C0711

DTC C0711

Circuit Description

The air suspension pressure sensor sends a voltage signal to the air suspension module that corresponds to a pressure within the range of 30-180 psi. The air suspension 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.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0711 Level Control Air Pressure Sensor Circuit

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The air suspension module detects that the rate of height change, central air camber pressure or the signal from the air pressure sensor is out of limits.

Action Taken When the DTC Sets

* Air Suspension functionality is suspended.
* SERVICE AIR SUSPENSION message is displayed.

Conditions for Clearing the DTC

* The DTC will be active when the vehicle is moving, but then it will go to history when the vehicle is not moving.
* DTCs can be cleared with scan tool.

Diagnostic Aids

Repair all other DTCs before C0711.

This DTC is set when:

* The pneumatic status of the air suspension system is out of limits.
* When excessive amounts of time have elapsed when inflating the air springs.
* When there is a air leak in the system.
* When vehicle speed is greater than 3 km/h (1.8 mph) and rate of height change is out of limits which may be caused by a damaged LR or RR air suspension sensor.
* When the 60-amp compressor fuse is open.
* When the compressor relay is defective.
* When there is an intermittent or permanent loss of continuity between the compressor and the compressor supply voltage during an upwards leveling event.

Test Description

The numbers below refer to the step numbers on the diagnostic table.
2. Test for the proper operation of the compressor and compressor relay.
3. Tests for open circuits in the compressor battery positive voltage circuit and compressor ground circuit.
4. Tests for voltage in the 5-volt reference circuit.
5. Tests for a high resistance or for an open in the low reference circuit.
10. Check for open or high resistance in the sensor ground circuit.
14. The replacement suspension module calibration must be checked and calibrated if necessary.

Step 1 - Step 8:

Step 9 - Step 15: