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 number(s) below refer to the step number(s) on the diagnostic table.
- 2) - Listen for an audible motor noise when the transfer case encoder motor operates. Command both the ON and OFF states. Repeat the commands as necessary.
- 3) - This step tests for a short to ground in the motor control A circuit.
- 4) - This step tests for a short to ground in the motor control B circuit.
- 5) - This step tests for a higher than normal resistance in the motor control A and B circuits through the module.
- 6) - This step tests for a short to ground in the transfer case encoder motor windings.
- 7) - This step tests for continuity across the motor circuit. Resistance readings vary depending on the location of the brush contact inside the motor assembly.
- 8) - This step tests motor control A circuit for a short to ground.
- 9) - This step tests motor control B circuit for a short to ground.
- 10) - This step tests motor control A and B circuits for an open or high resistance.