Inspection Procedure 2: The ignition switch (IG1) 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
If there is an error to the ignition switch (IG1) input signal, or the IG relay inside the ETACS-ECU does not operate, the ignition switch (IG1) signal is no longer output to the communication line.
STEP 2. Voltage measurement at the C-317 ETACS-ECU connector.
(1)Disconnect the connector, and measure at the ETACS-ECU side.
(2)Turn the ignition switch to the ON position.
(3)Measure the voltage between the C-317 ETACS-ECU connector terminal No. 6 and the body earth. OK: Battery voltage
Q.
Is the check result normal?
Go to Step 4.
Go to Step 3.
STEP 3. Wiring harness check between the C-317 ETACS-ECU connector terminal No. 6 and the ignition switch (IG1)
Check the power supply (IG1) 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
Turn the ignition switch to the ON position.
Item No.
Item name
Normal condition
Item 254
IG voltage
Battery voltage
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 ).
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)
Go to Step 2.
Repair the defective connector.
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