Throttle Position Sensor: Adjustments

Throttle Position Sensor:

NOTE: This procedure can be used to check and adjust level "C" sensor only.

1. Install an EEC-IV breakout box (Rotunda part# T83-50 EEC-IV, or equivalent) to the vehicle.
2. Set a DVOM (Rotunda part# 014-00407, or equivalent) to the 20 volt scale. Insert the positive lead into test socket 47 and the negative lead into socket 46 of the breakout box.
3. Turn the ignition ON, but DO NOT start the vehicle.
4. Check the reading on the DVOM. If it is not 0.9-1.1 volts, loosen the Throttle Position (TP) sensor mounting screws and rotate the sensor until the voltage falls within this range.
5. Tighten the mounting screws to 11-16 lb. in. (1.2-1.8 N-m).
6. While observing the DVOM, move the throttle through the entire range of motion. The reading should go from 1.0 volt to at least 4.0 volts and back to 1.0 volt.
7. If the TP sensor cannot be adjusted, replace the sensor.
8. Perform an EEC-IV quick test on the vehicle.