• | 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. |
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 |
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.
Battery voltage is between 9-16 volts.
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.
• | The air suspension system will be inoperative. |
• | The SERVICE SUSPENSION SYSTEM message will be displayed. |
• | 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. |
Automatic Level Control Schematics
Automatic Level Control Description and Operation
Control Module References for Scan Tool Information
⇒ | 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for Air Suspension Control Module replacement, setup and programming |