C0625
DTC C0625 or C0630
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provides an overview of each diagnostic category.
DTC Descriptors
DTC C0625 08
- Left Rear Position Sensor Circuit Signal Invalid
DTC C0625 55
- Left Rear Position Sensor Circuit Expected Number of Transitions/Events not Reached
DTC C0630 08
- Right Rear Position Sensor Circuit Signal Invalid
DTC C0630 55
- Right Rear Position Sensor Circuit Expected Number of Transitions/Events not Reached
Diagnostic Fault Information
Circuit/System Description
The left and right rear air suspension position sensors provide a signal voltage between 0.3-4.70 volts to the air suspension control module. This signal voltage represents the wheel's position relative to the body. The air suspension control module provides a 5-volt reference and a low reference to the sensors.
Conditions for Running the DTC
* Ignition voltage is between 9-16 volts.
* Vehicle is in motion.
Conditions for Setting the DTC
* The air suspension module detects the voltage at the air suspension sensor signal circuit is less than 0.3 volt or greater than 4.70 volts for more than 500 milliseconds.
* The air suspension module detects that there is a wide differential between the signal voltage ranges of one sensor in comparison to the other over a predetermined period of time.
Action Taken When the DTC Sets
* Air suspension functionality is suspended.
* The SERVICE SUSPENSION SYSTEM message is displayed.
Conditions for Clearing the DTC
The condition for setting the DTC no longer exists.
Reference Information
Schematic Reference
Air Suspension Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Component Connector End Views)
Description and Operation
Air Suspension Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Programming and Relearning (Programming and Relearning)for Scan Tool Information
Circuit/System Testing
1. Ignition OFF, remove the HVAC ECAS Fuse in the underhood fuse block. Test for less than 2.0 ohms of resistance between low reference terminal 3(LR) or terminal 3(RR) at the harness connector and ground.
• If greater than specified, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the air suspension module.
2. Ignition ON, verify that 4.70-5.25 volts exists between the 5 volt reference circuit terminal 1(LR) and terminal 1(RR) of the harness connector and ground.
• If less that the specified range, test the 5 volt reference circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the air suspension module.
• If greater that the specified range, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the air suspension module.
3. Ignition OFF, disconnect the air suspension module connector.
4. Test the applicable rear strut position sensor signal circuit for a short to ground, open/high resistance, or short to voltage.
• If all circuits test normal, replace the applicable rear suspension position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Air Spring Leveling Sensor Replacement (Air Spring Leveling Sensor Replacement)
* Suspension Position Calibration (Suspension Position Calibration)
* Programming and Relearning (Programming and Relearning)for air suspension control module replacement, setup, and programming