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Malfunction Indicator Light (MIL) Never Comes On, Even For 2 Seconds, After Ignition Is Turned On (Except 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. 25 METER (7.5-amp) fuse located in underdash fuse/relay box.
    • 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 Yellow/Red wire between PCM 31-pin connector "C" terminal No. 19 and MAP sensor. See Figure. See appropriate wiring diagram in WIRING DIAGRAMS article.
    • Intermittent short in Yellow/Blue wire between PCM 31-pin connector "C" terminal No. 28, 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. Turn ignition on. If low oil pressure light is on, go to next step. If low oil pressure light is not on, replace No. 25 METER (7.5-amp) fuse. Check for short or open in Yellow wire between No. 25 METER (7.5-amp) fuse and gauge assembly. See appropriate wiring diagram in WIRING DIAGRAMS article.
  3. Try to start engine. If engine does not start, go to step  5. If engine starts, go to next step.
  4. Turn ignition off. Using backprobe set, connect a fused jumper wire between ground and PCM 32-pin connector "A" terminal No. 18 (Green/Orange wire). See Figure. Turn ignition on. If MIL comes on, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM. If MIL does not come on, replace MIL bulb and/or check for open in Green/Orange wire between PCM 32-pin connector "A" and gauge assembly. See appropriate wiring diagram in WIRING DIAGRAMS article.
  5. Turn ignition off. Check 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 blown, check for short in White/Black wire between No. 44 FI E/M (15-amp) fuse and PGM-FI main relay. Replace No. 44 FI E/M (15-amp) fuse.
  6. Check No. 13 FUEL PUMP (15-amp) fuse located in underdash fuse/relay box. If fuse is okay, go to next step. If fuse is blown, check for short in Yellow/Green wire between No. 13 FUEL PUMP (15-amp) fuse and PGM-FI main relay. Replace No. 13 FUEL PUMP (15-amp) fuse.
  7. Disconnect fuel injector connectors and IAC valve connector. Turn ignition on. Using backprobe set, measure voltage between ground and PCM 25-pin connector "B" terminal No. 1 (Yellow/Black wire) and terminal No. 9 (Yellow/Black wire), individually. If battery voltage exists, go to next step. If battery voltage does not exist, check for open in suspect wire between PCM 25-pin connector "B" and PGM-FI main relay. See Figure. 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.
  8. Reconnect fuel injector connectors and IAC valve connector. Using backprobe set, measure voltage between ground and PCM 25-pin connector "B" terminal No. 2 (Black wire), No. 10 (Black wire), No. 20 (Brown/Black wire) and terminal No. 22 (Brown/Black wire), individually. If less than one volt exists, go to next step. If one volt or more exists, check for open in suspect wire between PCM 25-pin connector "B" and ground connection, located at left side of intake manifold. See appropriate wiring diagram in WIRING DIAGRAMS article.
  9. Using backprobe set, measure voltage between ground and PCM 31-pin connector "C" terminal No. 19 (Yellow/Red wire) and terminal No. 28 (Yellow/Blue wire), individually. See Figure. If about 5 volts exists, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM. If about 5 volts does not exist, go to next step.
  10. While measuring voltage between ground and PCM 31-pin connector "C" terminal No. 19 (Yellow/Red wire) and terminal No. 28 (Yellow/Blue wire) individually, disconnect 3-pin connector from Manifold Absolute Pressure (MAP) sensor, Throttle Position (TP) sensor, EGR valve lift sensor and Fuel Tank Pressure (FTP) sensor, one at a time. If about 5 volts does not exist, repair short in suspect wire between MAP, TP, EGR valve or FTP sensor and PCM 31-pin connector "C". If about 5 volts exists, replace sensor that caused about 5 volts.
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