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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1358 (Hybrid Controls - DTC P181C To DTC P2797) >> DTC P1AF8 or P1AFE >> Circuit/System Testing >> Open Phase Testing Procedure

Open Phase Testing Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the 3 phase cable assembly cover from the transmission and inspect the 3 phase cable terminal fasteners for the proper torque and for arc-flash damage. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
    • If any fasteners were loose and no arc flash damage is present, torque the fasteners and re-assemble the vehicle. Retest for the DTC.
    • If any fasteners were loose and arc flash damage is present, replace the applicable drive motor generator assembly and the 3 phase cable assembly.
  2. Disconnect the 3 phase cable assembly from the transmission. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
  3. Test each cable for continuity from the PIM connection terminal to the transmission connection terminal.
    • If you measure greater than 0.5 ohms, replace the 3 phase cable assembly.
    • If you measure 0.5 ohms or less, replace the applicable drive motor generator assembly.
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