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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1691 (Hybrid Controls - DTC P181C To DTC P2792) >> DTC P2797 >> Circuit/System Testing >> PWM Input Fault

PWM Input Fault

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect PIM connector X1.
  2. Ignition ON, test for 11-13V on the Trans. Aux. Oil Pump Control circuit from PIM connector X1 terminal 3 and chassis ground.
    • If less than the specified range, test the control circuit for an open or short to ground. If the circuit tests normal, replace the ATFP Control Module.
    3. NOTE: Only connect the J 38522:  variable signal generator to the auxiliary transmission fluid pump control circuit when adjusted to 50 percent duty cycle. Duty cycles of less than 50 percent may damage the auxiliary transmission fluid pump assembly.
  3. Pre-Adjust the J 38522:  variable signal generator to 50 percent duty cycle @ 250 Hz.
  4. Connect the J 38522:  variable signal generator to the Trans. Aux. Oil Pump Control circuit, from the PIM connector X1 terminal 3 and ground and listen for auxiliary transmission fluid pump motor operation.
    • If pump operation is audible, replace the PIM.
    • If pump operation is not audible, continue with Circuit/System Testing.
  5. Ignition OFF, disconnect the ATFP control module connector X1.
  6. Ignition ON, test for 0V on the Trans. Aux. Oil Pump control circuit from PIM connector X1 terminal 3 and chassis ground.
    • If greater than the specified range, test the control circuit for a short to voltage.
    • If equal to the specified range, replace the ATFP control module.
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