• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Watchdog/Safety Failure | Internal Electronic Failure |
---|---|---|---|---|
Electronic Control Unit Malfunction | -- | -- | DTC C0550 39 | DTC C0550 39 |
This DTC is set anytime a new transfer case shift control module is installed. The transfer case motor learn procedure must be performed to erase this DTC. The DTC must learn the amount of clutch tolerance depending on clutch stackup and the amount of wear the clutches have accumulated.
• | The ignition is ON. |
• | System voltage is 10.5-18 volts. |
The motor learn procedure for a new module has not been performed.
• | Shifting is still disabled until the motor learn procedure has been performed. |
• | The SERVICE 4WD indicator does not light for this DTC. |
The transfer case shift control module clears the DTC if the motor learn procedure has been successfully performed.
Transfer Case Control Schematics
Transfer Case Control Connector End Views
Perform the motor learn procedure before normal operation will occur.
Perform the motor learn procedure.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.