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.
1991 Subaru XT StandardFACTORY OEM SERVICE PROCEDURE
6-Cylinder Throttle Position Sensor
NOTE:
All testing procedures are performed with engine at normal operating temperature.
- Disconnect TPS electrical connector. Insert a .014" (.35 mm) feeler gauge between throttle lever and throttle screw. Connect an ohmmeter between Black wire and Gray wire at TPS terminals. Maximum resistance should be 5000 ohms. Remove feeler gauge.
- Insert a .030" (.75 mm) feeler gauge between throttle lever and throttle screw. Ohmmeter should indicate infinity. Remove feeler gauge. Connect ohmmeter between Black/White wire and Black wire. Ohmmeter should indicate 3000-7000 ohms.
- Connect ohmmeter between Green/Black wire and Black wire. With throttle valve closed, ohmmeter should read 4200-15,000 ohms. Open throttle valve to wide open throttle position. Ohmmeter should indicate 100-11,000 ohms.
- Close throttle valve. With ohmmeter connected to Green/Black wire and Black wire, slowly open throttle. Ohmmeter reading should change smoothly as throttle goes from idle to wide open position.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.