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Home >> Cadillac >> 2002 >> Eldorado ETC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> 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. 9

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

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