Automatic Level Control

DTC 031 or 032

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.

DTC Descriptor
DTC 031
- Exhaust Valve Circuit Short to Ground

DTC 032
- Exhaust Valve Circuit Short to Battery or Open

Diagnostic Fault Information





Circuit/System Description

The automatic level control sensor monitors the exhaust valve control circuitry for a short to ground, short to battery, or an open/high resistance circuit.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

DTC 031

Short to ground in the control circuit of the exhaust valve.

DTC 032

Open, or shorted to B+ in the control circuit of the exhaust valve.

Action Taken When the DTC Sets

The automatic level control sensor disables leveling functions.

Conditions for Clearing the DTC

The conditions that caused the DTC to set have been removed.

Reference Information
Schematic Reference

Automatic Level Control Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Automatic Level Control Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Verification

Verify that automatic level control functions are disabled.

Circuit/System Testing

1. Ignition OFF, disconnect the exhaust valve harness connector at the automatic level control sensor.
2. Ignition ON, verify that a test lamp illuminates between the exhaust valve B+ circuit and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the automatic level control sensor.

3. Ignition ON, connect a test lamp between the exhaust valve control circuit and the B+ circuit of the exhaust valve. Command the exhaust valve ON and OFF.

• If the test lamp does not illuminate, test the control circuit for a short to ground or open. If the circuit tests normal, test or replace the automatic level control sensor.
• If the test lamp illuminates, test or replace the exhaust valve.

4. If all circuits test normal, test or replace the automatic level control sensor.

Repair Instructions

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

Important: System untested codes will continue to flash until self test has been completed after automatic level control sensor replacement.


* Automatic Level Control Sensor Replacement (IRS) (Automatic Level Control Sensor Replacement (IRS))Automatic Level Control Sensor Replacement (Twist Axle) (Automatic Level Control Sensor Replacement (Twist Axle))
* Air Compressor Replacement (Air Compressor Replacement)