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Home >> Cadillac >> 2011 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1220 (Hybrid Engine Control System) >> Diagnostic Information and Procedures >> DTC P2797 >> Circuit/System Testing >> PWM Input Fault
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PWM Input Fault

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. 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 5 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. IMPORTANT: Only connect the J 38522  to the ATFP control circuit when adjusted to 50 percent duty cycle. Duty cycles of less than 50 percent may damage the ATFP 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 5 and ground and listen for ATFP 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 5 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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