GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The consecutive intake register will keep track of the number of times a compress sequence is initiated, without an exhaust sequence, while the vehicle is moving. This allows detection of air leaks when the vehicle is moving.

Conditions for Setting the DTC

When the number of compress sequences is more than 10, without an exhaust sequence.

Action Taken When the DTC Sets

    • All compressor intake activity is disabled.
    • The LEVELING indicator lamp flashes.

Conditions for Clearing the DTC

    • Initiation of an exhaust sequence
    • The ignition cycles from OFF to ON.
    • Use a scan tool in order to clear this DTC.

Diagnostic Aids

Refer to Automatic Level Control System Operation Check .