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Test Description

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

  1. 2. This step tests the ability of the PCM to command the PC solenoid valve.
  2. 3. This step tests the PC solenoid valve and the AT wiring harness assembly for incorrect resistance.
  3. 6. This step tests the PC solenoid valve and the internal wiring harness for a short to ground.
  4. 9. This step tests the entire PC solenoid valve circuit up to the PCM for continuity.
  5. 10. This step tests for a short to ground in the PC solenoid valve high control circuit (CKT 1228) and the PC solenoid valve low control circuit (CKT 1229) of the engine harness.
Fig 1: DTC P0748 (Steps 1 - 5)
G01952185Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0748 (Steps 6 - 12)
G01952186Courtesy of GENERAL MOTORS CORP.
Fig 3: DTC P0748 (Steps 13 - 18)
G01952187Courtesy of GENERAL MOTORS CORP.
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