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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P1639: 5-Volt Reference 2 Circuit >> Test Description

Test Description

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

  1. 7

    The ignition must be turned OFF and the PCM powered down or the test may become inaccurate.

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