Circuit Description

Power Steering Pressure (PSP) sensor switch is normally closed switch which opens when power steering pressure exceeds 450-650 psi (31-46 kg/cm² ). The PSP switch closes again when pressure drops to less than 100-450 psi (7-31 kg/cm² ). The PCM pulls the PSP signal circuit up to about 12 volts. This DTC monitors voltage on PSP switch signal circuit. During power steering no-load condition, the PSP switch is closed causing the signal voltage to be pulled low. When a load is placed on power steering such as during low speed parking maneuvers or at full steering lock, the switch opens and PCM will detect 12 volts on signal circuit. The PCM uses this information to adjust idle speed when additional load is present. DTC will set when PSP signal voltage is high for 60 seconds.