Test Description

WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Test numbers refer to numbers on diagnostic chart.

If QDM No. 4 related symptoms are present, checks on Code P1670 (2 OF 2) chart should isolate cause of fault.
Determines which circuit is out of specification.
Determines if problem is circuit or component.
As factory installed PCM is protected with an internal circuit breaker, it is highly unlikely that PCM needs to be replaced.

Fig 1: Code P1670 Schematic (3.8L) QDM No. 4

Fig 2: Code P1670 Diagnostic Flow Chart (3.8L) QDM No. 4