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Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 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. Connect a test lamp between the battery positive voltage circuit terminal 1 X2 at the IAH and ground. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the circuit for an open/high resistance or a short to ground and repair as necessary.
  2. Test the following circuits for an open, a short to ground, or a short to voltage:
    • The IAH command 1 circuit between terminal 31 X2 of the GPCM and terminal 2 X1 of the IAH
    • The IAH command 2 circuit between terminal 26 X2 of the GPCM and terminal 3 X1 of the IAH
    • The IAH voltage signal circuit between terminal 30 X2 of the GPCM and terminal 5 X1 of the IAH
    • If a condition was found on any of the circuits repair as necessary.
  3. Connect any circuits that were disconnected. With the ignition ON and the engine OFF, observe that the scan tool displays the IA Heater Undervoltage parameter as OK.
    • If the IA Heater Undervoltage parameter displays Fault, replace the intake air heater.
    • If the IA Heater Undervoltage parameter does not display Fault, replace the GPCM.
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