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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1614 (Transfer Case - NVG 246-NP8 (Two Speed Automatic)) >> Diagnostic Information and Procedures >> Front Axle Will Not Engage >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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.

  1. 2. This step tests the electrical function of the front axle actuator and helps determine mechanical and electrical malfunctions.
  2. 3. This step tests for proper power and ground at the front axle actuator.
  3. 4. This step tests the operation of the front axle control circuit.
  4. 5. This step helps determine if the transfer case shift control module is able to monitor the front axle switch.
  5. 6. This step tests the front axle switch circuit for an open or high resistance.
  6. 7. This step measures the voltage between the front axle feed circuit and ground.
  7. 8. This step tests the front axle control circuit for an open or high resistance.
  8. 9. This step inspects the front axle for a mechanical malfunction.
  9. 10. This step tests for open fuse in the front axle feed circuit.
Fig 1: Front Axle Will Not Engage (Steps 1-4)
G01481098Courtesy of GENERAL MOTORS CORP.
Fig 2: Front Axle Will Not Engage (Steps 5-15)
G01481099Courtesy of GENERAL MOTORS CORP.
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