Toyota 3S-GE Repair Manual page 423

IGNITION SYSTEM — DESCRIPTION 'G-3
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AM2 40A Ignition Main Relay
N Spark Plug ("lGN")
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Ignition Coil
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The ECU monitors the engine condition by signals from each sensor, calculates the ignition timing
and sends an ignition signal to the igniter. High voltage from the ignition is distributed to each
spark plug in the appropriate order to generate a spark between the electrodes, which ignites the
air—fuel mixture.
IGNITER
The igniter temporarily interrupts the primary current with the ignition signal (IGT signal) from the
ECU and generates sparks at the spark plug. Also, as a fail—safe measure, when ignition occurs
an ignition confirmation signal (IGF signal) is sent to the ECU.
IGNITION COIL
The ignition coil uses a closed core coil with the primary coil wrapped around the core and the
secondary coil wrapped around the primary coil. This allows the generation of a high voltage
sufficient to cause a spark to jump across the spark plug gap.
DISTRIBUTOR
This correctly distributes highvoltage to the spark plug of each cylinder in the specified ignition
order.
PICKUP COILS
The NE coil detects the crankshaft angle, and the G1 and G2 coils detect the camshaft angle.