2002 Buell S3T: Fuel System 4-31
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NO ECM POWER 4.13
GENERAL
A relay controlled by the engine stop switch supplies power to
the ECM. The relay requires a ground to operate. If the
ground is not established, the ECM will not receive power.
Grounds may be established three ways.
● By placing the motorcycle in neutral and grounding the
relay through the neutral switch. See Figure 4-27.
● By retracting the side stand and grounding the relay
through the side stand switch. See Figure 4-28.
● By disengaging the clutch and grounding the relay
through the clutch switch. See Figure 4-29.
If the ECM does not appear to be receiving power, check the
ground sources. A blown ignition fuse can also disable the
ECM.
DIA GNOSTICS
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the Test 4.13 flow chart.
1. Connect BREAKOUT BOX (Part No. HD-42682) to ECM.
See 4.7 BREAKOUT BOX.
Figure 4-27. Neutral Switch
Neutral Switch behind
Transmission Sprocket
6753
Figure 4-28. Side Stand Switch
Figure 4-29. Clutch Switch
8305
Sidestand
Switch
Plunger
6938
1. Connector [95]
2. Clutch Switch
1
2
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