Diagnostic Instructions
DTC Descriptor
DTC C0711 : Level Control Air Pressure Sensor Circuit
Circuit/System Description
The electronic suspension control module (ESCM) supplies 5 volts to the air pressure sensor and monitors the signal voltage to determine the amount of air pressure in the system.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The air pressure sensor signal voltage is below 0.15 volt or above 4.85 volts.
Action Taken When the DTC Sets
| • | DTC C0711 is stored in memory. |
| • | The automatic level control (ALC) system pressure is set to a default value. |
| • | The ALC system is disabled. |
| • | The driver information center (DIC) displays the SERVICE SUSPENSION SYSTEM message after 3 consecutive ignition ON cycles. |
Conditions for Clearing the DTC
| • | A current DTC will clear when the malfunction is no longer present. |
| • | The history DTC will clear after 100 fault-free ignition cycles. |
| • | The air pressure sensor signal voltage is between 0.15 volt and 4.85 volts. |
Diagnostic Aids
| • | Spraying soapy water can aid in identifying leaks. |
| • | A leak in the air line at the air pressure sensor may cause a faulty sensor voltage reading. |
Reference Information
Schematic Reference
Automatic Level Control Schematics
Connector End View Reference
Automatic Level Control Connector End Views
Description and Operation
Automatic Level Control Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the air compressor .
- Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal F and ground.
| ⇒ | If greater than 1 ohm, test the low reference circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the ESC module. |
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal H and ground.
| ⇒ | If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ESC module. |
| ⇒ | If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ESC module. |
- Test for 4.8-5.2 volts between the signal circuit terminal A and ground.
| ⇒ | If less than 4.8 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ESC module. |
| ⇒ | If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ESC module. |
- If all circuits test normal, replace the air pressure sensor.
Repair Instructions
Repair Verification
- Install any components or connectors that have been removed or replaced during diagnosis.
- Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.
- Clear the DTCs.
- Use the scan tool Diagnostic Counter Reset output control function to bypass the 3 consecutive ignition cycle requirement for setting a DTC. This will ensure that if a DTC was to be reset during the repair verification process, it will be displayed
on the scan tool.
- Turn OFF the ignition for 60 seconds.
- Turn ON the ignition.
- If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the
Diagnostic Trouble Code (DTC) List - Vehicle
and perform the appropriate diagnostic procedure
