C1710

CIRCUIT DESCRIPTION
The ESC module uses the Pulse-Width Modulation (PWM) method in order to control each shock absorber solenoid. Switching the voltage ON and OFF at each shock absorber solenoid, or pulse width modulating, limits the amount of current supplied to that particular solenoid. The ESC module periodically commands each shock absorber to an set PWM duty cycle in order to override the normal PWM command. During this set PWM duty cycle, the ESC module is able to perform a diagnostic test on each shock absorber solenoid, and can determine if a malfunction is present. The ESC module is only able to detect certain malfunctions during a given state (ON or OFF). In order to test for the conditions that set a DTC C1710, the ESC module must first command the LF solenoid ON. If a high voltage level is detected in the LF solenoid drive circuit during the ON state, the test is again repeated. If the ESC module determines that the voltage levels detected in both tests are higher than expected, a malfunction is present and a DTC will set.

CONDITIONS FOR SETTING THE DTC
The ESC module detects a high voltage level (short to voltage) on the LF solenoid drive circuit during two diagnostic tests performed.

ACTION TAKEN WHEN THE DTC SETS
- Stores a DTC C1710 in the ESC memory.
- Commands 0% PWM duty cycle in order to disable the LF solenoid.
- Sends a message to the IPC to display the SERVICE RIDE CONTROL message.

CONDITIONS FOR CLEARING THE DTC
- The ESC module no longer detects a high voltage level (short to voltage) on the LF solenoid drive circuit during a diagnostic test.
- A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
- Use the IPC clearing DTC feature.
- Using a scan tool.

DIAGNOSTIC AIDS
- The following conditions may cause an intermittent malfunction to occur:
- There is an intermittent short to voltage on the LF solenoid drive circuit.
- The LF solenoid drive and supply circuits are intermittently shorted together.
- There is a LF shock absorber solenoid low resistance, internal short, or short to voltage condition.
- If the conditions for a DTC C171 0 are current, the ESC module will disable the LF solenoid (commanding 0% duty cycle) and the vehicle will experience a soft ride condition on the LF side of the vehicle.
- If the DTC is a history DTC, the problem may be intermittent. Using a scan tool, cycle the LF shock absorber solenoid while moving the wiring and the connectors. This can often cause the malfunction to occur.

TEST DESCRIPTION

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DTC C1710 LF Shock Absorber Solenoid Circuit

The numbers below refer to the step numbers on the diagnostic table:
2. This step measures the resistance value of the LF shock absorber solenoid.
3. This step checks for a short to voltage in the LF shock absorber solenoid.
4. This step checks for a short to voltage on CKT 1113.
5. This step checks for a short between CKT 1113 and CKT 1107.
6. This step checks for an intermittent malfunction and requests a thorough inspection of the related LF shock absorber circuit wiring and connectors.