Lemans FWD L4-121 2.0L (1989)
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Power Steering Pressure Switch: Description and Operation
Power Steering Pressure Switch
The Power Steering Pressure Switch (PSPS) opens during high pressure power steering situations. When the power steering switch is open, power to the
A/C relay is shut off, resulting in air conditioning compressor clutch disengagement. A signal is also sent to the ECM. The ECM uses this signal for idle
speed control. A Scan tool should read "off" normally, and "on" with high pressure.