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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 377 (Engine Controls - Self-Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P0101: Mass Airflow Sensor Performance >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Sonoma, 2003 GMC Safari, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. 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 responds 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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