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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 C0374: Unable To Correct Sensed Wheel Slip >> Test Description

Test Description

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The numbers below refer to the step numbers on the diagnostic table.

  1. 2. This step determines if the rear propshaft speed sensor and wiring are operating properly.
  2. 3. This step determines if the front propshaft speed sensor and wiring are operating properly.
  3. 4. This step determines if the motor control A or motor control B circuit are shorted to ground within the encoder motor.
  4. 5. This step tests the integrity of the motor windings.
  5. 6. This step tests the motor control A and motor control B circuits for an open, short to ground, or high resistance between the encoder motor and the transfer case shift control module.
  6. 7. This step determines whether the transfer case is mechanically functioning properly.
Fig 1: DTC C0374 (Steps 1-4)
G01481093Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC C0374 (Steps 5-11)
G01481094Courtesy of GENERAL MOTORS CORP.
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