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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 931 (Engine Controls And Fuel - 6.6L (LMM) - DTC P0016 To DTC P0299) >> DTC P0102 or P0103 >> Component Testing

Component 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 Testing in order to verify the integrity of the MAF sensor circuits before proceeding with the Component Testing.

To determine if the ECM can properly process the MAF sensor frequency signal, connect the J 38522  to the vehicle as follows:

  1. Turn OFF the ignition.
  2. Connect the battery voltage supply and ground the black lead.
  3. Connect the red lead to the signal circuit terminal A of the MAF sensor.
  4. Set the duty cycle switch to Normal.
  5. Set the Frequency switch to 5 K.
  6. Set the signal switch to 5 volts.
  7. Start the engine, observe the MAF Sensor parameter for the correct range of 4,950-5,025 Hz.
    • If the MAF Sensor parameter is not within the specified range, replace the ECM.
    • If the MAF Sensor parameter is within the specified range, replace the MAF sensor.
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