Throttle Position (TP) Sensor
The TP sensor is a potentiometer. The resistance of the sensor varies with throttle opening. The ECA applies a reference voltage to the sensor and the resultant sensor output voltage allows the ECA to determine throttle position (closed throttle, part throttle or wide open throttle). This information is used by the ECA in determining the proper amount of spark advance, EGR flow, air/fuel ratio and the proper thermactor air mode.
NOTE:
The throttle position (TP) sensor mounting holes are slotted to permit rotational adjustment. If sensor is replaced, it must be correctly positioned or erroneous throttle information will be sent to the ECA.