2002 Buell S3T: Electrical 7-3
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IGNITION SYSTEM 7.2
GENERAL
The vehicle uses a breakerless inductive-discharge ignition
system. The system has both a primary and secondary cir-
cuit. The primary circuit consists of the battery, ignition
switch, primary coil windings, computerized ignition timer and
associated wiring. The secondary circuit consists of the sec-
ondary coil, spark plugs and associated wiring.
See Figure 7-3
The scan tool can access the information received by and
stored in the electronic control module.
The electronic control module (ECM) attaches to the vehicle
frame next to the fuse block. The module has three primary
functions. First, it computes the spark advance for proper
ignition timing based on sensor input. Second, it controls the
independent, primary windings of the spark coil and is thus
able to provide sequential and independent firing of the spark
plugs (non waste spark). Third, it calculates the correct air/
fuel ratio based on input from the sensors.
Figure 7-1. Ignition System Components
DDFI
1
2
4
56
10
11
14
13
12
17
16
19
15
18
3
7
8
9
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1. Pop Rivet (2)
2. Timer Cover
3. Screw (2)
4. Inner Cover
5. Timer Plate Stud (2)
6. Bolt
7. Cam Position Sensor (CMP)
8. Trigger Rotor
9. Seal
10. Gearcase Cover
11. Spark Plug (2)
12. Ignition Coil
13. Front Spark Plug Cable
14. Rear Spark Plug Cable
15. Cable Strap
16. Terminal Pin
17. CMP Connector [14]
18. Secondary Lock
19. Ignition Module
20. Washer (2)
21. Screw (2)
21
20
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