C0711

DTC C0711

DTC Descriptor

DTC C0711

Level Control Air Pressure Sensor Circuit

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

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
^ Circuit Testing
^ Connector Repairs
^ Testing for Intermittent Conditions and Poor Connections
^ Wiring Repairs

Scan Tool Reference
^ Scan Tool Data List
^ Scan Tool Data Definitions
^ Scan Tool Output Controls

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the air compressor.
2. 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.

3. 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.

4. 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.

5. If all circuits test normal, replace the air pressure sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

^ Automatic Level Control Air Dryer and Pressure Sensor Replacement
^ Control Module References for ESCM replacement, setup, and programming