[13B] MULTIPORT FUEL INJECTION (MPI) <4G64> - - TROUBLESHOOTING - SYMPTOM PROCEDURES - Inspection Procedure 4: The Engine Warning Lamp Remains Illuminating and Never goes out. | PRINT PAGE / INDEX / PRIOR / NEXT

Inspection Procedure 4: The Engine Warning Lamp Remains Illuminating and Never goes out.
OPERATION Battery voltage is applied to engine warning lamp (terminal No. 42) from ignition switch. Engine-A/T-ECU (terminal No. 22) makes power transistor in unit be in "ON" position, and that makes currents go on engine warning lamp (terminal No. 14).
COMMENT ON TROUBLE SYMPTOM Engine-A/T-ECU has detected failed sensor or failed actuator. Or failure is possibly caused by short circuit or other faults.
PROBABLE CAUSE Short circuit in between engine warning lamp and engine-A/T-ECU circuit Failed engine-A/T-ECU
| DIAGNOSIS PROCEDURE
| STEP 1: MUT-II/III diagnosis code Q: Diagnosis code set? YES: Inspection chart for diagnosis code (Refer to ). NO: Go to Step 2 .
| STEP 2: Connector check: C-112 engine-A/T-ECU connector
| Q: Is the check result normal? YES: Go to Step 3 . NO: Repair.
| STEP 3: Perform voltage measurement at C-112 engine-A/T-ECU connector.
| Disconnect connector, and measure at the harness side. Ignition switch: ON Voltage between terminal No. 22 and earth. OK: System voltage Q: Is the check result normal? YES: Go to Step 4. NO: Check intermediate connector C-105, and repair if necessary. If intermediate connector is normal, check and repair harness between C-05 (terminal No. 14) combination meter connector and C-112 (terminal No. 22) engine-A/T-ECU connector. Check output line for short circuit.
| STEP 4: Check the trouble symptoms. Q: Does trouble symptom persist? YES: Replace engine-A/T-ECU. NO: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).

[13B] MULTIPORT FUEL INJECTION (MPI) <4G64> - - TROUBLESHOOTING - SYMPTOM PROCEDURES - Inspection Procedure 4: The Engine Warning Lamp Remains Illuminating and Never goes out. | PRINT PAGE / INDEX / PRIOR / NEXT

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