C1768

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Part 2 Of 2:

Circuit Description
The ESC module provides a common regulated power supply of about 8 volts to all of the position sensors. The ESC module monitors this power supply for a malfunction that could prevent it from correctly regulating the supply voltage.

Conditions for Setting the DTC
- The ESC module senses position sensor supply voltage under 6 volts or over 9 volts.
- The condition must be detected for 1 second.

Action Taken When the DTC Sets
- Stores a DTC C1768 in the ESC memory.
- Provides shock absorber solenoid control based only on the vehicle speed.
- Sends a message to the IPC to display the SERVICE RIDE CONTROL message.

Conditions for Clearing the DTC
- A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
- The ESC module senses the correct sensor supply voltage (6-9 volts).
- The IPC clearing DTCs feature
- Using a scan tool

Diagnostic Aids
The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to ground is detected on any of the position sensor supply circuits.
- An intermittent short to voltage is detected on any of the position sensor supply circuits.
- The ESC module uses a common power supply in order to provide voltage to all of the position sensors. Therefore, a position sensor (overcurrent) code may be set if a malfunction is detected on any position sensor supply circuit.
- If any position sensor supply circuit is shorted to ground, the scan tool will indicate all of the position sensor voltage readings as zero.
- If any position sensor is shorted to voltage, the position sensor will still function properly and the scan tool will display a valid position sensor voltage reading.
- An intermittent DTC C1768 may produce a random firm/soft condition.


Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This step determines whether the malfunction is located in the position sensor supply circuit or in the position sensor itself.
3. This step uses a scan tool in order to determine whether a short to ground or a short to voltage is present in the position sensor supply circuit. A short to ground exists if the scan tool displays all position sensor voltage as zero.
6. This step determines what position sensor is causing the malfunction.
7. This step checks for an intermittent malfunction and requests a thorough inspection of all related position sensor supply circuit wiring and connectors.