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When you turn the crank to TDC (as observed with the markings on the harmonic balancer) you'll note that there is a small cylindrical object inserted into the balancer which is directly under the sensor. It's a small magnet. The sensor senses this magnet at each crank rotation as it passes by. The sensor passes this timing signal information to the ignition control unit, which uses it to operate the sparkplugs at the correct time. Other units use this information also, such as the tachometer and the fuel pump relay.
Gilly
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