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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 438 (Engine Control System - Self-Diagnostics - 5.3L) >> Diagnostic Tests >> DTC P0103: Mass Air Flow Sensor Circuit - High Frequency >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. 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. 3

    This step tests for Electromagnetic Interference (EMI) on the signal circuit of the MAF sensor. A frequency reading with the MAF sensor disconnected indicates an EMI related fault or a poor connection at the PCM. Disconnecting the MAF sensor may set additional related DTCs.

  2. 4

    This step will determine if incorrect harness routing has caused this DTC to set.

  3. 5

    This step will determine if water intrusion has caused this DTC to set.

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