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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Engine Controls - Self-Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P1639: 5-Volt Reference 2 Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 7

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

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