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 Ford Probe GL, AutomaticFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor/Switch
TPS VOLTAGE SPECIFICATIONS
| Application | Closed Throttle Voltage | Wide Open Throttle Voltage |
|---|---|---|
| 4-Cylinder | .9-1.1 | 4.0 |
TPS VOLTAGE SPECIFICATIONS
| Red Wire Reference Voltage | White Wire Closed Throttle Voltage | White Wire Wide Open Throttle Voltage |
|---|---|---|
| 4.50-4.59 | 0.37-0.54 | 3.58-4.23 |
| 4.60-4.69 | 0.38-0.55 | 3.66-4.32 |
| 4.70-4.79 | 0.39-0.56 | 3.74-4.41 |
| 4.80-4.89 | 0.40-0.57 | 3.82-4.51 |
| 4.90-4.99 | 0.40-0.58 | 3.90-4.60 |
| 5.00-5.09 | 0.41-0.60 | 3.97-4.70 |
| 5.10-5.19 | 0.42-0.61 | 4.05-4.79 |
| 5.20-5.29 | 0.43-0.62 | 4.13-4.88 |
| 5.30-5.39 | 0.44-0.63 | 4.21-4.98 |
| 5.40-5.49 | 0.44-0.64 | 4.29-5.07 |
| 5.50 | 0.44-0.66 | 4.29-5.17 |
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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