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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Controls Self-Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P1639: 5-Volt Reference 2 Circuit >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sonoma, 2002 GMC Safari, 2002 GMC Jimmy, 2002 Chevrolet S10 Pickup, and 2002 Chevrolet Blazer. 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 procedures.

  1. 7

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

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