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Malfunction Indicator Light (MIL) Stays On Or Comes On After 2 Seconds

WARNING: This page is about a different car, the 2000 Honda Prelude. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: MIL will stay on when no DTC is stored, SCS Service Connector is connected to 2-pin service check connector and ignition is on. See Fig 1 .
  1. If symptom is intermittent, check for:
    • Loose No. 4 ACG-S (10-amp) fuse located in underdash fuse/relay box.
    • Loose No. 23 FUEL PUMP (15-amp) fuse located in underdash fuse/relay box.
    • Intermittent short in Red/White wire between PCM 31-pin connector "C" terminal No. 7 and 2-pin service check connector located at right side of center console behind access cover. See Figure .
    • Intermittent short in Gray/Red wire between PCM 32-pin connector "A" terminal No. 18 and instrument panel 16-pin Blue connector "B" terminal No. 16. See Figure . See WIRING DIAGRAMS in INSTRUMENT PANELS - PRELUDE article in ACCESSORIES & EQUIPMENT.
    • 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 and TP sensor, EGR valve lift sensor and/or Fuel Tank Pressure (FTP) sensor. See appropriate wiring diagram in WIRING DIAGRAMS article.
    • 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 Data Link 16-pin Connector (DLC) located at right side of center console behind access cover. See Figure . Turn ignition on. Read 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 Diagnostic Trouble Code (DTC) test. If DTCs are not present, go to next step.
    NOTE: Open or short in Light Green wire between PCM 31-pin connector "C" terminal No. 8 and DLC terminal No. 15 will keep scan tool from communicating with PCM. See Figure and Figure . If this occurs, go to next step.
  3. Turn ignition off. Connect SCS Service Connector to 2-pin service check connector. See Fig 1 . Turn ignition on. If MIL indicates DTCs, repair open or short in Light Green wire between PCM 31-pin connector "C" terminal No. 8 and DLC terminal No. 15. See Figure and Figure . If DTCs are present, go to DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. After identifying DTC, go to appropriate Diagnostic Trouble Code (DTC) test. If MIL does not indicate DTCs, go to next step.
  4. Attempt to start engine. If engine starts, go to next step. If engine does not start, go to step  7 .
  5. Turn engine off and ignition on. Using backprobe set, measure voltage between PCM 31-pin connector "C" terminal No. 7 (Red/White wire) and PCM 16-pin connector "D" terminal No. 11 (Green/Black wire). See Figure and Figure . If about 5.0 volts exists, go to next step. If about 5.0 volts does not exist, repair short in Red/White wire between PCM 31-pin connector "C" terminal No. 7 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, repair short in Gray/Red wire between PCM 32-pin connector "A" terminal No. 18 and MIL. See appropriate wiring diagram in WIRING DIAGRAMS article. If MIL is not on, substitute a known-good PCM and recheck. See SUBSTITUTING PCM under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. If symptom or indication goes away, replace original PCM.
  7. Inspect No. 4 ACG-S (10-amp) fuse located in underdash fuse/relay box. If fuse is okay, go to next step. If fuse is open, repair short in White/Green wire between fuse and PGM-FI main relay. See appropriate wiring diagram in WIRING DIAGRAMS article. Replace fuse.
  8. Inspect No. 23 FUEL PUMP (15-amp) fuse located in SRS fuse block. SRS fuse block is located at left kick panel, above underdash fuse/relay box. If fuse is okay, go to next step. If fuse is open, repair short in Red/Orange wire between fuse and PGM-FI main relay. See appropriate wiring diagram in WIRING DIAGRAMS article. Replace fuse.
  9. Turn ignition on. While observing MIL, 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 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, repair short in Yellow/Red wire between PCM connector terminal No. 4 and MAP sensor, or Yellow/Blue wire between PCM connector terminal No. 10 and TP sensor, EGR valve lift sensor or FTP sensor. See appropriate wiring diagram in WIRING DIAGRAMS article.
  11. Turn ignition off. Disconnect fuel injector connectors and IAC valve connector. Turn ignition on. Using backprobe set, 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 poor connections at PGM-FI main relay or repair open in Yellow/Black wire(s) between PCM 32-pin connector "A" terminal No. 11 or terminal No. 24 and PGM-FI main relay. 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. Using backprobe set, measure voltage between ground and PCM 32-pin connector "A" terminal No. 9 (Brown/Black wire) and terminal No. 22 (Brown/Black wire), individually. See Figure . If voltage is less than one volt, substitute a known-good PCM and recheck. See SUBSTITUTING PCM under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. If symptom or indication goes away, replace original PCM. If voltage for either terminal is one volt or more, repair open in Brown/Black wire between PCM connector terminal No. 9 and/or terminal No. 22 and ground connection G101, located at right side of engine, near VTEC pressure switch. See appropriate wiring diagram in WIRING DIAGRAMS article.
Fig 1: Identifying SCS Service Connector
G99A08685Courtesy of AMERICAN HONDA MOTOR CO., INC.
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