STEP 1. Scan tool MB991958 CAN bus diagnostics
STEP 2. Check the following connector:
STEP 3. Voltage measurement at the AWD-ECU connector
(1) Disconnect the C-228 AWD-ECU connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the C-228 wiring harness side connector terminals No.3, No.4 (Ignition switch "ON") and the body ground.OK: System voltage
Is the check result normal?
Go to Step 5
.
Go to Step 4
.
STEP 4. Wiring harness check
STEP 5. Resistance measurement at the AWD-ECU connector
(1) Disconnect the C-228 AWD-ECU connector.
(2) Measure the resistance between the C-228 wiring harness side connector terminals No. 10 and the body ground.OK: Continuity exists (2 ohm or less)
Is the check result normal?
Go to Step 7
.
Go to Step 6
.
STEP 6. Wiring harness check
STEP 7. Retest the system.
STEP 8. Retest the system.