OPERATION
- Battery voltage is applied to diagnosis connector (terminal No.16).
- Diagnosis connector (terminals No. 4 and 5) are earthed to the vehicle body.
COMMENT ON TROUBLE SYMPTOM
- Failure is possibly caused by failed power supply circuit or failed earthing circuit of diagnosis connector.
PROBABLE CAUSE
- Failed diagnosis connector
- Open/short circuit in diagnosis connector circuit
- Failed MUT-II/III
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Q: Is the check result normal?
YES:
Go to Step 2 
.NO: Repair.
- Disconnect connector, and measure at harness side.
- Resistance between terminal No. 4 and earth, also between terminal No. 5 and earth.
OK: 2 Ω
or less
Q: Is the check result normal?
YES:
Go to Step 3 .NO:
- Check and repair harness between C-24 (terminal No. 4) diagnosis connector and body earth, also between C-24 (terminal No. 5) diagnosis connector and body earth.
- Check earthing line for open circuit and damage.
- Disconnect connector, and measure at the harness side.
- Voltage between terminal No. 16 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 4 .NO:
- Check intermediate connectors A-14 <RHD>, C-116 <LHD>, C-125 <RHD>, C-204 and C-205, and repair if necessary. If connectors are normal, check and repair harness between C-24 (terminal No. 16) diagnosis connector and battery.
- Check power supply line for open/short circuit.
NOTE: Before checking harness, check intermediate connectors A-14 <RHD>, C-116 <LHD>,
C-125 <RHD>, C-204 and C-205, and repair if necessary.
- Check power supply line for damage.
Q: Is the check result normal?
YES:
- Check and repair harness between C-24 (terminal No. 4) diagnosis connector and body earth, also between C-24 (terminal No. 5) diagnosis connector and body earth.
- Check earthing line for damage.