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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 813 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> DTC P0748: PC Duty Cycle >> Test Description

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 correct 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, solenoid A, circuit (CKT 1228) and the PC solenoid valve low control, solenoid A, circuit (CKT 1229), of the engine harness.
    Fig 1: Diagnostic Trouble Code (DTC P0748) Table (Step 1-5)
    G02112027Courtesy of GENERAL MOTORS CORP.
    Fig 2: Diagnostic Trouble Code (DTC P0748) Table (Step 6-12)
    G02112028Courtesy of GENERAL MOTORS CORP.
    Fig 3: Diagnostic Trouble Code (DTC P0748) Table (Step 13-18)
    G02112029Courtesy of GENERAL MOTORS CORP.
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