Passport 4WD V6-3.2L SOHC (6VD1) (1994)
Power Steering Pressure Switch: Testing and Inspection
Circuit Description
The Power Steering Pressure (PSP) Switch is normally open to ground, and GRN/YEL wire will be near the Battery positive voltage. Turning the
Steering Wheel increases Power Steering oil pressure and its load on an idling Engine. The Pressure Switch will close before the load can cause an
idle problem. Closing the Switch causes GRN/YEL wire to read less than 1 volt. The Engine Control Module (ECM) will increase the idle air rate
and disengage the Air Conditioning relay.
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A Pressure Switch that will not close, or an open GRN/YEL wire, may cause the Engine to stop, when Power Steering loads are high.
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A Switch that will not open or a GRN/YEL wire shorted to ground, may affect idle quality and will cause the Air Conditioning Relay to be
de-energized.
Test Description
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Different makes of "Scan Tools" may display the state of this switch in different ways. Refer to "Scan Tool" operator's manual to determine how
this input is indicated.
2. Checks to determine if GRN/YEL wire is shorted to ground.
3. This should simulate a closed Switch.