Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

2) - Tests the electrical function of the front axle actuator. Helps determine between mechanical and electrical malfunctions.
3) - Tests for proper and ground at the front axle actuator.
4) - Tests the operation of the front axle control circuit.
5) - Tests the electrical function of the front axle actuator control circuit.
6) - Tests for proper supply voltage to the front axle actuator.
7) - Tests for open fuse in the front axle feed circuit.
8) - Tests the front axle control circuit for an open or high resistance.
9) - Tests the front axle switch circuit for an open or high resistance.
10) - Helps determine if the front axle actuator has a mechanical malfunction.
11) - Tests the front axle switch circuit for a short to voltage.
12) - Inspect the front axle for a mechanical malfunction.

Fig 1: Front Axle Will Not Disengage Diagnosis (Steps 1-5)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Front Axle Will Not Disengage Diagnosis (Steps 6-17)

Courtesy of GENERAL MOTORS CORP.