The ignition system of the Toyota 4Runner Igniter is the electronic switch that quickly breaks and makes the coil current so that the engine fires on time. On early models, the Igniter is mounted inside the distributor, while it is external and governed by the ECU on newer models. The Igniter opens the primary circuit of the coil on the crank or distributor signal, creating each spark's high voltage. A coil with a bad module will never boost voltage, the magnetic field will not collapse, and the engine will only crank. Past designs of the Igniter strapped on centrifugal and vacuum advance, meaning timing still depended on moving parts. Later, distributorless designs gave timing completely over to computer logic reading crank and cam sensors for sharper sparks and cleaner running. The recent configuration eliminates the distributor, utilizes several coils, and enables the ECU and Igniter module to select the precise moment of ignition based on speed, load, temperature, and knock feedback. No matter which Toyota 4Runner you get, the diagnosis remains simple, and that is to verify battery feed at the coil, then watch a test light on the negative side flicker, and this will prove that the Igniter is pulsing. Toyota has made various hardware updates over the years, but replacing a 4Runner is simple enough, requiring basic tools. Just take care with the wire connectors.
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