Power Steering Pressure Switch: Description and Operation

Power Steering Pressure Switch:

PURPOSE
Provides information to the ECM of increased load produced by the power steering system.

OPERATION
Turning the steering wheel increases power steering oil pressure and creates a load on an idling engine. The pressure switch will close before the load can cause an idling problem.

Closing the switch causes the circuit to report less than 1 volt to the ECM. The ECM will then increase the idle speed and retard the timing.