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Malfunction Indicator Light (Mil) Inoperative

WARNING: This page is about a different car, the 2000 Isuzu Rodeo and 2000 Isuzu Amigo. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD-II) System Check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Attempt to start engine. If engine does not start, go to step  6. If engine starts, go to next step.
  3. Check METER fuse (15-amp) located in underdash fuse/relay block. If fuse is okay, go to next step. If fuse is blown, go to step  16.
  4. Turn ignition on. Using test light connected to ground, probe ignition feed circuit for MIL at instrument cluster (Yellow wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  13.
  5. Turn ignition off. Disconnect PCM electrical connectors. Connect a jumper wire between ground and MIL control circuit at PCM 32-pin Red connector terminal A13 (White/Green wire). Turn ignition on. If MIL comes on, go to step  10. If MIL does not come on, go to step  11.
  6. Check ENGINE fuse (15-amp) located in underdash fuse/relay block. Check ECM fuse (15-amp) in underhood fuse/relay block. If fuses are okay, go to next step. If fuses are blown, go to step  15.
  7. Turn ignition off. Disconnect PCM electrical connectors. Turn ignition on. Using test light connected to ground, probe ignition feed circuits at PCM 32-pin White connector terminals E16 and F16 (Red/Blue wires). If test light illuminates, go to next step. If test light does not illuminate, go to step  12.
  8. Using test light connected to ground, probe battery feed circuit at PCM 32-pin Red connector terminal A4 (Red/White wire). If test light does not illuminate, go to step  14. If test light illuminates, go to next step.
  9. Check for faulty PCM ground connections. Repair as necessary. Retest system. If connections are okay, go to next step.
  10. Check PCM connectors for damaged terminals. If any terminals are damaged, repair terminals as necessary. Retest system. If PCM connector terminals are okay, go to step  17.
  11. Check for an open in MIL control circuit (White/Green wire) between PCM and MIL. Repair as necessary. Retest system. If circuit is okay, go to step  18.
  12. Substitute PCM main relay with a known-good relay. PCM main relay is located in underhood fuse/relay block. Observe MIL. If MIL operates properly, replace PCM main relay. Retest system. If MIL still does not operate, go to next step.
  13. Repair open in ignition feed circuit (Black/Yellow wire) between PCM main relay and underdash fuse/relay block. Retest system.
  14. Repair open in PCM battery feed circuit (Red/White wire) between PCM and underhood fuse/relay block. Retest system.
  15. Repair short to ground in PCM ignition feed circuit (Black/Yellow or Red/Blue wire) or PCM battery feed circuit (Red/White wire). See appropriate wiring diagram in SYSTEM WIRING DIAGRAMS article. Retest system. Replace fuse.
  16. Repair the short to ground in ignition feed circuit (Yellow wire) between instrument cluster and underdash fuse/relay block. Retest system. Replace fuse.
  17. Replace and reprogram PCM. See PROGRAMMING . Verify proper system operation. Retest system.
  18. Check MIL driver circuit (White/Green wire) for poor connection at instrument cluster connector. Repair as necessary. Retest system. If no problem is found, diagnose problem in instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
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