Ignition Signal System - Suzuki F6A Service Manual

IGNITION SYSTEM

Ignition signal system

Shown below is the basic ignition signal circuit.
The ECM calculates the energizing time and ignition timing based on the signals from sensors. Instructions for the start
of passing the electricity to the igniter and for the ignition timing are given by using the IGt signal from the ECM. That is,
passing the electricity starts at the rise of the IGt signal and the ignition at its fall.
When the IGt signal rises, the TR2 of the igniter turns ON to cause the primary current to flow into the ignition coil and
when it falls, the TR2 turns OFF and the current in the primary coil is shut off, thereby a high voltage is generated in the
secondary coil to ignite the spark plug.
1. Igniter (Power unit)
2. Ignition coil
3. Distributor
4. CAS
5. MAP (Pressure Sensor)
6. TPS
7. WTS
8. Vehicle speed sensor
9. Battery voltage
10. Test switch terminal
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