LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2002 >> Rendezvous CX, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1639: 5-Volt Reference 2 Circuit >> Test Description
September 30: LEMON manuals is back up on a temporary server! Slowness is possible

Test Description

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.

scientia non olet · About LEMON Manuals