DTC C1628: Abnormal Electronic Control Coupling Solenoid Current: Diagnosis

Required Special Tools: 

• MB992006: Extra fine probe

1. STEP 1. Check of open circuit, and short circuit in SOL+ line between electronic control coupling solenoid connector and AWC-ECU connector. 

   Q: Is the check result normal? 

   YES:  Go to Step 2.

   NO:  Repair the connector(s) or wiring harness.

2. STEP 2. Check of open circuit, and short circuit in SOLline between electronic control coupling solenoid connector and AWC-ECU connector. 

   Q: Is the check result normal? 

   YES:  Go to Step 3.

   NO:  Repair the connector(s) or wiring harness.

3. STEP 3. Check of the electronic control coupling solenoid. 

   Refer to ELECTRONIC CONTROL COUPLING OPERATION CHECK <AWD> .

   Q: Is the check result normal? 

   YES:  Go to Step 4.

   NO:  Replace the electronic control coupling (Refer to S-AWC DRIVE MODE-SELECTOR <AWD> ).

4. STEP 4. Check whether the DTC is set again. 

   Q: Is the DTC C1628 set? 

   YES:  Replace the AWC-ECU (Refer to AWC-ECU <AWD> ).

   NO:  Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).