Inspection Procedure 19: The hazard indicator assembly (ECO mode 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 hazard indicator assembly (ECO mode switch)
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Check the hazard indicator assembly (ECO mode switch).



Q. Is the check result normal?





STEP 2. Resistance measurement at hazard indicator assembly (ECO mode switch) connector (earth terminal)


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

Q. Is the check result normal?





STEP 3. Check of open circuit in earth line between hazard indicator assembly (ECO mode switch) connector and body earth


Q. Is the check result normal?





STEP 4. Check of short to power supply, and open circuit in FIOS line between hazard indicator assembly (ECO mode switch) connector and ETACS-ECU connector


Q. Is the check result normal?





STEP 5. M.U.T.-III data list




  • When the ECO mode switch is pressed.
Item No.
 Item name
 Normal condition
Item 408
 Filler lid Open SW/ECO mode SW
 ON

  • When the ECO mode switch is not pressed.
Item No.
 Item name
 Normal condition
Item 408
 Filler lid Open SW/ECO mode SW
 OFF
OK: Normal condition is displayed.

Q. Is the check result normal?