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.
1986 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor
- Remove rubber boot from connector. Turn ignition on and check voltage between each terminal and ground. Open throttle valve and check voltage between each terminal and ground once more.
- If reading is incorrect at terminal "D" only, check throttle sensor setting. If reading is incorrect at any other terminal, check resistance of throttle sensor, terminals "2A", "2C","2E", and "1G" of ECU and wiring harness.
THROTTLE POSITION SENSOR SPECIFICATIONS
| Terminal | Throttle Valve Closed | Throttle Valve Fully Open |
|---|---|---|
| A | .4-.6 Volts | About 4.5 Volts |
| B | Below 1.5 Volts | Below 1.5 Volts |
| C | 4.5-5.5 Volts | 4.5-5.5 Volts |
| D | Below 1.5 Volts | About 12 Volts |
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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