2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 993

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 993

The electronic suspension control (ESC) module provides a common regulated reference voltage of approximately 5 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 Running the DTC

* Battery voltage is between 9-16 volts

* Ignition is ON

Conditions for Setting the DTC

* The ESC module senses suspension position sensor supply voltage under 4.75 volts or over 5.25 volts.

* The condition is detected for 1 second in 4 consecutive ignition cycles.

Action Taken When the DTC Sets

* Commands speed dependent damping system and normal force signals to the default state.

* The ESC sends a message to the instrument panel cluster (IPC) to display SERVICE SUSPENSION SYSTEM 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.

* The IPC clearing DTC feature.

Reference Information

Schematic Reference

Electronic Suspension Control Schematics (See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic

)/Diagrams/Electrical Diagrams/Electronic Suspension Control)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Electronic Suspension Control Description and Operation (See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic

)/Description and Operation/Electronic Suspension Control Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for Scan Tool Information

Circuit/System Verification

Ignition ON, observe the scan tool Position Sensor Data parameters. The readings should vary between 0.35-4.75 volts while the vehicle is jounced.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at all 4 suspension position sensors.

2. Ignition ON, test for 4.75-5.25 volts between the 5 volt reference circuit terminal A and ground at each sensor connector.

瀚慖f less than the specified range, test the 5 volt reference circuit for a short to ground or an open/high resistance. If all circuits test normal,

replace the ESC module.

瀚慖f greater than the specified range, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the ESC

module.

3. Reinstall each sensor, one at a time, while verifying for 4.75-5.25 volts between the 5 volt reference circuit terminal A and ground of the last

sensor connector to be connected.

瀚慖f the voltage is out of the range when one of the 3 sensors are connected, test or replace the suspect suspension position sensor.