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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0711 Level Control Air Pressure Sensor Circuit Malfunction
This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description .
DTC Symptom | DTC Symptom Descriptor |
|---|---|
00 | No Additional Information |
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The air suspension control 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 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. |
| • | Excessive amounts of time have elapsed when inflating the air springs. |
| • | There is an air leak in the system. |
| • | Vehicle speed is greater than 3 km/h (1.8 mph) and rate of height change is out of limits. |
| • | The 40-amp compressor fuse is open. |
| • | The compressor relay is defective. |
| • | 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.
-
This step tests for the proper operation of the compressor and compressor relay.
-
This step tests for open circuits in the compressor battery positive voltage circuit and compressor ground circuit.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Air Suspension Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
|
Important: Be sure all doors are closed and engine is running for this test.
Does the DTC C0711 reset as a current DTC? | -- | Go to Step 3 | Go to Diagnostic Aids | |
Did you complete the replacement? | -- | Go to Step 4 | -- | |
4 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
