Soft and Non-Uniform Ride
Soft and Non-Uniform Ride
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.
Diagnostic Fault Information
Circuit/System Description
The electronic suspension control (ESC) module utilizes the suspension position sensor signals to control the suspension dampers. When the driver selects the SPORT position on the suspension control switch, a ground signal is sent to the body control module (BCM). The BCM then sends a serial data signal to the ESC module requesting a firmer damper ride control rate for each damper allowing the driver to customize the ride and handling of the vehicle.
Reference Information
Schematic Reference
Electronic Suspension Control Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Electronic Suspension Control Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
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 appropriate position sensor.
Component Testing
Suspension Position Sensor
1. Install a 3 A fused jumper wire between the 5 volt reference terminal A and 5 volts. 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 (ZR1) (Electronic Suspension Rear Position Sensor Replacement (ZR1))Electronic Suspension Rear Position Sensor Replacement (Without ZR1) (Electronic Suspension Rear Position Sensor Replacement (Without ZR1))