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MIL Stays On

  1. Check ECM for fault codes. See RETRIEVING CODES  under SELF-DIAGNOSTIC SYSTEM. Service codes. If codes are not present, remove jumper wire from self-diagnostic connector. Start engine. If engine does not start, go to step 6). If engine starts, turn ignition off. Connect ECM Test Harness (07LAJ-PT3010A ) between ECM and ECM connectors. See Figure .
  2. Turn ignition on. Measure voltage between test terminals D4 (+) and D22 (-). If about 5 volts (M/T models) or 11 volts (A/T models) are present, go to step 3). If voltage is not about 5 volts (11 volts on A/T models), repair short to body ground in Brown wire between ECM connector terminal D4, Transmission Control Module (TCM), ABS control unit and self-diagnostic connector. See Figure .
  3. Connect jumper wire to self-diagnostic connector. Measure voltage between test terminals D4 and D22. If about 5 volts (11 volts on A/T models) are present, check for open in Brown or Green/White wire between self-diagnostic connector and ECM.
  4. If voltage is not about 5 volts (11 volts on A/T models), remove jumper wire from self-diagnostic connector. Turn ignition off. Disconnect connector "A" of ECM. Turn ignition on.
  5. If MIL is on, repair short to ground in Green/Red wire between terminal A13 and MIL. If MIL is not on, replace ECM and retest.
  6. If engine did not start in step 1), check ECM fuse (10-amp) in underhood fuse/relay box and ECM fuse (15-amp) in underdash fuse box. Replace fuses if necessary. Turn ignition on. Individually disconnect 3-pin connectors on EGR valve lift sensor, MAP sensor and throttle position sensor.
  7. If MIL goes out, replace sensor causing MIL to go out. If MIL is on, connect jumper wire between self-diagnostic connector terminals. Disconnect ignition timing adjuster connector. Check if ECM flashes Code 18. If Code 18 is indicated, replace ignition timing adjuster.
  8. If Code 18 is not indicated, turn ignition off. Remove jumper wire. Connect ECM Test Harness (07LAJ-PT3010A ) between ECM and ECM connectors. See Figure . Disconnect connector "D" from ECM side only. Individually check for continuity between body ground and terminals D19 and D20.
  9. If continuity exists, repair short to body ground in Yellow/White wire between ECM terminal D19 or D20 and MAP sensor, ignition timing adjuster, throttle position sensor or EGR position sensor. If continuity does not exist, reconnect connector "D" and all sensor connectors.
  10. Turn ignition on. Individually measure voltage between ECM terminal A26 (-) and terminals B1 (+) and A25 (+). If battery voltage is not present, repair open in Yellow/Black wire circuit between main relay and ECM terminals A25 and B1. If circuit is okay, check main relay and connector. If battery voltage is present, turn ignition off, replace ECM and retest.
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