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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 C0300 >> 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 RSS LO circuit for a short to ground, a high resistance, or an open.
  5. 6)  - Tests the RSS HI circuit for a short to ground, a high resistance, or an open.
  6. 7)  - Tests the RSS HI circuit for a short to voltage.
  7. 8)  - Tests the RSS LO circuit for a short to voltage.
  8. 9)  - Tests the RSS HI circuit for a short to the RSS LO circuit.
Fig 1: DTC C0300 Diagnosis (Steps 1-4)
G02502152Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC C0300 Diagnosis (Steps 5-12)
G02502153Courtesy of GENERAL MOTORS CORP.
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