Inspection Procedure 15: 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.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

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. hood latch switch check



Q. Is the check result normal?





STEP 3. Resistance measurement at hood latch switch connector (earth terminal)


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the hood latch switch connector (earth terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 4. Check of open circuit in earth line between hood latch switch connector and body earth


Q. Is the check result normal?





STEP 5. Check of open circuit in HOOD line between hood latch switch connector and body earth


Q. Is the check result normal?





STEP 6. M.U.T.-III data list




  • Open the hood.
Item No.
 Item name
 Normal conditions
Item 266
 Hood latch switch
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?