Test Notes

NOTE: You should enter this pinpoint test only when you have been directed here from diagnostic routines.

To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault:
- Idle speeds/throttle stop adjustment
- Binding throttle shaft/linkage or speed control linkage
- Throttle Position (TP) sensor that may not be seated properly (tightened down)

This pinpoint test is intended to diagnose only the following:
- TP sensor
- Sensor harness circuits: VREF, TP, and SIG RTN
- Powertrain Control Module (PCM)





DESCRIPTION
The TP sensor is a potentiometer that sends a signal to the PCM which is directly proportional to throttle plate position.