Power Steering Pressure Switch: Testing and Inspection

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-FICD solenoid valve to increase the idle speed and adjust for the increased load.




CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and (128) (ECCS ground).







DIAGNOSTIC PROCEDURE




WIRING DIAGRAM

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).

IACV-FICD Solenoid Valve
Disconnect IACV/FICD solenoid valve harness connector.







- Check for clicking sound when applying 12V direct current to terminals.
- Check plunger for seizing or sticking.
- Check for broken spring.