STEP 1. Fusible link check: Check the fusible link No.4.
STEP 2. Resistance measurement at ASC-ECU connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Disconnect the fusible link No.4.
(3) Resistance between the +BV terminal and the body ground.OK: No continuity
Is the check result normal?
Replace the fusible link No.4. The short circuit may be present in the power supply circuit. Repair the wiring harness between the ASC-ECU connector +BV terminal and the fusible link, and then replace the fusible link No.4.
STEP 3. Voltage measurement at the ASC-ECU connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between the +BV terminal and the body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage)
Is the check result normal?
Go to Step 4. The open circuit may be present in the power supply circuit. Repair the wiring harness between the ASC-ECU connector +BV terminal and the fusible link No.4.
STEP 4. Voltage measurement at the ASC-ECU connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between ASC-ECU connector (IG1 terminal) and body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage)
Is the check result normal?
Go to Step 6. Go to Step 5.
STEP 5. Check of short to power supply, short to ground, and open circuit in IG1 line between ETACS-ECU and ASC-ECU connector.
STEP 6. Resistance measurement at ASC-ECU connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance between the ASC-ECU connector (GND1 terminal) and the body ground, and between the ASC-ECU connector (GND2 terminal) and the body groundOK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 8. Go to Step 7.
STEP 7. Check of open circuit in GND1, GND2 line between ASC-ECU connector and body ground.
STEP 8. Retest the system.