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Home/Mitsubishi/Mirage/Mitsubishi Mirage V (1995-2003)/Repair manual/Testing & Diagnostics/Engine Controls - Self-Diagnostics: Other
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Engine Controls - Self-Diagnostics: Other Mitsubishi Mirage V

Testing & Diagnostics ~2604 words

CIRCUIT TESTS

CAUTIONEnsure ignition switch is in OFF position when performing resistance tests. Perform all resistance and voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm impedance, unless stated otherwise in test procedures.

Note. Some models may use an Engine Control Module (ECM) or a Powertrain Control Module (PCM). In testing procedures and illustrations, the terms may be used interchangeably. For correct application, see WIRING DIAGRAMS article. Engine Control Module (ECM) diagnostic memory is retained by direct power supply from battery. Memory is not erased by turning off ignition, but it will be erased if battery or ECM is disconnected.

Note. For component locations, see REMOVAL, OVERHAUL & INSTALLATION article.

Using scan tool, display and record DTCs. Record freeze frame data. See ENTERING ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. If no DTCs are displayed, see TROUBLE SHOOTING - NO CODES article.

Note. Other Monitor is the only monitor that does not require readiness test.

Go to appropriate DTC test(s). After performing test(s), clear DTCs. When DTCs are cleared, readiness test status will be reset to incomplete. Verify repair by operating vehicle according to OBD-II drive cycle appropriate to repair. See appropriate drive cycle under OBD-II DRIVE CYCLES in SELF-DIAGNOSTICS - INTRODUCTION article. Using scan tool, check readiness test status for monitor related to the drive cycle driven. If drive cycle is properly run and there are no faults, readiness test status will complete. Repair verification is complete. If ECM detects malfunction, OBD-II drive cycle must be run again before readiness test status will go to complete. Regardless of whether a fault exists, readiness test status will complete by second drive cycle. Once readiness test status is complete, check for DTCs.

INTERMITTENT DTCS

This procedure applies if sent here from diagnostic tests. Most intermittent malfunctions occur from vibration, temperature change, moisture change and poor connections. Try to determine under what specific conditions problem occurs. Then try to duplicate those conditions while monitoring circuit suspected of being faulty. Use data recorder function in scan tool. The following additional checks may assist in identifying a possible intermittent problem

  1. Check all pertinent technical service bulletins.
  2. Visually inspect related wiring harness connectors for broken, bent, pushed out or corroded terminals.
  3. Visually inspect related wiring harness for chafed, pierced or partially broken wires.
  4. Wiggle suspected wire(s) or vibrate suspected component.
  5. Manipulate heat and/or humidity to suspected component.

No Communication With All Systems

  1. Check voltage between ground and DLC terminal No. 16. If battery voltage does not exist, check connectors and wiring harness between DLC and power supply. If battery voltage exists, go to next step.
  2. 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 ECM

  1. Check connectors and wiring harness between ECM and DLC and between ECM and power supply. If wiring and connectors are okay, check MFI relay. See RELAYS in SYSTEM & COMPONENT TESTING article. If MFI relay is okay, go to next step.
  2. Remove MFI relay. Check voltage between ground and MFI relay connector terminal No. 3. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between MFI relay and battery.
  3. Check voltage between ground and MFI relay connector terminal No. 4. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between MFI relay and battery.
  4. For Mirage, go to step 9 . On Diamante, disconnect ECM connector B-108 and connector B-109. Turn ignition on. Check voltage between ground and ECM connector terminal No. 20. If battery voltage exists, go to next step. If battery voltage does not exist, check junction connector between MFI relay connector and ECM and wiring harness between ignition switch connector and ECM. If wiring and connectors are okay, check ignition switch.
  5. Check voltage between ground and ECM connector terminal No. 87. If battery voltage exists, go to next step. If battery voltage does not exist, check connectors and wiring harness between ECM and MFI relay.
  6. Check voltage between ground and ECM connector terminal No. 41. If battery voltage exists, go to next step. If battery voltage does not exist, check connectors and wiring harness between ECM and MFI relay.
  7. Turn ignition off. Check continuity between ground and ECM connector terminal No. 42, and ground and terminal No. 48. If continuity exists, go to next step. If continuity does not exist, check connectors and wiring harness between ECM and ground.
  8. Turn ignition on. Check voltage between ground and ECM connector terminal No. 66. If battery voltage exists, check ECM connectors. If ECM connectors are okay, replace ECM and/or TCM. If battery voltage does not exist, check connectors and wiring harness between ECM and battery.
  9. Disconnect ECM connector B-37 and connector B-40. Turn ignition on. Check voltage between ground and ECM connector terminals No. 12 and 25. If battery voltage exists, go to next step. If battery voltage does not exist, check MFI relay connector and ECM and wiring harness between MFI relay connector and ECM.
  10. Turn ignition off. Check continuity between ground and ECM connector terminals No. 13 and 26. If continuity exists, go to next step. If continuity does not exist, check wiring harness between ground and ECM.
  11. Turn ignition on. Check voltage between ground and ECM connector terminal No. 80. If battery voltage exists, check ECM connector. If ECM connector is okay, replace ECM. If battery voltage does not exist, check wiring harness between ECM and battery.

MALFUNCTION INDICATOR LIGHT (MIL)

Note. For terminal identification, see TERMINAL IDENTIFICATION in SELF-DIAGNOSTICS - INTRODUCTION article. For circuit and wire color identification, see WIRING DIAGRAMS article.

MIL Does Not Come On

  1. Using scan tool, read data list item No. 16 (ECM power supply voltage). If battery voltage exists, go to step 10 . If battery voltage does not exist, go to next step.
  2. On Mirage, go to step 7 . Disconnect ECM connector. On Diamante, turn ignition on. Check voltage between ground and ECM connector terminal No. 20. If battery voltage exists, go to next step. If battery voltage does not exist, check junction connector between MFI relay connector and ECM and wiring harness between ignition switch connector and ECM. If wiring and connectors are okay, check ignition switch.
  3. Check voltage between ground and ECM connector terminal No. 87. If battery voltage exists, go to next step. If battery voltage does not exist, check connectors and wiring harness between ECM and MFI relay.
  4. Check voltage between ground and ECM connector terminal No. 41. If battery voltage exists, go to next step. If battery voltage does not exist, check connectors and wiring harness between ECM and MFI relay.
  5. Turn ignition off. Check continuity between ground and ECM connector terminal No. 42, and ground and terminal No. 48. If continuity exists, go to next step. If continuity does not exist, check wire between ECM and ground.
  6. Turn ignition on. Check voltage between ground and ECM connector terminal No. 66. If battery voltage exists, go to step 10 . If battery voltage does not exist, check connectors and wiring harness between ECM and battery.
  7. Disconnect ECM connectors B-37 and B-40. Turn ignition on. Check voltage between ground and ECM connector terminals No. 12 and 25. If battery voltage exists, go to next step. If battery voltage does not exist, check MFI relay connector and ECM and wiring harness between MFI relay connector and ECM.
  8. Turn ignition off. Check continuity between ground and ECM connector terminals No. 13 and 26. If continuity exists, go to next step. If continuity does not exist, check wiring harness between ground and ECM.
  9. Turn ignition on. Check voltage between ground and ECM connector terminal No. 80. If battery voltage exists, check ECM connector. If ECM connector is okay, replace ECM. If battery voltage does not exist, check wiring harness between ECM and battery.
  10. Turn ignition off. Disconnect ECM connector B-108 (Diamante), or ECM connector B-39 (Mirage). Connect jumper wire between ground and ECM connector terminal No. 22 on Diamante, or ECM terminal No. 36 on Mirage. Turn ignition on. If MIL comes on, check ECM connector. If connector is okay, replace ECM. If MIL does not come on, go to next step.
  11. Turn ignition off. Check for open bulb. If bulb is okay, disconnect combination meter connector C03 on Diamante, or connector B07 on Mirage. Turn ignition on. Check voltage between ground and combination meter connector C03 terminal No. 52 on Diamante with normal meter, C03 terminal No. 48 on Diamante with high contrast meter, or Mirage connector B07 terminal No. 42. If battery voltage exists, check junction connectors and wiring harness between combination meter connector and ECM. 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-91119-S39045043022001030200000) under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. If no DTCs are displayed, go to next step. If DTCs are displayed, record all DTCs and go to «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91121-S21513858042002090500000) . After identifying DTCs, go to appropriate test(s) under «DIAGNOSTIC TESTS»(ref-91121-S27987593132001030200000) .
  2. Disconnect ECM connector. Disconnect combination meter connector C11 on Diamante, or B07 on Mirage. Check continuity between ground and combination meter connector C11 terminal No. 63 on Diamante, or connector B07 terminal No. 53 on Mirage. If continuity exists, check wiring harness between combination meter connector and ECM. If continuity does not exist, replace ECM.

Probable Cause

  1. VAF failed.
  2. Open or short in VAF circuit, or loose connector.
  3. ECM failed.
  1. Barometric (BARO) pressure sensor failed.
  2. Open or short in BARO circuit, or loose connector.
  3. Engine Control Module (ECM) failed.
  1. MAP sensor failed.
  2. Open or short in MAP sensor circuit, or loose connector.
  3. Engine Control Module (ECM) failed.
  1. IAT sensor failed.
  2. Open or short in IAT circuit, or loose connector.
  3. ECM failed.
  1. IAT sensor failed.
  2. Open or short in IAT circuit, or loose connector.
  3. Engine Control Module (ECM) failed.
  1. ECT sensor failed.
  2. Open or short in ECT circuit, or loose connector.
  3. Engine Control Module (ECM) failed.
  1. TP sensor failed or misadjusted.
  2. Open or short in TP sensor circuit, or loose connector.
  3. Closed throttle position switch "on" signal malfunction.
  4. Closed throttle position switch signal wire shorted.
  5. Engine Control Module (ECM) failed.
  1. Heated Oxygen Sensor (HO2S) failed.
  2. Injector failed.
  3. Fuel pressure regulator failed.
  4. Fuel pump failed.
  5. Fuel filter blockage.
  6. Air intake malfunction.
  7. Exhaust gas leak.
  8. ECM failed.
  1. HO2S deteriorated.
  2. Open in HO2S output line.
  3. ECM failed.
  1. Open or short in HO2S heater circuit.
  2. Open in HO2S heater.
  3. ECM failed.
  1. Rear HO2S failed.
  2. Open in rear HO2S output line.
  3. ECM failed.
  1. Open or short in rear HO2S circuit.
  2. Open in rear HO2S heater.
  3. ECM failed.
  1. Mirage 1.5L - Manifold Absolute Pressure (MAP) sensor failed.
  2. Diamante & Mirage 1.8L - Volume Airflow (VAF) sensor failed.
  3. Injector failed.
  4. Incorrect fuel pressure.
  5. Intake air leaks.
  6. Heated Oxygen Sensor (HO2S) failed.
  7. Engine Coolant Temperature (ECT) sensor failed.
  8. Intake Air Temperature (IAT) sensor failed.
  9. Diamante & Mirage 1.8L - Barometric Pressure (BARO) sensor failed.
  10. Exhaust system leak.
  11. Poor quality fuel.
  12. ECM failed.
  1. Injector failed.
  2. Open or short in injector circuit, or loose connector.
  3. ECM failed.
  1. Ignition system related part failed.
  2. Poor CKP signal.
  3. Incorrect air-fuel ratio.
  4. Low compression pressure.
  5. Engine Coolant Temperature (ECT) sensor failed.
  6. Timing belt jumped gear.
  7. Injector failed.
  8. EGR valve defective.
  9. ECM failed.
  1. Ignition system related part failed.
  2. Low compression pressure.
  3. Injector failed.
  4. ECM failed.
  1. KS failed.
  2. Open or short in KS circuit, or loose connector.
  3. ECM failed.
  1. CKP sensor failed.
  2. Open or short in CKP sensor circuit, or loose connector.
  3. ECM failed.
  1. CKP sensor failed.
  2. Open or short in CKP sensor circuit, or loose connector.
  3. ECM failed.
  1. EGR valve does not open.
  2. EGR control vacuum is too low.
  3. EGR solenoid failed.
  4. Open or short in EGR solenoid circuit, or loose connector.
  5. Diamante & Mirage 1.8L - Manifold Differential Pressure (MDP) sensor failed.
  6. Mirage 1.5L - Manifold Absolute Pressure (MAP) sensor failed.
  7. ECM failed.
  1. EGR solenoid failed.
  2. Open or short in EGR solenoid circuit, or loose connector.
  3. ECM failed.
  1. Catalytic converter failed.
  2. HO2S failed.
  3. ECM failed.
  1. Catalytic converter deteriorated.
  2. HO2S failed.
  3. Engine Control Module (ECM) failed.
  1. Fuel filler cap improperly tightened or missing.
  2. Fuel vent failed.
  3. Purge line or vapor line blocked.
  4. Leak in fuel tank, purge line or vapor line.
  5. EVAP purge solenoid valve failed.
  6. EVAP vent solenoid valve failed.
  7. Fuel Tank Differential Pressure (FTDP) sensor failed.
  8. Engine Coolant Temperature (ECT) sensor failed.
  9. Intake Air Temperature (IAT) sensor failed.
  10. Power steering pressure switch failed.
  11. Incorrect fuel used.
  12. Improper fuel cap relief pressure.
  13. Leak in EVAP canister.
  14. EVAP canister clogged.
  1. EVAP purge solenoid valve failed.
  2. Open or short in EVAP purge solenoid valve circuit, or loose connector.
  3. ECM failed.
  1. EVAP vent solenoid valve failed.
  2. Open or short in EVAP vent solenoid circuit, or loose connector.
  3. ECM failed.
  1. Fuel Tank Differential Pressure (FTDP) sensor failed.
  2. Open or short in FTDP sensor circuit, or loose connector.
  3. ECM failed.
  4. Fuel vent valve stuck or fuel vapor line blocked.
  1. Fuel filler cap improperly tightened or missing.
  2. Improper fuel cap relief pressure.
  3. Fuel vent failed.
  4. Purge line or vapor line blocked.
  5. Leak in fuel tank, purge line or vapor line.
  6. EVAP purge solenoid valve failed.
  7. EVAP vent solenoid valve failed.
  8. Fuel Tank Differential Pressure (FTDP) sensor failed.
  9. Leak in EVAP canister.
  10. EVAP canister clogged.
  11. Engine Coolant Temperature (ECT) sensor failed.
  12. Intake Air Temperature (IAT) sensor failed.
  13. Power steering pressure switch failed.
  14. Incorrect fuel used.
  1. VSS failed.
  2. Open or short VSS circuit, or loose connector.
  3. ECM failed.
  1. Idle air control motor failed.
  2. Open or short in idle air control motor circuit, or loose connector.
  3. ECM failed.
  1. Closed throttle position switch failed.
  2. Open or short in closed throttle position switch circuit, or loose connector.
  3. ECM failed.
  1. Power steering pressure switch failed.
  2. Open or short in closed throttle position switch circuit, or loose connector.
  3. ECM failed.
  1. Park/neutral position switch failed.
  2. Open or short in park/neutral position switch circuit, or loose connector.
  3. ECM failed.
  1. Transaxle fluid temperature sensor failed.
  2. Open or short in transaxle fluid temperature sensor circuit, or loose connector.
  3. ECM failed.
  1. Input shaft speed sensor failed.
  2. Open or short in input shaft speed sensor circuit, or loose connector.
  3. ECM failed.
  1. Output shaft speed sensor failed.
  2. Open or short in output shaft speed sensor circuit, or loose connector.
  3. ECM failed.
  1. CKP sensor failed.
  2. Open or short in input shaft speed sensor circuit, or loose connector.
  3. ECM failed.
  1. Breakdown of torque converter clutch system and related components.
  2. Open or short in torque converter clutch circuit or loose connector.
  3. ECM failed.
  1. Low-reverse solenoid failed.
  2. Open or short in low-reverse solenoid circuit or loose connector.
  3. ECM failed.
  1. Underdrive solenoid failed.
  2. Open or short in underdrive solenoid circuit, or loose connector.
  3. ECM failed.
  1. Second solenoid failed.
  2. Open or short in second solenoid circuit, or loose connector.
  3. ECM failed.
  1. Overdrive solenoid failed.
  2. Open or short in overdrive solenoid circuit, or loose connector.
  3. ECM failed.
  1. Malfunction of vacuum control solenoid valve.
  2. Open or short in vacuum control solenoid valve circuit, or loose connector.
  3. ECM failed.
  1. Malfunction of ventilation control solenoid valve.
  2. Open or short in ventilation control solenoid valve circuit, or loose connector.
  3. ECM failed.
  1. Manifold Differential Pressure (MDP) sensor failed.
  2. Open or short in MDP sensor circuit, or loose connector.
  3. ECM failed.
  1. Open in generator FR circuit.
  2. ECM failed.
  1. Automatic transaxle control system malfunction.
  2. Communication line failure between ECM and TCM.
  3. TCM failed.
  4. ECM failed.
  1. Automatic transaxle control relay failed.
  2. Open or short in automatic transaxle control relay circuit, or loose connector.
  3. ECM failed.
  1. TP sensor failed.
  2. Open or short TP sensor circuit, or loose connector.
  3. ECM failed.

SUMMARY

If no DTCs (or pending DTCs) are present and driveability symptoms exist proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).

More articles — Engine Controls - Self-Diagnostics