Power Steering Pressure (PSP) Switch

DESCRIPTION
The power steering pressure switch is located on the power steering pressure hose between the power steering pump and rack and pinion gear.

OPERATION
The power steering pressure switch is normally closed and provides a battery voltage signal to the PCM with no power steering load. When power steering pressure increases to a calibrated level due to steering load (such as full steering lock), the switch opens and causes the signal voltage to the PCM to drop to 0 volts.

The PCM uses the power steering pressure switch signal for idle speed control during high steering loads to maintain a stable idle. A shorted power steering pressure switch may cause a stumble or stall during steering loads and an open switch should set a PCM DTC.