Symptom 01
DTC C0660 (Symptom 01)
Circuit Description
The automatic level control (ALC) adjusts the vehicle suspension ride height. The electronic suspension control (ESC) module determines the height of the vehicle based on the signal from the rear height sensors. The ESC raises and lowers the vehicle in order to keep the vehicle level.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0660.01 Level Control Exhaust Valve Circuit High
Conditions for Running the DTC
* The ESC module is powered up.
* The exhaust valve is commanded ON.
Conditions for Setting the DTC
The exhaust valve control circuit is shorted to voltage.
Action Taken When the DTC Sets
The ALC will be inoperative.
Conditions for Clearing the MIL/DTC
* DTC C0660 will change from a current DTC to a history DTC on the next ignition cycle.
* DTC C0660 will be cleared from history after 100 ignition cycles.
Diagnostic Aids
* Inspect for the addition of aftermarket components.
* Inspect all wiring harnesses carefully for chaffs and proper routing.
* This circuit is monitored every 3 milliseconds. If the exhaust valve solenoid is found to shorted to battery for 10 milliseconds the code will be stored as current.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. This step tests the exhaust valve solenoid circuit for proper operation.
4. This step tests the control circuit for a short to voltage.
