OPERATION
- Battery voltage is applied to engine warning lamp of combination meter connector (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 of combination meter connector (terminal No. 14).
COMMENTS ON TROUBLE SYMPTOM
- Engine-A/T-ECU turns on engine warning lamp for 5 seconds to check for burnt-out bulb immediately after ignition switch is turned to ON.
- If engine warning lamp is not lit just after turning ignition switch to "ON" position, failure is possibly caused by burn-out bulb, open/short circuit or other faults.
PROBABLE CAUSE
- Engine warming lamp bulb burnt out
- Failed ignition switch
- Open/short circuit in engine warning lamp circuit or loose connector contact
- Failed engine-A/T-ECU
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Q: Is the check result normal?
YES:
Go to Step 4 
.NO: Repair.
- Disconnect connector, and measure at the harness side.
- Ignition switch: ON
- Voltage between terminal No. 42 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 6 .NO: Go to Step 5
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Q: Is the check result normal?
YES:
- Check intermediate connectors C-203 and C-205, and repair if necessary. If intermediate connectors are normal, check and repair harness between C-04 (terminal No. 42) combination meter connector and C-303 (terminal No. 2) ignition switch connector.
- Check power supply line for open/short circuit.
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Q: Is the check result normal?
YES:
Go to Step 7 .NO: Repair.
- 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 9 .NO:
- Go to Step 8 .
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Q: Is the check result normal?
YES:
- Check intermediate connector C-105, and repair if necessary. If intermediate connector is normal, check and repair harness between C-105 (terminal No. 14) combination meter connector and C-112 (terminal No. 22) engine-A/T-ECU connector.
- Check output line for open/short circuit.
Q: Is the check result normal?
YES:
Go to Step 10 .NO: Repair.
NOTE: Before checking harness, check intermediate connectors C-203 and C-205, and repair if
necessary.
- Check power supply line for damage.
Q: Is the check result normal?
YES:
Go to Step 11 .NO: Repair.
Q: Is the check result normal?
YES:
Go to Step 12 .NO: Repair.
NOTE: Before checking harness, check intermediate connector C-105, and repair if necessary.
- Check output line for damage.
Q: Is the check result normal?
YES:
Go to Step 13 .NO: Repair.