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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 398 (Engine Controls - Self Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P0101: Mass Air Flow Sensor Performance >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra 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 procedures.

  1. 5

    This step will determine if the MAP sensor pressure is within the proper range for a given altitude.

  2. 6

    This step will determine if the MAP sensor voltage is within the proper range at idle.

  3. 7

    This step will determine if the MAP sensor is operating properly to the change in manifold pressure.

  4. 8

    This step will determine if the TP sensor is operating properly.

  5. 9

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

  6. 10

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

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