Ignition Control Description - Suzuki DF70A Service Manual

Ignition Control Description

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 intake manifold 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.
IAT sensor:
Informs ECM of intake air temperature.
Switch
Ignition switch:
Informs ECM of "START" signal.
Ignition specification
Ignition system Full-transistorized ignition
Advance Electronic microcomputer control
BTDC 0° ± 5° – BTDC 26° ± 5° (DF70 / 80)
Ignition timing
BTDC 0° ± 5° – BTDC 27° ± 5° (DF90)
Firing order 1 — 3 — 4 — 2
Ignition System:
Z9J0111801002
ECM
Ignition timing is determined by a
digital map designed in relation to
intake manifold pressure and
engine speed.
Ignition timing compensation
Signal
Ign.coil
Spark plug
I9J011180002-01
1H-2