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Malfunction Indicator Light (MIL) Stays On Or Comes On After 2 Seconds (D16Y5 M/T)

WARNING: This page is about a different car, the 2000 Honda Civic. However, it is still accessible from the selected car via links, so may be relevant.
  1. If symptom is intermittent, check for:
    • Loose No. 44 FI E/M (15-amp) fuse located in underhood fuse/relay box.
    • Loose No. 13 FUEL PUMP (15-amp) fuse located in underdash fuse/relay box.
    • Intermittent short in Brown wire between PCM 31-pin connector "C" terminal No. 7 and service check connector. See Figure. See appropriate wiring diagram in WIRING DIAGRAMS article.
    • Intermittent short in Green/Orange wire between PCM 32-pin connector "A" terminal No. 18 and gauge assembly. See Figure. See appropriate wiring diagram in WIRING DIAGRAMS article.
    • Intermittent short in Yellow/Red wire between PCM 16-pin connector "D" terminal No. 4 and MAP sensor. See Figure. See appropriate wiring diagram in WIRING DIAGRAMS article.
    • Intermittent short in Yellow/Blue wire between PCM 16-pin connector "D" terminal No. 10, TP sensor, EGR valve lift sensor (if equipped) and/or fuel tank pressure sensor.
    • Faulty PGM-FI main relay.

    Perform repairs as necessary and recheck MIL operation. If no problems are found, go to next step.

  2. Connect scan tool to DLC connector. Turn ignition on. Read Diagnostic Trouble Codes (DTCs). See RETRIEVING DIAGNOSTIC TROUBLE CODES in SELF-DIAGNOSTICS - INTRODUCTION article. If DTCs are present, go to DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. After identifying DTC, go to appropriate DTC test. If DTCs are not present, go to next step.
  3. Turn ignition off. Connect SCS service connector to service check connector. See SELF-DIAGNOSTICS - INTRODUCTION article. Turn ignition on. Using MIL read DTCs. If DTCs are not present using MIL, go to step. If DTCs are present using MIL, check for open or short in wire between PCM 31-pin connector "C" terminal No. 8 (Light Blue wire) and DLC terminal No. 15 (Blue/Yellow wire). See Figure and Figure . If wire is okay, go to DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table.
  4. Attempt to start engine. If engine starts, go to next step. If engine does not start, go to step  7.
  5. Turn ignition off. Disconnect SCS service connector. Turn ignition on. Using backprobe set, measure voltage between ground and PCM 31-pin connector "C" terminal No. 7 (Brown wire). See Figure. If about 5.0 volts exists, go to next step. If about 5.0 volts does not exist, check for short to ground in Brown wire between PCM 31-pin connector "C" and service check connector. See appropriate wiring diagram in WIRING DIAGRAMS article.
  6. Turn ignition off. Disconnect PCM 32-pin connector "A". Turn ignition on. If MIL is on, check for short to ground in Green/Orange wire between PCM 32-pin connector "A" terminal No. 18 and MIL. See Figure. See appropriate wiring diagram in WIRING DIAGRAMS article. If MIL is not on, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.
  7. Inspect No. 44 FI E/M (15-amp) fuse located in underhood fuse/relay box. If fuse is okay, go to next step. If fuse is open, check for short in White/Black wire between fuse and PGM-FI main relay. See appropriate wiring diagram in WIRING DIAGRAMS article. Replace No. 44 FI E/M (15-amp) fuse.
  8. Inspect No. 13 FUEL PUMP (15-amp) fuse, located in underdash fuse/relay box. If fuse is okay, go to next step. If fuse is open, check for short in Yellow/Green wire between fuse and PGM-FI main relay. See appropriate wiring diagram in WIRING DIAGRAMS article. Replace No. 13 FUEL PUMP (15-amp) fuse.
  9. Turn ignition on. While observing MIL, disconnect 3-pin connector from Manifold Absolute Pressure (MAP) sensor, Throttle Position (TP) sensor and EGR valve lift sensor, one at a time. If MIL does not go off, go to next step. If MIL goes off, replace sensor that caused MIL to go off.
  10. Turn ignition off. Disconnect PCM 16-pin connector "D". Check for continuity between ground and PCM 16-pin connector "D" terminal No. 4 (Yellow/Red wire) and terminal No. 10 (Yellow/Blue wire), individually. See Figure. If continuity does not exist, go to next step. If continuity exists, check for short to ground in Yellow/Red wire between PCM 16-pin connector "D" terminal No. 4 and MAP sensor, or Yellow/Blue wire between PCM connector terminal No. 10 and TP sensor and EGR valve lift sensor. See appropriate wiring diagram in WIRING DIAGRAMS article.
  11. Turn ignition off. Disconnect fuel injectors connectors and IAC valve connector. Turn ignition on. Measure voltage between ground and PCM 32-pin connector "A" terminal No. 11 (Yellow/Black wire) and terminal No. 24 (Yellow/Black wire), individually. See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, check for open in suspect wire between PCM 32-pin connector "A" and PGM-FI main relay. If wires are okay, check for poor connections or loose wires at PGM-FI main relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If connections and wires are okay, check PGM-FI main relay. See RELAYS under RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING article.
  12. Turn ignition off and reconnect all sensor connectors. Reconnect PCM 16-pin connector "D". Turn ignition on. Measure voltage between ground and PCM 32-pin connector "A" terminal No. 9 (Brown/Black wire) and terminal No. 22 (Brown/Black wire), individually. If less than one volt exists, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM. If one volt or more exists, check for open in suspect wire(s) between PCM 32-pin connector "A" and ground connection, located at thermostat housing. See appropriate wiring diagram in WIRING DIAGRAMS article.
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