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Power Steering Oil Pressure Switch Circuit

Component Description
The power steering oil pressure switch is attached to the power steering high-pressure tube and detects a power steering load. When a power steering load is detected, it signals the ECM. The ECM adjusts the IACV-AAC valve to increase the idle speed and adjust for the increased load.

Consult-II Reference Value In Data Monitor Mode:

ECM Terminals And Reference Value:

EC-PST/SW-01:

EC-PST/SW-01 Connector View:

Wiring Diagram

Steps 1 - 3:

Steps 4 - 8:

Diagnostic Procedure

Component Inspection

POWER STEERING OIL PRESSURE SWITCH
1. Disconnect power steering oil pressure switch harness connector then start engine.

2. Check continuity between terminals 1 and 2.
If NG, replace power steering oil pressure switch.