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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1349 (Transfer Case - NVG 246-NP8 (Two Speed Automatic)) >> 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

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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. This step tests for voltage at the lock solenoid feed side of the encoder motor lock solenoid.
  3. 4. This step verifies that the lock solenoid battery positive circuit is not shorted to power, shorted to ground, or have high resistance.
  4. 5. This step determines if the encoder motor lock solenoid is faulty by checking the internal resistance.
  5. 6. This step tests the control circuit of the encoder motor brake for a short to voltage or an open.
  6. 7. This step determines if a corroded or damaged connector in the encoder motor harness is the cause.
Fig 1: DTC C0321
G01481089Courtesy of GENERAL MOTORS CORP.
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