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Home >> GMC >> 2002 >> Envoy 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.2L >> System Tests >> Malfunction Indicator Lamp Inoperative >> Test Description

Test Description

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

  1. 3

    This step determines if the condition is with the MIL control circuit or the PCM.

  2. 4

    This step determines if a voltage is constantly being applied to the control circuit.

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