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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 665 (Transfer Case - NVG 263-NP1 (SELECTABLE)) >> Diagnostic Information & Procedures >> DTC C0310: Open In The Motor Control A Or Motor Control B Circuits, Or An Open Motor >> Test Description

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.

  1. 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.
  2. 3)  - This step tests the for a higher than normal resistance in the motor control A and B circuits and through the module.
  3. 4)  - This step tests the motor control A circuit for an open or high resistance.
  4. 5)  - This step tests the motor control B circuit for an open or high resistance.
  5. 6)  - This step tests for continuity across the motor circuit.
Fig 1: DTC C0310 Diagnosis
G01668889Courtesy of GENERAL MOTORS CORP.
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