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).
COMMENTS 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
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Q: Is the check result normal?
YES:
Go to Step 3 
.NO: Repair.
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- 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.