Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C0711 00: Level Control Air Pressure Sensor CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Air Suspension Pressure Sensor 5-Volt Voltage Reference | C0711 00 | C0711 00 | C0711 00 | -- |
Air Suspension Pressure Sensor Signal | C0711 00 | C0711 00 | C0711 00 | C0711 00 |
Air Suspension Pressure Sensor Low Reference | -- | C0711 00 | -- | -- |
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. |
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 underhood fuse block 60-amp compressor fuse (ECAS fuse 61) 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. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Air Suspension Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Testing
- Verify that there are no air leaks in the system.
- Ignition OFF, remove the ECAS Fuse 32 in the underhood fuse block and disconnect the harness connector at the air pressure sensor.
- Test for less than 2.0 ohms between the low reference terminal at the harness connector and ground.
- Ignition ON, verify that 4.8-5.2 volts exists between the 5-volt reference circuit terminal of the harness connector and ground.
- Verify the scan tool Air Pressure Sensor parameter is less than 0.5 volts.
- Install a 3A fused jumper wire between the signal circuit terminal and the 5-volt reference circuit terminal. Verify the scan tool Air Pressure Sensor parameter is greater than 4.8 volts.
- If all circuits test normal, test or replace the valve automatic level control solenoid.
| ⇒ | If a leak is found, repair or replace the leaking component as necessary. |
| ⇒ | If greater than specified, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the air suspension control module. |
| ⇒ | If less than 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 than 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. |
| ⇒ | If greater than the specified range, test the signal circuit terminal for a short to voltage. If the circuit tests normal, replace the air suspension control module. |
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the air suspension control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for Air Suspension Control Module replacement, setup and programming |
