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.
2003 Toyota PriusFACTORY OEM SERVICE PROCEDURE
Inspect Vehicle Speed Sensor Operation
WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 2.
- Connect the positive (+) lead from the tester to terminal 3 and the negative (-) lead to terminal 2.
- Rotate the shaft.
- Check that there is voltage change from approx. 0 volts to 16 volts or more between terminals 2 and 3.
If operation is not as specified, replace the sensor.
NOTE:
The voltage change should be performed 4 times for every revolution of the speed sensor shaft.
Factory Service Tools
Use the Manual With the Right Hardware
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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.