The electronic Igniter controls the ignition coil's circuit. The driver turns on and off very quickly, energizing and de-energizing the coil, respectively. The Igniter is concealed behind more familiar plugs and coils. The Igniter receives timing signals from either the distributor pickup on older cars or a crankshaft sensor on newer setups, breaking the primary current so the collapsing magnetic field can boost the voltage for each plug. Early Toyota Tercel models incorporated an Igniter affixed to a distributor. The Tercel also utilized a manual centrifugal and vacuum advance. As a result, mechanism set the base timing with a light while the module operated simply on off duty. In later versions of the Tercel, they implemented a distributorless system, with the Igniter usually near the coil pack and working with the engine control computer. Unlike before, the computer now dictates initial timing and advance based on sensor information on speed, load, coolant temperature, and knock. In every Toyota version, a no-spark condition provides the same simple failure clues. The flicker-free test light at the coil negative indicates a sure sign of trouble. The two styles can be easily replaced using basic tools, and unplugging them carefully will prevent any damage to the connector. This means that Toyota drivers can operate with confidence, knowing that their Igniter will deliver a reliable fire to each cylinder.
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