C0711

DTC C0711

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 C0711 00
- Level Control Air Pressure Sensor Malfunction Signal Invalid

Diagnostic Fault Information






Circuit Description

The automatic level control (ALC) pressure sensor sends a voltage signal to the electronic suspension control module (ESCM) that corresponds to a pressure within the range of 30-180 psi.

Conditions for Running the DTC

Battery voltage is between 9-16 volts.

Conditions for Setting the DTC

The ESCM detects that the supplied 5 volt reference voltage circuit for the pressure sensor falls below 4.75 volts or exceeds 5.25 volts.

The ESCM detects that the signal voltage circuit for the pressure sensor falls below.5 volt or exceeds 4.75 volts.

Action Taken When the DTC Sets

* The air suspension system will be inoperative.
* The SERVICE SUSPENSION SYSTEM message will be displayed.

Conditions for Clearing the MIL/DTC

* When the fault is no longer present, DTC C0711 will change from a current DTC to a history DTC on the next ignition cycle.
* DTC C0711 will be cleared from history after 50 ignition cycles.

Reference Information
Schematic Reference

Automatic Level Control Schematics Automatic Level Control
Connector End View Reference

Component Connector End Views Connector Views
Description and Operation

Automatic Level Control Description and Operation Automatic Level Control
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 Control Module References for Scan Tool Information

Circuit/System Testing

1. Verify that there are no air leaks in the system.

• If a leak is found, repair or replace the leaking component as necessary.

2. Ignition OFF, remove the ESC/ALC EXH Fuse in the underhood fuse block.
3. Disconnect the air pressure sensor and test for less than 2.0 ohms between the low reference terminal F 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 electronic suspension control module.

4. Reinstall the ESC/ALC EXH Fuse in the underhood fuse block.
5. Ignition ON, verify that 4.75-5.25 volts exists between the 5 volt reference circuit terminal H 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 electronic suspension control 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 electronic suspension control module.

6. Ignition OFF, disconnect the electronic suspension control module connector.
7. Test the pressure sensor signal circuit for a short to ground, open/high resistance, or short to voltage.

• If all circuits test normal, test or replace the automatic level control compressor assembly.

Repair Instructions

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

* Air Tube Repair Service and Repair
* Air Compressor Replacement Air Compressor Replacement
* Control Module References Control Module References for Air Suspension Control Module replacement, setup and programming