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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 767 (Transfer Case - NVG 136-NP4 (1-Speed Automatic)) >> Diagnostic Information & Procedures >> DTC C0305 >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. 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)  - Tests to see if the malfunction is intermittent.
  2. 3)  - Tests the internal resistance of the propshaft speed sensor.
  3. 4)  - Tests to see if the propshaft speed sensor can generate a sufficient amount of AC voltage.
  4. 5)  - Tests the FSS LO circuit for a short to ground, a high resistance, or an open.
  5. 6)  - Tests the FSS HI circuit for a short to ground, a high resistance, or an open.
  6. 7)  - Tests the FSS LO circuit for a short to voltage.
  7. 8)  - Tests the FSS HI circuit for a short to voltage.
  8. 9)  - Tests the FSS LO circuit for a short to the FSS HI circuit.
Fig 1: DTC C0305 Diagnosis (Steps 1-3)
G02502154Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC C0305 Diagnosis (Steps 4-12)
G02502155Courtesy of GENERAL MOTORS CORP.
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