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Test Description

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 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 rear speed sensor low circuit for a short to ground, a high resistance, or an open.
  5. 6. Tests the rear speed sensor high circuit for a short to ground, a high resistance, or an open.
  6. 7. Tests the rear speed sensor high circuit for a short to voltage.
  7. 8. Tests the rear speed sensor low circuit for a short to voltage.
  8. 9. Tests the rear speed sensor high circuit for a short to the rear speed sensor low circuit.
Fig 1: DTC C0300 (1 Of 2)
G01643198Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC C0300 (2 Of 2)
G01643199Courtesy of GENERAL MOTORS CORP.
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