Ignition Control System - Suzuki DF200 Service Manual

3-18 ENGINE CONTROL SYSTEM

IGNITION CONTROL SYSTEM

OUTLINE
Sensors at specific points on the engine monitor current engine conditions and send signals to the ECM.
Based on these signals, the ECM determines the optimum ignition timing and releases voltage to the ignition
coils.
Basic sensors
MAP sensor:
Informs ECM of collector assembly (surge tank) pressure.
CKP sensor:
Informs ECM of engine speed and crankshaft angle.
Compensating sensors
Cylinder temperature sensor:
Informs ECM of cylinder temperature.
Throttle position sensor:
Informs ECM of throttle opening angle.
Shift position sensor:
Informs ECM of shift position and change.
Switch
Ignition switch:
Informs ECM of "START" signal.
SPECIFICATION
Ignition system
Advance
Ignition timing
Firing order
Ignition timing is determined by a
digital map designed in relation to
collector assembly (surge tank)
pressure and engine speed.
Ignition timing compensation
Spark plug
Full-transistorized ignition
Electronic microcomputer control
BTDC 0° – BTDC 26° (DF200)
BTDC 0° – BTDC 25° (DF225)
BTDC 0° – BTDC 26° (DF250)
1 – 6 – 5 – 4 – 3 – 2
ECM
Signal
Ign.coil