Ignition Timing Control - Yamaha F225F Service Manual

Ignition timing control

In ignition timing control, the engine ECM uses signals from the sensors to assess engine operating
conditions and determines the basic ignition timing and ignition coil energization time. The engine
ECM also applies various restrictions and compensations to determine the actual ignition timing.
The ignition timing is also controlled according to the knock control. See "Knock control" (2-11).
Pulser coil
Cam position sensor
(PORT EX)
Cam position sensor
(PORT IN)
Cam position sensor
(STBD IN)
TPS
LPS
SPS
Air pressure sensor
Engine temperature sensor
Knock sensor
Engine shut-off switch
Battery
Electronic control system
Engine
ECM
0
1
2
3
4
5
Ignition coil
6
7
8
9
10
A
2-8