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.
1994 Subaru Loyale AutomaticFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor/Switch
- With ignition off, unplug TPS connector, located at throttle body. Measure and record resistance between terminals "B" and "D". See Fig 1 . Measure and record resistance between terminals "B" and "C" with throttle fully closed, then with throttle fully open.
- If necessary, loosen retaining screws and rotate TPS until correct resistance is obtained. See 4-CYLINDER THROTTLE POSITION SENSOR RESISTANCE table. Replace TPS if resistance cannot be adjusted to specification.
4-CYLINDER THROTTLE POSITION SENSOR RESISTANCE
| Application | Ohms | |
|---|---|---|
| Terminals "B" & "D" | 3500-6500 | |
| Terminals "B" & "C" | ||
| Throttle Fully Closed | Less Than 1000 | |
| Throttle Fully Open | More Than 2400 | |
NOTE:
All testing procedures are performed with engine at normal operating temperature.
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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