Yamaha Tracer MT09TRA - Service manual > Ignition system

Circuit diagram

3. Main switch

4. Main fuse

11.Ignition fuse

15.Battery

16.Engine ground

17.Fuel injection system fuse

20.Joint connector

21.Joint coupler

22.Relay unit

25.Sidestand switch

27.ECU (engine control unit)

28.Ignition coil #1

29.Ignition coil #2

30.Ignition coil #3

31.Spark plug

39.Crankshaft position sensor

44.Lean angle sensor

66.Gear position switch

69.Handlebar switch (right)

71.Start/engine stop switch

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 switch (neutral circuit) and sidestand switch are set to "OFF", thereby preventing the spark plugs from producing a spark. However, the engine continues to run under the following conditions:

• The transmission is in gear (the neutral circuit of the gear position switch 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 switch is closed) and the sidestand 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)

11.Gear position switch (neutral circuit)

12.Battery negative lead

Troubleshooting

The ignition system fails to operate (no spark or intermittent spark).

TIP

• Before troubleshooting, remove the following part(s):

1. Fuel tank front cover/Front side panel/Front side cowling

2. Passenger seat/Rider seat

3. Fuel tank cover

4. Fuel tank

5. Air filter case

See also: