Detection Condition

• DTC P1650 indicates PSP signal to PCM is high during KOEO or PSP signal did not change state during KOER.
• DTC P1651 indicates PSP signal is open or shorted. (PCM expects PSP signal to change after a calibrated number of speed transitions).

PSP monitors hydraulic pressure within power steering system. PSP switch is a normally closed switch that opens as hydraulic pressure increases. PCM uses input signal from PSP switch to compensate for additional loads on engine by adjusting idle RPM and preventing engine stall during parking maneuvers. It also signals PCM to adjust transmission Electronic Pressure Control (EPC) during increased engine load.