DTC P0551: Power Steering Pressure Sensor Circuit Range/Performance: Description

The Power Steering Pressure Switch (PSPS) converts the existence of a power steering load into a high/low voltage, and inputs it into the ECM (M/T) or PCM (A/T). When steering wheel is turned, hydraulic pressure rises. The PSPS closes and the applied battery voltage will be grounded. With this, the PSPS output voltage will fluctuate between 12 volts and zero volts. While driving with the steering wheel in straight-ahead position, the PSPS turns off. The ECM (M/T) or PCM (A/T) checks whether the PSPS turns off or on during driving.