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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 141 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0010 To DTC P0333) >> DTC P0102 or P0103 >> Component Testing

Component Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

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

  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 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 V.
  7. Start the engine.
  8. 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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