostic test for DTCs set. If DTCs do not set, and engine starts easily, go to next step.
2. Check Input Signal Circuit - Turn ignition off. Disconnect affected rear HO2S connector. Disconnect PCM connectors. Check continuity between PCM connector terminal No. 90 (Yellow wire) and left rear HO2S harness connector White wire terminal, or check continuity between PCM terminal No. 89 (White wire) and right rear HO2S harness White wire terminal. Continuity should exist. Also, ensure continuity to ground does not exist any terminal. If continuity readings are not as specified, repair related faulty circuit. If continuity reading is as specified, go to next step.
3. Check Ground Circuit - Turn ignition off. Loosen and retighten engine grounds. (Scheme 10) Check continuity of HO2S harness connector Black wire and ground. If continuity exists, go to next step. If continuity does not exist, repair wiring as necessary.
4. Check Component - Start engine and bring to normal operating temperature. Connect a DVOM between PCM terminal No. 128 and No. 89 (White wire) for right rear HO2S, or terminal No. 90 (Yellow wire) for left rear HO2S. see scheme 2 Check voltage reading while revving engine up to 4000 RPM under no load at least 10 times. Reading should be greater than.48 volt at least once. If reading is not greater than.48 volt at least once, go to next step.
5. Allow vehicle to idle for 10 minutes and check reading, or test drive vehicle and check reading while coasting from 50 MPH. If reading is less than.43 volt at least once, sensor is okay at this time. If reading is not less than.43 volt at least once, replace suspect rear HO2S.

1. Turn ignition off. Loosen and retighten engine grounds. (Scheme 10) Start engine and bring to normal operating temperature. Turn ignition off. Disconnect Mass Airflow (MAF) sensor. Start engine and allow to idle for at least 3 seconds. Turn engine off. Connect MAF. Ensure DTC P0100/0102 is set. Erase DTC from memory. Run engine for at least 10 minutes at idle. If DTCs P0171/0115 or P0174/0210 are set, or engine is hard to start, go to appropriate test procedure for DTC set. If DTCs do not set, and engine starts easily, go to next step.
2. Check Input Signal Circuit - Turn ignition off. Disconnect affected rear HO2S connector. Disconnect PCM connectors. Check continuity between PCM connector terminal No. 90 (Yellow wire) and left rear HO2S harness connector White wire terminal, or check continuity of White wire between PCM terminal No. 89 and right rear HO2S harness connector. Continuity should exist. Also, ensure continuity to ground does not exist between either PCM connector terminal. If continuity readings are not as specified, repair related faulty circuit. If continuity readings are as specified, go to next step.
3. Check Ground Circuit - Turn ignition off. Loosen and retighten ground bolts. (Scheme 10) Check continuity of HO2S harness connector Black wire and ground. If continuity exists, go to next step. If continuity does not exist, repair wiring as necessary.
4. Check Component - Start engine and bring to normal operating temperature. Connect a DVOM between PCM terminal No. 128 and No. 89 (White wire) for right rear HO2S, or terminal No. 90 (Yellow wire) for left rear HO2S. see scheme 2 Check voltage reading while revving engine up to 4000 RPM under no load. Repeat 10 times. Reading should be greater than.48 volt at least once. If reading is less than.48 volt, go to next step.
5. Allow vehicle to idle for 10 minutes and check reading, or test drive vehicle and check reading while coasting from 50 MPH. If reading is less than.43 volt at least once, sensor is okay at this time. If reading is not less than.43 volt at least once, replace suspect rear HO2S.

1. Turn ignition off. Loosen and retighten engine grounds. (Scheme 10) Turn ignition off. Disconnect affected rear HO2S connector. Disconnect PCM connectors. Check continuity between PCM connector terminal No. 90 (Yellow wire) and left rear HO2S harness connector White wire terminal, or check continuity between PCM terminal No. 89 (White wire) and right rear HO2S harness White wire terminal. Continuity should exist. Also, ensure continuity to ground does not exist between either PCM connector terminal. If continuity readings are not as specified, repair related faulty circuit. If continuity reading is as specified, go to next step.
2. Check Ground Circuit - Turn ignition off. Check continuity of HO2S harness connector Black wire terminal and ground. If continuity exists, go to next step. If continuity does not exist, repair wiring as necessary.
3. Check Component - Start engine and bring to normal operating temperature. Connect a DVOM between PCM terminal No. 128 and No. 89 (White wire) for right rear HO2S, or terminal No. 90 (Yellow wire) for left rear HO2S. see scheme 2 Check voltage reading while revving engine up to 4000 RPM under no load at least 10 times. Reading should be greater than.48 volt at least once. If reading is less than.48 volt, go to next step.
4. Allow vehicle to idle for 10 minutes and check reading, or test drive vehicle and check reading while coasting from 50 MPH. If reading is less than.43 volt at least once, sensor is okay at this time. If reading is not less than.43 volt at least once, replace suspect rear HO2S.

1. Loosen and tighten engine ground connector located behind dipstick. (Scheme 10) Ensure connectors are in good condition and securely fastened.
2. Check Input Signal Circuit - Disconnect rear HO2S and PCM harness connectors. Check continuity exists between PCM terminal No. 90 (Yellow wire) and left HO2S connector White wire terminal, or PCM terminal No. 89 (White wire) and right HO2S connector White wire terminal. Also, check that continuity to ground does not exist at either terminal. If continuity exists between specified terminals and does not exist to ground, go to next step. If continuity is not as specified, repair wiring as necessary.
3. Check Ground Circuit - Check that continuity exists between ground and Brown wire terminal of left rear HO2S connector, Black wire terminal for right rear HO2S connector. If continuity does not exist, repair harness as necessary. If continuity exists, go to next step.
4. Check Component - Connect all HO2S harness connectors. Connect PCM harness connector. Warm engine to normal operating temperature. Connect DVOM between PCM terminal No. 128 and No. 90 (Yellow wire) for left rear HO2S, or terminal No. 89 (White wire) for right rear HO2S. see scheme 2 While observing DVOM, rev engine to 4000 RPM (under no load) and release. Repeat 10 times. If voltage reading is greater than.48 volts at least one time, sensor is okay. If reading does not exceed.48 volts one time, go to next step.
5. Allow vehicle to idle for 10 minutes, then check DVOM reading. If voltage reading is less than.43 volt at least on time, sensor is okay. If voltage reading is not less than.43 volt one time, replace suspect rear HO2S.

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and run it at idle for 6 seconds then select MODE 3.
2. Using MIL, start engine and run it at idle for 6 seconds. Turn ignition off. Wait 5 seconds and turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

Conditions for setting DTC are

1. Current amperage for rear HO2S heater circuit is out of range.

1. Turn ignition off. Disconnect rear HO2S harness connector. (Scheme 15) Turn ignition on. Using a DVOM, measure voltage between rear HO2S harness connector terminal No. 4 (Green/Red wire) and ground. If battery voltage does not exist, check for blown fuse No. 3 (7.5-amp) or fault in Green/Red wire. If battery voltage exists, go to next step.
2. Check Ground Circuit - Turn ignition off. Disconnect PCM harness connector. Using a DVOM, check continuity between left rear HO2S harness connector terminal No. 1 (Blue wire) and PCM connector terminal No. 19, or right rear HO2S terminal No. 1 (Yellow/Red wire) and PCM harness connector terminal No. 18. If continuity does not exist, repair open in appropriate wire. If continuity exists, go to next step.
3. Check Component - Turn ignition off. Leave rear HO2S disconnected. Measure resistance between left rear HO2S sensor Blue wire and Green/Red wire terminals, or right rear HO2S sensor Yellow/Red wire and Green/Red wire terminals. Reading should be 2.3-4.3 ohms at 77°F (25°C). Continuity should not exist between any other rear HO2S sensor terminals. Replace rear HO2S if resistance or continuity is not as specified, replace rear HO2S. If HO2S is okay, go to next step.
4. Loosen and retighten engine ground bolts. (Scheme 10) Check PCM and HO2S wiring harness connector terminals for damage or corrosion. Repair if necessary and perform final check. See FINAL CHECK under SELF-DIAGNOSTIC SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If fault is still present, replace suspect rear HO2S sensor.

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and run to normal operating temperature. Turn ignition off. Wait 5 seconds. Disconnect MAF sensor. Then start engine and run for at least 3 seconds at idle. Turn engine off. Connect MAF sensor. Select MODE 7 and ensure 1st trip DTC P0100 is detected. Select MODE 4 and erase DTC P0100. Start engine and run for at least 10 minutes at idle. Select MODE 7. The 1st trip DTC P0171 or P0174 should be detected if a malfunction exists. If restarting engine was difficult, a problem with fuel injection system exists. Crank engine while depressing accelerator pedal. If engine starts, go to DIAGNOSTIC PROCEDURE. If engine does not start, visually check for exhaust and intake leaks.
2. Using MIL, start engine and run it at idle for 6 seconds. Turn ignition off. Wait 5 seconds. Disconnect MAF sensor. Start engine and run for at least 3 seconds at idle. Turn engine off. Connect MAF sensor. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. MIL DTC 0102 should be detected. Erase MIL DTC 0102 by switching to MODE I on PCM. Select MODE II on PCM. Ensure MIL DTC 0505 is present. Start engine and run for at least 10 minutes at idle. MIL DTC 0115 or 0210 should be detected if a malfunction exists. If restarting engine was difficult, a problem with fuel injection system exists. Crank engine while depressing accelerator pedal. If engine starts, go to DIAGNOSTIC PROCEDURE. If engine does not start, visually check for exhaust and intake leaks.

Conditions for setting DTC are

1. Fuel injection system does not operate properly.
2. Amount of mixture ratio compensation is too great (mixture ratio is too lean).

1. Turn ignition off. Ensure an exhaust air leak is not present before 3-way catalytic converter. Check for any vacuum leaks at intake manifold, fuel injectors and/or between MAF sensor and throttle body. Check for lack of fuel, incorrect fuel pressure, poor fuel quality or an exhaust leak. Repair as necessary. If okay, go to next step.
2. Check Front Heated HO2S - Turn ignition off. Disconnect front HO2S and PCM harness connectors. (Scheme 16) Check continuity between PCM connector terminal No. 83 and left HO2S connector terminal No. 2 (White wire). Check continuity between PCM connector terminal No. 82 and right HO2S connector terminal No. 2 (Red wire). If continuity exists, go to next step. If continuity does not exist, repair appropriate wire.
3. Check continuity between ground and PCM connector terminals No. 82 and 83. If continuity exists, repair short to ground in appropriate wire. If continuity does not exist, go to next step.
4. Check Fuel Pressure - See FUEL PRESSURE under FUEL SYSTEM in «BASIC TESTING»(ref-18054) article. If fuel pressure is correct, go to next step. If fuel pressure is not correct, repair fuel delivery system as necessary.
5. Check Mass Airflow (MAF) Sensor - Connect all previously disconnected components. Ensure engine is at normal operating temperature. Using a DVOM, backprobe PCM between terminals No. 65 and 128. With ignition on and engine off, reading should be less than one volt. With engine idling under no load, reading should about 1.0-1.7 volts. At 2500 RPM, reading should be about 2.1 volts. Replace MAF if readings are not as specified. If MAF is okay, go to next step.
6. Check Function Of Fuel Injectors - Connect any previously disconnected components. Start engine. Listen to each injector for an operating sound (clicking noise should be heard). If all injectors are making an operating sound, go to next step. If an operating sound is not heard from one (or more) injector, connect a noid light to injector(s) harness connector and verify signal to injector. If signal is received, go to next step. If signal is not received, repair wiring to injector. CAUTION: Use extreme caution to avoid fire during the following procedure.
7. Test Fuel Delivery - Remove injector rail assembly, leaving fuel lines and injectors connected. Place reservoir under each injector. Disable electrical portion of ignition system. Crank engine for about 3 seconds. Replace injectors that do not spray fuel evenly or do not deliver fuel.

Note. Always use NEW "O" rings when installing fuel injectors.

Scheme 16

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and run it to normal operating temperature. Turn ignition off. Wait 5 seconds. Disconnect MAF sensor. Start engine and run for at least 3 seconds at idle. Turn engine off. Connect MAF sensor. Select MODE 7 and ensure 1st trip DTC P0100 is detected. Select MODE 4 and erase DTC P0100. Start engine and run for at least 10 minutes at idle. Select MODE 7. The 1st trip DTC P0172 or P0175 should be detected if a malfunction exists. If restarting engine was difficult, a problem with fuel injection system exists. Crank engine while depressing accelerator pedal. If engine starts, go to DIAGNOSTIC PROCEDURE. If engine does not start, visually check spark plugs for fouling.
2. Using MIL, start engine and run it at idle for 6 seconds. Turn ignition off. Wait 5 seconds. Disconnect MAF sensor. Then start engine and run for at least 3 seconds at idle. Turn engine off. Connect MAF sensor. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article. MIL DTC 0102 should be detected. Erase MIL DTC 0102 by switching to MODE I on PCM. Select MODE II on PCM. Ensure MIL DTC 0505 is present. Start engine and run for at least 10 minutes at idle. MIL DTC 0114 or 0209 should be detected, if a malfunction exists. If restarting engine was difficult, a problem with fuel injection system exists. Crank engine while depressing accelerator pedal. If engine starts, go to DIAGNOSTIC PROCEDURE. If engine does not start, visually check spark plugs for fouling.

Conditions for setting DTC are

1. Fuel injection system does not operate properly.
2. Amount of mixture ratio compensation is too great (mixture ratio is too rich).

1. This DTC identifies a rich fuel condition resulting in adaptive fuel strategy adjusting fuel system to compensate. Possible causes for this fault are: Faulty front HO2S. Faulty injector(s). Exhaust gas leak. Incorrect fuel pressure. Faulty MAF sensor or connector.
2. Check For Exhaust Leaks - Start engine and run at idle. Check for an exhaust leak before 3-way catalytic converter. Also, check for a restricted exhaust system. Repair as necessary. If no leak is found, go to next step.
3. Check Front HO2S - Turn ignition off. Disconnect front HO2S connector. Disconnect PCM connector. For DTC P0172, check continuity between PCM connector terminal No. 83 (White wire) and left HO2S White wire terminal. For DTC P0175, check continuity between PCM connector terminal No. 82 (Red wire) and right HO2S Red wire terminal. If continuity exists, go to next step. If continuity does not exist, repair appropriate wire.
4. Check continuity between ground and PCM connector terminals No. 82 and 83. If continuity exists, repair short to ground in appropriate wire. If continuity does not exist, go to next step.
5. Check Fuel Pressure - See FUEL PRESSURE in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If fuel pressure is correct, go to next step. If fuel pressure is not correct, repair fuel delivery system as necessary.
6. Check Mass Air Flow (MAF) Sensor - Connect all previously disconnected components. Ensure engine is at normal operating temperature. Using a DVOM, backprobe PCM between terminals No. 5 and 128. With ignition on and engine off, reading should be less than one volt. With engine idling under no load, reading should about 1.0-1.7 volts. At 2500 RPM, reading should be about 2.1 volts. Replace MAF if readings are not as specified. If MAF is okay, go to next step.
7. Check Function Of Fuel Injectors - Connect any previously disconnected components. Start engine. Listen to each injector for an operating sound (clicking noise should be heard). If all injectors are making an operating sound, go to next step. If an operating sound is not heard from one (or more) injector, connect a noid light to injector harness and verify signal to injector. If signal is received, go to next step. If signal is not received, repair wiring to injector. CAUTION: Use extreme caution to avoid fire during the following procedure.
8. Test Fuel Delivery - Remove injector rail, leaving fuel lines and injectors connected. Place reservoir under each injector. Disable electrical portion of ignition system. Crank engine for about 3 seconds. Replace injectors that do not spray or deliver fuel, or any leaking injectors.

Note. Always use NEW "O" rings when installing fuel injectors.

Depending on equipment available, use one of the following to set DTC

1. Using GST, Turn ignition on. Wait at least 10 seconds. Select MODE 7. If DTC P0180 is set, go to DIAGNOSTIC PROCEDURES. If DTC does not set, select MODE 1 and check Engine Coolant Temperature (ECT) reading. Allow engine to cool until ECT reading is significantly less than 194°F (90°C). Select MODE 7. If DTC P0180 is set, go to DIAGNOSTIC PROCEDURES.
2. Using MIL, turn ignition on. Wait at least 10 seconds. Turn ignition off. Wait at least 5 seconds and turn ignition on. Perform test MODE II. MIL DTC 0402 should be set. See SELF- DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If MIL DTC 0402 is not set at this time, allow engine to cool. Connect DVOM between PCM terminals No. 67 and ground. Wait until voltage is greater than one volt. Turn ignition off. Wait 5 at least seconds and then turn ignition on. Perform test MODE II. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If MIL DTC 0402 is set, go to step 1).

1. Check Power Supply - Turn ignition off. Disconnect TFT sensor harness connector located above fuel tank. Turn ignition on. Using a DVOM, measure voltage between TFT harness connector Red/Blue wire terminal and ground. If reading is about 5 volts, go to next step. If reading is not about 5 volts, repair fault in Red/Blue wire.
2. Check Ground Circuit - Check continuity between TFT harness connector Black wire terminal and ground. If continuity exists, go to next step. If no continuity exists, repair fault in Black wire.
3. Check Component - Remove TFT sensor. With TFT sensor at specified temperatures, measure resistance between TFT harness connector Red/Blue wire and Black wire terminals. See «TANK FUEL TEMPERATURE (TFT) SENSOR RESISTANCE»(ref-18056-S38872591392000122900000) table. If resistance is not as specified, replace sensor. If resistance is as specified, check PCM connector for damage or corrosion. Reconnect harness connectors in circuit and perform final check. See FINAL CHECK under SELF-DIAGNOSTIC SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

TANK FUEL TEMPERATURE (TFT) SENSOR RESISTANCE

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and bring to normal operating temperature. Turn ignition off. Wait at least 5 seconds. Start engine. Hold the accelerator pedal steady, while driving at 1500-3000 RPM for at least 3 minutes. Select MODE 3.
2. Using MIL, start engine and bring to normal operating temperature. Turn ignition off. Wait at least 5 seconds. Start engine. Hold the accelerator pedal as steady as possible and drive at 1500-3000 RPM for at least 3 minutes. Turn ignition off, wait 5 seconds and turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

Conditions for setting DTCs are

1. Misfire detected in one or more cylinders.
2. DTC is detected in 2 consecutive trips.
3. Misfire detected may damage or overheat 3-way catalyst.

1. Check for vacuum leaks. Check for correct fuel pressure and ignition timing. Check exhaust system for restrictions. Check EGR system for correct operation. Repair if necessary. If no faults are found, go to next step.
2. Check Fuel System - Start engine and allow to idle. Listen to each injector to verify operational sound (clicking noise). Individually, disconnect each fuel injector wiring harness connector. If engine speed momentarily drops, reconnect and go to next injector. If engine speed drops for each injector, go to step 5). If engine speed does not momentarily drop, go to next step.
3. Check Ignition System - Check ignition system for defective or misrouted wiring. Check for proper spark. Check spark plugs for correct application, gap, wear or fouling. Check ignition coil, power resistor and related circuits. See «I - SYSTEM & COMPONENT TESTING»(ref-18057) article. If spark is okay, go to next step.
4. Perform Compression Test - See «SPECIFICATIONS»(ref-18051) article. If compression is okay, go to next step.
5. Check Fuel Pressure - See FUEL PRESSURE under FUEL SYSTEM in «BASIC TESTING»(ref-18054) article. If fuel pressure is correct, go to next step. If fuel pressure is correct, repair fuel delivery system as necessary.
6. Check Mass Airflow (MAF) Sensor - Using a DVOM, backprobe PCM between terminals No. 65 and 128. With ignition on and engine off, reading should be less than one volt. With engine idling under no load, reading should about 1.0-1.7 volts. At 2500 RPM, reading should be about 2.1 volts. Replace MAF if reading are not as specified. If MAF is okay, go to next step.
7. Check PCM - Turn ignition off. Disconnect PCM wiring harness connector. Inspect pins for damage or corrosion and repair as necessary. Connect PCM and retest vehicle. If fault is still present, install a known-good PCM and retest vehicle. If fault is still present, verify DTC is still present. If DTC is still present, repeat step 1).

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect PCM harness connector and knock sensor sub-harness connector. see scheme 2and (Scheme 17). Verify harness continuity between knock sensor connector terminal No. 2 (left bank) and PCM terminal No. 105, or verify harness continuity between knock sensor connector terminal No. 4 (right bank) and PCM terminal No. 108. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
2. Leave ignition off. Verify continuity between engine ground and knock sensor connector terminals No. 2 and 4 (White wire). If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
3. Check Component - With ambient temperature about 77°F (25°C), measure resistance between KS sensor terminal No. 2 and ground. (Scheme 18) Resistance should be 500-620 k/ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace KS sensor.
4. Disconnect PCM wiring harness connector. Check connector pins for damage or corrosion. Check all circuit connectors for clean, tight fit. Service if necessary. Loosen and retighten engine ground bolts. (Scheme 10) If fault is still present, replace KS sensor.

Scheme 17

Scheme 18

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect PCM wiring harness connector. Disconnect CKP wiring harness connector. (Scheme 19) Check for continuity between CKP sensor connector terminal No. 1 (Green wire) and PCM connector terminal No. 57 (Black/Red wire). If continuity is present, go to next step. If continuity is not as present, repair harness or connectors as necessary.
2. Check Ground Circuit - Turn ignition off. Loosen, and retighten engine ground bolts. Check for continuity between CKP sensor connector terminal No. 2 (Red wire) and engine ground. If continuity is present, go to next step. If continuity is not present, repair harness or connectors between CKP sensor and PCM, throttle actuator control module or Transmission Control Module (TCM).
3. Check Component - Disconnect and remove CKP sensor. Loosen sensor fixing bolt. With ambient temperature about 77°F (25°C), measure resistance between CKP sensor terminals. Resistance should be 166-204 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace CKP sensor.
4. Disconnect PCM wiring harness connector. Check connector pins for damage or corrosion. Check all circuit connectors for clean, tight fit and service if necessary. If fault is still present, replace CKP sensor.

Scheme 19

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on.Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect CMP sensor harness connector. (Scheme 20) Turn ignition on. Measure voltage between CMP sensor harness connector terminal No. 2 (Red/Green wire) and ground. (Scheme 21) If battery voltage is present, go to next step. If battery voltage is not present, verify continuity of Red/Green wire between CMP sensor and PCM, and between CMP sensor and ECCS relay. Repair harness or connectors as necessary.
2. Check Input Signal Circuit - Turn ignition off. Disconnect PCM harness connector. Check for continuity as follows: Between CMP sensor harness connector terminal No. 3 (Blue wire) and PCM terminal No. 59. Between CMP sensor harness connector terminal No. 4 (Pink wire) and PCM harness connector terminals No. 55 and 58. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
3. Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Verify harness continuity between CMP sensor connector terminal No. 1 (Black wire) and engine ground. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
4. Check Component - Inspect CMP sensor signal plate for damage or contamination. Check CMP and PCM harness connectors for damage, corrosion or pushed-out pins. Repair if necessary. If no problems are found, go to next step.
5. Reconnect all components. Start engine and allow to idle. Set DVOM to DC voltage scale. Measure voltage between ground and PCM connector terminal No. 59. Reading should indicate approximately 2.5 volts (average voltage). Measure voltage between ground and PCM connector terminals No. 55, 58 and 128. Reading should indicate 0.7-1.2 volts (average voltage). If voltage is as specified, go to next step. If voltage is not as specified, replace CMP sensor.
6. Increase engine speed to 2000 RPM. Measure voltage between ground and PCM connector terminal No. 59. Reading should indicate approximately 2.5 volts (average voltage). Measure voltage between ground and PCM connector terminals No. 55, 58 and 128. Reading should indicate 0.7-1.2 volts (average voltage). If voltage is as specified, go to next step. If voltage is not as specified, replace CMP sensor.

Scheme 20

Scheme 21

1. Raise and support front drive wheels. Start engine and bring to normal operating temperature. Turn TCS switch off, if equipped. Place shifter to "1" position. Increase engine speed to 3000 RPM. Disconnect and connect solenoid valve harness connector and verify solenoid valve makes operating sound. Ignore DTCs set for EGRC solenoid or EGR valve.
2. Check Vacuum Supply Hose - Ensure vacuum supply hose for clogging, cracks, misrouted or disconnected. Repair as necessary. If okay, go to next step.
3. Check EGRC Solenoid Valve - Remove EGRC solenoid valve. Using jumper wires, apply voltage across EGRC solenoid valve terminals. (Scheme 22) Check that air passes between ports "A" and "B", and air does not pass between ports "A" and "C". Remove jumper wires and check that air does not pass between ports "A" and "B", and passes between ports "A" and "C". If EGRC solenoid valve operates as specified, go to next step. Replace if faulty.
4. Check Components - Turn ignition off. Start engine and increase engine speed to 2000-4000 RPM. Disconnect and connect solenoid valve harness connector and verify solenoid valve makes operating sound. Ignore DTCs set for EGRC solenoid or EGR valve. Check EGR valve and EVAP canister purge control solenoid valve. See «I - SYSTEM & COMPONENT TESTS»(ref-18057) article. Replace as necessary, If okay, go to next step.
5. Check vacuum hose to EVAP canister for clogging, cracks or being misrouted or disconnected. Repair as necessary. Check EGRC-BPT. See «DTC P0402: EGR CONTROL BACKPRESSURE TRANSDUCER»(ref-18056-S08366266072000122900000) (EGRC-BPT) VALVE. Replace if faulty. If okay, go to next step.
6. Check EGR Temperature Sensor - Measure resistance of EGR temperature sensor. See «EGR TEMPERATURE SENSOR SPECIFICATIONS»(ref-18056-S11645702062000122900000) table. If EGR temperature sensor is okay, disconnect harness connectors in circuit and check for damage or corrosion.

EGR TEMPERATURE SENSOR SPECIFICATIONS

Scheme 22

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

Perform system readiness test-drive. See SYSTEM READINESS TEST (SRT) under ADDITIONAL SYSTEM FEATURES in TESTS W/CODES - INTRODUCTION article. If DTC will reset, go to DIAGNOSTIC PROCEDURE.

1. Verify fuel filler cap closes properly and does not contain any foreign matter. Verify fuel filler cap is original equipment. Check fuel filler cap vacuum relief valve (inside cap). Wipe valve housing clean. Apply vacuum through cap. There should be a slight resistance, accompanied by valve clicks, indicating valve is okay. Blow air on fuel tank side. Air should pass freely through valve. If valve is clogged or no resistance is felt, replace cap assembly. If cap tests okay, go to next step.
2. Check for EVAP System Leak - Turn ignition off. Disconnect and apply 12 volts across EVAP canister vent control valve terminals. Disconnect and apply 12 volts across vacuum cut valve by-pass valve terminals. Using vacuum/pressure gauge connected to EVAP service port, apply.4-.8 in. Hg of pressure. Using leak detector, check for leakage in EVAP circuit. Repair as necessary. If no leak is present, go to next step.
3. Check EVAP Canister Purge Volume Control Valve - Disconnect EVAP canister purge volume control valve harness connector. Using a DVOM, measure resistance between EVAP canister purge volume control valve terminals No. 2 and 1, and No. 2 and 3. Also, measure resistance between No. 5 and 4, and No. 5 and 6. (Scheme 23) Resistance should be 35-43 ohms. If resistance is not as specified, replace solenoid. If resistance is as specified, go to next step.
4. Check EVAP Canister Purge Control Valve - Apply low air pressure to ports "A", "B" and "C" of EVAP canister purge control valve. (Scheme 24) Ensure air does not leak. Apply about 4-6 in. Hg vacuum to port "A". Air should now pass through from port "C" to "B". Replace EVAP canister purge control valve does not operate as specified. If okay, go to next step.
5. Check EVAP Canister Vent Control Valve - Disconnect EVAP canister vent control valve harness connector. Connect fused battery voltage to EVAP canister vent control valve terminal No. 1 and ground terminal No. 2. (Scheme 25) Verify no air passes from port "A" to "B". Disconnect battery, verify air passes from "A" to "B". If airflow is not as specified, replace control valve. If airflow is as specified, go to next step.
6. Check EVAP Canister Saturation - Remove EVAP canister with vent control valve attached. Ensure excessive moisture or water has not accumulated in the EVAP canister. Weigh EVAP canister assembly. If canister weighs more than 4 lbs. (1.8 kg), replace saturated canister. If canister weighs less than 4 lbs. (1.8 kg), check for an intermittent malfunction.
7. Check EVAP Canister Purge Control Solenoid - Ensure engine is warmed to operating temperature. Turn ignition off. Raise and support drive wheels. Disconnect EVAP canister purge control solenoid vacuum hose. Start engine and increase engine speed to 2000 RPM. If vacuum is present at vacuum hose, go to next step. If vacuum is not present, go to step 10).
8. Apply battery voltage and ground across terminals No. 1 and 2. see scheme 22 With battery voltage applied, air should pass between ports "A" and "B". With voltage removed, air should not pass between ports "A" and "B". Replace EVAP canister purge control solenoid if airflow is not as specified. If solenoid valve is okay, check vacuum hoses for restrictions or misrouted.
9. Check Components - Check AP sensor. See «DTC P0105: ABSOLUTE PRESSURE (AP) SENSOR»(ref-18056-S23997121892000122900000). If sensor tests okay, check MAP/BARO solenoid. See DTC P1105: MANIFOLD ABSOLUTE PRESSURE (MAP)/BAROMETRIC PRESSURE (BARO) SOLENOID. If solenoid tests okay, check TFT sensor. See «DTC P0180: TANK FUEL TEMPERATURE (TFT) SENSOR»(ref-18056-S12963853272000122900000). If sensor tests okay, check EVAP pressure sensor. See «DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR»(ref-18056-S35000534052000122900000). If okay, go to next step.
10. Check EVAP Purge Line - Check EVAP purge line for cracks. Inspect EVAP system components for damage or poor connections. Disconnect and reconnect harness connectors in circuit. Check PCM connector for damage or corrosion and perform final check. See FINAL CHECK under SELF-DIAGNOSTIC SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

Scheme 23

Scheme 24

Scheme 25

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

Scheme 26

Scheme 27

1. Turn ignition off. Disconnect EVAP canister purge volume control valve harness connector. Turn ignition on. Measure voltage between ground and harness connector terminals No. 2 (Red/Green wire) and No. 5 (Red/Green wire). (Scheme 26) If battery voltage is present, go to next step. If battery voltage is not present, repair harness or connectors between canister purge volume control valve and PCM.
2. Check Output Signal Circuit - Turn ignition off. Disconnect PCM harness connector. Check harness continuity between specified EVAP canister purge volume control valve connector terminals and PCM connector terminals. See «OUTPUT CIRCUIT CONTINUITY CHECK»(ref-18056-S32766021182000122900000) table. (Scheme 27) If continuity is present, go to next step. If continuity is not present, repair wiring harness as necessary. OUTPUT CIRCUIT CONTINUITY CHECK PCM Connector Pin No. (1) EVAP-CPVCV Pin No. (Wire Color) 28 1 (Brown/Yellow) 29 4 (Green) 35 3 (Green/Orange) 36 6 (Blue/Black) (1) EVAP Canister Purge Volume Control Valve
3. Check Component - Disconnect EVAP canister purge volume control valve harness connector. Using DVOM, check continuity between specified EVAP canister purge volume control valve terminals. (Scheme 23) If reading is about 35-43 ohms, go to next step. If reading is not about 35-43 ohms, replace EVAP canister purge volume control valve.
4. Remove valve from intake manifold. Connect EVAP canister purge volume control valve harness connector. Disconnect and plug hoses from valve. While observing shaft inside valve, turn ignition on and off. If shaft moves smoothly forward and backward, valve is okay. If shaft does not move forward and backward, replace EVAP canister purge volume control valve.

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect EVAP canister vent control valve harness connector. Turn ignition on. Using a DVOM, measure voltage between EVAP canister vent control valve harness connector Green/Yellow wire terminal and ground. If battery voltage does not exist, check for blown No. 2 (10-amp) fuse or fault in Green/Yellow wire. Repair or replace as required. If battery voltage exists, go to next step.
2. Check Output Signal Circuit - Turn ignition off. Disconnect PCM harness connector. Check continuity of Pink/Black wire between EVAP canister vent control valve harness connector and PCM harness connector terminal No. 20. see scheme 2 If continuity does not exist, repair open in Pink/Black wire. If continuity exists, go to next step.
3. Check Component - Remove and inspect EVAP canister vent control valve for obstructions. Clear or clean as required. Check "O" ring for proper sealing. Using fused jumper wires, apply battery voltage to terminal No. 1 and ground to terminal No. 2. (Scheme 25) If air passes through valve, go to next step. Replace valve if does not pass through valve.
4. Remove jumper wires from valve. If air does not pass through, valve is okay. If air passes through, replace valve. Ensure NEW "O" ring is installed properly. (Scheme 25)

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and bring to normal operating temperature. Using a DVOM, backprobe between ground and PCM connector terminal No. 92. Reading should be less than 4.2 volts. Turn ignition switch off. Wait at least 5 seconds. Start engine and wait at least 20 seconds. Select MODE 7.
2. Using MIL, start engine and bring to normal operating temperature. Using a DVOM, backprobe between ground and PCM connector terminal No. 92. Reading should be less than 4.2 volts. Turn ignition switch off. Wait at least 5 seconds, then turn ignition on. Retrieve DTCs using MIL. See SELF- DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Inspect vacuum hose for bends, kinks, clogging and ensure hoses are properly routed and securely connected. Loosen and retighten engine ground bolts. (Scheme 10) Disconnect and inspect EVAP control system pressure sensor harness connector. If poor connection or water is present, repair or replace as necessary. If okay, go to next step.
2. Check Power Supply - Turn ignition off. Disconnect EVAP control system pressure sensor harness connector. (Scheme 28) Turn ignition on. Using DVOM, measure voltage between EVAP control system pressure sensor harness connector Brown/White wire terminal and ground. If reading is about 5 volts, go to next step. If reading is not about 5 volts, check for faulty connections or fault in Brown/White wire. Repair or replace as required.
3. Check Ground Circuit - Turn ignition off. Disconnect EVAP control system pressure sensor harness connector. Using a DVOM, check continuity between EVAP control system pressure sensor harness connector Black wire terminal and engine ground. If continuity does not exist, repair open in Black wire. If continuity exists, go to next step.
4. Check Input Signal Circuit - Disconnect PCM harness connector. Using DVOM, check continuity of White/Red wire between PCM terminal No. 92 and EVAP control system pressure sensor harness connector terminal No. 2. If continuity does not exist, repair open in White/Red wire. If continuity exists, go to next step.
5. Check EVAP Canister Purge Volume Control Valve - See step 3) in «DTC P0443: EVAP CANISTER PURGE VOLUME CONTROL VALVE»(ref-18056-S12962100622000122900000). Replace as necessary. If okay, go to next step.
6. Check EVAP Canister Vent Control Valve - Remove and inspect EVAP canister vent control valve for obstructions. Clear or clean as required. Check "O" ring for proper sealing. Using fused jumper wires, apply battery voltage to terminal No. 1 and ground to terminal No. 2. (Scheme 28) If air passes through valve, go to next step. Replace valve if air does not pass through valve.
7. Remove jumper wires from valve. If air does not pass through valve, valve is okay. Replace valve if air passes through valve. Ensure NEW "O" ring is installed properly. (Scheme 28)
8. Check Pressure Sensor - Remove EVAP control system pressure sensor with harness connected. Remove hose from EVAP control system pressure sensor. Connect a DVOM between PCM harness terminals No. 92 and 128. Turn ignition on. With no pressure present, reading should indicate 3.0-3.6 volts. Using hand-held vacuum pump apply -2.75 in. Hg of pressure, reading should indicate.4-.6 volt. If reading is not as specified, replace EVAP control system pressure sensor. If reading is as specified, go to next step.
9. Check EVAP Purge Line - Check EVAP purge line for cracks. Inspect EVAP system components for damage or poor connections. Disconnect and reconnect harness connectors in circuit. Check PCM connector for damage or corrosion and perform final check. See FINAL CHECK in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.
10. Check Canister - Remove EVAP canister. Check if water will drain from EVAP canister. Weigh EVAP canister with vent control valve attached. Replace if EVAP canister weighs more than 4 lbs. (1.8 Kg). If EVAP canister weighs less than 4 lbs. (1.8 Kg), inspection is complete.

Scheme 28

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and allow engine to idle. Increase engine speed to about 2500 for 3 seconds and then allow to idle 3 seconds. Repeat. Select MODE 7. If DTC does not set, turn ignition off for at least 5 seconds. Ensure battery voltage is greater than 11 volts. Start engine run for at least one minute at idle. Select MODE 7.
2. Using MIL, start engine and allow to idle. Increase engine speed to about 2500 for 3 seconds, allow to idle 3 seconds. Repeat. Turn ignition off for at least 5 seconds. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article. If DTC does not set, turn ignition off for at least 5 seconds. Ensure battery voltage is greater than 11 volts. Turn ignition off for at least 5 seconds. Start engine run for at least one minute at idle. Retrieve DTCs.

1. Turn ignition off. Disconnect IAC valve harness connector. (Scheme 29) Measure voltage between ground and harness connector terminals No. 2 and 5. see scheme 28 If battery voltage is present, go to next step. If battery voltage is not present, check 7.5-amp fuse No. 57. If fuse is okay, repair Red/Green wire between IAC valve and fuse panel.
2. Check Output Signal Circuit - Turn ignition off. Disconnect PCM harness connector. Check continuity of harness between the following connector terminals: PCM No. 13 and IAC valve No. 1 (Yellow wire). PCM No. 8 and IAC valve No. 4 (Gray/Blue wire). PCM No. 11 and IAC valve No. 3 (Purple wire). PCM No. 12 and IAC valve No. 6 (Gray/Yellow wire). If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
3. Check Component - Disconnect IAC valve wiring harness connector. Measure resistance between IAC valve terminal No. 2 and terminals No. 1 and 3. Also, between IAC valve terminal No. 5 and terminals No. 4 and 6. (Scheme 30) If resistance is about 30 ohms at 68°F (20°C), go to next step. If resistance is not about 30 ohms, replace IAC valve.
4. Remove IAC valve. Reconnect IAC valve harness connector. Turn ignition on and then off. Replace IAC valve if shaft does not move forward and then backward. If shaft moves as specified, check PCM connector terminals for corrosion or damage. Repair as necessary and perform final check. See FINAL CHECK under SELF-DIAGNOSTIC SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

Scheme 29

Scheme 30

1. Turn ignition off. Disconnect Throttle Position (TP) switch. Turn ignition on. Measure voltage between ground and connector Green/Black wire terminal. If battery voltage is present, go to next step. If battery voltage is not present, check fuse No. 18 (10-amp). If fuse is okay, repair Green/Black wire between TP sensor and fuse No. 18 (10-amp).
2. Check Input Signal Circuit - Turn ignition off. Disconnect PCM harness connector. Verify harness continuity between PCM terminal No. 74 (Gray/Blue wire) and TP sensor connector. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
3. Check Component - Ensure engine is at normal operating temperature. Turn ignition off. Disconnect TP switch harness connector. Check for continuity between TP sensor terminals No. 6 (Gray/Blue wire) and No. 8 (Green/Black wire). (Scheme 31) With throttle closed, continuity should exist. With throttle partially open to wide open throttle, continuity should not exist. If continuity is not as specified, replace TP switch.

Scheme 31

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle for at least 2 seconds (P0600), or idle for 40 seconds (P1605). Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/O CODES»(ref-18053) article.

1. Turn ignition off. Disconnect PCM and Transmission Control Module (TCM) harness connectors. (Scheme 32) Check continuity between PCM connector terminal No. 99 and TCM connector terminal No 47. see scheme 2and (Scheme 33). If continuity is present, go to next step. If continuity is not present, repair harness or connectors between PCM and TCM as necessary.
2. Check PCM and TCM wiring harness connector pins for damage or corrosion. Check all circuit connectors for clean, tight fit. If fault is still present, repeat step 1) or substitute a known-good TCM and retest.

Scheme 32

Scheme 33

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect inhibitor switch wiring harness connector. (Scheme 34) Turn ignition on. Measure voltage between inhibitor switch connector terminal No. 3 (Green/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair harness or connectors as necessary.
2. Check Output Signal Circuit - Turn ignition off. Disconnect park/neutral position relay harness connector. (Scheme 35) Check continuity between park/neutral position relay harness connector terminal No. 1 (Red/Green wire) and inhibitor switch connector terminals No. 7 and 9. (Scheme 36) If continuity is present, go to next step. If continuity is not present, repair harness or connectors between PCM and relay.
3. Leave ignition off. Disconnect PCM wiring harness connector. Check continuity between park/neutral position relay connector terminal No. 6 (Yellow/Purple wire) and PCM connector terminal No. 22. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
4. Check Ground Circuit - Leave ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Check continuity between engine ground and park/neutral position relay harness connector terminals No. 2 and 7 (Black wire). If continuity is present, go to next step. If continuity is not present, repair harness or connectors between PCM and relay.
5. Check Park/Neutral Relay - Remove park/neutral relay. Check for continuity between relay terminals No. 6 and 7. (Scheme 37) Continuity should not be present. Apply battery voltage between relay terminals. Continuity should now exist between terminals No. 6 and 7. If readings are not as specified, replace relay, If okay, go to next step.
6. Check Inhibitor Switch - Ensure inhibitor switch is not damaged or contaminated. Check inhibitor switch and PCM harness connectors for damage, corrosion or pushed-out pins. Repair if necessary. If no problems are found, turn ignition on. Using a DVOM, check for battery voltage at specified TCM harness connector terminals in specified shifter position. See «INHIBITOR SWITCH TESTING»(ref-18056-S02234730482000122900000) table. (Scheme 33) If reading is not as specified, replace inhibitor switch. If voltage is as specified, check PCM pins and terminals for damage and check connection of PCM harness connector. Reconnect PCM harness connector and retest.

INHIBITOR SWITCH TESTING

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Start engine and bring to normal operating temperature. Turn ignition off. Disconnect vacuum hose from MAP/BARO solenoid and install a vacuum gauge. Turn ignition on. Check vacuum gauge reading within 5 seconds. Vacuum should not exist. Start engine and allow to idle. If vacuum gauge reading indicates vacuum, go to next step. If vacuum is not present, check vacuum hoses for damage or poor connection. If hoses are okay, check fuel intake system for vacuum leaks. Repair or replace as necessary.
2. Check Power Supply - Turn ignition off. Disconnect MAP/BARO switch solenoid valve harness connector. Turn ignition on. Using DVOM, measure voltage between Black wire terminal and ground. If battery voltage is present, go to next step. If battery voltage is not present, check fuse No. 2 (10-amp). If fuse is okay, repair harness between MAP/BARO solenoid and fuse panel. See WIRING DIAGRAMS.
3. Check Output Signal Circuit - Turn ignition off. Disconnect PCM harness connector. Check continuity of White wire between PCM terminal No. 41 and MAP/BARO solenoid connector. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
4. Check Components - Check AP sensor. See «DTC P0105: ABSOLUTE PRESSURE (AP) SENSOR»(ref-18056-S23997121892000122900000). Replace if faulty. If sensor tests okay, go to next step.
5. Check Component - Remove MAP/BARO solenoid. Apply fused battery voltage between terminals No. 1 and 2. Air should pass between ports "A" and "B" and air should not pass between ports "A" and "C". see scheme 22 With battery voltage removed, air should pass between ports "A" and "C". Air should not pass between ports "A" and "B". Replace MAP/BARO switch solenoid valve if not as specified. If MAP/BARO switch solenoid valve is okay, check an intermittent condition. See «TESTS W/O CODES»(ref-18053) article.

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and warm to normal operating temperature. Turn ignition off. Wait 5 seconds. Restart engine and wait 30 seconds. Turn TCS switch off. Place selector lever in "2" position. Gradually increase engine speed to 1000-1500 RPM for at least 12 seconds. Quickly, increase engine speed to 2500 RPM for 6 seconds. Selector MODE 7.
2. Using MIL, start engine and warm to normal operating temperature. Turn ignition off. Wait 5 seconds. Restart engine and wait 30 seconds. Turn TCS switch off. Place selector lever in "D" position. Gradually increase engine speed to 1000-1500 RPM for at least 12 seconds. Quickly, increase engine speed to 2500 RPM for 6 seconds. Turn ignition switch off. Wait 5 seconds and turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect IVTC solenoid harness connector. (Scheme 38)or (Scheme 39). Turn ignition on. Using a DVOM, measure voltage between IVTC solenoid harness connector terminal No. 1 (Green/Yellow wire) and ground. If battery voltage does not exist, check for blown fuse No. 2 (10-amp) or fault in Green/Yellow wire. Repair or replace if necessary. If battery voltage exists, go to next step.
2. Check Output Signal Circuit - Turn ignition off. Disconnect PCM harness connector. Check continuity between IVTC solenoid harness connector terminal No. 2 (Brown wire) for left bank, or Brown/Yellow wire for right bank, and PCM harness connector terminal No. 24. see scheme 2 If no continuity exists, repair fault in harness. If continuity exists, go to next step.
3. Check Component - Remove IVTC solenoid. Using fused jumper wires, apply battery voltage to IVTC solenoid terminals. Ensure solenoid plunger operates. If plunger does not operate, replace IVTC solenoid. If plunger operates, check engine oil pressure and intake air system. Disconnect system harness connectors and inspect for damage or corrosion. Check PCM pins and terminals for damage or corrosion. Repair as necessary and retest.

Scheme 38

Scheme 39

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect STPS. Turn ignition on. Check voltage between STPS harness connector Brown/White wire terminal and ground. If reading is about 5 volts, go to next step. If reading is not about 5 volts, repair harness as necessary.
2. Check Ground Circuit - Turn ignition off. Check continuity between STPS harness connector Black wire terminal and ground. If continuity exists, go to next step. If continuity does not exist, repair wiring harness as necessary.
3. Check Input Signal - Disconnect PCM harness connector. Disconnect throttle actuator control module harness connector. Check continuity of Blue wire between PCM harness connector terminal No. 66 and throttle actuator control module harness connector terminal No. 4. If continuity exists, go to next step. If continuity does not exist, repair Blue wire.
4. Check continuity of White wire between STPS harness connector and throttle actuator control module harness connector terminal No. 3. If continuity exists, go to next step. If continuity does not exist, repair Blue wire.
5. Check Component - Turn ignition off. Disconnect STPS harness connector. Disconnect throttle motor harness connector. Remove intake air duct. Connect a DVOM between STPS terminals No. 1 and 2. Observe DVOM while manually opening throttle. See «SECONDARY THROTTLE POSITION SENSOR TESTING»(ref-18056-S25610527632000122900000) table. Replace sensor if readings are not as specified.

SECONDARY THROTTLE POSITION SENSOR TESTING

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Check Input Signal Circuit - Turn ignition off. Disconnect left IVTC position sensor harness connector. (Scheme 40) Disconnect PCM harness connector. Using DVOM, check continuity between IVTC position sensor harness connector terminal No. 3 (Blue/White shielded wire) and PCM harness connector terminal No. 27. If no continuity exists, repair fault in Blue/White shielded wire. If continuity exists, go to next step.
2. Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Check continuity between IVTC position sensor harness connector terminal No. 2 (Black wire) and ground. If continuity is present, go to next step. If continuity is not present, repair fault in circuit, and retest.
3. Check Camshaft - Check for accumulation of debris on or near signal portion of camshaft sensor. Remove or replace as necessary. If no faults are found, go to next step.
4. Disconnect IVTC position sensor harness connector. Loosen IVTC position sensor fixing bolt. With ambient temperature about 77°F (25°C), measure resistance between CMP sensor terminals. Resistance should be 730-890 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace sensor.
5. Disconnect system harness connectors and inspect for damage or corrosion. Check PCM pins and terminals for damage or corrosion. Repair as necessary and retest. If fault is still present, replace IVTC position sensor.

Scheme 40

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect right IVTC position sensor harness connector. (Scheme 41) Disconnect PCM harness connector. Using a DVOM, check continuity between IVTC position sensor harness connector terminal No. 3 (Red/Blue shielded wire) and PCM harness connector terminal No. 26. If no continuity exists, repair fault in Red/Blue shielded wire. If continuity exists, go to next step.
2. Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Using a DVOM, check for continuity between IVTC position sensor harness connector terminal No. 2 (Black wire) and ground. If continuity is present, go to next step. If continuity is not present, repair fault in circuit, and retest.
3. Check Camshaft Sensor - Check for accumulation of debris on or near signal portion of camshaft sensor. Remove or replace as necessary. If no faults are found, go to next step.
4. Disconnect IVTC position sensor harness connector. Loosen IVTC position sensor fixing bolt. With ambient temperature about 77°F (25°C), measure resistance between CMP sensor terminals. Resistance should be 730-890 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace sensor.
5. Disconnect system harness connectors and inspect for damage or corrosion. Check PCM pins and terminals for damage or corrosion. Repair as necessary and retest. If fault is still present, replace IVTC position sensor.

Scheme 41

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect TCS module harness connector. (Scheme 42) Disconnect PCM harness connector. Using a DVOM, check continuity between TCS module harness connector terminal No. 7 (Red wire) and PCM harness connector terminal No. 31. If no continuity exists, repair fault in Red wire. If continuity exists, go to next step.
2. Disconnect system harness connectors and inspect for damage or corrosion. Check PCM pins and terminals for damage or corrosion. Repair as necessary and retest. If fault is still present, check TAC module operation.

Scheme 42

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Turn TCS off. Drive vehicle at 43-62 MPH for 12 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Turn TCS off. Drive vehicle at 43-62 MPH for 12 seconds. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect FPCM harness connector. (Scheme 43) Turn ignition on. Using a DVOM, measure voltage between FPCM connector terminal No. 3 (Black/Yellow wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, check for blown fuse No. 33 (15-amp) or fault in Black/Yellow wire.
2. Check Ground Circuit - Turn ignition off. Disconnect dropping resistor harness connector. Check continuity between dropping resistor connector terminal No. 2 (Black wire) and ground. Also, check continuity between FPCM harness connector terminal No. 2 (Black wire) and ground. If continuity exists, go to next step. If no continuity exists, repair fault in Black wire, and retest system.
3. Disconnect fuel pump harness connector. Check continuity as follows: Between dropping resistor harness connector terminal No. 1 (Green/Red wire) and fuel pump harness connector terminal No. 3. (Green/Red wire). Continuity should be present. Between dropping resistor harness connector terminal No. 1 and FPCM connector terminal No. 1 (Green/Red wire). Continuity should be present. Between ground and fuel pump harness connector terminal No. 1 (Green/Red wire). Continuity should not be present. Between ground and FPCM connector terminal No. 3 (Black/Yellow wire). Continuity should not be present. If continuity is as specified, go to next step. If continuity is not as specified, repair fault in circuit or connector as necessary.
4. Check Output Signal Circuit - Turn ignition off. Disconnect PCM harness connector. Using a DVOM, check continuity between PCM harness connector terminal No. 15 and FPCM harness connector terminal No. 4 (Red/Blue wire). If continuity exists, go to next step. If no continuity exists, repair fault in circuit and retest.
5. Check Input Signal Circuit - Check continuity as follows: Between PCM harness connector terminal No. 74 and FPCM harness connector terminal No. 1 (Green/Red wire). Continuity should be present. Between PCM harness connector terminal No. 74 and fuel pump harness connector terminal No. 3 (Green/Red wire). Continuity should be present. Between PCM harness connector terminal No. 74 (Green/Red wire) and ground. Continuity should not be present. If continuity is as specified, go to next step. If continuity is not as specified, repair fault in Blue wire.
6. Check Dropping Resistor - Disconnect dropping resistor harness connector located in right side of luggage compartment. Measure resistance between connector terminals. (Scheme 44) If resistance is about 0.8 ohm at 77°F (25°C), go to next step. If resistance is not about 0.8 ohm at 77°F (25°C), replace dropping resistor.
7. Check FPCM - Start engine and warm to operating temperature. Turn ignition off and wait at least 5 seconds. Start engine and allow to idle. Measure voltage between FPCM connector terminals No. 1 and 2. (Scheme 45) Voltage reading should be zero volts for about 30 seconds of starting engine and about 4.4 volts after 30 seconds of starting engine. If voltage is not as specified, replace FPCM. If voltage is as specified, disconnect and reconnect harness connectors in circuit. Check PCM pin terminals for damage or corrosion. Repair if necessary, and retest.

Scheme 43

Scheme 44

Scheme 45

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition on. Check voltage between each ignition coil terminal No. 3 and ground. See «IGNITION COIL CONNECTOR TERMINAL NO»(ref-18056-S04023388632000122900000). 3 IDENTIFICATION table. If reading is about.38 volt, go to next step. If reading is not about.38 volt, repair wiring harness as necessary. IGNITION COIL CONNECTOR TERMINAL NO. 3 IDENTIFICATION Ignition Coil Wire Color No. 1 Yellow/Red No. 2 Red/Yellow No. 3 Gray No. 4 White/Red No. 5 Gray/Red No. 6 Purple/White No. 7 Blue/Red No. 8 Green/Red
2. Check Power Supply - Turn ignition off. Disconnect ignition coil harness connectors. (Scheme 46)and (Scheme 47). Turn ignition on. Measure voltage between ground and each ignition coil harness connector terminal No. 1 (White/Red wire). (Scheme 48) If battery voltage is present, go to next step. If battery voltage is not present, repair harness or connectors as necessary.
3. Check Output Signal Circuit - Leave ignition off and ignition coils disconnected. Disconnect PCM harness connector. Verify harness continuity between each ignition coil connector terminal and the following PCM connector terminals: No. 1 coil (Yellow/Red wire) and PCM terminal No. 43. No. 2 coil (Red/Blue wire) and PCM terminal No. 54. No. 3 coil (Gray wire) and PCM terminal No. 47. No. 4 coil (White/Red wire) and PCM terminal No. 53. No. 5 coil (Gray/Red wire) and PCM terminal No. 51. No. 6 coil (Purple/White wire) and PCM terminal No. 50. No. 7 coil (Blue/Red wire) and PCM terminal No. 46. No. 8 coil (Green/Red wire) and PCM terminal No. 44. If continuity is not present, repair harness or connectors as necessary. If continuity is present at each check, go to next step.
4. Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Verify harness continuity between each ignition coil connector terminal No. 2 (Black wire) and ground. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
5. Check Ignition Coil - Disconnect ignition coil harness connector. Check resistance between each ignition coil terminals No. 2 and 3. (Scheme 49) If resistance exists, ignition coil is okay. If no resistance is present, replace ignition coil.

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Raise and support front drive wheels. Start engine and bring to normal operating temperature. Turn TCS switch off, if equipped. Place shifter to "1" position. Increase engine speed to 3000 RPM. Disconnect and connect solenoid valve harness connector and verify solenoid valve makes operating sounds. (Ignore DTCs set for EGRC solenoid or EGR valve.)
2. Check Power Supply - Turn ignition off. Disconnect EGR valve and EVAP canister purge control solenoid harness connector. (Scheme 50) Turn ignition on. Measure voltage between solenoid connector terminal No. 2 (Green/Yellow wire) and ground. If battery voltage is present, go to next step. If voltage is not as specified, repair harness or connectors between solenoid and fuse box.
3. Check Output Signal Circuit - Turn ignition off. Disconnect PCM wiring harness connector. Verify harness continuity between PCM connector terminal No. 10 (Blue/Yellow wire) and EGR/EVAP canister purge control solenoid valve connector terminal for non-California vehicles. For California vehicles, EGRC solenoid valve Yellow/Blue wire terminal. On all vehicles, if continuity is present, go to next step. If continuity is not present, repair harness or connectors between solenoid and PCM.
4. Check Component - Check EGRC solenoid. See step 3) of «DTC P0400 OR P1402: EGR FUNCTION»(ref-18056-S10256475642000122900000). Repair or replace if necessary. If solenoid is okay, disconnect PCM wiring harness connector. Check connector pins for damage or corrosion. Check all connectors for clean, tight fit. If fault is still present, repeat step 1).

Scheme 50

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect EGR temperature sensor harness connector. (Scheme 51) Turn ignition on. Measure voltage between EGR temperature sensor connector terminal No. 1 (White wire) and ground. If voltage is about 5 volts, go to next step. If voltage is not as specified, repair harness or connectors as necessary.
2. Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 10) Verify harness continuity between EGR temperature sensor connector terminal No. 2 (Black wire) and engine ground. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
3. Check Component - Remove EGR temperature sensor. Immerse sensor in fluid. Measure resistance of EGR temperature sensor while varying temperature of fluid. Ensure sensor resistance is correct. See «EGR TEMPERATURE SENSOR RESISTANCE»(ref-18056-S29078416002000122900000) table. Repair or replace if necessary, and perform final check. See FINAL CHECK in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

EGR TEMPERATURE SENSOR RESISTANCE (1)

Scheme 51

Depending on equipment available, use one of the following to set DTC

1. Using GST, raise and support vehicle. Start engine and warm to normal operating temperature. Turn TCS off. Select MODE 1. Ensure ECT value is 104-212°F (40-100°C). Turn ignition off. Wait 5 seconds. Turn ignition on. Wait at least 15 seconds. Restart engine and idle for 80 seconds. Maintain the following for 80 seconds: 25-62 MPH, 1000-2100 RPM and ECT 104-212°F (40-100°C). Select MODE 7.
2. Using MIL, raise and support vehicle. Start engine and warm to normal operating temperature. Turn TCS off. Backprobe for voltage at PCM connector terminal No. 67. see scheme 2 Reading should be.8-1.5 volt. Ensure ECT value is 104-212°F (40-100°C). Turn ignition off. Wait 5 seconds. Turn ignition on. Wait at least 15 seconds. Restart engine and idle for 80 seconds. Maintain the following for 80 seconds: 25-62 MPH, 1000-2100 RPM and backprobe for voltage at PCM connector terminal No. 67. Retrieve DTC using MIL. See SELF-DIAGNOSTICS SYSTEM in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. See step 3) in «DTC P0443: EVAP CANISTER PURGE VOLUME CONTROL VALVE»(ref-18056-S12962100622000122900000) . Also, see step 3) in DTC P0446: EVAP CANISTER VENT CONTROL VALVE. Replace components as necessary. If components are okay go to next step.
2. Check EVAP Canister Saturation - Remove EVAP canister with vent control valve attached. Ensure excessive moisture or water has not accumulated in EVAP canister. Weigh EVAP canister assembly. If canister weighs more than 4 lbs. (1.8 kg), replace saturated canister. If canister weighs less than 4 lbs. (1.8 kg), check for an intermittent malfunction.

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect vacuum cut valve harness connector. Turn ignition on. Measure voltage between engine ground and connector Green/Yellow wire terminal. If battery voltage is present, go to next step. If voltage is not present, check No. 2 (10-amp) fuse. If fuse is okay, repair harness or connectors between valve and fuse box.
2. Check Output Signal Circuit - Turn ignition off. Disconnect PCM wiring harness connector. Check continuity of Light Green/Black wire between PCM terminal No. 45 and vacuum cut valve by-pass valve connector. If continuity exists, go to next step. If continuity does not exist, repair Light Green/Black wire as necessary.
3. Check Component - Remove vacuum cut by-pass valve. Check that air passage is closed (air cannot pass through valve). Apply battery voltage across valve terminals, ensure air can pass through valve. If air passage is as described, valve is okay. Replace valve if it does not operate as specified.

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Remove EVAP vacuum cut by-pass valve. Check that air passage is closed (air does not pass through valve). Apply battery voltage across valve terminals, ensure air passes through valve. If air passage opens and closes as described, vacuum cut by-pass valve is okay. Replace valve if it does not operate as described.
2. Check Component - Remove vacuum cut valve. Plug ports "C" and "D". Apply vacuum to port "A" and ensure there is no suction at port "B". (Scheme 52) Apply vacuum to port "B" and verify there is suction at port " A". Blow into port "B" and verify that a restriction in air flow exists out of port "A". Unplug ports "C" and "D". Blow into port and verify air flows freely out of port "C". Blow air into port "B" and verify air it flows freely out of port "D". Replace valve if it does not operate as described. If okay, go to next step.
3. Check Component - Remove EVAP system control pressure sensor with harness still connected. Connect a DVOM between PCM terminals No. 95 and 128. Reading should indicate 3.0-3.6 volts. Using vacuum/pressure pump, apply 2.76 in. Hg of vacuum to EVAP system. Reading should indicate 0.4-0.6 volt. Replace sensor if readings are not as specified. If readings are as specified, go to next step.
4. Check Component - Check EVAP canister vent control valve. See «DTC P1492: EVAP CANISTER VENT CONTROL VALVE»(ref-18056-S22705117872000122900000). Replace if faulty. If okay, check for an intermittent fault or repeat procedure from step 1).

Scheme 52

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Turn ignition off. Disconnect canister purge control solenoid valve. Turn ignition on. Measure voltage between PCM harness connector terminal No. 22 and ground. If reading indicates battery voltage, go to next step. If reading does not indicate battery voltage, check for an open or short in Green/Yellow wire between fuse block No. 2 (10-amp) fuse and canister purge control solenoid valve.
2. Check Output Signal Circuit - Turn ignition off. Disconnect PCM wiring harness connector. Check continuity of Yellow wire between canister purge control solenoid valve and PCM harness connector terminal No. 22. If continuity exists, go to next step. If continuity does not exist, repair Yellow wire as necessary.
3. Check Component - Remove canister purge control solenoid valve. Check that air passage between ports "A" and "B" is closed, also check that air passage between ports "A" and "C" is open. Apply battery voltage across canister purge control solenoid valve terminals. Ensure air can pass through valve ports "A" and "B", and air cannot pass through valve ports "A" and "C". If valve does not operate as described, replace valve.

Depending on equipment available, use one of the following to set DTC

1. Using GST, start engine and idle. Wait at least 15 seconds. Select MODE 7.
2. Using MIL, start engine and idle. Wait at least 15 seconds. Turn ignition off. Wait 5 seconds. Turn ignition on. Retrieve DTCs using MIL. See SELF-DIAGNOSTICS SYSTEM in the «TESTS W/CODES - INTRODUCTION»(ref-18059) article.

1. Start engine and bring to normal operating temperature. Turn ignition off. Install a vacuum gauge in line with vacuum hose to canister purge control valve. Start engine and increase to 2000 RPM. Vacuum should exist. Turn engine off. Vacuum should not exist. If readings are as specified, go to next step. If readings are not as specified, inspect vacuum hoses for leaks. If no leaks exist, replace canister purge control valve.
2. Check Component - Remove canister purge control valve and apply low air pressure to ports "A", "B" and "C" of EVAP canister purge control valve. (Scheme 25) Ensure air does not leak. Apply about 4-6 in. Hg vacuum to port "A". Air should now pass through from port "C" to "B". Replace EVAP canister purge control valve and/or water separator if it does not operate as specified. If okay, go to next step.
3. Check Canister - Remove EVAP canister. Check if water drains from EVAP canister. Weigh EVAP canister with vent control valve attached. Replace if EVAP canister weighs more than 4 lbs. (1.8 Kg). If EVAP canister weighs less than 4 lbs. (1.8 Kg), go to next step.
4. Check EVAP Purge Line - Check EVAP purge line for cracks. Inspect EVAP system components for damage or poor connections. Disconnect and reconnect harness connectors in circuit. Check PCM connector for damage or corrosion and perform final check. See FINAL CHECK in «TESTS W/CODES - INTRODUCTION»(ref-18059) article.