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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 370 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P0105: Map Sensor Circuit - Insufficient Activity >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refers to the step numbers in the diagnostic procedures.

  1. 4 -  This step tests the ability of the MAP sensor to correctly indicate BARO.
  2. 6 -  This step tests the MAP sensor's ability to respond to an increase in engine vacuum.
  3. 8 -  This step tests for a proper MAP sensor pressure with an applied vacuum.

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