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Home >> Chevrolet >> 2002 >> Impala Base, 3.4 E >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.4L >> Diagnostic Tests >> DTC P1639: 5-Volt Reference 2 Circuit >> Test Description

Test Description

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.
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