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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1661 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P1448 Top DTC P2510) >> DTC P2510 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. With the ignition ON, disconnect the KR75 powertrain relay and observe with the scan tool for loss of communication.
    • If the scan tool can still communicate with the vehicle, test the ignition voltage circuit supplied by the powertrain relay for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  2. With the ignition OFF, probe the relay control circuit terminal 87 at the underhood electrical center with a test lamp connected to B+.
    • If the test lamp illuminates, test the relay control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, probe the relay control circuit terminal 86 at the underhood electrical center with a test lamp connected to ground.
    • If the test lamp illuminates, test the relay control circuit for a short to voltage.
  4. If all circuits test normal, replace the KR75 powertrain relay.
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