NOTE: Throttle Position Sensor (TPS) is not adjustable. Refer to appropriate procedure as follows to isolate and correct cause of an out-of-calibration sensor.

Connect Breakout Box (T83L-50-EEC-IV), leaving ECA disconnected. Connect digital voltmeter positive lead to test pin No. 47 and negative voltmeter lead to test pin No. 46. Turn ignition on. Slowly depress accelerator pedal. Check voltmeter reading and compare it to specification in TPS VOLTAGE SPECIFICATIONS table.
If voltage is not as specified, ensure throttle stop screw and linkage are adjusted correctly. See Figure. Remove sensor. Check sensor for damaged, corroded or misadjusted pins. If pins are okay, install sensor. Ensure sensor is seated correctly. Repeat step 1). If voltage is not as specified, replace sensor and perform KOEO self-test. See G - EEC IV TESTS W/ CODES article in the ENGINE PERFORMANCE Section.

TPS VOLTAGE SPECIFICATIONS

Throttle Angle	(1) Voltage
0°	.50
10°	.97
20°	1.44
30°	1.90
40°	2.37
50°	2.84
60°	3.31
70°	3.78
80°	4.24
- Voltage values may vary as much as 15 percent

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Throttle Position Sensor (TPS) Adjustment

Use the Manual With the Right Hardware

When to See a Mechanic

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