Crankshaft position sensor, location/task/design/function

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Mounting location:
The engine speed sensor is located on the flywheel housing.
Constructional details:

 Built-in pick up coil.

 Timing rotor attached to the crankshaft and provided with 58 dead holes with a gap between the start hole and the end hole.

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 As a result of 58 dead holes in the flywheel. Sinusoidal-like voltage amplitude is induced in the built-in and pick up coil when flywheel rotates and passes through sensor.

 The increase and decrease of magnetic flux occurring when the slots pass through the pick up coil, generates the electromotive force on the coil.

 The voltage amplitude is amplified by a permanent magnet. The level of Induced voltage is dependent on clearance between flywheel and the crankshaft angle position sensor, as well as on the speed of the engine.

 The long gap after 58 slots marks the position of the piston of the first cylinder in top dead center position.

 The generated pulses are converted into rectangular waves by the input circuit in the engine electronic control unit, thus generating alternating current voltage.

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General check points:

 Inspect wiring at plug connection for pin numbers 39, 54 and 38, check and correct connection, if required.

 Check and remove metal chips, if found.

 Check the rotor for any damage.

 Examine the position sensor for mechanical damages by pulling out the sensor, after stopping the engine and replace if required.

Installation guidelines:

 The sensor must be mounted perpendicular to the surface of the flywheel housing using respective mounting aluminum plate.

 Avoid using a screw driver to fit the sensor. After fitment ensure seating of the sensor holder face.

 A quick diagnosis can be performed by verifying whether the engine RPM is getting displayed while cranking.