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MIL Stays On

  1. Check ECM for fault codes. See RETRIEVING CODES  under SELF-DIAGNOSTIC SYSTEMS. Service codes as necessary. If no codes are present, remove jumper from service connector and start engine. If engine starts, go to step 2. If engine does not start, inspect ECM fuse in underhood fuse/relay box. If fuse is okay, go to step 4.
  2. Turn ignition off. Connect ECM Test Harness (07LAJ-PT3010A ) between ECM and ECM connectors. See Figure . Turn ignition on. Measure voltage between terminals D4 (+) and D22 (-). If voltage is not 5 volts, repair short to body ground between ECM terminal D4 and self-diagnostic connector. If 5 volts are present, connect jumper wire between self-diagnostic connector terminals. Measure voltage between terminals D4 and D22. If 5 volts are present, repair open circuit D4 (Brown wire) or D22 (Green/White wire) between ECM and self-diagnostic connector. If voltage is not 5 volts, go to step 3.
  3. Ensure jumper wire is removed from self-diagnostic connector. Turn ignition off. Disconnect connector "A" from ECM. Turn ignition on. If MIL goes out, repair short circuit in Green/Orange wire between ECM terminal A13 and MIL. If MIL remains on, replace ECM and retest.
  4. Ensure jumper wire is removed from self-diagnostic connector. Inspect fuse No. 24 in underdash fuse/relay box. Replace fuse if necessary. If fuse is okay, turn ignition on. Disconnect 3-pin connectors from MAP sensor, throttle position sensor and EGR valve lift sensor (1.8L). If MIL goes out, replace sensor that caused light to go out. If MIL stays on, go to step 5.
  5. Turn ignition off. Connect ECM Test Harness (07LAJ-PT3010A ) between ECM and ECM connectors. See Figure . Leave connector "D" disconnected from ECM. Using an ohmmeter, check for continuity between terminals D19 and D20. If continuity is not present, go to next step. If continuity is present, check for short to body ground in following circuits:
    • D19 (Yellow/Red wire) between ECM and MAP sensor.
    • D20 (Yellow/White wire) between ECM and throttle position sensor.
    • D20 (Yellow/White wire) between ECM and EGR valve lift sensor (1.8L A/T).
  6. Ensure all wiring harness connectors are connected to sensors. Connect connector "D" to ECM. Turn ignition on. Individually measure voltage between body ground and terminals A26 and B2. See Figure . If voltage is one volt or more, repair open circuit A26 (Black/Red wire) or B2 (Brown/Black wire). If voltage is less than one volt, go to step 7.
  7. Measure voltage between terminal A26 (-) and terminals A25 (+) and B1 (+). If battery voltage is not present, check main relay and wiring harness connector. If relay and connector are okay, repair open circuit between ECM terminals A25 and B1 (Yellow/Black wire) and main relay. If battery voltage is present, replace ECM and retest.
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