Power Steering Pressure Switch: Description and Operation
DESCRIPTIONThe Power Steering Pressure (PSP) switch signals the Powertrain Control Module (PCM) when the vehicle is in need of power steering assist.
OPERATION
The turning of the steering wheel causes increased power steering fluid pressure which will close the PSP switch. The PCM uses this signal to control the Idle Speed Control (ISC) motor to raise the idle speed before the load can cause a poor idling condition.