FF - Testing Notes

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


REMEMBER


To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault.

- Idle speed/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:


- Power steering pressure switch

- Harness circuits: PSPS, and SIG RTN

- Processor assembly


DESCRIPTION

The Power Steering Pressure Switch (PSPS) is a normally closed switch that opens as pressure increases. The processor uses the signal from the PSPS to adjust idle speed to compensate for the additional load on the engine.