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.

Ensures no faults exist in injector control and ignition feed wiring.
Checks for open or grounded injector feed circuit.
Checks for grounded injector drive circuit.
Checks for an open injector drive circuit.

Fig 1: Code P1200 Schematic (3.8L) Injector Circuit Fault

Fig 2: Code P1200 Diagnostic Flow Chart (3.8L) Injector Circuit Fault