Inspection Procedure C-3: The Ignition Switch (IG1) Signal is not Received.


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


COMMENTS ON TROUBLE SYMPTOM


Input signal from the ignition switch (IG1) is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

PROBABLE CAUSES



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 "ON" position.

(3)Voltage between C-219 ETACS-ECU connector terminal No.68 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.68 and the ignition switch (IG1).





note
Prior to the wiring harness inspection, check joint connector C-132, junction block connectors C-207 and C-209, 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 signal from the ignition switch (IG1).

  • Turn the ignition switch to the "ON" position.
Item No.
 Item name
 Normal condition
30
 Ignition switch(IG1)
 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.