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.