Throttle Position Sensor: Adjustments

Potentiometer, Adjust

This procedure can be used on all models in the absence of tester MS 1700. However, this procedure must be used for Fuego and Sportwagon models with 2.2L engines, as the tester will not detect an incorrectly adjusted potentiometer on these models. Prior to performing adjustment, verify correct accelerator pedal travel and adjust linkages as needed to ensure wide open throttle is obtained with pedal fully depressed.

1. Remove air cleaner assembly, as needed, and place ignition switch in on position.
2. Connect voltmeter positive lead to potentiometer connector terminal B, and negative meter lead to connector terminal A, Fig. 3. Insert voltmeter probes into rear of potentiometer connector (J), leaving potentiometer connected to computer.
3. Move throttle lever to wide open throttle position. Voltmeter should indicate potentiometer input voltage (3.8-4.8 volts).
4. Record input voltage, release throttle and disconnect voltmeter positive lead from connector terminal B.
5. Insert positive voltmeter lead into potentiometer connector terminal C.
6. Hold throttle lever in wide open throttle position and read output voltage on meter.
7. Adjust potentiometer to obtain an output voltage equal to 4% of the measured input voltage. To obtain desired output voltage, multiply measured input voltage by 0.04.
8. Adjust potentiometer as follows:
a. Block throttle in wide open position.
b. Loosen retaining screws, and pivot potentiometer to obtain calculated output voltage reading.
c. Tighten retaining screws and recheck output voltage.
d. Repeat adjustment until output voltage is within specifications.