C0660
DTC C0660
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC C0660
- Level Control Exhaust Solenoid Valve Circuit
For symptom byte information, refer to Symptom Byte List Symptom Byte List
Diagnostic Fault Information
Circuit Description
The Suspension Control Module adjusts the vehicle suspension ride height. The Suspension Control Module determines the height of the vehicle based on signals from the position sensors. The Suspension Control Module raises and lowers the vehicle in order to keep the vehicle level by controlling the exhaust valve and air compressor control circuits.
Conditions for Running the DTC
* Battery voltage is between 9-16 V.
* The exhaust valve is commanded ON.
Conditions for Setting the DTC
* The exhaust solenoid control circuit is shorted to voltage or open when solenoid activation is commanded ON for 2.5 s.
* The exhaust solenoid supply voltage circuit is shorted to ground or open when solenoid activation is commanded OFF for 5 s.
Action Taken When the DTC Sets
* The electronic suspension control system will be inoperative.
* The SERVICE LEVELING SYSTEM message will be displayed.
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 44 ignition cycles.
Reference Information
Schematic Reference
Electronic Suspension Control Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Electronic Suspension Control Description and Operation Electronic Suspension Control
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, engine running.
2. Verify the Exhaust Solenoid Valve turns ON and OFF when the Exhaust Valve is commanded ON and OFF with the scan tool.
• If the exhaust solenoid valve does not turn ON and OFF with each command
Refer to Circuit/System Testing
• If the exhaust solenoid valve turns ON and OFF with each command
3. All OK.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF. It may take up to 5 minutes for all vehicle systems to power down.
2. Disconnect the harness connector at the Q4 Vehicle Level Control Solenoid Valve, ignition ON.
3. Test for 11.5-12.5 V between the B+ circuit terminal B and ground.
• If less than 11.5 V
1. Ignition OFF, disconnect the harness connector at the K19 Suspension Control Module.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K19 Suspension Control Module.
• If greater than 12.5 V
1. Ignition OFF, disconnect the harness connector at the K19 Suspension Control Module, ignition ON.
2. Test for less than 1 V between the B+ circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K19 Suspension Control Module.
• If within 11.5-12.5 V
4. Test for less than 10 ohms between the low reference circuit terminal B and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the K19 Suspension Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K19 Suspension Control Module.
• If less than 10 ohms
5. Test or replace the Q4 Vehicle Level Control Solenoid Valve.
Component Testing
1. Ignition OFF, disconnect the harness connector at the Q4 Vehicle Level Control Solenoid Valve.
2. Test for 18-45 ohms between the low reference circuit terminal B and the B+ circuit terminal F.
• If not between 18-45 ohms
Replace the Q4 Vehicle Level Control Solenoid Valve.
• If between 18-45 ohms
3. Test for infinite resistance between the low reference circuit terminal B and ground.
• If less than infinite resistance
Replace the Q4 Vehicle Level Control Solenoid Valve.
• If infinite resistance
4. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Rear Air Spring Compressor Replacement Rear Air Spring Compressor Replacement
* Electronic Suspension Rear Position Sensor Trim Height Calibration Electronic Suspension Rear Position Sensor Trim Height Calibration
* Control Module References Control Module References for Suspension Control Module replacement, programming and setup.