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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 942 (Engine Controls And Fuel - 6.6L (LMM) - DTC P154B To DTC P2693) >> DTC P154C >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Test the IAH current signal circuit for an open, a short to ground, or a short to voltage:
    2. IMPORTANT: Set the DMM to the 4 v DC hertz scale.
  2. With a DMM measure between command 2 circuit terminal 3 and a good ground on the harness side of the connector for 0.78-1.1 Hz.
    • If the DMM does not measure between 0.78-1.1 Hz ohms, replace the GPCM.
    3. IMPORTANT:
    • Do not install the jumper wire between 12 volts and the command circuit for more the 20 seconds.
    • Set the DMM to the 4 v AC hertz scale.
  3. Turn OFF the ignition. Install a jumper wire between the IAH harness temperature signal circuit terminal 1 and the corresponding terminal on the IAH.
  4. Install a jumper wire between the IAH harness command two circuit terminal 3 and the corresponding terminal on the IAH.
  5. Supply 12 volts to terminal 2 on the IAH.
  6. Turn ON the ignition. Measure for 1 hertz on terminal 4 at the IAH.
    • If 0.7-1.1 hertz is measured on terminal 4, replace the GPCM.
    • If 0.7-1.1 hertz is not measured on terminal 4, replace the IAH.
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