Operation Test

DESCRIPTION
Check operation of the Power Steering Pressure (PSP) switch if either or both of the following concerns are noted:
- Engine stalls during parking maneuvers.
- Engine idles at high rpm.

PROCEDURE
The following test is based on the fact that the PSP switch is normally closed. As power steering load increases, the PSP switch opens and increases the idle speed.
1. Disconnect the electrical connector at the PSP switch.
2. Connect the Rotunda 73 Digital Multimeter 105-R0051 or equivalent, across the PSP switch terminals.
3. Start engine and let idle.
4. PSP switch should be normally closed (zero ohms) with steering wheel straight ahead.
5. Turn steering toward either stop while watching the multimeter. PSP switch should open near the stops (no continuity or infinite reading on ohmmeter).
6. If PSP switch fails either test, replace it. If PSP switch is OK, check the engine idle speed control system.