C0660

Circuit Description
The exhaust solenoid valve is switched on and off via the suspension control module. The 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 10 psi). The 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 activity is required.


Conditions for Setting the DTC
^ Open in the control circuit of the exhaust solenoid valve.
^ Short to ground in the control circuit of the exhaust solenoid valve.
^ Short to battery in the control circuit of the exhaust solenoid valve.
^ Open in the battery positive voltage circuit of the exhaust solenoid valve.
^ Open RTD MODULE 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.
^ DTC C0660 will be stored in memory.


Conditions for Clearing the MIL/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.
^ A history DTC will clear after not seeing the malfunction for 100 consecutive ignition cycles.
^ Using a scan tool.


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


Test Description
The number(s) below refer to the step number(s) 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 MODULE 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 control module must be calibrated.