The Toyota Camry Ignition System comprises of engine control module (ECM), igniter, ignition coil, distributor and pickup coils. The ECM is programmed with data (rpm, intake air volume, engine temperature, etc.) for optimum ignition timing under all operating conditions. The igniter temporarily interrupts the primary current with the ignition signal (lGT signal) from the ECM and generates sparks at the spark plug. Below schematic depicts the Toyota Camry Ignition System Wiring and System Circuit. This correctly distributes high voltage to the spark plug of each cylinder in the specified ignition order.
To maintain the most appropriate ignition timing, the ECM sends a control signal so that the igniter sends current to the ignition coil and the spark plugs produce a spark.