Inspection Procedure 12: The hood latch switch signal is not received.
| caution | Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal. |
COMMENTS ON TROUBLE SYMPTOM
PROBABLE CAUSES
- Malfunction of hood latch switch
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check the installation condition.
Q.
Is the check result normal?
STEP 2. Connector check: A-49 hood latch switch connector
Q.
Is the check result normal?
STEP 3. hood latch switch check
Q.
Is the check result normal?
STEP 4. Resistance measurement at the A-49 hood latch switch connector
| (1)Disconnect the connector, and measure at the wiring harness side. |
| (2)Measure the resistance between the A-49 hood latch switch connector terminal No. 1 and the body earth. OK: Continuity exists (2 Ω or less) |
Q.
Is the check result normal?
STEP 5. Wiring harness check between the A-49 hood latch switch connector terminal No. 1 and the body earth
- Check the earth wires for open circuit.
Q.
Is the check result normal?
STEP 6. Connector check: C-410 ETACS-ECU connector
Q.
Is the check result normal?
STEP 7. Wiring harness check between the A-49 hood latch switch connector terminal No. 2 and the C-410 ETACS-ECU connector terminal No. 12
Q.
Is the check result normal?
STEP 8. M.U.T.-III data list
- Open the hood.
|
Q.
Is the check result normal?