STEP 1. Check of the fuse No.13 and No.15.
STEP 2. Check the wiring harness between electronic control coupling solenoid connector and AWC-ECU connector terminal SOL+.
STEP 3. Check the wiring harness between electronic control coupling solenoid connector and AWC-ECU connector terminal SOL-.
STEP 4. Check of the electronic control coupling solenoid
STEP 5. Check the wiring harness between ETACS-ECU connector and AWC-ECU connector terminal AWDF
STEP 6. Check the wiring harness between ETACS-ECU connector and AWC-ECU connector terminal IG16
Check the power supply for short circuit.Is the check result normal?
Replace the fuse Nos.13 and 15. Repair the wiring harness wire and/or connector(s), and then replace fuse No.15.
STEP 7. Voltage measurement at ETACS-ECU connector
STEP 8. Check the wiring harness between ETACS-ECU connector terminal +B1 and fusible link No.40
STEP 9. Voltage measurement at the AWC-ECU connector
(1) Disconnect the connector, and measure the voltage between terminal IG1 and body ground at the wiring harness side.
(2) Turn the ignition switch to the ON position.OK: System voltage
Is the check result normal?
Go to Step 11. Go to Step 10.
STEP 10. Check the wiring harness between ETACS-ECU connector terminal IG16 and AWC-ECU connector terminal IG1.
STEP 11. Voltage measurement at the AWC-ECU connector
STEP 12. Check the wiring harness between ETACS-ECU connector and AWC-ECU connector terminal BATT.
STEP 13. Measure the resistance at the AWC-ECU connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance between AWC-ECU connector terminal GND1 and body ground.OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 15. Go to Step 14.
STEP 14. Check the wiring harness between AWC-ECU connector terminal GND1 and body ground.
STEP 15. Retest the system.
STEP 16. Retest the system.