Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Eagle Premier ESFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor (TPS) Test
- Disconnect TPS electrical connector. The TPS is mounted on throttle body, connected to throttle valve shaft. Turn ignition on. Using a DVOM, backprobe TPS harness connector between terminals "B" and "C" (marked on connector).
- Voltmeter should read approximately 5 volts. If voltmeter reading is incorrect, test vehicle with Diagnostic Readout Box (DRB-II) and Jeep/Eagle adapter or similar scan tool. See appropriate G - TESTING W/CODES article. If voltmeter reading is correct, go to next step.
- Turn ignition off. Check for continuity between TPS terminal "B" and ground. If circuit is open, test vehicle with DRB-II and Jeep/Eagle adapter or similar scan tool. If continuity is present, go to next step.
- Reconnect TPS electrical connector. Turn ignition on. Measure voltage between TPS terminal "A" and ground. Voltmeter should read approximately .5-1.0 volt.
- If voltmeter reading is correct, TPS is okay. If voltmeter reading is incorrect, attempt to adjust TPS. See appropriate ADJUSTMENTS article. If TPS cannot be adjusted within specification, replace TPS.
Factory Service Tools
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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.
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