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.
Engine Speed Sensor
The engine speed sensor is actuated by the teeth of the flywheel. It produces 135 impulses for each crankshaft revolution (1 for each flywheel tooth). Signals are used to determine engine speed and ignition timing.
The fuel/timing control unit calculates engine speed by counting the number of flywheel teeth passing the sensor in a given unit of time. By counting the number of teeth passing the sensor after the reference mark pin, it determines crankshaft position.
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.