Engine Controls - Self-Diagnostics - Millenia 2.3L: Diagnosis Mazda Millenia I рестайлинг

SELF-DIAGNOSTIC SYSTEM

Note. For following, manufacturer recommends use of New Generation Star (NGS) tester. NGS tester is referred to as scan tool.

Using New Generation Star (NGS) Scan Tool To Retrieve DTCs

1. Apply parking brake. Place shift lever in Park (A/T) or Neutral (M/T). Block wheels. Turn off all electrical accessories. Ensure engine is at normal operating temperature.
2. Perform visual inspection. Ensure air cleaner and inlet ducts are clean, and system wiring harness is properly connected. Check for bent or broken connector terminals and corroded or loose wires. Check Powertrain Control Module (PCM), sensors and actuators for physical damage. Check engine coolant for proper level and mixture. Check for proper transmission fluid level and quality.
3. Turn ignition off. Ensure proper memory card, EPROM, is inserted into NGS scan tool. Connect service connections of adapter cable to vehicle Data Link Connector (DLC) and NGS scan tool. (Scheme 13)and (Scheme 14). Connect NGS scan tool power supply cable to power and listen for a double beep to indicate scan tool is on.
4. Start engine. If engine will not start, turn ignition on and program scan tool using the following steps: Select VEHICLE & ENGINE SELECTION. Select SELECT NEW VEHICLE YEAR & MODEL. Select DIAGNOSTIC DATA LINK. Select PCM-POWERTRAIN CONTROL MODULE. Select DIAGNOSTIC TEST MODE. Select READ/CLEAR DIAGNOSTIC TEST RESULTS. Select START and follow scan tool prompts.

Scheme 13

Scheme 14

Using New Generation Star (NGS) Scan Tool To Retrieve Pending Codes

1. Apply parking brake. Place shift lever in Park (A/T) or Neutral (M/T). Block wheels. Turn off all electrical accessories. Ensure engine is at normal operating temperature.
2. Perform visual inspection. Ensure air cleaner and inlet ducts are clean, and system wiring harness is properly connected. Check for bent or broken connector terminals and corroded or loose wires. Check Powertrain Control Module (PCM), sensors and actuators for physical damage. Check engine coolant for proper level and mixture. Check for proper transmission fluid level and quality.
3. Turn ignition off. Ensure proper memory card, EPROM, is inserted into NGS scan tool. Connect service connections of adapter cable to vehicle Data Link Connector (DLC) and NGS scan tool. See . Connect NGS scan tool power supply cable to power and listen for a double beep to indicate scan tool is on.
4. Start engine. If engine will not start, turn ignition on and program scan tool using the following steps: Select GENERIC OBD II FUNCTIONS. Select CONT. Select PENDING TROUBLE CODES. Select START and follow scan tool prompts. If scan tool reads NO DTCS AVAILABLE/NO RESPONSE, perform PID/DATA MONITOR in GENERIC OBD II FUNCTIONS and ensure that LINK COMMUNICATION ERROR, MODULE NOT RESPONDING or CHECK IGNITION STATUS AND CABLE CONNECTIONS message does not appear.

Using Generic Scan Tool

1. Apply parking brake. Place shift lever in Park (A/T) or Neutral (M/T). Block wheels. Turn off all electrical accessories. Ensure engine is at normal operating temperature.
2. Perform visual inspection. Ensure air cleaner and inlet ducts are clean, and system wiring harness is properly connected. Check for bent or broken connector terminals and corroded or loose wires. Check Powertrain Control Module (PCM), sensors and actuators for physical damage. Check engine coolant for proper level and mixture. Check for proper transmission fluid level and quality.
3. Ensure scan tool meets OBD-II standard. Follow scan tool manufacturer's operating instructions to connect equipment and record DTCs.

Diagnosis & Repair Procedure

1. Check for related service bulletins. Repair as necessary. Go to next step.
2. Turn ignition on. Check for DTCs. If DTCs are present, go to appropriate DTC and repair as necessary. If DTCs are not present, repair short to ground in Violet/Green wire between MIL and PCM. If wire is okay, reprogram or replace PCM. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

ON-BOARD SYSTEM READINESS (OSR) TEST MODE

OSR test mode indicates OBD II system operating status by indicating status of each system monitor (complete or incomplete). There are 2 types of system monitors. The first type of system monitor monitors misfires, fuel system and comprehensive components. These are continuous monitoring-type functions and will be identified by a CONT message on the scan tool. The second type of system monitor monitors, catalyst, EGR system, EVAP system and oxygen sensor. These are monitored during each drive cycle only. When the drive cycle sensor monitor is complete, a YES message will display.

Apply parking brake. Place shift lever in Park (A/T) or Neutral (M/T). Block wheels. Turn off all electrical accessories. Ensure engine is at normal operating temperature.

Perform visual inspection. Ensure air cleaner and inlet ducts are clean, and system wiring harness is properly connected. Check for bent or broken connector terminals and corroded or loose wires. Check Powertrain Control Module (PCM), sensors and actuators for physical damage. Check engine coolant for proper level and mixture. Check for proper transmission fluid level and quality.

Turn ignition off. Ensure proper memory card, EPROM, is inserted into NGS scan tool. Connect service connections of adapter cable to vehicle Data Link Connector (DLC) and NGS scan tool. (Scheme 13) Connect NGS scan tool power supply cable to power and listen for a double beep to indicate scan tool is on.

To enter OSR test mode, program scan tool using the following steps

1. Select GENERIC OBD II FUNCTIONS.
2. Select TESTS.

If system status initialization is necessary, use following procedures

1. Press CANCEL key repeatedly to return to main menu.
2. Select GENERIC OBD II FUNCTIONS.
3. Select CONT.
4. Select CLEAR DIAGNOSTIC CODES.
5. Select START and follow scan tool prompts.

CLEARING DIAGNOSTIC TROUBLE CODES

Note. DO NOT disconnect vehicle battery to clear DTCs.

Using New Generation Star (NGS) Scan Tool

Press C-ALL button and press trigger.

Ensure scan tool meets OBD II standards. Follow scan tool manufacturer's operating instructions to connect equipment and clear DTCs.

TEST EQUIPMENT

All voltage tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless specifically stated differently in testing procedure. When instructed to use a fused jumper wire, ensure fused jumper wire is equipped with an in-line 5-amp fuse.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

Note. Vehicle with immobilizer system can be identified by a solid urethane ignition key head.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DIAGNOSTIC TESTS

Note. Vehicle with immobilizer system can be identified by a solid urethane ignition key head.

Note. If Powertrain Control Module (PCM) replacement is instructed in following testing, always ensure PCM connectors and ground circuits are okay. If either are suspect, repair and repeat testing to confirm PCM malfunction.

Note. Check connectors within a suspect circuit for loose connection, loose female terminals, terminals pushed out of their connectors, water or terminal corrosion.

Note. Self-diagnostic test procedures are for use with New Generation Star (NGS) scan tool. If a generic scan tool is used, ensure scan tool is certified to OBD-II standard.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Start engine. Using scan tool, access MAF V PID data. If PID data is.64-4.9 volts go to step 11. If PID data is less than.64 volt, go to next step. If PID data is more than 4.9 volts, go to step 9.
3. Turn ignition off. Disconnect MAF sensor connector. Check for damaged or corroded MAF sensor connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to next step.
4. Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminal "C" (Red/Black wire). (Scheme 15) If battery voltage is present, go to next step. If battery voltage is not present, repair open or short of Red/Black wire between MAF sensor and main relay. See WIRING DIAGRAMS article. Go to step 17.
5. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to next step.
6. Check for continuity of Brown/Red wire between MAF sensor harness connector terminal "B" and PCM harness connector terminal No. 3E. (Scheme 35) If continuity of not present, repair open in Brown/Red wire. See WIRING DIAGRAMS article. Go to step 17. If continuity is present, go to next step.
7. Check for continuity between ground and MAF sensor harness connector terminal "B" (Brown/Red wire). Also check for continuity between MAF sensor harness connector terminals "A" (Black/Blue wire) and "B" (Brown/Red wire). (Scheme 15) If continuity is not present, replace MAF sensor and go to step 17. If continuity is present repair short to ground or short between circuits in suspect wire. See WIRING DIAGRAMS article. Go to step 17.
8. Check for continuity of Black/Blue wire between MAF sensor harness connector terminal "A" and PCM harness connector terminal No. 4D. (Scheme 35) If continuity is present, replace MAF sensor and go to step 17. If continuity is not present, repair open in Black/Blue wire. See WIRING DIAGRAMS article. Go to step 17.
9. Turn ignition on. Measure voltage between MAF sensor harness connector terminal "B" (Brown/Red wire) and ground. If voltage is not present, go to next step. If voltage is present, repair short to power in Brown/Red wire. See WIRING DIAGRAMS article. Go to step 17.
10. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to step 17.
11. Using scan tool, access PID data for ECT, TP and MAF. Warm engine until ECT PID data is more than 176°F (80°C). Drive vehicle. Read MAF PID data while TP PID data is more than 50 percent. If MAF PID data is 0.32 lbs/minute (2.4 grams/second) or more, go to step 14. If MAF PID data is less than.32 lbs/minute (2.4 grams/second), check TP operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If TP sensor resistance changes smoothly while throttle valve is gradually opened, go to next step. If TP sensor resistance does not change smoothly while throttle valve is gradually opened, replace throttle position sensor and go to step 18.
12. Turn ignition off. Disconnect MAF sensor connector. Check for damaged or corroded MAF sensor connector terminals. Repair as necessary, and go to step 18. If connector terminals are okay, go to next step.
13. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 18. If connector terminals are okay, go to step 18.
14. Using scan tool, access PID data for MAF and RPM. If MAF PID data is more than 10.6 lbs/minute (80 grams/second) with RPM PID data less than 2000 RPM, go to next step. If MAF PID is not more than 10.6 lbs/minute (80 grams/second) with RPM PID less than 2000 RPM, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
15. Turn ignition off. Disconnect MAF sensor connector. Check for damaged or corroded MAF sensor connector terminals. Repair as necessary, and go to step 19. If connector terminals are okay, go to next step.
16. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 19. If connector terminals are okay, go to step 19.
17. Reconnect all connectors. Start engine. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, ensure MAF V PID data is 0.64-4.9 volts. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0100 is present, replace PCM and go to step 20. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0100 is not present, go to step 20.
18. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, access PID data for ECT, TP and MAF. Warm engine until ECT PID data is more than 176°F (80°C). Drive vehicle. Ensure MAF PID data is.32 lbs/minute (2.4 grams/second) and TP PID data is more than 50 percent for more than 5 seconds. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0100 is present, replace PCM and go to step 20. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0100 is not present, go to step 20.
19. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, access PID data for RPM and MAF. Warm engine until ECT PID data is more than 176°F (80°C). Ensure MAF PID data is 10.6 lbs/minute (80 grams/second) and engine speed is less than 2000 RPM. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0100 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0100 is not present, go to next step.
20. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 15

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0105 is present, go to next step. If DTC P0105 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Start engine. Using scan tool, access MAP V PID data. If PID data is 0.2-4.9 volts go to step 13. If PID data is less than 0.2 volt, go to next step. If PID data is more than 4.9 volts, go to step 8.
4. Turn ignition off. Disconnect MAP sensor connector. (Scheme 22) Using scan tool, access MAP V PID data. If PID data is more than 4.9 volts, go to next step. If PID data 4.9 volts or less, go to step 6.
5. Turn ignition on. Measure voltage between ground and MAP sensor harness connector terminal "C" (Light Green/Red wire). If 4.5-5.5 volts are present, check for damaged or corroded MAP sensor connector terminals. Repair as necessary, and go to step 7. If connector terminals are okay, replace MAP sensor and go to step 7. If 4.5-5.5 volts are not present, repair open in Light Green/Red wire between MAP sensor and PCM. See WIRING DIAGRAMS article. Go to step 7.
6. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for continuity between MAP sensor harness connector terminal "B" (Green/Orange wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Green/Orange wire. Go to step 18.
7. Check for continuity between MAP sensor harness connector terminal "A" (Black/Yellow wire) and "B" (Green/Orange wire). If continuity is not present, go to step 18. If continuity is present, repair short between circuits and go to step 18.
8. Turn ignition off. Disconnect MAP sensor connector. (Scheme 22) Check for damaged or corroded MAP sensor connector terminals. Repair as necessary, and go to step 18. If connector terminals are okay, go to next step.
9. Check for continuity between MAP sensor harness connector terminal "A" (Black/Yellow wire) and ground. If continuity is present, go to next step. If continuity is not present, check for continuity of Black/Yellow wire between MAP sensor terminal "A" and PCM harness connector terminal No. 3AB. (Scheme 35) If continuity is present in Black/Yellow wire, go to step 18. If continuity is not present, repair open in Black/Yellow wire. Go to step 18.
10. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 18. If connector terminals are okay, go to next step.
11. Check for continuity between MAP sensor harness connector terminal "C" (Light Green/Red wire) and "B" (Green/Orange wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits and go to step 18.
12. Check for continuity of Green/Orange wire between MAP sensor harness connector terminal "B" and PCM harness connector terminal No. 3U. (Scheme 35) If continuity is present, go to step 18. If continuity is not present, repair open in Green/Orange wire. Go to next step.
13. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1487 is present, repair that DTC first. See «DTC P1487: MAP SENSOR SOLENOID VALVE CIRCUIT MALFUNCTION»(ref-11774-S21301299532000112700000). If DTC P1487 is not present, go to next step.
14. Ensure vacuum hoses between MAP sensor and MAP sensor solenoid and between MAP sensor solenoid and intake manifold are not loose damaged or improperly connected. Repair as necessary and go to step 18. If vacuum hoses are okay, go to next step.
15. Check MAP sensor solenoid air filter. Replace as necessary and go to step 18. If air filter is okay, go to next step.
16. Disconnect vacuum hoses from MAP sensor. Disconnect vacuum hose from MPA sensor solenoid valve lower port. Apply vacuum to MAP sensor solenoid valve lower port. Turn ignition on. Using scan tool, activate MAP sensor solenoid valve. If MAP sensor solenoid valve opens and vacuum is released, go to next step. If MAP sensor solenoid valve does not open and vacuum is not released, replace MAP sensor solenoid and go to step 18.
17. Check MAP sensor operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace MAP sensor as necessary and go to next step. If MAP sensor is okay, go to next step.
18. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, perform PCM adaptive memory drive mode and EGR monitor repair verification drive mode. See «DRIVE MODES»(ref-11774-S12820596512001040500000). Using scan tool, access MAP V PID data. Ensure PID data is 0.2-4.9 volts. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0105 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0105 is not present, go to next step.
19. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 16

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. See «DTC P1110: AIR INTAKE RESONATOR IAT CIRCUIT MALFUNCTION»(ref-11774-S14677065472000112700000). If DTC P0110 is present, go to next step. If DTC P0110 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Start engine. Using scan tool, access IAT V PID data. If PID data is.1-4.8 volts, go to step 15. If PID data is less than.1 volt go to next step. If PID data is more than 4.8 volts, go to step 8.
4. Turn ignition off. Disconnect air cleaner IAT sensor connector. (Scheme 22) Check for damaged or corroded air cleaner IAT sensor connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to next step.
5. Turn ignition on. Using scan tool, access IAT V PID data. If PID data is less than.1 volt go to next step. If PID data is.1 volt or more, replace air cleaner IAT sensor and go to step 17.
6. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for continuity between air cleaner IAT sensor harness connector terminal "A" (Red/Blue wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Red/Blue wire. See WIRING DIAGRAMS article. Go to step 17.
7. Check for continuity between air cleaner IAT sensor harness connector terminals. If continuity is not present, go to next step. If continuity is present, repair short between circuits and go to step 17.
8. Turn ignition off. Disconnect air cleaner IAT sensor connector. Check for damaged or corroded air cleaner IAT sensor connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to next step.
9. Measure resistance between air cleaner IAT sensor terminals. If resistance is 2600 ohms or less, go to next step. If resistance is more than 2600 ohms, replace air cleaner IAT sensor and go to step 17.
10. Turn ignition on. Measure voltage between ground and air cleaner IAT sensor harness connector terminal "A" (Red/Blue wire). If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Red/Blue wire between IAT and PCM connector terminal No. 3V. See WIRING DIAGRAMS article. Go to step 17.
11. Measure voltage between ground and air cleaner IAT sensor harness connector terminal "B" (Black/Yellow wire). If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Black/Yellow wire between IAT and PCM connector terminal No. 3AB. See WIRING DIAGRAMS article. Go to step 17.
12. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to next step.
13. Check for continuity of Red/Blue wire between air cleaner IAT sensor harness connector terminal "A" and PCM harness connector terminal No. 3V. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Red/Blue wire. See WIRING DIAGRAMS article. Go to step 17.
14. Check for continuity of Black/Yellow wire between air cleaner IAT sensor harness connector terminal "B" and PCM harness connector terminal No. 3AB. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Black/Yellow wire. See WIRING DIAGRAMS article. Go to step 17.
15. Disconnect air cleaner IAT sensor connector. Measure resistance between air cleaner IAT sensor terminals. If resistance is 2650 ohms or more, go to next step. If resistance is less than 2650, replace air cleaner IAT sensor and go to step 17.
16. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, go to next step.
17. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start and run engine under freeze frame conditions recorded in first step. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0110 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0110 is not present, go to next step.
18. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0115 is present, go to next step. If DTC P0115 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Start engine. Using scan tool, access ECT V PID data. If PID data is 0.2-4.9 volts, go to step 14. If PID data is less than.2 volt go to next step. If PID data is more than 4.9 volts, go to step 7.
4. Turn ignition off. Disconnect ECT sensor connector. (Scheme 22) Check for damaged or corroded ECT sensor connector terminals. Repair as necessary, and go to step 14. If connector terminals are okay, go to next step.
5. Disconnect PCM and instrument cluster connectors. Check for continuity between ECT sensor harness connector terminal "A" (Red/Green wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Red/Green wire between ECT sensor and PCM connector terminal No. 3Q. See WIRING DIAGRAMS article. Go to step 14.
6. Check for continuity between ECT sensor harness connector terminals. If continuity is not preset, go to step 14. If continuity is present repair short between wires and go to step 14.
7. Turn ignition off. Disconnect ECT sensor connector. (Scheme 22) Check for damaged or corroded ECT sensor connector terminals. Repair as necessary, and go to step 14. If connector terminals are okay, go to next step.
8. Connect a fused jumper wire between ECT sensor harness connector terminals. Using scan tool, access ECT V PID data. If PID data is zero volts, replace ECT sensor and go to step 14. If PID data is not zero volts, go to next step.
9. Remove fused jumper wire. Disconnect instrument cluster connector. Check for damaged or corroded instrument cluster connector terminals. Repair as necessary, and go to step 14. If connector terminals are okay, go to next step.
10. Turn ignition on. Measure voltage between ECT sensor harness connector terminal "A" (Red/Green wire) and ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Red/Green wire between ECT and PCM connector terminal No. 3Q. See WIRING DIAGRAMS article. Go to step 14.
11. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 14. If connector terminals are okay, go to next step.
12. Check for continuity of Red/Green wire between ECT sensor harness connector terminal "A" and PCM harness connector terminal No. 3Q. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Red/Green wire. See WIRING DIAGRAMS article. Go to step 14.
13. Check for continuity of Black/Yellow wire between ECT sensor harness connector terminal "B" and PCM harness connector terminal No. 3AB. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Red/Green wire. See WIRING DIAGRAMS article. Go to next step.
14. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0115 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0115 is not present, go to next step.
15. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0120 is present, go to next step. If DTC P0120 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Start engine. Using scan tool, access TP V PID data. If PID data is 0.1-4.8 volts, go to step 19. If PID data is less than 0.1 volt go to next step. If PID data is more than 4.8 volts, go to step 9.
4. Turn ignition off. Disconnect TP sensor connector. (Scheme 22) Turn ignition on. Measure voltage between ground and TP sensor harness connector terminal "B" (Light Green/Red wire). If 4.5-5.5 volts is present, go to step 6. If 4.5-5.5 volts is not present, go to next step.
5. Turn ignition off. Disconnect in-line, Black, 10-pin connector X18. (Scheme 22) Turn ignition on. Measure voltage between female side of in-line, Black, 10-pin connector X18 terminal "D" (Light Green/Red wire) and ground. (Scheme 17) If 4.5-5.5 volts are present, repair open in Light Green/Red wire between male side of in-line, Black, 10-pin connector X18 and TP sensor. Go to step 32. If 4.5-5.5 volts are not present, repair open in Light Green/Red wire between female side of in-line, Black, 10-pin connector X18 and PCM connector terminal No. 3A. Go to step 32.
6. Turn ignition off. Check for continuity between female side of in-line, Black, 10-pin connector X18 terminal "F" (Yellow/Green wire) and ground. (Scheme 17) If continuity is not present, go to next step. If continuity is present, repair short to ground in Yellow/Green wire between in-line, Black, 10-pin connector X18 and TP sensor. Go to step 32.
7. Check for continuity between male side of in-line, Black, 10-pin connector X18 terminal "F" (Yellow/Green wire) and ground. (Scheme 17) If continuity is not present, repair short between Yellow/Green wire and Black/Yellow wire located between TPS sensor and PCM. See WIRING DIAGRAMS article. Go to next step. If continuity is present, repair short to ground in Yellow/Green wire between in-line, Black, 10-pin connector X18 and PCM connector terminal No. 3B. Go to step 32.
8. Disconnect Transmission Control Module (TCM) connector. Check for continuity between TCM harness connector terminal No. 2T (Yellow/Green wire) and ground. (Scheme 33) If continuity is not present, go to step 32. If continuity is present, repair short to ground in Yellow/Green wire between TCM and TP sensor. See WIRING DIAGRAMS article. Go to step 32.
9. Turn ignition off. Disconnect in-line, Black, 10-pin connector X18 connector. Check for continuity of Yellow/Green wire between TP sensor harness connector terminal "B" and male side of in-line, Black, 10-pin connector X18 terminal "F". (Scheme 17) If continuity is present, go to next step. If continuity is not present, repair open in Yellow/Green wire. Go to step 32.
10. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for continuity of Yellow/Green wire between female side of in-line, Black, 10-pin connector X18 terminal "F" and PCM harness connector terminal No. 3B. (Scheme 17)and (Scheme 35). If continuity is present, go to next step. If continuity is not present, repair open in Yellow/Green wire. Go to step 32.
11. Turn ignition off. Disconnect TP sensor connector. (Scheme 22) Check for damaged or corroded TP sensor connector terminals. Repair as necessary, and go to step 32. If connector terminals are okay, go to next step.
12. Measure resistance between TP sensor connector terminals. Resistance should be 2870-5330 ohms between TP sensor connector terminals "A" and "D", and with TP sensor in wide open throttle, less than 4100 ohms between TP sensor connector terminals "B" and "D". (Scheme 18) If resistance is as specified, go to next step. If resistance is not as specified, replace TP sensor and go to step 32.
13. Check for continuity between TP sensor harness connector terminal "D" (Black/Yellow wire) and ground. If continuity is present, go to step 17. If continuity is not present, go to next step.
14. Disconnect in-line, Black, 10-pin connector X18. (Scheme 22) Check for damaged or corroded in-line, Black, 10-pin connector X18 pins. Repair as necessary, and go to step 32. If connector terminals are okay, go to next step.
15. Check for continuity between male side of in-line, Black, 10-pin connector X18 terminal "B" (Black/Yellow wire) and ground. (Scheme 17) If continuity is not present, go to next step. If continuity is present, repair short to ground in Black/Yellow wire between in-line, Black, 10-pin connector X18 and TP sensor connector terminal "D". See WIRING DIAGRAMS article. Go to step 32.
16. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 32. If connector terminals are okay, repair open in Black/Yellow wire between in-line, Black, 10-pin connector X18 and PCM connector terminal No. 3AB. See WIRING DIAGRAMS article. Go to step 32.
17. Disconnect in-line, Black, 10-pin connector X18. Check for continuity between male side of in-line, Black, 10-pin connector X18 terminals "D" and "F". If continuity is not present, go to next step. If continuity is present, repair short between circuits and go to step 32.
18. Disconnect appropriate PCM connector. Check for continuity between female side of in-line, Black, 10-pin connector X18 terminals "D" and "F". If continuity is not present, go to next step. If continuity is present, repair short between circuits and go to step 32.
19. Start engine. Using scan tool, access PID data for ECT, TP V and MAF. Warm engine until ECT PID data is more than 176°F (80°C). Drive vehicle. Check TP V PID data when MAF PID data is more than 19.8 lbs/minute (150 grams/second). If TP V PID data is 0.6 volt or less, go to step 21. If TP V PID data is more than 0.6 volt, go to next step.
20. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, access PID data for TP V, MAF and RPM. Check TP V PID data when MAF PID data is less than.3 lbs/minute (2.4 grams/second) and RPM PID data is more than 500 RPM. If TP V PID data is less than 2.5 volts, go to step 32. If TP V PID data is 2.5 volts or more, go to step 26.
21. Turn ignition off. Disconnect TP sensor connector. Check for damaged or corroded TP sensor connector terminals. Repair as necessary, and go to step 32. If connector terminals are okay, go to next step.
22. Check TP sensor operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as necessary and go to step 32. If TP sensor is okay, go to next step.
23. Disconnect in-line, Black, 10-pin connector X18. Check for damaged or corroded in-line, Black, 10-pin connector X18 pins. Repair as necessary, and go to step 32. If connector terminals are okay, go to next step.
24. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 32. If connector terminals are okay, go to next step.
25. Reconnect in-line, Black, 10-pin connector X18 and PCM connector. Turn ignition on. Backprobing at PCM, measure voltage between PCM connector terminal No. 3A (Light Green/Red wire) and TP sensor harness connector terminal "A" (Light Green/Red wire). Also measure voltage between PCM connector terminal No. 3B (Yellow/Green wire) and TP sensor harness connector terminal "B" (Yellow/Green wire). If zero volts is present, go to step 32. If zero volts is not present, check for damaged or corroded line, Black, 10-pin connector X18 pins and go to step 32.
26. Using scan tool, access MAF PID data. Drive vehicle. If PID data does not change as driving conditions change, check suspect MAF sensor circuits. Repair as necessary and go to step 32. If circuits are okay, check MAF sensor operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as necessary. If PID data changes as driving conditions change, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
27. Turn ignition off. Disconnect TP sensor connector. (Scheme 22) Check for damaged or corroded TP sensor connector terminals. Repair as necessary, and go to step 32. If connector terminals are okay, go to next step.
28. Measure resistance between TP sensor harness connector terminal "A" (Black/Yellow wire) and ground. If zero ohms is present, go to next step. If zero ohms is not present, repair damaged or corroded in-line, Black, 10-pin connector X18 or PCM connector and go to step 32.
29. Check TP sensor operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as necessary and go to step 32. If TP sensor is okay, go to next step.
30. Disconnect in-line, Black, 10-pin connector X18. Check for damaged or corroded in-line, Black, 10-pin connector X18 pins. Repair as necessary, and go to step 32. If connector terminals are okay, go to next step.
31. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, go to next step.
32. Reconnect all connectors. Start engine. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, access TP V PID data. Ensure PID data is 0.1-4.8 volts. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0120 is present, replace PCM and go to step 35. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0120 is not present, go to step 35.
33. Using scan tool, access PID data for ECT, TP V and MAF. Warm engine until ECT PID data is more than 176°F (80°C). Drive vehicle. Ensure MAF PID data is more than 19.8 lbs/minute (150 grams/second) and TP V PID data is 0.6 volt for more than 5 seconds. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0120 is present, replace PCM and go to step 35. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0120 is not present, go to step 35.
34. Using scan tool, access PID data for RPM, TP V and MAF. Ensure TP V PID data is less than 2.5 volts, MAF PID data is less than 0.3 lbs/minute (2.4 grams/second) and RPM PID data is more than 500 RPM. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0120 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0120 is not present, go to next step.
35. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 17

Scheme 18

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Start engine and allow it to reach normal operating temperature. Using scan tool, access ECT PID data. If PID data is 140°F (60°C) or less, go to next step. If PID data is more than 140°F (60°C), problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Disconnect ECT sensor connector. Check for damaged or corroded ECT sensor connector terminals. Repair as necessary, and go to step 6 . If connector terminals are okay, go to next step.
4. Check ECT sensor operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as necessary and go to step 6 . If ECT sensor is okay, go to next step.
5. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, go to next step.
6. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, access ECT PID data. Ensure PID data is less than 68°F (20°C). Start engine and allow it to reach normal operating temperature. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0125 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0125 is not present, go to next step.
7. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTCs P0135, P0442, P0443, P0455 or P1450 are present, repair those DTC(s) first and go to step 14 . If DTCs are not present, go to next step.
3. Check for DTC P0130 in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, repair any other DTC present in FREEZE FRAME DATA first.
4. Start engine and allow it to reach normal operating temperature. Using scan tool, access FHO2SR. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display right front HO2S voltage is more than .55 volt during acceleration (rich condition) and is less than .55 volt during deceleration fuel cut (lean condition). If voltage is not as specified, go to next step. If voltage is as specified, go to step 7 .
5. Check right front HO2S installation. If no problem is found, go to next step. If a problem is found, repair as necessary and go to step 14 .
6. Check for exhaust leak upstream of right front HO2S. If a problem is found, repair as necessary and go to step 14 . If no problem is found, replace right front HO2S and go to step 14 .
7. Using scan tool, access LONGFT1 PID data. Compare to FREEZE FRAME DATA. If fuel trim is shifting to rich condition, go to next step. If fuel trim is shifting to lean condition, go to step 10 .
8. Turn ignition off. Check for excessive fuel line pressure with engine running. See BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 13 . If fuel line pressure is more than 41 psi (2.9 kg/cm 2 ), go to next step.
9. Ensure engine is running. Check for vacuum at fuel pressure regulator. If vacuum is present, check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, check fuel return line for plugging. Repair or replace as necessary. If fuel return line is okay, replace pressure regulator and go to step 14 . If vacuum is not present, ensure fuel pressure regulator vacuum hose is okay. Repair or replace as necessary. If vacuum hose is okay, replace PRC solenoid valve and go to step 14 .
10. Turn ignition off. Check for low fuel line pressure with engine running. See BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 13 . If fuel line pressure is less than 30 psi (2.1 kg/cm 2 ), go to next step.
11. Check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If maximum pressure is 92-116 psi (6.4-8.2 kg/cm 2 ), go to next step. If maximum pressure is not 92-116 psi (6.4-8.2 kg/cm 2 ), check for open fuel pump circuits. Repair as necessary and go to step 14 . If fuel pump circuits are okay, replace fuel pump and go to step 14 .
12. Check for leaks in fuel system downstream of fuel pump. If any leaks are found, repair as necessary and go to step 14 . If no leaks are found, check for plugging at fuel filter and fuel inlet filter (sock). If plugging is present, check fuel tank for debris. If fuel tank is okay, replace fuel filter and go to step 14 . If fuel tank has debris, clean tank, replace fuel inlet filter (sock) and fuel filter. If fuel tank, fuel filter and fuel inlet filter (sock) are okay, replace fuel pressure regulator and go to step 14 .
13. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak and go to next step.
14. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, perform PCM adaptive memory drive mode and HO2S/TWC monitor repair verification drive mode. See «DRIVE MODES»(ref-11774-S12820596512001040500000) . Stop vehicle and access ON BOARD SYSTEM READINESS TEST menu of GENERIC OBD II FUNCTION and check DRIVE MODE completion status. Ensure RFC for front HO2S changes to YES. If RFC for front HO2S did not change to YES, perform drive modes again. Using scan tool, verify TEST #10:01:11, #10:02:11 or #10:03:11 in DIAGNOSTIC MONITORING TEST RESULTS. If all tests are less than MAX value, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If any test is not less than MAX value, go to next step.
15. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any DTCs other than P1170 is present, repair that DTC first. If no DTCs are present, go to next step.
3. Check for DTC P0134 in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, repair any other DTC present in FREEZE FRAME DATA first.
4. Start engine and allow it to reach normal operating temperature. Using scan tool, access FHO2SR. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display right front HO2S voltage is more than.55 volt during acceleration (rich condition) and is less than.55 volt during deceleration fuel cut (lean condition). If voltage is not as specified, go to next step. If voltage is as specified, go to step 7.
5. Check right front HO2S installation. If no problem is found, go to next step. If a problem is found, repair as necessary and go to step 9.
6. Check for exhaust leak upstream of right front HO2S. If a problem is found, repair as necessary and go to step 9. If no problem is found, check for open or short to ground in Gray wire between right front HO2S harness connector terminal "A" and PCM harness connector terminal No. 3I. (Scheme 19) If wire is okay, replace right front HO2S and go to step 9.
7. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak and go to step 9.
8. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to next step. If engine compression is not as specified, repair as necessary and go to next step.
9. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, access PID data for RPM and ECT. Ensure ECT PID is more than 140°F (60°C) and RPM PID is more than 1500 RPM for more than 99 seconds. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0134 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0134 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off. Disconnect right front HO2S connector. Check for damaged or corroded right front HO2S connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
3. Turn ignition on. Measure voltage between right front HO2S harness connector terminal "B" (Brown wire) and ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Brown wire between right front HO2S and PCM connector terminal No. 4E. See WIRING DIAGRAMS article. Go to step 9.
4. Turn ignition off. Measure resistance between right front HO2S connector terminals "C" (Black/White wire) and "B" (Brown wire). (Scheme 19) If resistance is 5-7 ohms, go to next step. If resistance is not 5-7 ohms, replace right front HO2S and go to step 9.
5. Turn ignition on. Measure voltage between right front HO2S harness connector terminals "C" (Black/White wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire between right front HO2S and main relay. See WIRING DIAGRAMS article. Go to step 9.
6. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
7. Check for continuity between right front HO2S harness connector terminal "B" (Brown wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Brown wire between right front HO2S and PCM connector terminal No. 4E.
8. Check for continuity of Brown wire between right front HO2S harness connector terminal "B" and PCM harness connector terminal No. 4E. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Brown wire. See WIRING DIAGRAMS article. Go to next step.
9. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0135 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0135 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 19

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTCs are present, go to appropriate test. If no other DTCs are present, go to next step.
3. Check for DTC P0138 in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
4. Turn ignition off. Disconnect right rear HO2S connector. Turn ignition on. Measure voltage between ground and right rear HO2S harness connector terminal "A" (White wire). (Scheme 20) If battery voltage is not present, go to next step. If battery voltage is present, repair short to power on White wire between right rear HO2S and PCM connector terminal No. 3D. See WIRING DIAGRAMS article. Go to step 6.
5. Start engine. Using scan tool, access RHO2SR PID data. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine 10 or more times. If PID data is always more than.45 volt, replace right rear HO2S. If PID data is less than.45 volt when revving engine, go to next step.
6. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Perform PCM adaptive memory drive mode and HO2S/TWC monitor repair verification drive mode. See «DRIVE MODES»(ref-11774-S12820596512001040500000). Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0138 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0138 is not present, go to next step.
7. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. If no other DTCs are present, testing is complete. If any other DTCs are present, go to applicable test and repair.

Scheme 20

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any DTCs other than P1170 is present, repair that DTC first. If no DTCs are present, go to next step.
3. Check for DTC P0140 in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, repair any other DTC present in FREEZE FRAME DATA first.
4. Start engine and allow it to reach normal operating temperature. Using scan tool, access RHO2SR. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine 10 times. Scan tool should display right rear HO2S voltage is more than.55 volt during acceleration (rich condition) at least one time during engine racing. If voltage is not as specified, go to next step. If voltage is as specified, go to step 7.
5. Check right rear HO2S installation. If no problem is found, go to next step. If a problem is found, repair as necessary and go to step 9.
6. Check for exhaust leak upstream of right rear HO2S. If a problem is found, repair as necessary and go to step 9. If no problem is found, check for open or short to ground in White wire between right rear HO2S connector terminal "A" and PCM connector terminal No. 3D. (Scheme 20) If wire is okay, replace right rear HO2S and go to step 9.
7. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak and go to step 9.
8. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to next step. If engine compression is not as specified, repair as necessary and go to next step.
9. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, access PID data for RPM and ECT. Ensure ECT PID data is more than 140°F (60°C) and RPM PID data is more than 1500 RPM for more than 99 seconds. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0140 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0140 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off. Disconnect right rear HO2S connector. Check for damaged or corroded right rear HO2S connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
3. Turn ignition on. Measure voltage between right rear HO2S harness connector terminal "D" (Black/Red wire) and ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Black/Red wire between right rear HO2S and PCM connector terminal No. 3C. See WIRING DIAGRAMS article. Go to step 9.
4. Turn ignition off. Measure resistance between right rear HO2S connector terminals "C" (Red/Black wire) and "D" (Black/Red wire). (Scheme 20) If resistance is about 5-7 ohms, go to next step. If resistance is not about 5-7 ohms, replace right rear HO2S and go to step 9.
5. Turn ignition on. Measure voltage between right rear HO2S harness connector terminals "C" (Red/Black wire) and ground. (Scheme 20) If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/Black wire between right rear HO2S and main relay. See WIRING DIAGRAMS article. Go to step 9.
6. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
7. Check for continuity between right rear HO2S harness connector terminal "D" (Black/Red wire) and ground. (Scheme 20) If continuity is not present, go to next step. If continuity is present, repair short to ground in Black/Red wire between right rear HO2S and PCM connector terminal No. 3C. See WIRING DIAGRAMS article. Go to step 9.
8. Check for continuity of Black/Red wire between right rear HO2S harness connector terminal "D" and PCM harness connector terminal No. 3C. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Black/Red wire. See WIRING DIAGRAMS article. Go to next step.
9. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0141 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0141 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTCs P0155, P0442, P0443, P0455 or P1450 are present, repair those DTC(s) first and go to step 14 . If DTCs are not present, go to next step.
3. Check for DTC P0150 in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, repair any other DTC present in FREEZE FRAME DATA first.
4. Start engine and allow it to reach normal operating temperature. Using scan tool, access FHO2SL. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display right front HO2S voltage is more than .55 volt during acceleration (rich condition) and is less than .55 volt during deceleration fuel cut (lean condition). If voltage is not as specified, go to next step. If voltage is as specified, go to step 7 .
5. Check left front HO2S installation. If no problem is found, go to next step. If a problem is found, repair as necessary and go to step 14 .
6. Check for exhaust leak upstream of left front HO2S. If a problem is found, repair as necessary and go to step 14 . If no problem is found, replace left front HO2S and go to step 14 .
7. Using scan tool, access LONGFT2 PID data. Compare to FREEZE FRAME DATA. If fuel trim is shifting to rich condition, go to next step. If fuel trim is shifting to lean condition, go to step 10 .
8. Turn ignition off. Check for excessive fuel line pressure with engine running. See BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 13 . If fuel line pressure is more than 41 psi (2.9 kg/cm 2 ), go to next step.
9. Ensure engine is running. Check for vacuum at fuel pressure regulator. If vacuum is present, check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, check fuel return line for plugging. Repair or replace as necessary. If fuel return line is okay, replace pressure regulator and go to step 14 . If vacuum is not present, ensure fuel pressure regulator vacuum hose is okay. Repair or replace as necessary. If vacuum hose is okay, replace PRC solenoid valve and go to step 14 .
10. Turn ignition off. Check for low fuel line pressure with engine running. See BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 13 . If fuel line pressure is less than 30 psi (2.1 kg/cm 2 ), go to next step.
11. Check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If maximum pressure is 92-116 psi (6.4-8.2 kg/cm 2 ), go to next step. If maximum pressure is not 92-116 psi (6.4-8.2 kg/cm 2 ), check for open fuel pump circuits. Repair as necessary and go to step 14 . If fuel pump circuits are okay, replace fuel pump and go to step 14 .
12. Check for leaks in fuel system downstream of fuel pump. If any leaks are found, repair as necessary and go to step 14 . If no leaks are found, check for plugging at fuel filter and fuel inlet filter (sock). If plugging is present, check fuel tank for debris. If fuel tank is okay, replace fuel filter and go to step 14 . If fuel tank has debris, clean tank, and replace fuel inlet filter (sock) and fuel filter. If fuel tank, fuel filter and fuel inlet filter (sock) are okay, replace fuel pressure regulator and go to step 14 .
13. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak and go to next step.
14. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, perform PCM adaptive memory drive mode and HO2S/TWC monitor repair verification drive mode. See «DRIVE MODES»(ref-11774-S12820596512001040500000) . Stop vehicle and access ON BOARD SYSTEM READINESS TEST menu of GENERIC OBD II FUNCTION and check DRIVE MODE completion status. Ensure RFC for front HO2S changes to YES. If RFC for front HO2S did not change to YES, perform drive modes again. Using scan tool, verify TEST #10:01:21, #10:02:21 or #10:03:21 in DIAGNOSTIC MONITORING TEST RESULTS. If all tests are less than MAX value, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If any test is not less than MAX value, go to next step.
15. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any DTCs other than P1173 is present, repair that DTC first. If no DTCs are present, go to next step.
3. Check for DTC P0154 in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, repair any other DTC present in FREEZE FRAME DATA first.
4. Start engine and allow it to reach normal operating temperature. Using scan tool, access FHO2SL. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display left front HO2S voltage is more than.55 volt during acceleration (rich condition) and is less than.55 volt during deceleration fuel cut (lean condition). If voltage is not as specified, go to next step. If voltage is as specified, go to step 7.
5. Check left front HO2S installation. If no problem is found, go to next step. If a problem is found, repair as necessary and go to step 9.
6. Check for exhaust leak upstream of left front HO2S. If a problem is found, repair as necessary and go to step 9. If no problem is found, check for open or short to ground in Yellow wire between left front HO2S connector terminal "A" and PCM connector terminal No. 3M. (Scheme 16) If wire is okay, replace left front HO2S and go to step 9.
7. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak and go to step 9.
8. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to next step. If engine compression is not as specified, repair as necessary and go to next step.
9. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, access PID data for RPM and ECT. Ensure ECT PID data is more than 140°F (60°C) and RPM PID data is more than 1500 RPM for more than 99 seconds. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0154 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0154 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off. Disconnect left front HO2S connector. Check for damaged or corroded left front HO2S connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
3. Turn ignition on. Measure voltage between left front HO2S harness connector terminal "B" (White/Blue wire) and ground. (Scheme 16) If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in White/Blue wire between left front HO2S and PCM connector terminal No. 4I. See WIRING DIAGRAMS article. Go to step 9.
4. Turn ignition off. Measure resistance between left front HO2S connector terminals "C" (Black/White wire) and "B" (White/Blue wire). (Scheme 16) If resistance is 5-7 ohms, go to next step. If resistance is not 5-7 ohms, replace left front HO2S and go to step 9.
5. Turn ignition on. Measure voltage between left front HO2S harness connector terminals "C" (Black/White wire) and ground. (Scheme 16) If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire between left front HO2S and main relay. See WIRING DIAGRAMS article. Go to step 9.
6. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
7. Check for continuity between left front HO2S harness connector terminal "B" (White/Blue wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in White/Blue wire between left front HO2S and PCM connector terminal No. 4I. See WIRING DIAGRAMS article. Go to step 9.
8. Check for continuity of White/Blue wire between left front HO2S harness connector terminal "B" and PCM harness connector terminal No. 4I. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in White/Blue wire. See WIRING DIAGRAMS article. Go to next step.
9. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0155 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0155 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTCs are present, go to appropriate test. If no other DTCs are present, go to next step.
3. Check if DTC P0158 is present in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
4. Turn ignition off. Disconnect left rear HO2S connector. Turn ignition on. Measure voltage between ground and left rear HO2S harness connector terminal "A" (Green wire). If battery voltage is not present, go to next step. If battery voltage is present, repair short to power on Green wire between left rear HO2S and PCM connector terminal No. 3H. See WIRING DIAGRAMS article. Go to step 6 .
5. Start engine. Using scan tool, access RHO2SL PID data. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine 10 or more times. If PID data is always more than .45 volt, replace left rear HO2S. If PID data is less than .45 volt when revving engine, go to next step.
6. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Perform PCM adaptive memory drive mode and HO2S/TWC monitor repair verification drive mode. See «DRIVE MODES»(ref-11774-S12820596512001040500000) . Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0158 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0158 is not present, go to next step.
7. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. If no other DTCs are present, testing is complete. If any other DTCs are present, go to applicable test and repair.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any DTC other than P1173 is present, repair that DTC first. If no DTCs are present, go to next step.
3. Check for DTC P0160 in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, repair any other DTC present in FREEZE FRAME DATA first.
4. Start engine and allow it to reach normal operating temperature. Using scan tool, access RHO2SL. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine 10 times. Scan tool should display left rear HO2S voltage is more than.55 volt at least once during engine racing. If voltage is not as specified, go to next step. If voltage is as specified, go to step 7.
5. Check left rear HO2S installation. If no problem is found, go to next step. If a problem is found, repair as necessary and go to step 9.
6. Check for exhaust leak upstream of left rear HO2S. If a problem is found, repair as necessary and go to step 9. If no problem is found, check for open or short to ground in Green wire between left rear HO2S connector terminal "A" and PCM connector terminal No. 3H. (Scheme 20) If wire is okay, replace left rear HO2S and go to step 9.
7. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak and go to step 9.
8. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to next step. If engine compression is not as specified, repair as necessary and go to next step.
9. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, access PID data for RPM and ECT. Ensure ECT PID data is more than 140°F (60°C) and RPM PID data is more than 1500 RPM for more than 98 seconds. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0160 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0160 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off. Disconnect left rear HO2S connector. Check for damaged or corroded left rear HO2S connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
3. Turn ignition on. Measure voltage between left rear HO2S harness connector terminal "D" (Black/Blue wire) and ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Black/Blue wire between left rear HO2S and PCM connector terminal No. 3G.
4. Turn ignition off. Measure resistance between left rear HO2S connector terminals "C" (Red/Black wire) and "D" (Black/Blue wire). (Scheme 20) If resistance is about 5-7 ohms, go to next step. If resistance is not about 5-7 ohms, replace left rear HO2S and go to step 9.
5. Turn ignition on. Measure voltage between left rear HO2S harness connector terminals "C" (Red/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/Black wire between left rear HO2S and main relay. See WIRING DIAGRAMS article. Go to step 9.
6. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
7. Check for continuity between left rear HO2S harness connector terminal "D" (Black/Blue wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Black/Blue wire between left rear HO2S and PCM connector terminal No. 3G. See WIRING DIAGRAMS article. Go to step 9.
8. Check for continuity of Black/Blue wire between left rear HO2S harness connector terminal "D" and PCM harness connector terminal No. 3G. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Black/Blue wire. See WIRING DIAGRAMS article. Go to next step.
9. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0161 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0161 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306 is present, go to step 8 . If any other DTC is present, repair that DTC first. If no DTC is present but a driveability problem is present, go to step 8 . If not DTC is present and no driveability problem is present, go to next step.
3. Check for DTC P0170 in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, repair any other DTC present in FREEZE FRAME DATA first.
4. Using scan tool, access PID data for MAF V, ECT V, TP V and VS. Turn ignition on. Start engine. Compare readings with specifications during engine on and engine running conditions. If all PID data is within specification, go to next step. If any PID data is not within specification, go to applicable component or system test. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Go to step 24 .
5. Referring to FREEZE FRAME DATA, operate vehicle under same conditions as when DTC was set. Record PID data for MAF V, ECT V, TP V and VS. If all PID data is within specification, go to next step. If any PID data is not within specification, go to applicable component or system test. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Go to step 24 .
6. Check for LONGFT1 in FREEZE FRAME DATA. If LONGFT1 is present, go to next step. If LONGFT1 is not present, go to step 19 .
7. Using scan tool, access PID data for FHO2SR. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display right front HO2S voltage greater than .45 volt during acceleration (rich condition) and less than .45 volt during deceleration fuel cut (lean condition). If voltage is as specified, check for vacuum leaks between air cleaner and throttle body, throttle body and plenum chamber, and plenum chamber and intake manifold. If components are okay, check for loose or damaged vacuum hoses. Repair as necessary and go to step 24 . If voltage is not as specified, check for exhaust system leak upstream of right front HO2S. If exhaust system is okay, replace right front HO2S and go to step 24 .
8. Using scan tool, access MAF V PID data. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. If PID data responds quickly to change in engine RPM, go to next step. If PID data does not respond quickly to change in engine RPM, replace MAF sensor and go to step 24 .
9. Check for lose or damaged vacuum hoses. Repair as necessary and go to step 24 . If vacuum hoses are okay, go to next step.
10. Turn ignition off. Check fuel line pressure with engine running. See BASIC DIAGNOSTIC PROCEDURES article. If engine will not start, check fuel line pressure with ignition key in ON position. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 14 . If fuel line pressure is more than 41 psi (2.9 kg/cm 2 ), go to next step. If fuel line pressure is less than 30 psi (2.1 kg/cm 2 ), go to step 12 .
11. Ensure engine is running. Check for vacuum at fuel pressure regulator. If vacuum is present, check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, check fuel return line for plugging. Repair or replace as necessary. If fuel return line is okay, replace pressure regulator and go to step 24 . If vacuum is not present, ensure fuel pressure regulator vacuum hose is okay. Repair or replace as necessary and go to step 24 . If vacuum hose is okay, replace PRC solenoid valve and go to step 24 .
12. Check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is 92-116 psi (6.4-8.2 kg/cm 2 ), go to next step. If fuel pump maximum pressure is not 92-116 psi (6.4-8.2 kg/cm 2 ), check for open fuel pump circuits. Repair as necessary and go to step 24 . If fuel pump circuits are okay, replace fuel pump and go to step 24 .
13. Check for leaks in fuel system downstream of fuel pump. If any leaks are found, repair as necessary and go to step 24 . If no leaks are found, check for plugging at fuel filter and fuel inlet filter (sock). If plugging is present, check fuel tank for debris. If fuel tank is okay, replace fuel filter and go to step 24 . If fuel tank has debris, clean tank, replace fuel inlet filter (sock) and fuel filter. If fuel tank, fuel filter and fuel inlet filter (sock) are okay, replace fuel pressure regulator and go to step 24 .
14. Access and switch fuel injector in suspect cylinder with injector in the opposite bank. Recheck while operating vehicle under conditions similar to when DTC was set. If DTC changes to cylinder where suspect injector is installed, replace injector and go to step 24 . If DTC does not change, go to next step.
15. Check primary and secondary ignition system. If both primary and secondary ignition system are okay, go to step 18 . If secondary ignition system is not operating properly, repair or replace as necessary. If primary ignition system is not operating properly, go to next step.
16. Disconnect suspect ignition coil connector. Turn ignition on. Measure voltage between ground and suspect ignition coil harness connector terminal "A" (Black/White wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire between ignition switch and suspect ignition coil. See WIRING DIAGRAMS article. Go to step 24 .
17. Check ignition coil resistance. See BASIC DIAGNOSTIC PROCEDURES article. If ignition coil is okay, go to next step. If ignition coil is faulty, replace ignition coil and go to step 24 .
18. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to step 24 . If engine compression is not as specified, repair as necessary and go to step 24 .
19. Using scan tool, access PID data for FHO2SR. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display right front HO2S voltage greater than .45 volt during acceleration (rich condition) and less than .45 volt during deceleration fuel cut (lean condition). If voltage is as specified, go to next step. If voltage is not as specified, replace right front HO2S and go to step 24 .
20. Turn ignition off. Check fuel line pressure with engine running. See BASIC DIAGNOSTIC PROCEDURES article. If engine will not start, check fuel line pressure with ignition key in ON position. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 22 . If fuel line pressure is not 30-41 psi (2.1-2.9 kg/cm 2 ), go to next step.
21. Ensure engine is running. Check for vacuum at fuel pressure regulator. If vacuum is present, check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, check fuel return line for plugging. Repair or replace as necessary. If fuel return line is okay, replace pressure regulator and go to step 24 . If vacuum is not present, ensure fuel pressure regulator vacuum hose is okay. Repair or replace as necessary and go to step 24 . If vacuum hose is okay, replace PRC solenoid valve and go to step 24 .
22. Turn ignition off. Disconnect hoses from purge solenoid valve. Apply low-pressure air through purge solenoid valve. If air flows through, replace purge solenoid valve and go to step 24 . If air does not flow through, go to next step.
23. Check PCV system. If PCV system is okay, go to next step. If a problem is found, repair as necessary and go to next step.
24. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, perform PCM adaptive memory drive mode, EGR monitor repair verification drive mode and HO2S/TWC monitor repair verification drive mode. See «DRIVE MODES»(ref-11774-S12820596512001040500000) . Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0170 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0170 is not present, go to next step.
25. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306 is present, go to step 8 . If any other DTC is present, repair that DTC first. If no DTC is present but a driveability problem is present, go to step 8 . If no DTC is present and no driveability problem is present, go to next step.
3. Check for DTC P0173 in FREEZE FRAME DATA. If DTC is present, go to next step. If DTC is not present, repair any other DTC present in FREEZE FRAME DATA first.
4. Using scan tool, access PID data for MAF V, ECT V, TP V and VS. Turn ignition on. Start engine. Compare readings with specifications during engine on and engine running condition. If all PID data is within specification, go to next step. If any PID data is not within specification, go to applicable component or system test. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Go to step 24 .
5. Referring to FREEZE FRAME DATA, operate vehicle under same conditions as when DTC was set. Record PID data for MAF V, ECT V, TP V and VS. If all PID data is within specification, go to next step. If any PID data is not within specification, go to applicable component or system test. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Go to step 24 .
6. Check for LONGFT2 in FREEZE FRAME DATA. If LONGFT2 is present, go to next step. If LONGFT2 is not present, go to step 19 .
7. Using scan tool, access PID data for FHO2SL. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display left front HO2S voltage greater than .45 volt during acceleration (rich condition) and less than .45 volt during deceleration fuel cut (lean condition). If voltage is as specified, check for vacuum leaks between air cleaner and throttle body, throttle body and plenum chamber, and plenum chamber and intake manifold. If components are okay, check for loose or damaged vacuum hoses. Repair as necessary and go to step 24 . If voltage is not as specified, check for exhaust system leak upstream of left front HO2S. If exhaust system is okay, replace left front HO2S and go to step 24 .
8. Using scan tool, access MAF V PID data. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. If PID data responds quickly to change in engine RPM, go to next step. If PID data does not respond quickly to change in engine RPM, replace MAF sensor and go to step 24 .
9. Check for loose or damaged vacuum hoses. Repair as necessary and go to step 24 . If vacuum hoses are okay, go to next step.
10. Turn ignition off. Check fuel line pressure with engine running. See BASIC DIAGNOSTIC PROCEDURES article. If engine will not start, check fuel line pressure with ignition key in ON position. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 14 . If fuel line pressure is more than 41 psi (2.9 kg/cm 2 ), go to next step. If fuel line pressure is less than 30 psi (2.1 kg/cm 2 ), go to step 12 .
11. Ensure engine is running. Check for vacuum at fuel pressure regulator. If vacuum is present, check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, check fuel return line for plugging. Repair or replace as necessary. If fuel return line is okay, replace pressure regulator and go to step 24 . If vacuum is not present, ensure fuel pressure regulator vacuum hose is okay. Repair or replace as necessary and go to step 24 . If vacuum hose is okay, replace PRC solenoid valve and go to step 24 .
12. Check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is 92-116 psi (6.4-8.2 kg/cm 2 ), go to next step. If fuel pump maximum pressure is not 92-116 psi (6.4-8.2 kg/cm 2 ), check for open fuel pump circuits. Repair as necessary and go to step 24 . If fuel pump circuits are okay, replace fuel pump and go to step 24 .
13. Check for leaks in fuel system downstream of fuel pump. If any leaks are found, repair as necessary and go to step 24 . If no leaks are found, check for plugging at fuel filter and fuel inlet filter (sock). If plugging is present, check fuel tank for debris. If fuel tank is okay, replace fuel filter and go to step 24 . If fuel tank has debris, clean tank, replace fuel inlet filter (sock) and fuel filter. If fuel tank, fuel filter and fuel inlet filter (sock) are okay, replace fuel pressure regulator and go to step 24 .
14. Access and switch fuel injector in suspect cylinder with injector in the apposite bank. Recheck while operating vehicle under conditions similar to when DTC was set. If DTC changes to cylinder where suspect injector is installed, replace injector and go to step 24 . If DTC does not change, go to next step.
15. Check primary and secondary ignition system. If both primary and secondary ignition system are okay, go to step 18 . If secondary ignition system is not operating properly, repair or replace as necessary. If primary ignition system is not operating properly, go to next step.
16. Disconnect suspect ignition coil connector. Turn ignition on. Measure voltage between ground and suspect ignition coil harness connector terminal "A" (Black/White wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire between ignition switch and suspect ignition coil. See WIRING DIAGRAMS article. Go to step 24 .
17. Check ignition coil resistance. See BASIC DIAGNOSTIC PROCEDURES article. If ignition coil is okay, go to step 24 . If ignition coil is faulty, replace ignition coil and go to step 24 .
18. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to step 24 . If engine compression is not as specified, repair as necessary and go to step 24 .
19. Using scan tool, access PID data for FHO2SL. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display left front HO2S voltage greater than .45 volt during acceleration (rich condition) and less than .45 volt during deceleration fuel cut (lean condition). If voltage is as specified, go to next step. If voltage is not as specified, replace left front HO2S and go to step 24 .
20. Turn ignition off. Check fuel line pressure with engine running. See BASIC DIAGNOSTIC PROCEDURES article. If engine will not start, check fuel line pressure with ignition key in ON position. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 22 . If fuel line pressure is not 30-41 psi (2.1-2.9 kg/cm 2 ), go to next step.
21. Ensure engine is running. Check for vacuum at fuel pressure regulator. If vacuum is present, check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, check fuel return line for plugging. Repair or replace as necessary. If fuel return line is okay, replace pressure regulator and go to step 24 . If vacuum is not present, ensure fuel pressure regulator vacuum hose is okay. Repair or replace as necessary and go to step 24 . If vacuum hose is okay, replace PRC solenoid valve and go to step 24 .
22. Turn ignition off. Disconnect hoses from purge solenoid valve. Apply low-pressure air through purge solenoid valve. If air flows through, replace purge solenoid valve and go to step 24 . If air does not flow through, go to next step.
23. Check PCV system. If PCV system is okay, go to next step. If a problem is found, repair as necessary and go to next step.
24. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, perform PCM adaptive memory drive mode, EGR monitor repair verification drive mode and HO2S/TWC monitor repair verification drive mode. See «DRIVE MODES»(ref-11774-S12820596512001040500000) . Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0173 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0173 is not present, go to next step.
25. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, repair that DTC first. If no other DTC is present, go to next step.
3. Start engine. If engine does not start, turn ignition on. Using scan tool, access PID data for BRKSW, ECT V, IAT V, MAF V, RPM, TP V and VS. If any PID data is not within specification, go to appropriate component or system test. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Go to step 21 . If all PID data is within specification, go to next step.
4. Referring to FREEZE FRAME DATA, operate vehicle under same conditions as when DTC was set. Using scan tool, access PID data for BRKSW, ECT V, IAT V, MAF V, RPM, TP V and VS. If any PID data is not within specification, go to appropriate component or system test. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Go to step 21 . If all PID data is within specification, go to next step.
5. Check CMP sensor operation. See BASIC DIAGNOSTIC PROCEDURES article. If CMP sensor is operating appropriately, go to next step. If CMP sensor is not operating appropriately, ensure CMP sensor is installed correctly, and timing belt and gears are not damaged. If no problem is found, replace CMP sensor and go to step 21 .
6. Check CKP sensor installation. See BASIC DIAGNOSTIC PROCEDURES article. Repair as necessary and go to step 21 . If sensor is tight, go to next step.
7. Check primary and secondary ignition system. See BASIC DIAGNOSTIC PROCEDURES article. If both primary and secondary ignition system are okay, go to step 10 . If secondary ignition system is not operating properly, repair or replace as necessary. If primary ignition system is not operating properly, go to next step.
8. Disconnect suspect ignition coil connector. Turn ignition on. Measure voltage between ground and suspect ignition coil harness connector terminal "A" (Black/White wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire between ignition switch and suspect ignition coil. See WIRING DIAGRAMS article. Go to step 21 .
9. Check ignition coil resistance. See BASIC DIAGNOSTIC PROCEDURES article. If ignition coil is okay, go to step 21 . If ignition coil is faulty, replace ignition coil and go to step 21 .
10. Using scan tool, access MAF V PID data. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. If PID data responds quickly to change in engine RPM, go to next step. If PID data does not respond quickly to change in engine RPM, replace MAF sensor and go to step 21 .
11. Check for vacuum leaks between MAF sensor and throttle body. Also check for vacuum leaks at throttle body and plenum chamber. Repair or replace as necessary and go to step 21 . If no problem is found, go to next step.
12. Check fuel line pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is okay, go to step 16 . If fuel line pressure is low, go to step 14 . If fuel line pressure is high, go to next step.
13. Ensure engine is running. Check for vacuum at fuel pressure regulator. If vacuum is present, check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, check fuel return line for plugging. Repair or replace as necessary. If fuel return line is okay, replace pressure regulator and go to step 21 . If vacuum is not present, ensure fuel pressure regulator vacuum hose is okay. Repair or replace as necessary. If vacuum hose is okay, replace PRC solenoid valve and go to step 21 .
14. Check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If maximum pressure is less than 92 psi (6.4 kg/cm 2 ), go to next step. If maximum pressure is 92 psi (6.4 kg/cm 2 ) or more, check for open fuel pump circuits. Repair as necessary and go to step 21 . If fuel pump circuits are okay, replace fuel pump and go to step 21 .
15. Check for leaks in fuel system downstream of fuel pump. If any leaks are found, repair as necessary and go to step 21 . If no leaks are found, check for plugging at fuel filter and fuel inlet filter (sock). If plugging is present, check fuel tank for debris. If fuel tank is okay, replace fuel filter and go to step 21 . If fuel tank has debris, clean tank, replace fuel inlet filter (sock) and fuel filter. If fuel tank, fuel filter and fuel inlet filter (sock) are okay, replace fuel pressure regulator and go to step 21 .
16. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to next step. If engine compression is not as specified, repair as necessary and go to step 21 .
17. Turn ignition off. Disconnect vacuum hoses from purge solenoid valve. Using vacuum pump, apply vacuum to purge solenoid valve. Purge solenoid valve should hold vacuum. Turn ignition on. Using scan tool, select SIMULATION TEST and PRGV PID data. Set PRGV PID data duty cycle to 100 percent to turn on purge solenoid valve. Purge solenoid valve should turn on and release vacuum. If purge solenoid valve operates as specified, go to next step. If purge solenoid valve does not operate as specified, replace purge solenoid valve and go to step 21 .
18. Check PCV system. If PCV system is okay, go to next step. If a problem is found, repair as necessary and go to step 21 .
19. Remove EGR valve and check if EGR valve is stuck open. Repair or replace EGR valve as necessary and go to step 21 . If EGR valve is okay, go to next step.
20. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak and go to next step.
21. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, perform PCM adaptive memory drive mode. See «PCM ADAPTIVE MEMORY DRIVE MODE»(ref-11774-S36254338772001040500000) under DRIVE MODES. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0300 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0300 is not present, go to next step.
22. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, repair that DTC first. If no other DTC is present, go to next step.
3. Start engine. If engine does not start, turn ignition on. Using scan tool, access PID data for BRKSW, ECT V, IAT V, MAF V, RPM, TP V and VS. If any PID data is not within specification, go to appropriate component or system test. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Go to step 12 . If all PID data is within specification, go to next step.
4. Referring to FREEZE FRAME DATA, operate vehicle under same conditions as when DTC was set. Using scan tool, access PID data for BRKSW, ECT V, IAT V, MAF V, RPM, TP V and VS. If any PID data is not within specification, go to appropriate component or system test. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Go to step 12 . If all PID data is within specification, go to next step.
5. Turn ignition off. Check suspect spark plug condition. If spark plug is okay, go to next step. If plug is wet, go to step 11 . If spark plug is worn or damaged, replace as necessary and go to step 12 .
6. Check secondary ignition system. See BASIC DIAGNOSTIC PROCEDURES article. Repair or replace as necessary and go to step 12 . If secondary ignition system is okay, go to next step.
7. Check for vacuum leaks between plenum chamber and intake manifold, and between intake manifold and cylinder head. Repair or replace as necessary and go to step 12 . If no problem is found, go to next step.
8. Remove air inlet components as necessary to access and disconnect suspect cylinder fuel injector harness connector. Connect Noid light to suspect injector harness connector. Check Noid light while cranking engine. If Noid light illuminates, go to next step. If Noid light does not illuminate, diagnose and repair suspect fuel injector wiring harness and go to step 12 .
9. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak and go to step 12 .
10. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to next step. If engine compression is not as specified, repair as necessary and go to step 12 .
11. Access and switch fuel injector in suspect cylinder with injector in the apposite bank. Recheck while operating vehicle under conditions similar to when DTC was set. If DTC changes to cylinder where suspect injector is installed, replace injector and go to next step. If DTC does not change, go to next step.
12. Reconnect all connectors. Start engine. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, perform PCM adaptive memory drive mode. See «PCM ADAPTIVE MEMORY DRIVE MODE»(ref-11774-S36254338772001040500000) under DRIVE MODES. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0301-306 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0301-306 is not present, go to next step.
13. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off. Disconnect KS connector. Turn ignition on. Measure voltage between KS harness connector terminal and ground. If about 5 volts is present go to step 7 . If about 5 volts in not present, go to next step.
3. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 8 . If connector terminals are okay, go to next step.
4. Check for continuity between KS harness connector terminal and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in White wire between KS and PCM connector terminal No. 3S. See WIRING DIAGRAMS article. Go to step 8 .
5. Check for continuity of White wire between KS harness connector terminal and PCM harness connector terminal 3S. If continuity is present, go to next step. If continuity is not present, repair open in White wire. See WIRING DIAGRAMS article. Go to next step.
6. Turn ignition on. Measure voltage between KS harness connector terminal and ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in White wire between KS and PCM connector terminal No. 3S. See WIRING DIAGRAMS article. Go to step 8 .
7. Turn ignition off. Measure resistance between KS terminal and sensor body. If resistance is 560 ohms, go to next step. If resistance is not 560 k/ohms, replace KS and go to next step.
8. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0325 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0325 is not present, go to next step.
9. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Disconnect in-line, Gray, 12-pin connector X20. (Scheme 22) Measure AC voltage between female side of in-line, Gray, 12-pin connector X20 terminal "C" and "D" while cranking engine. (Scheme 21) If voltage is present, go to step 9. If voltage is not present, go to next step.
3. Turn ignition off. Measure resistance between female side of in-line, Gray, 12-pin connector X20 terminal "C" and "D". (Scheme 21) If resistance is 950-1250 ohms, check crankshaft pulley for damage. Replace as necessary and go to step 13. If no resistance is present, go to next step. If resistance reading is infinite, go to step 6.
4. Disconnect CKP sensor connector. Check for continuity between female side of in-line, Gray, 12-pin connector X20 terminal "C" (Green wire) and ground. Also check for continuity between female side of in-line, Gray, 12-pin connector X20 terminal "D" (Red wire) and ground. If continuity is not present in both wires, go to next step. If continuity is present in either wire, repair short to ground in suspect wire. See WIRING DIAGRAMS article. Go to step 13.
5. Check for continuity between female side of in-line, Gray, 12-pin connector X20 terminal "C" (Green wire) and "D" (Red wire). If continuity is not present, go to step 8. If continuity is present, repair short between circuits. Go to step 13.
6. Disconnect CKP sensor connector. Check for damaged or corroded CKP sensor connector terminals. Repair as necessary and go to step 13. If connector terminals are okay, go to next step.
7. Check for continuity of Green wire between CKP sensor harness connector terminal "A" and female side of in-line, Gray, 12-pin connector X20 terminal "C". Also check for continuity of Red wire between CKP sensor harness connector terminal "B" and female side of in-line, Gray, 12-pin connector X20 terminal "D". If continuity is present in both wires, go to next step. If continuity is not present in either wire, repair open in suspect wire. See WIRING DIAGRAMS article. Go to step 13.
8. Measure resistance between CKP sensor connector terminals. If resistance is 950-1250 ohms, check for damaged or corroded CKP sensor connector terminals. Repair as necessary and go to step 13. If no resistance is present, replace CKP sensor and go to step 13.
9. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 13. If connector terminals are okay, go to next step.
10. Check for continuity of Green wire between PCM harness connector terminal No. 4AH and male side of in-line, Gray, 12-pin connector X20 terminal "C". (Scheme 35) Also check for continuity of Red wire between PCM harness connector terminal No. 4AL and male side of in-line, Gray, 12-pin connector X20 terminal "D". If continuity is present in both wires, go to next step. If continuity is not present in either wire, repair open in suspect wire. See WIRING DIAGRAMS article. Go to step 13.
11. Check for continuity between male side of in-line, Gray, 12-pin connector X20 terminal "C" (Green wire) and ground. Also check for continuity between male side of in-line, Gray, 12-pin connector X20 terminal "D" (Red wire) and ground. If continuity is not present in both wires, go to next step. If continuity is present in either wire, repair short to ground in suspect wire. See WIRING DIAGRAMS article. Go to step 13.
12. Check for continuity between male side of in-line, Gray, 12-pin connector X20 terminal "C" (Green wire) and "D" (Red wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits and go to next step.
13. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0335 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0335 is not present, go to next step.
14. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 21

Scheme 22

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, repair that DTC first. If no other DTC is present, go to next step.
3. Check for plugged, damaged, frozen or leaking vacuum hose. Repair as necessary and go to step 9. If vacuum hoses are okay, go to next step.
4. Start engine and allow it to idle. Disconnect EGR valve vacuum hose. Apply vacuum to EGR valve. If engine runs roughly or stalls, go to next step. If engine does not run roughly or stall, replace EGR valve and go to step 9.
5. Turn ignition off and on. Using scan tool, access MAP V PID data. Disconnect MAP sensor vacuum hose. (Scheme 22) Using a vacuum pump, apply vacuum to MAP sensor. If PID data decreases, go to next step. If PID data does not decrease, replace MAP sensor and go to step 9.
6. Start engine. Disconnect MAP sensor vacuum hose. Using scan tool, activate MAP V OFF. Connect vacuum gage to MAP sensor vacuum hose. If vacuum is present for 3 seconds when MAP V OFF is activated, replace MAP sensor solenoid valve, and go to step 9. If vacuum is not present for 3 seconds when MAP V OFF is activated, go to next step.
7. Remove EGR valve. Ensure EGR valve passages are not restricted and EGR gasket is installed correctly. Repair as necessary and go to step 9. If passages and gasket are okay, go to next step.
8. Inspect EGR valve gasket for damage. Replace as necessary and go to next step. If EGR gasket is okay, go to next step.
9. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, perform PCM adaptive memory drive mode. See «PCM ADAPTIVE MEMORY DRIVE MODE»(ref-11774-S36254338772001040500000) under DRIVE MODES. Using scan tool, access RFC FLAG PID data. If PID data in on, go to next step. If PID data is off, repeat this step.
10. Using scan tool, perform EGR monitor repair verification drive mode. See «EGR MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S29052003052001040500000) under DRIVE MODES. Access ON BOARD SYSTEM READINESS TEST menu of GENERIC OBD II FUNCTION and check DRIVE MODE completion status. If EGR system monitor is complete, go to next step. If EGR system monitor is not complete, repeat this step.
11. Reconnect all connectors. Using scan tool, check DIAGNOSTIC MONITORING TEST RESULTS. If TEST No. 10:41:00 is within specification, go to next step. If TEST No. 10:41:00 is out of specification, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
12. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Check for disconnected, damaged or misrouted vacuum hoses between intake manifold and EGR vacuum solenoid valve, EGR vacuum solenoid valve and EGR vent solenoid valve, EGR vent solenoid valve and air cleaner, and between EGR vent solenoid valve and EGR valve. Repair as necessary and go to step 7 . If vacuum hoses are okay, go to next step.
3. Turn ignition on. Using scan tool, activate EGRVAC and EGRVENT. If a click sound is heard from EGR vacuum solenoid valve and EGR vent solenoid valve, go to next step. If a click sound is not heard from EGR vacuum solenoid valve or EGR vent solenoid valve, check for open or short to ground in suspect solenoid valve circuit. See WIRING DIAGRAMS article. Repair as necessary. Go to step 7 . If circuits are okay, go to next step.
4. Inspect EGR vacuum solenoid valve. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as needed and go to step 7 . If EGR vacuum solenoid valve is okay, go to next step.
5. Inspect EGR vent solenoid valve. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as needed and go to step 7 . If EGR vent solenoid valve is okay, go to next step.
6. Turn ignition off. Remove EGR valve. Inspect EGR valve. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as needed and go to next step. If EGR solenoid valve is okay, go to next step.
7. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, perform PCM adaptive memory drive mode. See «PCM ADAPTIVE MEMORY DRIVE MODE»(ref-11774-S36254338772001040500000) under DRIVE MODES. Using scan tool, access RFC FLAG PID data. If PID data in on, go to next step. If PID data is not on, repeat this step.
8. Using scan tool, perform EGR monitor repair verification drive mode. See «EGR MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S29052003052001040500000) under DRIVE MODES. Access ON BOARD SYSTEM READINESS TEST menu of GENERIC OBD II FUNCTION and check DRIVE MODE completion status. If EGR system monitor is complete, go to next step. If EGR system monitor is not complete, repeat this step.
9. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0404 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0404 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, repair that DTC first. If no other DTC is present, go to next step.
3. Check for exhaust system leaks. Repair as necessary and go to step 7. If exhaust system is okay, go to next step.
4. Check suspect HO2S installation. If HO2S is loose, retighten sensor and go to step 7. If HO2S is not loose, go to next step.
5. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000). Ensure no HO2S related DTCs are set. If HO2S DTCs are set repair those DTCs first and go to next step.
6. Using scan tool, access PID data for FHO2S L (left front HO2S) and RHO2S L (left rear HO2S), or FHO2S R (right front HO2S) and RHO2S R (right rear HO2S). Press START. Drive vehicle at 40-60 MPH for 10 minutes. Park vehicle with engine running. Press TRIGGER. Wait one minute and press TRIGGER again. Access appropriate PIDs and read VIEW RECORDING graph. (Scheme 23) Count inversions (number of times that suspect side of front and rear HO2S graph line crosses 5 volt line). Calculate inversion ratio of front and rear HO2S by dividing front HO2S inversions by rear HO2S inversions. If inversion ratio is 2 or more, catalyst is okay. Go to next step. If inversion ratio is less than 2, catalyst is not functioning properly. Replace catalyst and go to next step.
7. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, perform PCM adaptive memory drive mode, EGR monitor repair verification drive mode and HO2S/TWC monitor repair verification drive mode. See «DRIVE MODES»(ref-11774-S12820596512001040500000). Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0421 or P0431 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0421 or P0431 is not present, go to next step.
8. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 23

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTCs P0443 or P1449 are present, diagnose and repair these DTCs first. See «DTC P0443: EVAP CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT MALFUNCTION»(ref-11774-S26209599472000112700000) or «DTC P1449: CANISTER DRAIN CUT VALVE (CDCV) CIRCUIT MALFUNCTION»(ref-11774-S33751270012000112700000). If DTCs P0443 and P1449 are not present, go to next step.
3. Connect scan tool. Perform evaporative emission control system inspection. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If system fails test, go to next step. If system passes (no leaks), problem is intermittent. See TROUBLE SHOOTING - NO CODES article. Check purge solenoid valve and CDCV wiring circuit. Repair or replace as necessary.
4. Inspect fuel filler cap. Ensure fuel filler cap is secure and not leaking. If fuel filler cap is not leaking, ensure fuel filler cap is not an after-market brand (non-OEM). Replace with factory cap if necessary and go to step 18. If fuel filler cap is okay, go to next step.
5. Using scan tool, perform complete EVAP system inspection. Follow scan tool manufacturer's instructions. If system passes (holds vacuum for 2 minutes or more), go to step 18. If system fails, and EVAP system tester is not available, go to next step. If system fails, and EVAP system tester is available, go to step 17.
6. Using scan tool, perform EVAP control system inspection from charcoal canister to fuel tank. Follow scan tool manufacturer's instructions. If system leaks, go to next step. If system passes (holds vacuum for 2 minutes or more), go to step 12.
7. Remove and inspect fuel tank and fuel gauge sending unit for leakage or damage. If fuel tank and fuel gauge sending unit are okay, go to next step. If a problem is found, repair or replace as necessary and go to step 18.
8. Inspect rollover valve following way: Disconnect negative battery cable. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE in REMOVAL, OVERHAUL & INSTALLATION article. Remove rear seat cushion. Empty fuel tank. Disconnect fuel hoses and electrical connector. See FUEL LINE CONNECTORS in REMOVAL, OVERHAUL & INSTALLATION article. Remove fuel tank and place it right-side up on a level surface. Go to next step.
9. Plug all except rollover valve ports. (Scheme 24) Apply low-pressure air to one rollover valve port and ensure there is airflow from remaining 2 rollover valve ports. Repeat testing procedure for all 3 rollover valves. Air flow should be present at all rollover valve ports. If air flow is not present at any port, replace fuel tank. Go to step 18. If air flow is present at all rollover valve ports, go to next step.
10. Turn fuel tank upside-down and repeat testing procedure, from previous step, for all 3 rollover valves. Air flow should not be present at any rollover valve port. If air flow is present at any rollover valve port, replace fuel tank. Go to step 18. If air flow is not present at any rollover valve port, go to next step.
11. Remove and check pressure control valve operation. Replace as necessary and go to step 18. If pressure control valve is okay, check damaged or incorrectly installed vacuum hoses located between charcoal canister and pressure control valve, pressure control valve and fuel tank, fuel-filler pipe and pressure control valve, and fuel tank pressure sensor and pressure control valve. Go to step 18.
12. Check for loose and improperly connected vacuum hoses between charcoal canister and purge solenoid valve. Disconnect vacuum hoses between charcoal canister and purge solenoid valve from charcoal canister. Apply vacuum to hose for 2 minutes. If vacuum is held for 2 minutes or more, go to step 18. If vacuum is not held for 2 minuets or more, go to next step.
13. Remove catch tank and check for plugging or damage. Using vacuum pump, check for catch tank leakage. Replace as necessary and go to step 18. If catch tank is okay, go to next step.
14. Remove purge solenoid valve and inspect purge solenoid valve for damage or leakage. Replace as necessary and go step 18. If purge solenoid valve is okay, go to next step.
15. Remove charcoal canister and inspect charcoal canister for damage or leakage. Charcoal canister is located near fuel tank. Replace as necessary and go step 18. If charcoal canister is okay, go to next step.
16. Remove CDCV and inspect CDCV for damage or leakage. Replace as necessary and go step 18. If CDCV is okay, check for damaged or improperly connected vacuum hoses between charcoal canister and CDCV. Repair as necessary and go to step 18.
17. Using evaporative emission tester, inspect evaporative control system for leakage. Repair as necessary and go to next step. If no leaks are found, go to next step.
18. Turn ignition on. Ensure fuel gauge indicates that fuel tank is 15-85 present full. Using scan tool, access PID data for BARO, ECT and IAT. Ensure PID data for BARO is 21.3 in Hg or more, ECT is 14-90.5°F (-10-32.5°C) and IAT is 14-140°F (-10-60°C). If any signal is no as specified, go to step 21. If all signals are as specified, go to next step.
19. Check evaporative system for leakage. If a leak is present, go to next step. If no leaks are found, go to step 24.
20. Turn ignition on. Ensure fuel gauge indicates that fuel tank is 15-85 present full. Using scan tool, access PID data for BARO, ECT, IAT and FTL V. Ensure PID data for BARO is 21.3 in Hg or more, ECT is 14-90.5°F (-10-32.5°C), IAT is 14-140°F (-10-60°C) and FTL V is 1.25-3.75 volts. If any signals are not within specification, allow engine to cool down and repeat this step. If all signals are within specification, go to next step.
21. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Ensure that EVAP Monitor Repair Verification Drive Mode can be performed. See «EVAP MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S11451666752001040500000) under DRIVE MODES. If EVAP Monitor Repair Verification Drive Mode can be performed, go to next step. If EVAP monitor repair verification drive mode cannot be performed because vehicle cannot be driven under conditions specified for this test, perform evaporative system test procedure as an alternative. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If evaporative system test procedure indicates that system result are okay, go to step 24. If evaporative system test procedure indicate that system result are not okay, replace PCM and go to step 24. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
22. Perform EVAP monitor repair verification drive mode. See «EVAP MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S11451666752001040500000) under DRIVE MODES. Access ON BOARD SYSTEM READINESS TEST menu of GENERIC OBD II FUNCTION and check DRIVE MODE completion status. If evaporative purge system monitor is complete, go to next step. If evaporative purge system monitor is not complete, repeat step 20.
23. Using scan tool, verify TEST #10:21:00 in DIAGNOSTIC MONITORING TEST RESULTS. If test is less than MAX value, go to next step. If test result is at MAX value or more, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
24. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 24

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0443 is present, go to next step. If DTC P0443 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Disconnect purge solenoid valve vacuum line. Using vacuum pump, apply vacuum to purge solenoid valve for a few seconds. If vacuum holds, go to step 5. If vacuum does not hold, go to next step.
4. Disconnect purge solenoid valve harness connector. Apply vacuum to purge solenoid valve for a few seconds. If vacuum holds, repair short in White/Black wire between purge solenoid valve and PCM connector terminal No. 4O. See WIRING DIAGRAMS article. Go to step 10. If vacuum does not hold, replace purge solenoid valve and go to step 10.
5. Turn ignition off. Disconnect purge solenoid valve connector. Check for damaged or corroded purge solenoid valve connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
6. Measure resistance between purge solenoid valve terminals. If resistance is 30-34 ohms, go to next step. If resistance is not 30-34 ohms, replace purge solenoid valve and go to step 10.
7. Turn ignition on. Measure voltage between ground and purge solenoid valve harness connector terminal "A" (Red/Black wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/Black wire between purge solenoid valve and main relay. See WIRING DIAGRAMS article. Go to step 10.
8. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
9. Reconnect purge solenoid valve harness connector. Measure voltage between ground and PCM harness connector terminal No. 4O (White/Black wire). (Scheme 35) If battery voltage is present, go to next step. If battery voltage is not present, repair open in White/Black wire between PCM and purge solenoid valve. See WIRING DIAGRAMS article. Go to next step.
10. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0443 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0443 is not present, go to next step.
11. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Using scan tool, access PID data for FTP V. If PID data is less.2 volt, go to next step. If PID data is more than 4.8 volts, go to step 8. If PID data is.2-4.8 volts, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Disconnect FTP sensor connector. Turn ignition on. If PID data is more than 4.8 volts, go to next step. If PID data is 4.8 volts or less, go to step 6.
4. Measure voltage between ground and FTP sensor harness connector terminal "C" (Light Green/Red wire). If 4.5-5.5 volts are not present, go to next step. If 4.5-5.5 volts are present, check FTP sensor harness connector for loose or damaged terminals, poor contact or corrosion. Clean or repair as necessary. If no problem is found, replace FTP sensor and go to step 17.
5. Turn ignition off. Disconnect in-line 3-pin connector (B2-34). In-line 3-pin connector is located near charcoal canister. (Scheme 25) Measure voltage between ground and male side of in-line 3-pin connector terminal "B" (Light Green/Red wire). If 4.5-5.5 volts are present, repair open in Light Green/Red wire between female side of in-line 3-pin connector and FTP sensor connector. See WIRING DIAGRAMS article. Go to step 17. If 4.5-5.5 volts are not present, repair open in Light Green/Red wire between male side of in-line 3-pin connector and PCM connector terminal No. 3A. See WIRING DIAGRAMS article. Go to step 17.
6. Turn ignition off. Disconnect in-line 3-pin connector (B2-34). In-line 3-pin connector is located near charcoal canister. (Scheme 25) Check for continuity between female side of in-line 3-pin connector terminal "A" (Light Green wire) and ground. If continuity is present, repair short to ground in Light Green wire between female side of in-line 3-pin connector and FTP sensor connector. See WIRING DIAGRAMS article. Go to step 8. If continuity is not present, go to next step.
7. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for continuity between male side of in-line 3-pin connector terminal "A" (Light Green wire) and ground. If continuity is present, repair short to ground in Light Green wire between male side of in-line 3-pin connector and PCM connector. See WIRING DIAGRAMS article. Go to step 17. If continuity is not present, check for short between circuits in FTP sensor harness. Repair as necessary and go to step 17.
8. Check for damaged or corroded FTP sensor connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to next step.
9. Turn ignition off. Check for continuity between FTP sensor harness connector terminal "B" (Black/Yellow wire) and ground. If continuity is present, go to step 11. If continuity is not present, go to next step.
10. Disconnect in-line 3-pin connector (B2-34). In-line 3-pin connector is located near charcoal canister. Check for continuity between male side of in-line 3-pin connector terminal "C" (Black/Yellow wire) and ground. If continuity is present, repair open in Black/Yellow wire between female side of in-line 3-pin connector and FTP sensor connector. See WIRING DIAGRAMS article. Go to step 17. If continuity is not present, repair open in Black/Yellow wire between male side of in-line 3-pin connector and PCM connector terminal No. 3AB. See WIRING DIAGRAMS article. Go to step 17.
11. Ensure in-line 3-pin connector (B2-34) is disconnected. In-line 3-pin connector is located near charcoal canister. Check for damaged or corroded in-line 3-pin connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to next step.
12. Check for continuity between female side of in-line 3-pin connector terminals "A" (Light Green wire) and "B" (Light Green/Red wire). If continuity is present, repair short between wires in harness and go to step 17. If continuity is not present, go to next step.
13. Check for continuity of Light Green wire between FTP sensor harness connector terminal "A" and female side of in-line 3-pin connector terminal "A". If continuity is present, go to next step. If continuity is not present, repair open in Light Green wire between FTP sensor and female side of in-line 3-pin connector. See WIRING DIAGRAMS article. Go to step 17.
14. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to next step.
15. Check for continuity between male side of in-line 3-pin connector terminals "A" (Light Green wire) and "B" (Light Green/Red wire). If continuity is present, repair short between wires in harness and go to step 17. If continuity is not present, go to next step.
16. Check for continuity of Light Green wire between PCM harness connector terminal No. 3F and male side of in-line 3-pin connector terminal "A". (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Light Green wire between PCM and male side of in-line 3-pin connector. See WIRING DIAGRAMS article. Go to next step.
17. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, access PID data for FTP V and ECT. FTP V PID data should be 0.2-4.8 volts and ECT PID data should be less than 176°F (80°C). Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0450 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0450 is not present, go to next step.
18. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 25

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0443 or P1449 is present, go to appropriate DTC test. See «DTC P0443: EVAP CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT MALFUNCTION»(ref-11774-S26209599472000112700000) or «DTC P1449: CANISTER DRAIN CUT VALVE (CDCV) CIRCUIT MALFUNCTION»(ref-11774-S33751270012000112700000) . If DTC P0443 and P1449 are not present, go to next step.
3. Turn ignition off. Disconnect purge solenoid valve vacuum hoses. Using vacuum pump, apply vacuum to lower purge solenoid valve vacuum port. Turn ignition on. Using scan tool, activate PRGV PID data to 50 percent duty cycle. If vacuum is released, go to next step. If vacuum is not released, replace purge solenoid valve and go to step 7 .
4. Disconnect CDCV hoses. Using vacuum pump, apply vacuum to CDCV. Using scan tool, turn on CDCV. If vacuum holds for 3 seconds, go to next step. If vacuum does not hold for 3 seconds, replace CDCV and go to step 7 .
5. Remove charcoal canister and check for plugging. Charcoal canister is located near fuel tank. If charcoal canister is okay, go to next step. If charcoal canister is not okay, replace charcoal canister and go to step 7 .
6. Check fuel tank pressure sensor operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as needed and go to next step. If fuel tank pressure sensor is okay, go to next step.
7. Turn ignition on. Using scan tool, monitor PID data for BARO, ECT, IAT and FTL V. PID data should read BARO is 21.3 in. Hg or more, ECT is 14-90.5° F (-10-32.5°C), IAT is 14-140°F (-10-60°C) and FTL V is 1.25-3.75 volts. If any signals are not within specification, allow engine to cool down and repeat this step. If all signals are within specification, go to next step.
8. Reconnect all connectors. Perform EVAP monitor repair verification drive mode. See «EVAP MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S11451666752001040500000) under DRIVE MODES. Access ON BOARD SYSTEM READINESS TEST menu of GENERIC OBD II FUNCTION and check DRIVE MODE completion status. If evaporative purge system monitor is complete, go to next step. If evaporative purge system monitor is not complete, repeat step 7 .
9. Turn ignition on. Using scan tool, ensure FTP V PID data is .2-4.8 volts. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0451 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0451 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTCs P0443 or P1449 are present, diagnose and repair these DTCs first. See «DTC P0443: EVAP CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT MALFUNCTION»(ref-11774-S26209599472000112700000) or «DTC P1449: CANISTER DRAIN CUT VALVE (CDCV) CIRCUIT MALFUNCTION»(ref-11774-S33751270012000112700000). If DTCs P0443 and P1449 are not present, go to next step.
3. Inspect fuel filler cap. Ensure filler cap is secure and not leaking. If cap is an after-market brand (non-OEM), replace with factory brand cap and go to step 30. If cap is okay, go to next step.
4. Turn ignition on. Using scan tool, select SIMULATION TEST. Set PRGV PID data duty cycle to 50 percent. If purge solenoid valve is heard operating, go to next step. Purge solenoid valve is located at rear center of engine compartment. If purge solenoid valve is not heard operating, replace purge solenoid valve and go to step 30.
5. Using scan tool, select SIMULATION TEST. Activate CDCV PID. If CDCV is heard operating, go to next step. CDCV is located at leaf rear for vehicle. (Scheme 26) If CDCV does not operate, replace CDCV and go to step 30.
6. Perform evaporative system test. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If system is not okay, go to next step. If system is okay, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
7. Perform evaporative emission control system inspection. Follow scan tool manufacturer's instructions. If system leaks, check EVAP control system for leakage using evaporative emission tester. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Repair or replace as necessary and go to step 30. If system passes, go to next step.
8. Review steps necessary to perform EVAP monitor repair verification drive mode. See «EVAP MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S11451666752001040500000) under DRIVE MODES. If EVAP monitor repair verification drive mode is possible to perform, go to next step. If EVAP monitor repair verification drive mode is not possible to perform, go to step 17.
9. Turn ignition on. Using scan tool, monitor PID data for BARO, ECT, IAT and FTL V. PID data should read BARO is 21.3 in. Hg or more, ECT is 14-90.5° F (-10-32.5°C), IAT is 14-140°F (-10-60°C) and FTL V is 1.25-3.75 volts. If any PID data is not within specification, allow engine to cool down and repeat this step. If all PIDs are within specification, go to next step.
10. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Perform EVAP monitor repair verification drive mode. See «EVAP MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S11451666752001040500000) under DRIVE MODES. Using scan tool, access PID data for CDCV and FTP. If no EVAP system leaks were detected, system is okay at this time and go to step 36. If FTP does not change, evaporative system monitoring is inoperative, go to next step. If FTP changes, but does not reach.59 in. Hg, large leak is present in EVAP system, go to step 14. If FTP reaches.59 in. Hg, but suddenly returns to atmospheric pressure, pressure in fuel tank cannot be reduced and only gas from EVAP lines can be evacuated. Check rollover valve for blockage. Repair or replace as necessary. If rollover valve is okay, check for plugged CDCV air filter. If CDCV air filter is okay, go to step 30.
11. Turn ignition on. Disconnect vacuum lines from purge solenoid valve. Using vacuum pump, apply vacuum to purge solenoid valve. Purge solenoid valve should hold vacuum. Using scan tool, select SIMULATION TEST and PRGV PID data. Set PRGV PID data duty cycle to 50 percent. Purge solenoid valve should release vacuum. If purge solenoid valve operates as specified, go to next step. If purge solenoid valve does not operate as specified, replace purge solenoid valve and go to step 30.
12. Disconnect FTP sensor hose. Using scan tool, access FTP V PID data. If PID data is 2.25-2.75 volts, go to next step. If PID data is not 2.25-2.75 volts, replace FTP sensor and go to step 30.
13. Connect vacuum pump to FTP sensor. Apply 1.97 in. Hg to sensor. Using scan tool, access FTP V PID data. If PID data is.45-.55 volt, go to next step. If PID data is not.45-.55 volt, replace FTP sensor and go to step 30.
14. Remove catch tank. Inspect for damage or plugging. Replace as necessary and go to step 30. If catch tank is okay, go to next step.
15. Remove charcoal canister. Charcoal canister is located near fuel tank. Inspect for damage or plugging. Replace as necessary and to step 30. If charcoal canister is okay, go to next step.
16. Turn ignition on. Disconnect CDCV vacuum lines. Using vacuum pump, apply vacuum to CDCV. CDCV should not hold vacuum. Using scan tool, select SIMULATION TEST and activate CDCV. CDCV should hold vacuum. If CDCV operates as specified, repair leaking evaporative system hoses and go to step 30. If CDCV does not operate as specified, replace CDCV and go to step 30.
17. Using scan tool, perform whole system inspection. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Follow scan tool manufacturer's instructions. Vacuum should hold for 2 minutes or more. If vacuum does not hold, go to next step. If vacuum holds, no leaks are present, system is okay at this time, go to step 30.
18. Disconnect FTP sensor hose. Using scan tool, access FTP V PID data. If PID data is 2.25-2.75 volts, go to next step. If PID data is not 2.25-2.75 volts, replace FTP sensor and go to step 30.
19. Connect vacuum pump to fuel tank pressure sensor. Apply 1.97 in. Hg to sensor. Using scan tool, access FTP V PID data. If PID data is.45-.55 volt, go to next step. If PID data is not.45-.55 volt, replace FTP sensor and go to step 30.
20. Using scan tool, perform evaporative emission control system inspection check from charcoal canister to fuel tank. Follow scan tool manufacturer's instructions. Vacuum should hold for 2 minutes or more. If vacuum does not hold, go to next step. If vacuum holds, no leaks are present, go to step 26.
21. Inspect fuel tank and fuel gauge sending unit for leakage or damage. Repair or replace as necessary and go to step 30. If fuel tank and fuel gauge sending unit are okay, go to next step.
22. Check fuel shut off valve. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If fuel shut off valve is okay, go to next step. If fuel shut off valve is faulty, replace fuel tank and go to step 30.
23. Inspect rollover valve following way: Disconnect negative battery cable. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE in REMOVAL, OVERHAUL & INSTALLATION article. Remove rear seat cushion. Empty fuel tank. Disconnect fuel hoses and electrical connector. See FUEL LINE CONNECTORS in REMOVAL, OVERHAUL & INSTALLATION article. Remove fuel tank and place it right-side up on a level surface. Go to next step.
24. Plug all except rollover valve ports. See 30. Apply low-pressure air to one rollover valve port and ensure there is airflow from remaining 2 rollover valve ports. Repeat testing procedure for all 3 rollover valves. Air flow should be present at all rollover valve ports. If air flow is not present at any port, replace fuel tank. Go to step 30. If air flow is present at all rollover valve ports, go to next step.
25. Turn fuel tank upside-down and repeat testing procedure, from previous step, for all 3 rollover valves. Air flow should not be present at any rollover valve port. If air flow is present at any rollover valve port, replace fuel tank. Go to step 30. If air flow is not present at any rollover valve port, go to next step.
26. Using scan tool, perform evaporative emission control system inspection check from charcoal canister to purge solenoid valve. Follow scan tool manufacturer's instructions. Vacuum should hold for 2 minutes or more. If vacuum does not hold, go to next step. If vacuum holds, no leaks are present, go to step 30.
27. Inspect purge solenoid valve. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as necessary and go to step 30. If purge solenoid valve is okay, go to next step.
28. Remove charcoal canister. Charcoal canister is located next to fuel tank. Inspect for damage or plugging. Replace as necessary and to step 30. If charcoal canister is okay, go to next step.
29. Turn ignition on. Disconnect CDCV vacuum lines. Using vacuum pump, apply vacuum pump to CDCV. CDCV should not hold vacuum. Using scan tool, select SIMULATION TEST and activate CDCV. CDCV should hold vacuum. If CDCV operates as specified, repair leaking evaporative system hoses and go to next step. If CDCV does not operate as specified, replace CDCV and go to next step.
30. Reconnect all connectors. Turn ignition on. Using scan tool, access PID data for BARO, ECT, IAT and FTL V. PID data should read BARO is 21.3 in. Hg or more, ECT is 14-90.5° F (-10-32.5°C), IAT is 14-140°F (-10-60°C) and FTL V is 1.25-3.75 volts. If any PID data is not within specification, go to next step. If all PIDs are within specification, go to step 33.
31. Using scan tool, perform evaporative emission control system inspection. Follow scan tool manufacturer's instructions. If system fails, go to next step. If system passes, repair is complete and go to step 37.
32. Turn ignition on. Using scan tool, access PID data for BARO, ECT, IAT and FTL V. PID data should read BARO is 21.3 in. Hg or more, ECT is 14-90.5° F (-10-32.5°C), IAT is 14-140°F (-10-60°C) and FTL V is 1.25-3.75 volts. If any PID data is not within specification, allow engine to cool down and repeat this step. If all PIDs are within specification, go to next step.
33. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Review steps necessary to perform EVAP monitor repair verification drive mode. See «EVAP MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S11451666752001040500000) under DRIVE MODES. If EVAP monitor repair verification drive mode is not possible, go to next step. If EVAP monitor repair verification drive mode is possible, go to step 35.
34. Using scan tool, perform evaporative emission control system inspection. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Follow scan tool manufacturer's instructions. If system fails, replace PCM and go to step 37. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If system passes, repair is complete and go to step 37.
35. Perform EVAP monitor repair verification drive mode. See «EVAP MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S11451666752001040500000) under DRIVE MODES. Access ON BOARD SYSTEM READINESS TEST menu of GENERIC OBD II FUNCTION and check DRIVE MODE completion status. If EVAPORATIVE PURGE SYSTEM monitor is complete, go to next step. If EVAPORATIVE PURGE SYSTEM monitor is not complete, go to step 32.
36. Using scan tool, verify TEST #10:22:00 in DIAGNOSTIC MONITORING TEST RESULTS. If test does not exceed MAX value, go to next step. If test exceeds MAX value, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
37. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 26

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Inspect fuel gauge sending unit. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Repair or replace as needed and go to next step. If fuel gauge sending unit is okay, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
3. Using scan tool, verify PENDING TROUBLE CODE DTC and DIAGNOSTIC MONITORING TEST RESULTS. If any DTCs are present, go to applicable test and repair as needed. If no DTCs are present, testing is complete.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition on. Using scan tool, access FAN1 PID data. Using scan tool, activate FAN1 and listen to condenser fan relay No. 1 operation (click). (Scheme 27) If condenser fan relay No. 1 operation is not heard, go to next step. If condenser fan relay No. 1 operation is heard, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Disconnect condenser fan relay No. 1 connector. Check for damaged or corroded condenser fan relay No. 1 connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
4. Turn ignition on. Measure voltage between condenser fan relay No. 1 harness connector terminal "A" (Black/White wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire. See WIRING DIAGRAMS article. Go to step 9.
5. Turn ignition off. Check for continuity between condenser fan relay No. 1 terminals "A" (Black/White wire) and "B" (Brown wire). If continuity is present, go to next step. If continuity is not present, replace condenser fan relay No. 1 and go to step 9.
6. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
7. Check for continuity between condenser fan relay No. 1 harness connector terminal "B" (Brown wire) and ground. If continuity is present, repair short to ground in Brown wire between condenser fan relay No. 1 and PCM. See WIRING DIAGRAMS article. Go to step 9. If continuity is not present, measure voltage between condenser fan relay No. 1 harness connector terminal "B" (Brown wire) and ground. If battery voltage is present, repair short to power in Brown wire between condenser fan relay No. 1 and PCM. See WIRING DIAGRAMS article. Go to step 9. If no voltage is present, go to next step.
8. Check for continuity of Brown wire between condenser fan relay No. 1 harness connector terminal "B" and PCM harness connector terminal No. 1A. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Brown wire. See WIRING DIAGRAMS article. Go to next step.
9. Reconnect all connectors. Start engine. Turn A/C on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0480 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0480 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 27

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition on. Using scan tool, access FAN2 PID data. Using scan tool, activate FAN2 and listen to cooling fan relay No. 1 and condenser fan relay No. 2 operation (click). Cooling fan relays are located in relay box at right side of engine compartment. Condenser fan relays are located at right side of engine compartment. (Scheme 27)and (Scheme 28). If cooling fan relay No. 1 operation if not heard, go to next step. If condenser fan relay No. 2 operation is not heard, go to step 9. If cooling fan relay No. 1 and condenser fan relay No. 2 operation is heard, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Disconnect cooling fan relay No. 1 connector. Check for damaged or corroded cooling fan relay No. 1 connector terminals. Repair as necessary, and go to step 15. If connector terminals are okay, go to next step.
4. Turn ignition on. Measure voltage between cooling fan relay No. 1 harness connector terminal "A" (Black/White wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire. See WIRING DIAGRAMS article. Go to step 15.
5. Turn ignition off. Check for continuity between cooling fan relay No. 1 terminals "A" (Black/White wire) and "B" (Yellow wire). If continuity is present, go to next step. If continuity is not present, replace cooling fan relay No. 1 and go to step 15.
6. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 15. If connector terminals are okay, go to next step.
7. Check for continuity between cooling fan relay No. 1 harness connector terminal "B" (Yellow wire) and ground. If continuity is present, repair short to ground in Yellow wire between cooling fan relay No. 1 and PCM. See WIRING DIAGRAMS article. Go to step 15. If continuity is not present, measure voltage between cooling fan relay No. 1 harness connector terminal "B" (Yellow wire) and ground. If battery voltage is present, repair short to power in Yellow wire between cooling fan relay No. 1 and PCM. See WIRING DIAGRAMS article. Go to step 15. If no voltage is present, go to next step.
8. Check for continuity of Yellow wire between cooling fan relay No. 1 harness connector terminal "B" and PCM harness connector terminal No. 1E. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Yellow wire. See WIRING DIAGRAMS article. Go to step 15.
9. Turn ignition off. Disconnect condenser fan relay No. 2 connector. Check for damaged or corroded condenser fan relay No. 2 connector terminals. Repair as necessary, and go to step 15. If connector terminals are okay, go to next step.
10. Turn ignition on. Measure voltage between condenser fan relay No. 2 harness connector terminal "A" (Black/White wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire. See WIRING DIAGRAMS article. Go to step 15.
11. Turn ignition off. Check for continuity between condenser fan relay No. 2 terminals "A" (Black/White wire) and "B" (Yellow wire). If continuity is present, go to next step. If continuity is not present, replace condenser fan relay No. 2 and go to step 15.
12. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 15. If connector terminals are okay, go to next step.
13. Check for continuity between condenser fan relay No. 2 harness connector terminal "B" (Yellow wire) and ground. If continuity is present, repair short to ground in Yellow wire between condenser fan relay No. 2 and PCM. See WIRING DIAGRAMS article. Go to step 15. If continuity is not present, measure voltage between condenser fan relay No. 2 harness connector terminal "B" (Yellow wire) and ground. If battery voltage is present, repair short to power in Yellow wire between condenser fan relay No. 2 and PCM. See WIRING DIAGRAMS article. Go to step 15. If no voltage is present, go to next step.
14. Check for continuity of Yellow wire between condenser fan relay No. 2 harness connector terminal "B" and PCM harness connector terminal No. 1E. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Yellow wire. See WIRING DIAGRAMS article. Go to next step.
15. Reconnect all connectors. Start engine. Turn A/C on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0481 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0481 is not present, go to next step.
16. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition on. Using scan tool, access FAN3 PID data. Using scan tool, activate FAN3 and listen to cooling fan relay No. 2 and No. 3 operation (click). Cooling fan relays are located in relay box at right side of engine compartment. (Scheme 28) If cooling fan relay No. 2 operation if not heard, go to next step. If cooling fan relay No. 3 operation is not heard, go to step 9. If cooling fan relay No. 2 and No. 3 operation is heard, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Disconnect cooling fan relay No. 2 connector. Check for damaged or corroded cooling fan relay No. 2 connector terminals. Repair as necessary, and go to step 15. If connector terminals are okay, go to next step.
4. Turn ignition on. Measure voltage between cooling fan relay No. 2 harness connector terminal "A" (Black/White wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire. See WIRING DIAGRAMS article. Go to step 15.
5. Turn ignition off. Check for continuity between cooling fan relay No. 2 terminals "A" (Black/White wire) and "B" (Yellow/Black wire). If continuity is present, go to next step. If continuity is not present, replace cooling fan relay No. 2 and go to step 15.
6. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 15. If connector terminals are okay, go to next step.
7. Check for continuity between cooling fan relay No. 2 harness connector terminal "B" (Yellow/Black wire) and ground. If continuity is present, repair short to ground in Yellow/Black wire between cooling fan relay No. 2 and PCM. See WIRING DIAGRAMS article. Go to step 15. If continuity is not present, measure voltage between cooling fan relay No. 2 harness connector terminal "B" (Yellow/Black wire) and ground. If battery voltage is present, repair short to power in Yellow/Black wire between cooling fan relay No. 2 and PCM. See WIRING DIAGRAMS article. Go to step 15. If no voltage is present, go to next step.
8. Check for continuity of Yellow/Black wire between cooling fan relay No. 2 harness connector terminal "B" and PCM harness connector terminal No. 1I. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Yellow/Black wire. See WIRING DIAGRAMS article. Go to step 15.
9. Turn ignition off. Disconnect cooling fan relay No. 3 connector. Check for damaged or corroded cooling fan relay No. 3 connector terminals. Repair as necessary, and go to step 15. If connector terminals are okay, go to next step.
10. Turn ignition on. Measure voltage between cooling fan relay No. 3 harness connector terminal "A" (Black/White wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire. See WIRING DIAGRAMS article. Go to step 15.
11. Turn ignition off. Check for continuity between cooling fan relay No. 3 terminals "A" (Black/White wire) and "B" (Yellow/Black wire). If continuity is present, go to next step. If continuity is not present, replace cooling fan relay No. 3 and go to step 15.
12. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 15. If connector terminals are okay, go to next step.
13. Check for continuity between cooling fan relay No. 3 harness connector terminal "B" (Yellow/Black wire) and ground. If continuity is present, repair short to ground in Yellow/Black wire between cooling fan relay No. 3 and PCM. See WIRING DIAGRAMS article. Go to step 15. If continuity is not present, measure voltage between cooling fan relay No. 3 harness connector terminal "B" (Yellow/Black wire) and ground. If battery voltage is present, repair short to power in Yellow/Black wire between cooling fan relay No. 3 and PCM. See WIRING DIAGRAMS article. Go to step 15. If no voltage is present, go to next step.
14. Check for continuity of Yellow/Black wire between cooling fan relay No. 3 harness connector terminal "B" and PCM harness connector terminal No. 1I. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Yellow/Black wire. See WIRING DIAGRAMS article. Go to next step.
15. Reconnect all connectors. Start engine. Turn A/C on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0482 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0482 is not present, go to next step.
16. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 28

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Using scat tool, access VS PID data. Drive vehicle at 12.4 MPH and 24.8 MPH. Ensure scan tool reading matches vehicle speed indicated by speedometer. If readings do not match, go to next step. If reading match, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition on. Using scan tool, check for instrument cluster DTC 10 or DTC 12. If no DTCs are present, go to next step. If DTC 10 is detected, go to step 14. If DTC 12 is detected, repair that DTC first. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
4. Turn ignition off. Disconnect in-line 21-pin connector X17 connector. In-line 21-pin connector is located at lower right side of instrument panel. (Scheme 29) Check for damaged or corroded in-line 21-pin connector terminals. Repair as necessary, and go to step 18. If connector terminals are okay, go to next step.
5. Turn ignition on. Measure voltage between female side of in-line 21-pin connector terminal "L" (Green/Red wire) and ground. (Scheme 30) If 5 volts are present, go to step 10. If 5 volts are not present, go to next step.
6. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 18. If connector terminals are okay, go to next step.
7. Check for continuity of Green/Red wire between female side of in-line 21-pin connector terminal "L" and PCM harness connector terminal No. 1C. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Green/Red wire. See WIRING DIAGRAMS article. Go to step 18.
8. Check for continuity between female side of in-line 21-pin connector terminal "L" (Green/Red wire) and ground. (Scheme 30) If continuity is not present, go to next step. If continuity is present, repair short to ground in Green/Red wire between female side of in-line 21-pin connector and PCM. See WIRING DIAGRAMS article. Go to step 18.
9. Disconnect cruise control module connector. Check for damaged or corroded cruise control module connector terminals. Repair as necessary, and go to step 18. If connector terminals are okay, go to step 18.
10. Turn ignition off. Disconnect appropriate instrument cluster connector. Check for damaged or corroded instrument cluster connector terminals. Repair as necessary, and go to step 18. If connector terminals are okay, go to next step.
11. Reconnect in-line 21-pin connector. Turn ignition on. Measure voltage between instrument cluster harness connector terminal No. 2S and ground. If 5 volts are present, replace instrument cluster and go to step 18. If 5 volts are not present, go to next step.
12. Turn ignition off and disconnect in-line 21-pin connector. Check for continuity of Green/Red wire between male side of in-line 21-pin connector and instrument panel harness connector terminal No. 2S. If continuity is present, go to next step. If continuity is not present, repair open in Green/Red wire. See WIRING DIAGRAMS article. Go to step 18.
13. Check for continuity between instrument cluster harness connector terminal No. 2S (Green/Red wire) and ground. If continuity is not present, repair or replace instrument cluster and go to step 18. If continuity is present, repair short to ground in Green/Red wire between instrument cluster and male side of in-line 21-pin connector. See WIRING DIAGRAMS article. Go to step 18.
14. Check ABS/TCS HU/CM operation. See appropriate ANTI-LOCK/TCS article in BRAKES. Repair as necessary. If ABS/TCS HU/CM is okay, go to next step.
15. Turn ignition off. Disconnect ABS/TCS HU/CM connector. Check for damaged or corroded ABS/TCS HU/CM connector terminals. Repair as necessary, and go to step 18. If connector terminals are okay, go to next step.
16. Check for continuity of Blue/Black wire between ABS/TCS HU/CM harness connector terminal "Q" and instrument cluster harness connector terminal No. 3R. If continuity is present, go to next step. If continuity is not present, repair open in Blue/Black wire. See WIRING DIAGRAMS article. Go to step 18.
17. Check for continuity between ABS/TCS HU/CM harness connector terminal "Q" (Blue/Black wire) and ground. If continuity is present, repair short to ground in Blue/Black wire between ABS/TCS HU/CM and instrument cluster. If continuity is not present, check ABS/TCS HU/CM operation. See appropriate ANTI-LOCK/TCS article in BRAKES.
18. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Using scan tool, access PID data for LOAD and RPM. Drive vehicle for 33 seconds with engine speed at 1810 RPM or more and engine load at 40 percent or more. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0500 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0500 is not present, go to next step.
19. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 29

Scheme 30

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0505 is present, go to next step. If DTC P0505 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Disconnect IAC valve connector. Check for damaged or corroded IAC valve connector terminals. Repair as necessary, and go to step 23. If connector terminals are okay, go to next step.
4. Measure resistance between IAC valve connector terminals. If resistance is 10.7-12.3 ohms, go to next step. If resistance is not 10.7-12.3 ohms, replace IAC valve and go to step 23.
5. Turn ignition on. Measure voltage between IAC valve harness connector Red/Black wire terminal and ground. If battery voltage is present, go to step 9. If battery voltage is not present, repair open in Red/Black wire between IAC valve and main relay and go to next step.
6. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 23. If connector terminals are okay, go to next step.
7. Turn ignition on. Measure voltage between IAC valve harness connector Brown/Red terminal and ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Brown/Red wire. See WIRING DIAGRAMS article. Go to step 23.
8. Check for continuity between IAC valve harness connector Brown/Red wire terminal and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Brown/Red wire between IAC valve and PCM connector terminal No. 4M. See WIRING DIAGRAMS article. Go to step 23.
9. Check for continuity of Brown/Red wire between IAC valve harness connector and PCM harness connector terminal No. 4M. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Brown/Red wire. See WIRING DIAGRAMS article. Go to step 23.
10. Reconnect all connectors. Using scan tool, set IAC PID data to 100 duty cycle. If engine speed increases, go to next step. If engine speed does not increase, replace IAC valve and go to step 23.
11. Start engine and turn A/C on. Turn blower motor switch off. If A/C compressor clutch disengages, go to next step. If A/C compressor clutch does not disengage, repair continuous operation of A/C system and go to step 23. See appropriate A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
12. Turn ignition off. Ensure rear window defroster is off. Remove Daytime Running Lights (DRL) relay. (Scheme 27) Start engine. If engine speed increases, go to next step. If engine speed does not increase, repair short or open in suspect wire harness and go to step 23.
13. Using scan tool, access PRGV PID data. Using scan tool, activate PRGV PID data at zero duty cycle. If engine speed increases, go to next step. If engine speed does not increase, replace purge solenoid valve and go to step 23.
14. With engine running, remove air cleaner. If engine speed does not increase, go to next step. If engine speed increases, replace air filter and go to step 23.
15. Turn ignition off. Check throttle body for plugging. Clean or repair as necessary and go to step 23. If throttle body is okay, go to next step.
16. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to next step. If engine compression is not as specified, repair as necessary and go to step 23.
17. Start engine. Using scan tool, access IACV PID data. Using scan tool, set IACV PID data to zero duty cycle. If engine speed decreases, go to next step. If engine speed does not decrease, replace IAC valve and go to step 23.
18. Turn ignition off. Check both accelerator cable and cruise control actuator cable free play by turning actuator cable link. (Scheme 31) Measure distance cruise control actuator cable link moves before accelerator cable link begins to move. Cables are connected in line through cruise control actuator. Cruise control actuator cable free play should be 0.04-0.11" (1-3 mm). If cruise control actuator cable free play is not as specified, go to next step. If cruise control actuator cable free play is as specified, go to step 20.
19. To adjust, turn ignition off. Ensure throttle plate is closed. Adjust accelerator cable to eliminate any free play in accelerator cable. Accelerator cable adjusting nuts are located under cruise control actuator cover. Adjust cruise control actuator cable adjusting nut "A" at throttle body until free play is within specification. (Scheme 32) Go to step 23.
20. If actuator cable free play is as specified, depress accelerator pedal to floor. Ensure throttle plate is completely open. If throttle plate is not completely open, adjust actuator cable by turning adjusting nut "B". (Scheme 32) Go to step 23.
21. Check vacuum hoses. Ensure vacuum hoses are connected properly and are not damaged. Repair as necessary and go to step 23. If vacuum hoses are okay, go to next step.
22. Ensure throttle plate completely closes. If throttle plate does not close completely check throttle body for plugging. If throttle body is clean replace throttle body as necessary and go to next step. If throttle plate closes completely, go to next step.
23. Reconnect all connectors. Start engine. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, monitor PID data for BARO, ECT, IACV and IAT. PID data should read BARO is more than 21.3 in. Hg, ECT is 140° F (60°C), IACV is 1-4 milliseconds and IAT is 14°F (-10°C). Depress brake pedal while holding steering wheel straight ahead for 14 seconds or more. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0505 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0505 is not present, go to next step.
24. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 31

Scheme 32

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition on. Using scan tool, access CTP SW PID data. Depress and release accelerator pedal several times. If PID data changes according to accelerator pedal position, problem is intermittent. See TROUBLE SHOOTING - NO CODES article. If PID data does not change according to accelerator pedal position, release accelerator pedal and recheck. If PID data remains on, go to next step. If PID data turns off, go to step 6.
3. Turn ignition off. Disconnect TP sensor connector. (Scheme 22) Turn ignition on. If PID data remains on, go to next step. If PID data turn off, replace TP sensor and go to step 14.
4. Turn ignition off. Disconnect in-line, Black, 10-pin connector X18. (Scheme 22) Check for continuity between TP sensor harness connector terminal "C" (Pink wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Pink wire between TP sensor and male side of in-line, Black, 10-pin connector X18 terminal "E". Go to step 14.
5. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for continuity between female side of in-line, Black, 10-pin connector X18 terminal "E" (Pink wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Pink wire between in-line, Black, 10-pin connector X18 and PCM connector terminal No. 3X. Go to step 14.
6. Turn ignition on. Using scan tool, access CTP SW PID data. If PID data remains off, go to next step. If PID data changes to on, go to step 14.
7. Turn ignition off. Disconnect TP sensor connector. (Scheme 22) Check for damaged or corroded TP sensor connector terminals. Repair as necessary, and go to step 14. If connector terminals are okay, go to next step.
8. Connect a fused jumper wire between TP sensor harness connector terminals "C" (Pink wire) and "D" (Black Yellow wire). Turn ignition on. Using scan tool, access CTP SW PID data. If PID data remains off, go to next step. If PID data changes to on, replace TP sensor and go to step 14.
9. Turn ignition off. Disconnect in-line, Black, 10-pin connector X18. (Scheme 22) Check for continuity of Pink wire between TP sensor harness connector terminal "C" and male side of in-line, Black, 10-pin connector X18 terminal "E". If continuity is present, go to next step. If continuity is not present, repair open in Pink wire between TP sensor and male side of in-line, Black, 10-pin connector X18. Go to step 14.
10. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for continuity of Pink wire between PCM harness connector terminal No. 3X and female side of in-line, Black, 10-pin connector X18 terminal "E". (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Pink wire between PCM and female side of in-line, Black, 10-pin connector X18. Go to step 14.
11. Check for continuity of Black/Yellow wire between TP sensor harness connector terminal "D" and male side of in-line, Black, 10-pin connector X18 terminal "B". If continuity is present, go to next step. If continuity is not present, repair open in Black/Yellow wire between TP sensor and male side of in-line, Black, 10-pin connector X18. Go to step 14.
12. Check for continuity of Black/Yellow wire between PCM harness connector terminal No. 3AB and female side of in-line, Black, 10-pin connector X18 terminal "B". (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Black/Yellow wire between PCM and female side of in-line, Black, 10-pin connector X18. Go to step 14.
13. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, go to next step.
14. Reconnect all connectors. Start engine. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at speeds more than 18 MPH. Depress and release accelerator pedal 10 times or more while driving. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0505 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0505 is not present, go to next step.
15. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition on. Ensure steering wheel is straight ahead. Using scan tool, access PSP SW PID data. If PID data is on, go to next step. If PID data is off, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Disconnect PSP switch connector. Turn ignition on. Using scan tool, access PSP SW PID data. If PID data reads on, go to next step. If PID data reads off, replace PSP switch and go to step 5 .
4. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for continuity between ground and PSP harness connector Blue/Yellow wire terminal. If continuity is not present, go to next step. If continuity is present, repair short to ground in Blue/Yellow wire between PSP and PCM connector terminal No. 3T. See WIRING DIAGRAMS article. Go to next step.
5. Reconnect all connectors. Start engine. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Ensure ECT PID data is more than 140°F (60°C). Drive vehicle at more than 37 MPH for one minute. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0550 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0550 is not present, go to next step.
6. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Using scan tool, access BRK SW PID data. Depress and release brake pedal several times. PID data should read on when pedal is depressed and off when pedal is released. If PID data is not as specified, go to next step. If PID data is as specified, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Release brake pedal. Using scan tool, access BRK SW PID data. If PID data is on with pedal released, go to next step. If PID data is off with pedal released, go to step 10.
4. Turn ignition off. Disconnect brake switch connector. (Scheme 29) Check for damaged or corroded brake switch connector terminals. Repair as necessary, and go to step 20. If connector terminals are okay, go to next step.
5. Using scan tool, access BRK SW PID data. Turn ignition on. If PID data does not change to off, go to next step. If PID data changes to off, replace brake switch and go to step 20.
6. Turn ignition off. Disconnect noise suppressor connector. (Scheme 29) Check for damaged or corroded noise suppressor connector terminals. Repair as necessary, and go to step 20. If connector terminals are okay, go to next step.
7. Using scan tool, access BRK SW PID data. Turn ignition on. If PID data does not change to off, go to step 9. If PID data changes to off, replace brake switch and go to next step.
8. Measure voltage between ground and noise suppressor harness connector terminal "D" (Green/Black wire). If battery voltage is not present, replace noise suppressor and go to step 20. If battery voltage is present, repair short to power in Green/Black wire between noise suppressor and brake switch. See WIRING DIAGRAMS article. Go to step 20.
9. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 20. If connector terminals are okay, repair short in White/Green wire between noise suppressor connector terminal "B" and PCM connector terminal No. 1O. See WIRING DIAGRAMS article. Go to step 12.
10. Turn ignition off. Disconnect brake switch connector. (Scheme 29) Check for damaged or corroded brake switch connector terminals. Repair as necessary and go to step 20. If connector terminals are okay, go to next step.
11. Connect a fused jumper wire between brake switch harness connector terminals. Turn ignition on. Using scan tool, access BRK SW PID data. If PID data does not change to on, go to next step. If PID data changes to on, replace brake switch and go to step 20.
12. Turn ignition off. Disconnect brake switch connector. Measure voltage between brake switch harness connector terminal "A" (Green/Red wire) and ground. If battery voltage is present, go to step 16. If battery voltage is not present, go to next step.
13. Turn ignition on and off. Check brake switch connector for loose or damaged terminals, poor contact or corrosion. Repair as necessary and go to step 20. If no problems are found, go to next step.
14. Turn ignition on. Measure voltage between noise suppressor harness connector terminal "A" (Yellow/Red wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Yellow/Red wire. See WIRING DIAGRAMS article. Go to step 20.
15. Check for continuity of Green/Red wire between brake switch and noise suppressor harness connector terminal "C". If continuity is present, replace noise suppressor and go to step 20. If continuity is not present, repair open in Green/Red wire. See WIRING DIAGRAMS article. Go to step 20.
16. Turn ignition off. Disconnect noise suppressor connector. Check connector for loose or damaged terminals, poor contact or corrosion. Repair as necessary and go to step 20. If no problems are found, go to next step.
17. Reconnect brake switch and noise suppressor connectors. Turn ignition on. Depress brake pedal. Backprobing, measure voltage between noise suppressor connector terminal "B" (White/Green wire) and ground. If battery voltage is present, go to step 19. If battery voltage is not present, go to next step.
18. Depress brake pedal. Backprobing, measure voltage between noise suppressor connector terminal "D" (Green/Black wire) and ground. If battery voltage is present, replace noise suppressor and go to step 20. If battery voltage is not present, repair open in Green/Black wire between brake switch and noise suppressor. See WIRING DIAGRAMS article. Go to step 20.
19. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, repair open in White/Green wire between noise suppressor connector terminal "B" and PCM connector terminal No. 1O. See WIRING DIAGRAMS article. Go to next step.
20. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at 18 MPH or more. While driving, depress brake pedal 10 times or more. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0703 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P0703 is not present, go to next step.
21. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1110 is present, go to next step. If DTC P1110 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Using scan tool, access IATDC V PID data. If PID data is 0.1-4.9 volts, go to step 15. If PID data is less than 0.1 volt, go to next step. If PID data is more than 4.9 volts, go to step 8.
4. Turn ignition off. Disconnect air intake resonator IAT sensor connector. Check connector for loose or damaged terminals, poor contact or corrosion. Repair as necessary and go to step 17. If no problems are found, go to next step.
5. Turn ignition on. Using scan tool, access IATDC V PID data. If PID data is less than 0.1 volt, go to next step. If PID data is 0.1 volt or more, replace air intake resonator IAT sensor go to step 17.
6. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for continuity between air intake resonator IAT sensor harness connector terminal "A" (Light Green wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in Light Green wire between air intake resonator IAT sensor and PCM connector terminal No. 2C. See WIRING DIAGRAMS article. Go to step 17.
7. Check for continuity between air intake resonator IAT sensor harness connector terminals "A" (Light Green wire) and "B" (Black/Yellow wire). If continuity is not present, go to step 17. If continuity is present, repair short between circuits. Go to step 17.
8. Check air intake resonator IAT sensor connector for loose or damaged terminals, poor contact or corrosion. Repair as necessary and go to step 17. If no problems are found, go to next step.
9. Measure resistance between air intake resonator IAT sensor connector terminals. If resistance is 33 ohms or less, go to next step. If resistance is more than 33 ohms, replace air intake resonator IAT sensor and go to step 17.
10. Turn ignition on. Measure voltage between air intake resonator IAT sensor harness connector terminal "A" (Light Green wire) and ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Light Green wire between air intake resonator IAT sensor and PCM connector terminal No. 2C. Go to step 17.
11. Measure voltage between air intake resonator IAT sensor harness connector terminal "B" (Black/Yellow wire) and ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Black/Yellow wire between air intake resonator IAT sensor and PCM connector terminal No. 3AB. Go to step 17.
12. Turn ignition off. Disconnect appropriate PCM connector. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 17. If connector terminals are okay, go to next step.
13. Check for continuity of Light Green wire between air intake resonator IAT sensor harness connector terminal "A" and PCM harness connector terminal No. 2C. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Light Green wire. Go to step 17.
14. Check for continuity of Black/Yellow wire between air intake resonator IAT sensor harness connector terminal "B" and PCM harness connector terminal No. 3AB. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Black/Yellow wire. Go to step 17.
15. Measure resistance between air intake resonator IAT sensor connector terminals. If resistance is 26.5 ohms or less, go to next step. If resistance is more than 26.5 ohms, replace air intake resonator IAT sensor and go to step 17.
16. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, go to next step.
17. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Run engine under FREEZE FRAME DATA conditions. Ensure IAT PID data is more than 14°F (-10°C), ECT PID data is more than 158°F (70°C) and IATDC V PID data is 0.1-4.9 volts. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1110 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1110 is not present, go to next step.
18. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1113 is present, go to next step. If DTC P1113 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Start engine. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1540 is present, repair that DTC first and go to step 14. If DTC P1540 is not present, go to next step.
4. Ensure engine is running. Using scan tool, access IATLC V PID data. If PID data is less than 4.8 volts, go to step 6. If PID data is 4.8 volt or more, go to next step.
5. Turn ignition off. Disconnect L/C IAT sensor connector. (Scheme 22) Check connector for loose or damaged terminals, poor contact or corrosion. Repair as necessary and go to step 14. If no problems are found, go to next step.
6. Measure resistance between L/C IAT sensor connector terminals. If resistance is 12.7 ohms or less, go to next step. If resistance is more than 12.7 ohms, replace L/C IAT sensor and go to step 14.
7. Turn ignition on. Measure voltage between L/C IAT sensor harness connector terminal "A" (Green/White wire) and ground. If battery voltage is present, repair short to power in Green/White wire between L/C IAT sensor and PCM connector terminal No. 2K. Go to step 14. If battery voltage is not present, go to next step.
8. Measure voltage between L/C IAT sensor harness connector terminal "B" (Black/Yellow wire) and ground. If battery voltage is present, repair short to power in Black/Yellow wire between L/C IAT sensor and PCM connector terminal No. 3AB. Go to step 14. If battery voltage is not present, go to next step.
9. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 14. If connector terminals are okay, go to next step.
10. Check for continuity of Green/White wire between L/C IAT sensor harness connector terminal "A" and PCM harness connector terminal No. 2K. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Green/White wire. Go to step 14.
11. Check for continuity of Black/Yellow wire between L/C IAT sensor harness connector terminal "B" and PCM harness connector terminal No. 3AB. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Black/Yellow wire. Go to step 14.
12. Measure resistance between L/C IAT sensor connector terminals. If resistance is 9.6 ohms or less, go to next step. If resistance is more than 9.6 ohms, replace L/C IAT sensor and go to step 14.
13. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, go to next step.
14. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Run engine under FREEZE FRAME DATA conditions. Ensure IAT PID data is more than 32°F (0°C), ECT PID data is more than 176°F (80°C), IATLC V PID data is less than 4.8 volts and IATLC PID data is less than 302°F (150°C). Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1113 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1113 is not present, go to next step.
15. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTCs are present, go to appropriate DTC and repair first. If no other DTCs are present, go to next step.
3. Check if DTC P1170 is present in FREEZE FRAME DATA. If DTC P1170 is present, go to next step. If DTC P1170 is not present in FREEZE FRAME DATA, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
4. Start engine and allow it to reach operating temperature. Using scan tool, access FHO2SR PID data. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display FHO2SR PID data more than .45 volt during acceleration (rich condition) and less than .45 volt during deceleration fuel cut (lean condition). If voltage is as specified, go to next step. If voltage is not as specified, replace right front HO2S and go to step 19 .
5. Using scan tool, monitor LONGFT1 PID data. Compare with FREEZE FRAME DATA from step 1. If fuel trim is less in freeze frame, engine was driven under rich condition, go to next step. If fuel trim is more in freeze frame, engine was drive under lean condition, go to step 10 .
6. Check fuel line pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 8 . If fuel line pressure is not 30-41 psi (2.1-2.9 kg/cm 2 ), go to next step.
7. Ensure engine is running. Check for vacuum at fuel pressure regulator. If vacuum is present, check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, check fuel return line for plugging. Repair or replace as necessary. If fuel return line is okay, replace pressure regulator and go to step 19 . If vacuum is not present, ensure vacuum hoses are connected properly. Repair as necessary and go to step 19 . If vacuum hoses are okay, replace Pressure Regulator Control (PRC) solenoid valve and go to step 19 .
8. Turn ignition off. Disconnect both purge solenoid vacuum hoses. Blow air through purge solenoid valve. If air flows through valve, replace purge solenoid valve. If air does not flow through valve, go to step 13 .
9. Check PCV system. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If no problem is found, go to next step. If a problem is found, repair as necessary and go to step 19 .
10. Check fuel line pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 13 . If fuel line pressure is not 30-41 psi (2.1-2.9 kg/cm 2 ), go to next step.
11. Turn engine off. Turn ignition on. Check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If maximum pressure is 92-116 psi (6.4-8.2 kg/cm 2 ), go to next step. If maximum pressure is not 92-116 psi (6.4-8.2 kg/cm 2 ), check for open fuel pump circuits. Repair as necessary and go to step 19 . If fuel pump circuits are okay, replace fuel pump and go to step 19 .
12. Check for fuel line leaks. If any fuel line leaks are found, repair as necessary and go to step 19 . If no fuel line leaks are found, check for plugging at fuel filter and fuel inlet filter (sock). If plugging is present, check fuel tank for debris. If fuel tank is okay, replace fuel filter and go to step 19 . If fuel tank has debris, clean tank, replace fuel inlet filter (sock) and fuel filter. If fuel tank, fuel filter and fuel inlet filter (sock) are okay, replace fuel pressure regulator and go to step 19 .
13. Check primary and secondary ignition system. If both primary and secondary ignition system are okay, go to step 16 . If secondary ignition system is not operating properly, repair or replace as necessary. If primary ignition system is not operating properly, go to next step.
14. Disconnect suspect ignition coil connector. Turn ignition on. Measure voltage between ground and suspect ignition coil harness connector terminal "A" (Black/White wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire between ignition switch and suspect ignition coil. Go to step 19 . See WIRING DIAGRAMS article.
15. Check suspect ignition coil resistance. See BASIC DIAGNOSTIC PROCEDURES article. Replace ignition coil as necessary and go to step 19 . If ignition coil is okay, go to next step.
16. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to next step. If engine compression is not as specified, repair as necessary and go to next step.
17. Access and switch fuel injector in suspect cylinder with injector in the opposite bank. Recheck while operating vehicle under conditions similar to when DTC was set. If DTC changes to cylinder where suspect injector is installed, replace injector and go to step 19 . If DTC does not change, go to next step.
18. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak to combustion chamber and go to next step.
19. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine and allow engine to reach operating temperature. Using scan tool, access PID data for ECT and RPM. Ensure ECT PID data is more than 176°F (80°C) and RPM PID data is more than 1500 RPM for at least one minute. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1170 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1170 is not present, go to next step.
20. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, repair that DTC first. If no other DTC is present, go to next step.
3. Check if DTC P1173 is present in FREEZE FRAME DATA. If DTC P1173 is present, go to next step. If DTC P1173 is not present in FREEZE FRAME DATA, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
4. Start engine and allow it to reach operating temperature. Using scan tool, access FHO2SL PID data. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display PID data more than .45 volt during acceleration (rich condition) and less than .45 volt during deceleration fuel cut (lean condition). If voltage is as specified, go to next step. If voltage is not as specified, replace left front HO2S and go to step 19 .
5. Using scan tool, monitor LONGFT2 PID data. Compare with FREEZE FRAME DATA from step 1. If fuel trim is less in freeze frame, engine was driven under rich condition, go to next step. If fuel trim is more in freeze frame, engine was drive under lean condition, go to step 10 .
6. Check fuel line pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 8 . If fuel line pressure is not 30-41 psi (2.1-2.9 kg/cm 2 ), go to next step.
7. Ensure engine is running. Check for vacuum at fuel pressure regulator. If vacuum is present, check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, check fuel return line for plugging. Repair or replace as necessary. If fuel return line is okay, replace pressure regulator and go to step 19 . If vacuum is not present, ensure vacuum hoses are connected properly. Repair as necessary and go to step 19 . If vacuum hoses are okay, replace Pressure Regulator Control (PRC) solenoid valve and go to step 19 .
8. Turn ignition off. Disconnect both purge solenoid vacuum hoses. Blow air through purge solenoid valve. If air flows through valve, replace purge solenoid valve. If air does not flow through valve, go to step 13 .
9. Check PCV system. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If no problem is found, go to next step. If a problem is found, repair as necessary and go to step 19 .
10. Check fuel line pressure. See BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is 30-41 psi (2.1-2.9 kg/cm 2 ), go to step 13 . If fuel line pressure is not 30-41 psi (2.1-2.9 kg/cm 2 ), go to next step.
11. Turn engine off. Turn ignition on. Check fuel pump maximum pressure. See BASIC DIAGNOSTIC PROCEDURES article. If maximum pressure is 92-116 psi (6.4-8.2 kg/cm 2 ), go to next step. If maximum pressure is not 92-116 psi (6.4-8.2 kg/cm 2 ), check for open fuel pump circuits. Repair as necessary and go to step 19 . If fuel pump circuits are okay, replace fuel pump and go to step 19 .
12. Check for fuel line leaks. If any fuel line leaks are found, repair as necessary and go to step 19 . If no fuel line leaks are found, check for plugging at fuel filter and fuel inlet filter (sock). If plugging is present, check fuel tank for debris. If fuel tank is okay, replace fuel filter and go to step 19 . If fuel tank has debris, clean tank, replace fuel inlet filter (sock) and fuel filter. If fuel tank, fuel filter and fuel inlet filter (sock) are okay, replace fuel pressure regulator and go to step 19 .
13. Check primary and secondary ignition system. If both primary and secondary ignition system are okay, go to step 16 . If secondary ignition system is not operating properly, repair or replace as necessary. If primary ignition system is not operating properly, go to next step.
14. Disconnect suspect ignition coil connector. Turn ignition on. Measure voltage between ground and suspect ignition coil harness connector terminal "A" (Black/White wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire between ignition switch and suspect ignition coil. See WIRING DIAGRAMS article. Go to step 19 .
15. Check ignition coil resistance. See BASIC DIAGNOSTIC PROCEDURES article. Replace ignition coil as necessary and go to step 19 . If ignition coil is okay, go to next step.
16. Check engine compression. Engine compression should be a minimum of 120 psi (9 kg/cm 2 ) at 250 RPM with a maximum variation of 28 psi. If engine compression is as specified, go to next step. If engine compression is not as specified, repair as necessary and go to next step.
17. Access and switch fuel injector in suspect cylinder with injector in the opposite bank. Recheck while operating vehicle under conditions similar to when DTC was set. If DTC changes to cylinder where suspect injector is installed, replace injector and go to step 19 . If DTC does not change, go to next step.
18. Check cooling system for combustion gases. If no problem is found, go to next step. If combustion gases are found in cooling system, repair leak to combustion chamber and go to next step.
19. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine and allow engine to reach operating temperature. Using scan tool, access PID data for ECT and RPM. Ensure ECT PID data is more than 176°F (80°C) and RPM PID data is more than 1500 RPM for at least one minute. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1173 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1173 is not present, go to next step.
20. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition on. Using scan tool, access STA SW PID data. If PID data reads on, go to next step. If PID data reads off, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Disconnect starter terminal "S" connector. Turn ignition on. Measure voltage between ground and harness side of starter terminal "S" connector. If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in circuit between starter relay, starter and PCM. Go to step 6.
4. While listening to starter relay, turn ignition on. (Scheme 27) If starter relay clicks, go to next step. If starter relay does not click, replace starter relay and go to step 6.
5. Turn ignition off. Check starter operation. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS. Repair as necessary and go to next step. If starter is okay, go to next step.
6. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start and run engine at 2000 RPM. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1196 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1196 is not present, go to next step.
7. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1250 is present, go to next step. If DTC P1250 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Disconnect vacuum hose between PRC solenoid valve and intake manifold at PRC solenoid valve. Using vacuum pump, apply vacuum to PRC solenoid valve for 5 seconds. If vacuum holds for 5 seconds, go to step 5. If vacuum does not hold for 5 seconds, go to next step.
4. Turn ignition off. Disconnect PRC solenoid valve connector. If vacuum holds, repair short in Green/Black wire between PRC solenoid valve connector terminal "B" and PCM connector terminal No. 1B. See WIRING DIAGRAMS article. Go to step 10. If vacuum does not hold, replace PRC solenoid valve and go to step 10.
5. Disconnect PRC solenoid valve connector. Check for damaged or corroded PRC solenoid valve connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
6. Measure resistance between PRC solenoid valve terminals. If resistance is 36-40 ohms, go to next step. If resistance is not 36-40 ohms, replace PRC solenoid valve and go to step 10.
7. Turn ignition on. Measure voltage between PRC solenoid valve harness connector terminal "A" (Red/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/Black wire. See WIRING DIAGRAMS article. Go to step 10.
8. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
9. Reconnect PRC solenoid valve connector. Turn ignition on. Measure voltage between PCM harness connector terminal No. 1B (Green/Black wire) and ground. (Scheme 35) If battery voltage is present, go to next step. If battery voltage is not present, repair open in Green/Black wire between PRC solenoid valve and PCM.
10. Reconnect all connectors. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1250 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1250 is not present, go to next step.
11. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Start engine. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1345 is present, go to next step. If DTC P1345 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Disconnect CMP sensor connector. Check for damaged or corroded CMP sensor connector terminals. Repair as necessary, and go to step 8 . If connector terminals are okay, go to next step.
4. Turn ignition on. Measure voltage between CMP sensor harness connector terminal "B" (Red/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open or short in Red/Black wire between CMP sensor and main relay. See WIRING DIAGRAMS article. Go to step 9 .
5. Measure voltage between CMP sensor harness connector terminal "C" (Yellow/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Yellow/Black wire between CMP sensor and main relay. See WIRING DIAGRAMS article. Go to step 9 .
6. Turn ignition off. Check for continuity between CMP sensor harness connector terminal "A" (Black/Blue wire) and ground. If continuity is present, go to next step. If continuity is not present, repair open in Black/Blue wire. See WIRING DIAGRAMS article. Go to step 9 .
7. Reconnect CMP sensor connector. Crank engine. Backprobing, check for pulsation signal between PCM connector terminal No. 4F (Yellow/Black wire) and ground. If pulsation signal is present, go to next step. If pulsation signal is not present, check for damaged or corroded CMP sensor and PCM connector terminals. Repair as necessary, and go to next step.
8. Check CKP sensor operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as necessary and go to next step. If CKP sensor is okay, go to next step.
9. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1345 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1345 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Start engine. Using scan tool, access EGRP V PID data. If PID data is 0.2-4.7 volts, problem is intermittent. See TROUBLE SHOOTING - NO CODES article. If PID data is less than 0.2 volt, go to next step. If PID data is more than 4.7 volts, go to step 7.
3. Disconnect EGR valve position sensor connector. (Scheme 22) If EGRP V PID data is more than 4.8 volts, go to next step. If EGRP V PID data is 4.8 volts or less, go to step 5.
4. Turn ignition on. Measure voltage between EGR valve position sensor harness connector terminal "B" (Light Green/Red wire) and ground. If 4.5-5.5 volts are present, check for poor connection at EGR valve position sensor connector. Repair as necessary. If connector connection is okay, replace EGR valve position sensor and go to step 6. If 4.5-5.5 volts are not present, repair open in Light Green/Red wire between EGR valve position sensor and PCM connector terminal No. 3A. See WIRING DIAGRAMS article. Go to step 6.
5. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for continuity between EGR valve position sensor harness connector terminal "C" (Red/Black wire) and ground. If continuity is present, repair short to ground in Red/Black wire. See WIRING DIAGRAMS article. Go to next step. If continuity is not present, repair short between Red/Black wire and Black/Yellow wire. See WIRING DIAGRAMS article. Go to step 12.
6. Check for continuity between EGR valve position sensor harness connector terminals "A" (Black/Yellow wire) and "C" (Red/Black wire). If continuity is not present, go to step 12. If continuity is present, repair short between circuits and go to step 12.
7. Check for damaged or corroded EGR valve position sensor connector terminals. Repair as necessary, and go to step 12. If connector terminals are okay, go to next step.
8. Check for continuity between EGR valve position sensor harness connector terminal "A" (Black/Yellow wire) and ground. If continuity is present, go to next step. If continuity is not present, repair open in Black/Yellow wire between EGR valve position sensor harness connector and PCM harness connector terminal No. 3AB. (Scheme 35) Go to step 12.
9. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 12. If connector terminals are okay, go to next step.
10. Check for continuity between EGR valve position sensor harness connector terminals "B" (Light Green/Red wire) and "C" (Red/Black wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits and go to step 12.
11. Check for continuity of Red/Black wire between EGR valve position sensor harness connector terminal "C" and PCM harness connector terminal No. 3R. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Red/Black wire. See WIRING DIAGRAMS article. Go to next step.
12. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, access EGRP V PID data. Ensure PID data is 0.2-4.7 volts. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1402 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1402 is not present, go to next step.
13. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1449 is present, go to next step. If DTC P1449 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Disconnect vacuum line located between CDCV and charcoal canister at CDCV. Using vacuum pump, apply vacuum to CDCV. If vacuum is held for a few seconds, go to next step. If vacuum is not held for a few seconds, go to step 5.
4. Turn ignition off. Disconnect CDCV connector. Using vacuum pump, apply vacuum to CDCV. If vacuum is held for a few seconds, replace CDCV and go to step 10. If vacuum is not held for a few seconds, repair short in harness and go to step 10.
5. Disconnect CDCV connector. Check for damaged or corroded CDCV connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
6. Measure resistance between CDCV terminals. If resistance is 17-21 ohms, go to next step. If resistance is not 17-21 ohms, replace CDCV and go to step 10.
7. Turn ignition on. Measure voltage between CDCV harness connector terminal "A" (Black/White wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/White wire. See WIRING DIAGRAMS article. Go to step 10.
8. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
9. Reconnect CDCV connector. Measure voltage between PCM harness connector terminal No. 4R (Violet/Red wire) and ground. (Scheme 35) If battery voltage is present, go to next step. If battery voltage is not present, repair open in circuit between CDCV connector terminal "B" and PCM. See WIRING DIAGRAMS article. Go to next step.
10. Reconnect all connectors. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1449 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1449 is not present, go to next step.
11. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTCs P0443 or P1449 are present, diagnose and repair these DTCs first. See «DTC P0443: EVAP CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT MALFUNCTION»(ref-11774-S26209599472000112700000) or «DTC P1449: CANISTER DRAIN CUT VALVE (CDCV) CIRCUIT MALFUNCTION»(ref-11774-S33751270012000112700000). If DTCs P0443 and P1449 are not present, go to next step.
3. Using scan tool, activate CDCV while listening for CDCV operation sound. CDCV is located at leaf rear for vehicle. See. (Scheme 26). If CDCV operation sound is heard, go to next step. If CDCV operation sound is not heard, check CDCV and related harness for malfunction. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Repair as necessary and go to step 8.
4. Disconnect vacuum hoses between intake manifold and purge solenoid valve from purge solenoid valve. Using vacuum pump, apply vacuum to purge solenoid valve for a few seconds. If vacuum holds, disconnect vacuum pump and reconnect vacuum hose to purge solenoid valve. Go to next step. If vacuum does not hold, check purge solenoid valve and related harness for malfunction. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Repair as necessary and go to step 8.
5. Remove charcoal canister and check charcoal canister for plugging. Replace as necessary and go to step 8. If charcoal canister is okay, go to next step.
6. Check fuel tank pressure sensor operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Repair as necessary and go to step 8. If fuel tank pressure sensor is okay, go to next step.
7. Check CDCV air filter for plugging. Replace as necessary and go to next step. If CDCV air filter is okay check for plugging in hoses between charcoal canister and CDCV. Also check for plugging in drain passage and check valve. Repair as necessary and go to next step.
8. Turn ignition on. Using scan tool, monitor PID data for BARO, ECT, IAT and FTL V. PID data should read BARO is 21.3 in. Hg or more, ECT is 14-90.5° F (-10-32.5°C), IAT is 14-140°F (-10-60°C) and FTL V is 1.25-3.75 volts. If any signals are not within specification, allow engine to cool down and repeat this step. If all signals are within specification, go to next step.
9. Reconnect all connectors. Perform EVAP monitor repair verification drive mode. See «EVAP MONITOR REPAIR VERIFICATION DRIVE MODE»(ref-11774-S11451666752001040500000) under DRIVE MODES. Access ON BOARD SYSTEM READINESS TEST menu of GENERIC OBD II FUNCTION and check DRIVE MODE completion status. If evaporative purge system monitor is complete, go to next step. If evaporative purge system monitor is not complete, repeat step 8.
10. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1450 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1450 is not present, go to next step.
11. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1455 is present, go to next step. If DTC P1455 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Turn ignition on. Check for instrument cluster DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If instrument cluster DTC 22 is not present, go to next step. If instrument cluster DTC 22 is present, repair that DTC first and go to step 9. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
4. Turn ignition off. Disconnect appropriate instrument cluster connector. Check for damaged or corroded instrument cluster connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
5. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 9. If connector terminals are okay, go to next step.
6. Check for continuity of Blue/Yellow wire between PCM harness connector terminal No. 3K and instrument cluster harness connector terminal No. 3L. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Blue/Yellow wire. See WIRING DIAGRAMS article. Go to step 9.
7. Check for continuity between PCM harness connector terminal No. 3K (Blue/Yellow wire) and ground. (Scheme 35) If continuity is not present, go to next step. If continuity is present, repair short to ground in Blue/Yellow wire between PCM and instrument cluster harness connector terminal No. 3L. See WIRING DIAGRAMS article. Go to step 9.
8. Turn ignition on. Measure voltage between PCM harness connector terminal No. 3K (Blue/Yellow wire) and ground. If voltage is not present, go to next step. If voltage is present, repair short to power in Blue/Yellow wire between PCM and instrument cluster harness connector terminal No. 3L. See WIRING DIAGRAMS article. Go to next step.
9. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Using scan tool, access FTL V PID data. Ensure PID data is 0.1-7.2 volts. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1455 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1455 is not present, go to next step.
10. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1487 is present, go to next step. If DTC P1487 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Disconnect vacuum hose between MAP sensor solenoid valve and EGR valve at MAP sensor solenoid valve. (Scheme 22) Using vacuum pump, apply vacuum to MAP sensor solenoid valve. If vacuum holds for 5 seconds, go to step 5. If vacuum does not hold for 5 seconds, go to next step.
4. Turn ignition off. Disconnect MAP sensor solenoid valve connector. If vacuum holds for 5 seconds, repair short to ground in White/Green wire between MAP sensor solenoid valve and PCM connector terminal No. 4P. See WIRING DIAGRAMS article. Go to step 10. If vacuum does not hold for 5 seconds, replace MAP sensor solenoid valve and go to step 10.
5. Disconnect MAP sensor solenoid valve connector. Check for damaged or corroded MAP sensor solenoid valve connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
6. Measure resistance between MAP sensor solenoid valve connector terminals. If resistance is 36-40 ohms, go to next step. If resistance is not 36-40 ohms, replace MAP sensor solenoid valve and go to step 10.
7. Turn ignition on. Measure voltage between MAP sensor solenoid valve harness connector terminal "A" (Red/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/Black wire between MAP sensor solenoid valve and main relay. See WIRING DIAGRAMS article. Go to step 10.
8. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
9. Reconnect MAP sensor solenoid valve connector. Turn ignition on. Measure voltage between PCM harness connector terminal No. 4P (White/Green wire) and ground. (Scheme 35) If battery voltage is present, go to next step. If battery voltage is not present, repair open in White/Green wire between PCM and MAP sensor solenoid valve. See WIRING DIAGRAMS article. Go to next step.
10. Reconnect all connectors. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1487 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1487 is not present, go to next step.
11. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1508 is present, go to next step. If DTC P1508 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Disconnect vacuum hose between by-pass air solenoid valve and intake manifold at by-pass air solenoid valve. Using vacuum pump, apply vacuum to by-pass air solenoid valve. If vacuum holds for 5 seconds, go to step 5. If vacuum does not hold for 5 seconds, go to next step.
4. Turn ignition off. Disconnect by-pass air solenoid valve connector. Using vacuum pump, apply vacuum to by-pass air solenoid valve. If vacuum holds for 5 seconds, repair short to ground in harness and go to step 10. If vacuum does not hold for 5 seconds, replace by-pass air solenoid valve and go to step 10.
5. Disconnect by-pass air solenoid valve connector. Check for damaged or corroded by-pass air solenoid valve connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
6. Measure resistance between by-pass air solenoid valve connector terminals. If resistance is 29-35 ohms, go to next step. If resistance is not 29-35 ohms, replace by-pass air solenoid valve and go to step 10.
7. Turn ignition on. Measure voltage between by-pass air solenoid valve harness connector terminal "A" (Red/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/Black wire between by-pass air solenoid valve and main relay. See WIRING DIAGRAMS article. Go to step 10.
8. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
9. Reconnect by-pass air solenoid valve connector. Turn ignition on. Measure voltage between PCM harness connector terminal No. 1AA (White/Blue wire) and ground. (Scheme 35) If battery voltage is present, go to next step. If battery voltage is not present, repair open in White/Blue wire between PCM and by-pass air solenoid valve. See WIRING DIAGRAMS article. Go to next step.
10. Reconnect all connectors. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1508 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1508 is not present, go to next step.
11. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1524 is present, go to next step. If DTC P1524 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Disconnect vacuum hose between charge air cooler by-pass solenoid valve and intake manifold at air cooler by-pass solenoid valve. Using vacuum pump, apply vacuum to charge air cooler by-pass solenoid valve. If vacuum holds for 5 seconds, go to step 5. If vacuum does not hold for 5 seconds, go to next step.
4. Turn ignition off. Disconnect charge air cooler by-pass solenoid valve connector. Using vacuum pump, apply vacuum to charge air cooler by-pass solenoid valve. If vacuum holds for 5 seconds, repair short in harness and go to step 10. If vacuum does not hold for 5 seconds, replace charge air cooler by-pass solenoid valve and go to step 10.
5. Disconnect charge air cooler by-pass solenoid valve connector. Check for damaged or corroded charge air cooler by-pass solenoid valve connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
6. Measure resistance between charge air cooler by-pass solenoid valve connector terminals. If resistance is 36-40 ohms, go to next step. If resistance is not 36-40 ohms, replace charge air cooler by-pass solenoid valve and go to step 10.
7. Turn ignition on. Measure voltage between charge air cooler by-pass solenoid valve harness connector terminal "A" (Red/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/Black wire between charge air cooler by-pass solenoid valve and main relay. See WIRING DIAGRAMS article. Go to step 10.
8. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
9. Reconnect charge air cooler by-pass solenoid valve connector. Turn ignition on. Measure voltage between PCM harness connector terminal No. 2E (Blue/Yellow wire) and ground. (Scheme 35) If battery voltage is present, go to next step. If battery voltage is not present, repair open in Blue/Yellow wire between PCM and charge air cooler by-pass solenoid valve. See WIRING DIAGRAMS article. Go to next step.
10. Reconnect all connectors. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1524 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1524 is not present, go to next step.
11. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1525 is present, go to next step. If DTC P1525 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Disconnect vacuum hose between ABV solenoid valve (vacuum) and intake manifold at ABV solenoid valve (vacuum). Using vacuum pump, apply vacuum to ABV solenoid valve (vacuum). If vacuum holds for 5 seconds, go to step 5. If vacuum does not hold for 5 seconds, go to next step.
4. Turn ignition off. Disconnect ABV solenoid valve (vacuum) connector. Using vacuum pump, apply vacuum to ABV solenoid valve (vacuum). If vacuum holds for 5 seconds, repair short in harness and go to step 10. If vacuum does not hold for 5 seconds, replace ABV solenoid valve (vacuum) and go to step 10.
5. Disconnect ABV solenoid valve (vacuum) connector. Check for damaged or corroded ABV solenoid valve (vacuum) connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
6. Measure resistance between ABV solenoid valve (vacuum) connector terminals. If resistance is 22-26 ohms, go to next step. If resistance is not 22-26 ohms, replace ABV solenoid valve (vacuum) and go to step 10.
7. Turn ignition on. Measure voltage between ABV solenoid valve (vacuum) harness connector terminal "A" (Red/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/Black wire between ABV solenoid valve (vacuum) and main relay. See WIRING DIAGRAMS article. Go to step 10.
8. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
9. Reconnect ABV solenoid valve (vacuum) connector. Turn ignition on. Measure voltage between PCM harness connector terminal No. 2M (White/Red wire) and ground. (Scheme 35) If battery voltage is present, go to next step. If battery voltage is not present, repair open in White/Red wire between PCM and ABV solenoid valve (vacuum). See WIRING DIAGRAMS article. Go to next step.
10. Reconnect all connectors. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1525 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1525 is not present, go to next step.
11. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1526 is present, go to next step. If DTC P1526 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
3. Disconnect vacuum hose between ABV solenoid valve (vent) and intake manifold at ABV solenoid valve (vent). Using vacuum pump, apply vacuum to ABV solenoid valve (vent). If vacuum holds for 5 seconds, go to step 5. If vacuum does not hold for 5 seconds, go to next step.
4. Turn ignition off. Disconnect ABV solenoid valve (vent) connector. Using vacuum pump, apply vacuum to ABV solenoid valve (vent). If vacuum holds for 5 seconds, repair short in harness and go to step 10. If vacuum does not hold for 5 seconds, replace ABV solenoid valve (vent) and go to step 10.
5. Disconnect ABV solenoid valve (vent) connector. Check for damaged or corroded ABV solenoid valve (vent) connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
6. Measure resistance between ABV solenoid valve (vent) connector terminals. If resistance is 22-26 ohms, go to next step. If resistance is not 22-26 ohms, replace ABV solenoid valve (vent) and go to step 10.
7. Turn ignition on. Measure voltage between ABV solenoid valve (vent) harness connector terminal "A" (Red/Black wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/Black wire between ABV solenoid valve (vent) and main relay. See WIRING DIAGRAMS article. Go to step 10.
8. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 10. If connector terminals are okay, go to next step.
9. Reconnect ABV solenoid valve (vent) connector. Turn ignition on. Measure voltage between PCM harness connector terminal No. 2A (Brown/Yellow wire) and ground. (Scheme 35) If battery voltage is present, go to next step. If battery voltage is not present, repair open in Brown/Yellow wire between PCM and ABV solenoid valve (vent). See WIRING DIAGRAMS article. Go to next step.
10. Reconnect all connectors. Turn ignition off and on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1526 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1526 is not present, go to next step.
11. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition on. Check for DTC P0105, P1113, P1487, P1524, P1525 and P1526. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1526 is present, go to next step. If any other DTC is present, repair that DTC first. If no DTC is present, go to next step.
3. Turn ignition off. Disconnect vacuum hose from change air cooler by-pass actuator. Using vacuum pump, apply vacuum to change air cooler by-pass actuator. If change air cooler by-pass actuator is not operating, go to next step. If change air cooler by-pass actuator is operating, replace change air cooler by-pass actuator and go to step 6 .
4. Inspect ABV actuator operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as needed and go to step 6 . If ABV actuator is okay, go to next step.
5. Check ABV vacuum hoses for damage, plugging and poor connection. Repair as necessary and go to next step. If vacuum hoses are okay, go to next step.
6. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Run engine under FREEZE FRAME DATA conditions. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1540 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1540 is not present, go to next step.
7. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off. Using scan tool, access PID data for RTQ1 and RTQ2. Drive vehicle. Down shift and up shift wile driving. If PID data for RTQ1 and RTQ2 does not change, go to next step. If PID data for RTQ1 and RTQ2 changes, go to step 8.
3. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 8. If connector terminals are okay, go to next step.
4. Measure voltage between PCM harness connector terminal No. 1B (Green wire) and ground. (Scheme 35) If 4.5-5.5 volts is present, go to next step. If 4.5-5.5 volts is not present, repair open or short in Green wire between PCM and TCM connector terminal No. 2K. (Scheme 33) Go to step 8.
5. Disconnect appropriate TCM connector. Check for damaged or corroded TCM connector terminals. Repair as necessary, and go to step 8. If connector terminals are okay, go to next step.
6. Turn ignition off. Reconnect PCM connector. Turn ignition on. Measure voltage between TCM harness connector terminal No. 2N (White/Red wire) and ground. If 4.5-5.5 volts is present, go to next step. If 4.5-5.5 volts is not present, repair open or short in White/Red wire between TCM and PCM connector terminal No. 1F. Go to step 8.
7. Check TCM operation. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. Replace as needed and go to next step. If TCM is okay, go to next step.
8. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1601 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1601 is not present, go to next step.
9. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 33

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Disconnect the following component connectors and check for voltage between harness connector terminals listed and ground: Pressure Regulator Control (PRC) solenoid valve terminal "B" (Green/Black wire). Canister Drain Cut Valve (CDCV) terminal "B" (Blue/Black wire). Charge air cooler by-pass solenoid valve terminal "B" (Blue/Yellow wire). Purge solenoid valve terminal "B" (White/Black wire). If voltage is not present, go to next step. If voltage is present, repair short to power in suspect circuit and go to next step.
3. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1608 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1608 is not present, go to next step.
4. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Turn ignition off and start engine. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1609 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1609 is not present, go to next step.
3. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 8. If connector terminals are okay, go to next step.
3. Turn ignition on. Measure voltage between PCM harness connector terminal No. 1Q (Violet/Red wire) and ground. (Scheme 35) If voltage is not present, go to next step. If voltage is present, repair short to power in Violet/Red wire between PCM and ABS/TCS HU/CM connector terminal "R". (Scheme 34) See WIRING DIAGRAMS article. Go to step 9.
4. Turn ignition off. Check for continuity between PCM harness connector terminal No. 1Q and ground. (Scheme 35) If continuity is not present, go to next step. If continuity is present, repair short to ground in Violet/Red wire between PCM and ABS/TCS HU/CM connector terminal "R". (Scheme 34) See WIRING DIAGRAMS article. Go to step 8.
5. Disconnect ABS/TCS HU/CM connect. Check for damaged or corroded ABS/TCS HU/CM connector terminals. Repair as necessary, and go to step 8. If connector terminals are okay, go to next step.
6. Check for continuity of Violet/Red wire between PCM harness connector terminal No. 1Q and ABS/TCS HU/CM harness connector terminal "R". If continuity is present, go to next step. If continuity is not present, repair open in Violet/Red wire. See WIRING DIAGRAMS article. Go to step 8.
7. Reconnect all connectors. Turn ignition on. Backprobing, check for AC voltage between PCM connector terminal No. 1Q (Violet/Red wire) and ground. If AC voltage is present, go to next step. If AC voltage is not present, replace ABS/TCS HU/CM and go to next step.
8. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Drive vehicle at more than 3.3 MPH. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1627 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1627 is not present, go to next step.
9. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

Scheme 34

1. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 8. If connector terminals are okay, go to next step.
3. Turn ignition on. Measure voltage between PCM harness connector terminal No. 3W (Pink/Black wire) and ground. (Scheme 35) If voltage is not present, go to next step. If voltage is present, repair short to power in Pink/Black wire between PCM and ABS/TCS connector terminal "R". (Scheme 34) See WIRING DIAGRAMS article. Go to step 8.
4. Turn ignition off. Check for continuity between PCM harness connector terminal No. 3W and ground. (Scheme 35) If continuity is not present, go to next step. If continuity is present, repair short to ground in Pink/Black wire between PCM and ABS/TCS connector terminal "J". (Scheme 34) See WIRING DIAGRAMS article. Go to step 8.
5. Disconnect ABS/TCS connector. Check for damaged or corroded ABS/TCS connector terminals. Repair as necessary, and go to step 8. If connector terminals are okay, go to next step.
6. Check for continuity of Pink/Black wire between PCM harness connector terminal No. 3W and ABS/TCS harness connector terminal "J". If continuity is present, go to next step. If continuity is not present, repair open in Pink/Black wire. See WIRING DIAGRAMS article. Go to step 8.
7. Reconnect all connectors. Turn ignition on. Backprobing, check for AC voltage between PCM connector terminal No. 3W (Pink/Black wire) and ground. If AC voltage is present, go to next step. If AC voltage is not present, replace ABS/TCS and go to next step.
8. Reconnect all connectors. Turn ignition on. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Start engine. Drive vehicle at more than 3.3 MPH. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1628 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1628 is not present, go to next step.
9. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
2. Turn ignition off. Check for open or improperly installed ROOM fuse (15-amp). Fuse is located in drivers side fuse panel. If fuse is okay, go to step 4. If fuse is open, go to next step. If fuse is improperly installed, reinstall fuse and go to step 6.
3. Disconnect battery cables. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Measure resistance between PCM harness connector terminal No. 4B (Blue/Red wire) and ground. (Scheme 35) If resistance is more than 500 ohms, go to step 6. If resistance is 500 ohms or less, repair short to ground in Blue/Red wire between ROOM fuse (15-amp) and PCM connector terminal No. 4B and install new fuse. See WIRING DIAGRAMS article. Go to step 6.
4. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step 6. If connector terminals are okay, go to next step.
5. Check for continuity of Blue/Red wire between ROOM fuse (15-amp) and PCM harness connector terminal No. 4B. (Scheme 35) If continuity is present, go to next step. If continuity is not present, repair open in Blue/Red wire. See WIRING DIAGRAMS article. Go to next step.
6. Reconnect all connectors. Clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11774-S08214194262001040500000) under SELF-DIAGNOSTIC SYSTEM. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If DTC P1794 is present, replace PCM and go to next step. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. If DTC P1794 is not present, go to next step.
7. Cycle ignition from off to on. Check for DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11774-S17879531632001040500000) under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.

1. If result of suspect reference voltage circuit being measured is 6 volts or less, go to next step. If result of suspect reference voltage being measured is more than 6 volts, go to step 14.
2. Turn ignition on. If battery voltage is more than 10.5 volts, go to next step. If battery voltage 10.5 volts or less, check charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.
3. Disconnect sensor with suspected incorrect reference voltage. Measure voltage between battery positive terminal and suspect sensor harness connector ground terminal (Black/Yellow wire). See WIRING DIAGRAMS article. If voltage is more than 10.5 volts and within one volt of battery voltage, go to next step. If voltage is 10.5 volts or less, or is more or less than one volt from battery voltage, go to step 9.
4. Turn ignition on. Using scan tool, access ECT PID data. If PID data cannot be accessed, go to next step. If PID data can be accessed, go to step 8.
5. Turn ignition off. Disconnect TP sensor and EGR valve position sensor connectors. (Scheme 22) Turn ignition on. Measure voltage between TP sensor harness connector terminals "A" (Light Green/Red wire) and "D" (Black/Yellow wire). See WIRING DIAGRAMS article. If voltage is 4-6 volts, replace EGR valve position sensor. If voltage is not 4-6 volts, go to next step.
6. Turn ignition off. Disconnect appropriate PCM connectors. Turn ignition on. Measure voltage between PCM harness connector terminals No. 4A (Red/Black wire) and No. 3AB (Black/Yellow wire). (Scheme 35) If more than 10.5 volts are present, go to next step. If 10.5 volts or less are present, repair Red/Black wire between PCM and main relay. See WIRING DIAGRAMS article.
7. Turn ignition off. Ensure TP sensor, EGR valve position sensor, MAP sensor and FTP sensor are disconnected. (Scheme 22)and (Scheme 25). Disconnect scan tool. Measure resistance between PCM harness connector terminals No. 3A (Light Green/Red wire) and No. 3AB (Black/Yellow wire). (Scheme 35) If resistance is 10 k/ohms or less, repair short to ground in Light Green/Red wire. If resistance is more than 10 k/ohms, reconnect all components and recheck reference voltage. If reference voltage is still not 4-6 volts, replace PCM. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
8. Turn ignition off. Disconnect appropriate PCM connectors. Disconnect suspect sensor connector. Measure resistance in Light Green/Red wire between PCM connector terminal No. 3A and suspect sensor harness connector reference voltage terminal. (Scheme 35) If resistance is 5 ohms or more, repair open circuit or poor connection. If resistance is less than 5 ohms, recheck reference voltage. If reference voltage is still not 4-6 volts, replace PCM. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
9. Turn ignition on. Using scan tool, access ECT PID data. If PID data can be accessed, go to next step. If PID data cannot be accessed, go to step 12.
10. If two or more DTCs for sensors connected to sensor ground circuit (PCM connector terminal No. 3AB) are present, go to next step. (Scheme 35) Sensors include the following: Air cleaner IAT sensor. Air intake reservoir IAT sensor. Lysholm compressor IAT sensor. ECT sensor. FTP sensor. MAP sensor. EGR valve position sensor. TP sensor. Right rear and left rear HO2S. If any other DTCs are not present, repair open reference voltage circuit between PCM and suspect sensor. See WIRING DIAGRAMS article.
11. Turn ignition off. Disconnect scan tool. Disconnect suspect sensor connector. Ensure PCM is disconnected. Measure resistance in Black/Yellow wire between suspect sensor harness connector and PCM harness connector terminal No. 3AB. (Scheme 35) See WIRING DIAGRAMS article. If resistance is less than 5 ohms, reconnect suspect sensor connector and go to next step. If resistance is 5 ohms or more, repair open Black/Yellow wire.
12. Check resistance between negative battery terminal and PCM harness connector terminals 4AB (Black wire), 4AF (Black wire), 4AJ (Black wire) and 4AN (Black wire), individually. (Scheme 35) See WIRING DIAGRAMS article. If all circuits have a resistance of less than 5 ohms, go to next step. If any circuit has a resistance of 5 ohms or more, repair open wire.
13. Check resistance of Black/Yellow wire between each sensor harness connector listed in step 10 and PCM harness connector terminal No. 3AB. If resistance is less than 5 ohms at all sensors, ground circuits are okay. If resistance is 5 ohms or more at any sensor, recheck reference voltage. If reference voltage is still not 4-6 volts, replace PCM. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
14. Turn ignition off. Disconnect appropriate PCM connector. PCM is mounted in front of center console, under radio. Ensure TP sensor, EGR valve position sensor, MAP sensor and FTP sensor connectors are disconnected. Ensure any other suspect sensor is disconnected. Turn ignition on. Measure voltage between TP sensor terminal "A" (Light Green/Red wire) and negative battery terminal. If 5 volts or more is present, repair short to power. See WIRING DIAGRAMS article. If less than 5 volts is present, recheck reference voltage. If reference voltage is still not 4-6 volts, replace PCM. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

Scheme 35