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DTC C1628: Electronic Controlled Coupling Solenoid (Center) Current Fails
 
 
 
 
OPERATION
The AWC-ECU monitors the current value of the electronic control coupling solenoid (center).
 
 
DTC SET CONDITIONS
This DTC is stored when the abnormality below is detected:
  • Commanded current to the electronic control coupling (center) does not correspond with the monitored current value.
 
 
PROBABLE CAUSES
  • Malfunction of electronic control coupling solenoid (center)
  • Damaged harness wires and connectors
  • Malfunction of AWC-ECU
 
 
DIAGNOSTIC PROCEDURE
STEP 1. 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 SOL+, SOL- and body ground
OK: No continuity
Is the check result normal?
Go to Step 3.
Go to Step 2.
 
STEP 2. Check the wiring harness between electronic control coupling solenoid (center) connector and AWC-ECU connector terminal SOL+, SOL-.
Check the power supply or ground line for short circuit.
Is the check result normal?
Go to Step 4.
Repair the defective connector or the wiring harness.
 
STEP 3. Check of the electronic control coupling (center)
Refer to GROUP 27C - On-vehicle Service .
Is the check result normal?
Go to Step 4.
Replace the electronic control coupling (center). (Refer to GROUP 27C - Electronic control coupling ).
 
STEP 4. Check whether the DTC is stored again.
Is DTC No.C1628 stored?
Replace the AWC-ECU (Refer to ). Then go to Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
 
STEP 5. Check whether the DTC is stored again.
Is DTC No.C1628 stored?
Return to Step 1.
This diagnosis is complete.