FF - Testing Notes

DESCRIPTION
The Power Steering Pressure (PSP) switch is a normally closed switch that opens as pressure increases. The Powertrain Control Module (PCM) uses the signal from the PSP switch to adjust idle speed to compensate for the additional load on the engine.

NOTE
You should enter this Pinpoint Test only when you have been directed here from Diagnostic Routines.

REMEMBER
To prevent the replacement of good components, be aware that the following non-Electronic Engine Controls (EEC) areas may be at fault:

- Idle Air Control throttle stop adjustment

- Binding throttle shaft/linkage or speed control linkage

- Power steering hydraulic system

This Pinpoint Test is intended to diagnose only the following:

- PSP switch

- Harness circuits: PSP and SIG RTN

- PCM