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 Descriptor
DTC C0711 00
- Level Control Air Pressure Sensor Malfunction Signal Invalid




Diagnostic Fault Information






Circuit Description

The air suspension pressure sensor sends a voltage signal to the air suspension control module that corresponds to a pressure within the range of 30-180 psi. The air suspension control module also uses this signal to verify that the proper amount of pressure is achieved in the air dryer within 23 seconds prior to opening of the inlet valves for inflation of the air springs.


Conditions for Running the DTC

Battery voltage is between 9-16 volts.


Conditions for Setting the DTC

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


The air suspension module detects that the signal voltage circuit for the pressure sensor falls below 0.5 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

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. 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 ECAS MDL 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 C1 (Left) or C8 (Right) 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 control module.

4. Ignition ON, verify that 4.75-5.25 volts exists between the 5-volt reference circuit terminal C3 (Left) or C6 (Right) 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 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 air suspension control module.

5. Ignition OFF, disconnect the air suspension control module connector.
6. 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 air suspension compressor assembly.




Repair Instructions

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

* Air Spring Replacement (Service and Repair)
* Air Suspension Air Line Replacement (Service and Repair)
* Compressor Assembly Automatic Level Control Air Replacement (Dual Compressors) (Compressor Assembly Automatic Level Control Air Replacement (Dual Compressors))
* Suspension Position Calibration (Suspension Position Calibration)
* Programming and Relearning (Programming and Relearning)for Air Suspension Control Module replacement, setup and programming