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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 P1AC6 or P1AC7 >> Circuit/System Testing >> Diagnosis if the Engine Does NOT Start

Diagnosis if the Engine Does NOT Start

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. Ignition OFF, disconnect the CKP sensor connector.
  2. Ignition ON, test for 4.8-5.2 volts on the CKP signal circuit, from the CKP connector terminal A and ground.
    • If within the specified range, reconnect the CKP connector and perform ECM DTC P0335 diagnostic procedure.
  3. Ignition OFF, disconnect PIM connector X1.
  4. Ignition ON, test for 4.8-5.2 volts on the CKP signal circuit, from the CKP sensor connector terminal A and ground.
    • If within the specified range, replace the drive motor generator power inverter control module (PIM).
  5. Test the CKP signal circuit between CKP connector terminal A and PIM connector X1 terminal 26 for a short to ground if less than the specified value or a short to voltage if greater than the specified value.
    • If the circuit tests normal, reconnect all connectors and perform ECM DTC P0335 diagnostic procedure.
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