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 Descriptors
DTC C0711 00: Level Control Air Pressure Sensor Malfunction Signal InvalidDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Air Suspension Pressure Sensor Low Reference Circuit | -- | C0711 | -- | -- |
Air Suspension Pressure Sensor 5 Volt Voltage Reference Circuit | C0711 | C0711 | C0711 | -- |
Air Suspension Pressure Sensor Signal Circuit | C0711 | C0711 | C0711 | C0711 |
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
Connector End View Reference
Description and Operation
Automatic Level Control 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 ESC/ALC EXH Fuse in the underhood fuse block.
- Disconnect the air pressure sensor and test for less than 2.0 ohms of resistance between the low reference terminal F at the harness connector and ground.
- Ignition ON, verify that 4.75-5.25 volts exists between the 5 volt reference circuit terminal A of the harness connector and ground.
- Ignition OFF, disconnect the electronic suspension control module connector.
- Test the pressure sensor signal circuit for a short to ground, open/high resistance, or short to voltage.
| ⇒ | 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 electronic suspension control module. |
| ⇒ | 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. |
| ⇒ | If all circuits test normal, test or replace the automatic level control compressor assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for Air Suspension Control Module replacement, setup and programming |
