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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1057 (Engine Controls And Fuel - 6.6L - DTC P1224 To DTC P2463) >> DTC P154B >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 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 following circuits for an open, a short to ground, or a short to voltage:
    • The IAH command 1 circuit
    • The IAH command 2 circuit
    • The IAH voltage signal circuit
    • If a condition was found on any of the circuits repair as necessary.
  2. Connect any circuits that were disconnected. With the ignition ON and the engine OFF, observe that the scan tool displays the IA Heater Driver Shorted parameter as OK.
    • If the IA Heater Driver Shorted parameter displays Fault, replace the intake air heater.
  3. With the ignition ON and the engine OFF, observe that the scan tool displays the Glow Plug Driver Shorted parameter as OK.
    • If the Glow Plug Driver Shorted parameter displays Fault, replace the Glow Plug Control Module.
    4. IMPORTANT: Set the DMM to the 4V DC hertz scale.
  4. Disconnect the IAH. Turn ON the ignition. 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.
    5. IMPORTANT:
    • Do not install the jumper wire between 12 volts and the command circuit for more the 20 seconds.
    • Set the DMM to the 4V AC hertz scale.
  5. Turn OFF the ignition. Install a jumper wire between the IAH harness temperature signal circuit terminal 1 and the corresponding terminal on the IAH.
  6. Install a jumper wire between the IAH harness command two circuit terminal 3 and the corresponding terminal on the IAH.
  7. Supply 12 volts to terminal 2 on the IAH.
  8. Turn ON the ignition. Measure for 1 hertz on terminal 5 at the IAH.
    • If 0.7-1.1 hertz is measured on terminal 5, replace the GPCM.
    • If 0.7-1.1 hertz is not measured on terminal 5, replace the IAH.
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