Toyota Tacoma Igniter controls the ignition coil current and regulates the switching that generates high voltage spark that allows the vehicle to start immediately and run smoothly. The Igniter functions like the electronic heart of the ignition system. It receives a low current signal from the key driven relay or the crank and cam sensors. The Igniter then opens and closes the coil circuit fast enough to collapse the magnetic field and thus create the 15,000 to 40,000 volt surge sent to the spark plugs. The early Toyota Tacoma models had an Igniter connected to an electronic distributor. In these models, timing is still controlled by centrifugal and vacuum means, whereas later Tacoma models switched to a distributorless layout where the Igniter receives orders from the engine control computer for fully automatic timing. The distributor style is located inside or beside the distributor housing and is only applied to handle primary current. The newer style integrates sensor data so it is able to advance or retard spark based on speed, load and knock signals for better fuel economy and reduced emissions. These upgrades allowed Toyota to obtain stronger performance, and when it fails, the engine usually cranks with no spark until the faulty Igniter is swapped with simple hand tools and a DVOM.
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