Yamaha FZ09E Service Manual page 338

IGNITION SYSTEM
EA$1AC18'M
ENGINE STOPPING DUE TO SIDESTAND OPERATION
When the engine is running and the transmission is in gear, the engine will stop if the sidestand is
moved down. This is because the electric current from the ignition coils does not flow to the ECU when
both the gear position sensor (neutral circuit) and sidestand switch are set to "OFP', thereby preventing
the spark plugs from producing a spark. However, the engine continues to run under the following con-
ditions:
• The transmission is in gear (the neutral circuit of the gear position sensor is open) and the sidestand
is up (the sidestand switch circuit is closed).
• The transmission is in neutral (the neutral circuit of the gear position sensor is closed) and the sides-
tand is down (the sidestand switch circuit is open).
1. Battery
2. Main fuse
3. Main switch
4. Ignition fuse
5. Start/engine stop switch
6. Ignition coil
7. Spark plug
8. ECU (engine control unit)
9. Sidestand switch
10.Relay unit (diode)
10
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11
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..:-
11. Gear position sensor (neutral circuit)
12. Battery negative lead
12 2
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