Inspection Procedure C-2: The Ignition Switch (ACC) Signal is not Received.


caution Whenever the ECU is replaced, ensure that the input signal circuit is normal.


COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-219 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 2.

Repair the defective connector.

STEP 2. Voltage measurement at the C-219 ETACS-ECU connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ACC" position.

(3)Voltage between C-219 ETACS-ECU connector terminal No.74 and body earth
OK: System voltage

Q. Is the check result normal?

Go to Step 4.

Go to Step 3.

STEP 3. Check the wiring harness between C-219 ETACS-ECU connector terminal No.74 and the ignition switch (ACC).





note Prior to the wiring harness inspection, check joint connector C-127, junction block connectors C-207 and C-208, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

STEP 4. M.U.T.-III data list
Check the input signals from the ignition switch (ACC).

  • Turn the ignition switch to the "ACC" position.
Item No.
 Item name
 Normal condition
29
 Ignition switch(ACC)
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.