Automatic Level Control

DTC 033

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 033
- Exhaust Valve Excessive On Time

Circuit/System Description

The automatic level control sensor monitors the exhaust valve on time when the vehicle is lowering and is limited to 255 seconds.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

This DTC is set when the automatic level control sensor detects the exhaust valve has been on for 255 seconds and the automatic level control sensor did not detect the calibrated downward movement.

Action Taken When the DTC Sets

The automatic level control sensor disables the leveling functions.

Conditions for Clearing the DTC

* The conditions that caused the DTC to set have been removed.
* The ignition switch has been cycled from OFF to ON.

Diagnostic Aids

An air line or exhaust valve blockage in the system will cause this DTC to set.

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

1. Verify that the DTC sets within the Conditions for Running and Setting. Inspect the automatic level control sensor link for damage or being disconnected.
2. Perform the automatic level control sensor replacement procedure.
3. Operate the vehicle within the conditions that the customer experienced and verify the DTC does not reset.

Repair Instructions

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

Important: System untested code will continue to flash until Self test has been completed after the 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))