Engine Controls - Tests W/codes - 2.0L Turbo: Other Mitsubishi Eclipse II

Hard Failures

Hard failures cause MIL to come on and remain on until failure is repaired. If MIL comes on and remains on (MIL may flash) during vehicle operation, cause of failure may be determined by using DTCs. See DIAGNOSTIC TROUBLE CODES (DTCS) . If a sensor fails, PCM will use a substitute value in its calculations to continue engine operation. In this condition (limp-in mode), vehicle is functional, but loss of good driveability may result.

Intermittent Failures

Intermittent failures may cause MIL to flicker or come on and go out after intermittent DTC goes away. However, corresponding DTC will be retained in PCM memory. If related DTC does not reoccur within a certain time frame, related DTC will be erased from PCM memory. Intermittent failures may be caused by a sensor, connector or wiring problems. See INTERMITTENTS in TESTS W/O CODES - 2.0L TURBO article.

SERVICE PRECAUTIONS

Before proceeding with diagnosis, following precautions must be observed

1. Ensure vehicle has a fully charged battery and functional charging system.
2. Visually inspect connectors and circuit wiring being worked on.
3. DO NOT disconnect battery or PCM. This will erase any DTCs stored in PCM.
4. DO NOT cause short circuits when performing electrical tests. This will set additional DTCs, making diagnosis of original problem more difficult.
5. DO NOT use a test light in place of a voltmeter.
6. When checking for spark, ensure coil wire is NOT more than 1/4" from chassis ground. If coil wire is more than 1/4" from chassis ground, damage to vehicle electronics and/or PCM may result.
7. DO NOT prolong testing of fuel injectors. Engine may hydrostatically (liquid) lock.
8. When a vehicle has multiple DTCs, always repair lowest number DTC first.

CLEARING DTCS

To clear DTCs using a scan tool, refer to owners manual supplied with scan tool. If scan tool is not available, DTCs may also be cleared by disconnecting negative battery cable or PCM for at least 15 seconds, allowing PCM to clear DTCs. Reconnect negative battery cable and check for DTCs to confirm repair.

DTCS

Note. DTCs can only be retrieved by using a scan tool. DTCs listed below are retrieved using a generic scan tool. DRB III/MUT II scan tool can be used, but it may not read all DTCs. DTCS listed are not used on all vehicles.

DIAGNOSTIC TROUBLE CODE (DTC) INDEX

INTERMITTENT DTCS

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

1. Visually inspect related wiring harness connectors for broken, bent, pushed out or corroded terminals.
2. Visually inspect related wiring harness for chafed, pierced or partially broken wires.
3. Check all pertinent technical service bulletins.

No Communication With All Systems

Check voltage between ground and DLC terminal No. 16. If battery voltage does not exist, check junction connectors and wiring harness between DLC and power supply. If battery voltage exists, check continuity between ground and DLC terminal No. 4, and between ground and terminal No. 5. If continuity exists, replace scan tool. If continuity does not exist, check wiring harness between ground and DLC.

No Communication With PCM

1. Check junction connectors and wiring harness between PCM and DLC and between PCM and power supply. If wiring and connectors are okay, check MFI relay. See RELAYS in «SYSTEM/COMPONENT TESTS - 2.0L TURBO»(ref-19155) article. If MFI relay is okay on non-turbo engine, go to step 4). On turbo engine, disconnect PCM connector. Turn ignition on. Check voltage between ground and PCM connector terminal No. 82 (Black/White wire).
2. If battery voltage exists, go to step 4). If battery voltage does not exist, check junction connector between MFI relay connector and PCM and wiring harness between ignition switch connector and PCM. If wiring and connectors are okay, disconnect ignition switch connector.
3. With ignition switch in ACC position, check for continuity between ignition switch terminals No. 1 and 6. With ignition switch in ON position, check for continuity between terminals No. 1 and 2, 1 and 4, and 1 and 6. With ignition switch in START position, check for continuity between terminals No. 1 and 2, 1 and 3, and 1 and 5. If continuity is not as specified, replace ignition switch.
4. Check voltage between ground and PCM connector terminal No. 38 (Blue/Green wire). If battery voltage exists, ground terminal No. 38 and check voltage between ground and PCM connector terminals No. 12 (Black/Red wire) and No. 25 (Black/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check MFI relay connector and PCM and wiring harness between MFI relay connector and PCM.
5. Check continuity between ground and PCM connector terminals No. 13 (Black wire) and No. 26 (Black wire). If continuity exists, go to next step. If continuity does not exist, check wiring harness between ground and PCM.
6. Check voltage between ground and PCM connector terminal No. 80 (Red/Blue wire). If battery voltage exists, check PCM connector. If PCM connector is okay, replace PCM. If battery voltage does not exist, check wiring harness between PCM and battery.

MIL Does Not Come On

1. Using scan tool in MUT II mode, read SERVICE DATA No. 16 (PCM power supply voltage). If battery voltage exists, go to step 7). If battery voltage does not exist, check MFI relay. See RELAYS in «SYSTEM/COMPONENT TESTS - 2.0L TURBO»(ref-19155) article. If MFI relay is okay on non-turbo engine, go to step 4). On turbo engine, disconnect PCM connector. Turn ignition on. Check voltage between ground and PCM connector terminal No. 82 (Black/White wire).
2. If battery voltage exists, go to step 4). If battery voltage does not exist, check junction connector between MFI relay connector and PCM and wiring harness between ignition switch connector and PCM. If wiring and connectors are okay, disconnect ignition switch connector.
3. With ignition switch in ACC position, check for continuity between ignition switch terminals No. 1 and 6. With ignition switch in ON position, check for continuity between terminals No. 1 and 2, 1 and 4, and 1 and 6. With ignition switch in START position, check for continuity between terminals No. 1 and 2, 1 and 3, and 1 and 5. If continuity is not as specified, replace ignition switch.
4. Check voltage between ground and PCM connector terminal No. 38 (Blue/Green wire). If battery voltage exists, ground terminal No. 38 and check voltage between ground and PCM connector terminals No. 12 (Black/Red wire) and No. 25 (Black/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check MFI relay connector and PCM and wiring harness between MFI relay connector and PCM.
5. Check continuity between ground and PCM connector terminals No. 13 (Black wire) and No. 26 (Black wire). If continuity exists, go to next step. If continuity does not exist, check wiring harness between ground and PCM.
6. Check voltage between ground and PCM connector terminal No. 80 (Red/Blue wire). If battery voltage exists, check PCM connector. If PCM connector is okay, replace PCM. If battery voltage does not exist, check wiring harness between PCM and battery.
7. Turn ignition off. Disconnect PCM connector. Connect jumper wire between ground and PCM connector terminal No. 36 (Green/Red wire).
8. Turn ignition on. If MIL comes on, check PCM connector. If PCM connector is okay, replace PCM. If MIL does not come on, check for open bulb. If bulb is okay, go to next step.
9. Disconnect instrument panel connector C06. Turn ignition on. Check voltage between ground and instrument panel connector C06 or D02 terminal No. 10 (Black/White wire). If battery voltage exists, check junction connectors and wiring harness between instrument panel connector and PCM. If battery voltage does not exist, check power supply circuit to MIL.

Malfunction Indicator Light (MIL) Stays On

1. Using scan tool, check for stored DTCs. See «ENTERING ON-BOARD DIAGNOSTICS»(ref-19156-S39165049742001010800000) under SELF-DIAGNOSTIC SYSTEM. If no DTCs are displayed, go to next step. If DTCs are displayed, record all DTCs and go to appropriate tests.
2. Disconnect PCM connector. Disconnect instrument panel connector C04. Check continuity between ground and instrument panel connector C04 terminal No. 51 (Green/Red wire) or D02 terminal No. 28 (Light Green/Red wire). If continuity exists, check wiring harness between instrument panel connector and PCM. If continuity does not exist, replace PCM.

SUMMARY

If no hard DTCs (or only pass DTCs) are present, driveability symptoms exist, or intermittent DTCs exist, proceed to TESTS W/O CODES - 2.0L TURBO article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.

Wiring Diagram (Eclipse 2.0L Turbo - 1 Of 2). Scheme 15

Wiring Diagram (Eclipse 2.0L Turbo - 2 Of 2). Scheme 16