Soft and Non-Uniform Ride

Soft and Non-Uniform Ride

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



Circuit/System Description

The electronic suspension control (ESC) module utilizes the suspension position sensor signals to control the shock absorber suspension dampers.


Diagnostic Aids

Before proceeding with the diagnostics, ensure the electrical harness connectors at the dampers and sensors are fully engaged by pushing the harness connector toward the damper or sensor. If an audible click is heard, or substantial engagement travel is noted, ensure the remaining damper and sensor connectors are fully engaged as well.


Reference Information
Schematic Reference

Electronic Suspension Control Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Electronic Suspension Control 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

Control Module References (Programming and Relearning) for Scan Tool Information


Circuit/System Testing

Ignition ON, with the scan tool, observe each Position Sensor data parameter while jouncing the vehicle at each corner. The corresponding parameters should fluctuate with each action.

If a parameter does not fluctuate or is erratic, test or replace the position sensor associated with that particular parameter.



Component Testing

1. Install a 3A fused jumper wire between the 5 volt reference terminal A and a external 5 volt power source. Install a jumper wire between the low reference terminal C and ground.
2. Sweep the suspension position sensor through the entire range while monitoring the voltage between the signal terminal B and the low reference terminal C. The range should vary between 0.35-4.75 volts without any spikes or dropouts.

• If not within the specified range or if it is erratic, replace the applicable suspension position sensor.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Electronic Suspension Front Position Sensor Replacement (Electronic Suspension Front Position Sensor Replacement)
* Electronic Suspension Rear Position Sensor Replacement (Electronic Suspension Rear Position Sensor Replacement)