LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 1992 >> Integra GS-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Trouble Codes >> Code 0 Or No Codes >> CHECK ENGINE Light Stays On
April 5, 2026: LEMON Manuals is launched! Read the announcement.

CHECK ENGINE Light Stays On

  1. Check ECU for fault codes. See RETRIEVING CODES  . Service codes as necessary. If no codes are present, start engine. If engine does not start, inspect ECU fuse in underhood fuse/relay box. If fuse is okay, go to step 5). If engine starts, go to step 2).
  2. Turn ignition off. Connect ECU Test Harness (07LAJ-PT3010A ) between ECU and ECU connector. See Figure . Turn ignition on. Measure voltage between terminals D4 (+) and D22 (-). If 5 volts are not present, repair short to body ground between ECU terminal D4 and self-diagnostic connector. If 5 volts are present, connect jumper wire between self-diagnostic connector terminals. Measure voltage between terminals D4 and D22. If 5 volts are present, repair open circuit D4 (Brown) or D22 (Green/White) between ECU and self-diagnostic connector. If 5 volts are not present, go to step 3).
  3. Ensure jumper wire is removed from self-diagnostic connector. Turn ignition off. Disconnect "A" connector from ECU. Turn ignition on. If CHECK ENGINE light goes out, repair short circuit in Green/Orange wire between ECU terminal A13 and CHECK ENGINE light. If CHECK ENGINE light remains on, substitute a known good ECU and repeat test. If symptom is gone, replace original ECU.
  4. Ensure jumper wire is removed from self-diagnostic connector. Inspect fuse No. 24 in under dash fuse/relay box. Replace fuse if necessary. If fuse is okay, turn ignition on. Disconnect 3-wire connector from MAP sensor, throttle angle sensor and EGR valve lift sensor (1.8L). If CHECK ENGINE light goes out, replace sensor that caused light to go out. If CHECK ENGINE light stays on, go to step 5).
  5. Turn ignition off. Connect ECU Test Harness (07LAJ-PT3010A ) between ECU and ECU connector. See Figure . Leave connector "D" disconnected from ECU. Using an ohmmeter, check for continuity between terminals D19 and D20. If continuity is not present, go to next step. If continuity is present, check for short to body ground in the following circuits:
    • D19 (Yellow/Red wire) between ECU and MAP sensor.
    • D20 (Yellow/White wire) between ECU and throttle angle sensor.
  6. Ensure all wiring harness connectors are connected to sensors. Connect "D" connector to ECU. Turn ignition on. Individually measure voltage between body ground and terminals A26 and B2. Refer to Fig. Figure . If voltage is 1.0 volt or more, repair open circuit A26 (Black/Red wire) or B2 (Brown/Black wire). If voltage is less than 1.0 volt, go to step 7).
  7. Measure voltage between terminal A26 (-) and terminals A25 (+) and B1 (+). If battery voltage is not present, check main relay and wiring harness connector. If relay and connector are okay, repair open circuit between ECU terminals A25 and B1 (Yellow/Black wire) and main relay. If battery voltage is present, substitute a known good ECU, and recheck. If problem is corrected, replace ECU.
scientia non olet · About LEMON Manuals