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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 413 (Engine Controls - Self Diagnostics - 8.1L) >> Diagnostic Tests >> DTC P0102: Mass Air Flow Sensor Circuit - Low Frequency >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Suburban, and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 5

    This step will determine if any mechanical faults have caused this DTC to set.

  2. 7

    This voltage drop test will determine if high resistance has caused this DTC to set.

  3. 9

    This step verifies the signal circuit from the MAF sensor electrical connector to the PCM.

  4. 10

    This step tests the signal circuit of the MAF sensor for a short to another 5-volt reference circuit.

  5. 11

    This step will determine if the PCM is able to process the frequency signal that it receives from the MAF sensor.

  6. 14

    This step will determine which portion of the circuit or which component is shorted to ground.

  7. 17

    This step verifies that the signal circuit is not shorted to any other PCM circuit.

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