Expedition 4WD V8-5.4L VIN 5 (2006)
Power Steering Pressure Switch: Description and Operation
Power Steering Pressure (PSP) Sensor
POWER STEERING PRESSURE (PSP) SENSOR
Typical Power Steering Pressure (PSP) Sensor
The PSP sensor monitors the hydraulic pressure within the power steering system. The PSP sensor voltage input to the PCM changes as the hydraulic
pressure changes. The PCM uses the input signal from the PSP sensor to compensate for additional loads on the engine by adjusting the idle RPM and
preventing engine stall during parking maneuvers. Also, the PSP sensor signals the PCM to adjust the transmission electronic pressure control (EPC)
pressure during increased engine load, for example during parking maneuvers.
