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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (Engine Control System Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P1639: 5-Volt Reference 2 Circuit >> Test Description
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Test Description

WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 7

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