Diagnostic Aids

WARNING: This page is about a different car, the 1994 Oldsmobile Ninety-Eight and 1994 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside insulation. Check for:

Poor Connection Or Damaged Harness

Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.

Fig 1: Code P1530 Schematic (3.8L) A/C Head Pressure Switch

Fig 2: Code P1530 Flow Chart (3.8L) A/C Head Pressure Switch