C0693

DTC C0693





Circuit Description
Shock absorber solenoid voltage is supplied to the ESC module through the RTD relay circuit. The ESC module controls the RTD relay by grounding the RTD relay control circuit. This closes the relay contacts providing each shock absorber solenoid with supply voltage through the ESC module's internal solenoid supply circuitry. Each individual solenoid control then controls the operation of the corresponding shock absorber. The ESC module monitors the RTD relay control/solenoid supply circuits for any malfunction conditions.

Conditions for Running the DTC
^ The ignition ON.
^ The RTD function enabled.

Conditions for Setting the DTC
^ The ESC module detects high voltage, which is a short to voltage on the RTD relay control circuit.
^ Detection for this DTC can only be accomplished during the ON (relay applied) state.

Action Taken When the DTC Sets
^ Stores a DTC C0693 in the ESC memory.
^ Commands 0% PWM duty cycle in order to disable all four solenoids.
^ Sends a message to the IPC to display the SERVICE RIDE CONTROL and the SHOCKS INOPERATIVE messages.
^ Sends a message to the PCM to limit the speed. The PCM then sends a massage to the IPC to display the MAXIMUM SPEED 129 km/h (80 mph) message.

Conditions for Clearing the DTC
^ The ESC module no longer detects high voltage, which is a short to voltage on the RTD relay control circuit.
^ A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ The IPC clearing DTCs feature.
^ Using a scan tool.

Diagnostic Aids
^ The following conditions may cause an intermittent malfunction:
- An intermittent short to voltage on the RTD relay control circuit.
- An internal RTD relay short to voltage.
^ If the conditions for a DTC C0693 are current, the ESC module will command 0% PWM duty cycle in order to disable all four solenoids. The vehicle will experience a soft ride condition.
^ The RTD relay may be installed in the underhood electrical center in two directions and still function properly.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Tests for voltage at the coil side of the RTD relay.
3. Verifies that the ESC module is providing ground to the RTD relay.
4. Tests if ground is constantly being applied to the RTD relay.
5. Tests for a short to voltage in the RTD relay control circuit.