C0660

DTC C0660





Test 1-3





Test 4-14

Circuit Description
The exhaust solenoid valve is switched on and off via the Suspension Control module. The Suspension Control module provides a switched path to ground whenever exhaust activity is required and during a compressor "head-relief" sequence which occurs at compressor start-up if system pressure is lower than 68.95 kPa (10 psi). The Suspension Control module continually monitors the exhaust solenoid valve circuitry to determine if the voltage level agrees with the commanded state.

Conditions for Running the DTC
Whenever the exhaust solenoid valve is activated.

Conditions for Setting the DTC
^ An open in the control circuit of the exhaust solenoid valve.
^ A short to ground in the control circuit of the exhaust solenoid valve.
^ A short to battery in the control circuit of the exhaust solenoid valve.
^ An open in the battery positive voltage circuit of the exhaust solenoid valve.
^ An open RTD fuse.
^ A malfunctioning exhaust solenoid valve.

Action Taken When the DTC Sets
^ The exhaust solenoid valve is disabled for the remainder of the ignition cycle.
^ Stores a DTC C0660 in the Suspension Control module memory.

Conditions for Clearing the DTC
^ The Suspension Control module no longer detects a open, short to ground, or a short to battery in the control circuit of the exhaust solenoid valve.
^ Using a scan tool.
^ A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Diagnostic Aids
The following conditions may cause a malfunction to occur in the exhaust solenoid valve:
^ A short to ground in the control circuit.
^ An open in the control circuit.
^ A short to battery in the control circuit.
^ An open in the battery positive voltage circuit.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Command both the ON and OFF states. Repeat the commands as necessary.
3. Test the exhaust solenoid valve resistance.
4. Tests for voltage at the coil side of the exhaust solenoid valve. The RTD fuse supplies power to the coil side of the exhaust solenoid valve.
5. Verifies that the Suspension Control module is providing ground to the exhaust solenoid valve.
6. Tests if ground is constantly being applied to the exhaust solenoid valve.
7. Test the control circuit of the exhaust solenoid valve for a short to voltage and an open.
13. The replacement Suspension Control module must be calibrated.