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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 946 (Transfer Case (NVG226-NP8)) >> Diagnostic Information and Procedures >> DTC C0321: Open Lock Solenoid Coil, Open Motor Lock Control Circuit, Or An Open Motor Lock Feed Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. 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.  Listen for an audible click when the encoder motor brake operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3.  Tests for voltage at the Brake Feed side of the encoder motor brake.
  3. 4.  Verifies that the transfer case shift control module is providing ground to the encoder motor brake.
  4. 5.  Tests if ground is constantly being applied to the encoder motor brake.
  5. 6.  Tests the control circuit of the encoder motor brake for a short to voltage or an open.
  6. 7.  Tests the control circuit of the encoder motor brake for a short to ground.
Fig 1: DTC C0321 (Steps 1-4)
G01705678Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC C0321 (Steps 5-13)
G01705679Courtesy of GENERAL MOTORS CORP.
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