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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 421 (Engine Control System Self-Diagnostics - 3.8L) >> Diagnostic Tests >> DTC P0103: MAF Sensor Circuit - High Frequency >> Test Description

Test Description

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

  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. 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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