4-58 2003 Buell XB9S: Fuel System
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TROUBLE CODE 16 4.20
GENERAL
Battery Voltage
A Code 16 will set if the ECM detects battery positive voltage
less than 6 volts or greater than 20 volts.
● A low voltage condition typically occurs during activation
of the starter or generally indicates loose wire connec-
tions.
● A high voltage condition is usually caused by a faulty
voltage regulator.
DIAGNOSTICS
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the Code 16 flow charts.
1. The ECM is monitoring voltage at ECM connector [10]
(black) Terminal 1. Connect BREAKOUT BOX (Part No.
HD-42682) to ECM. See 4.6 BREAKOUT BOX.
2. This checks for voltage drops in the ECM power circuit. If
a significant voltage drop is not present, condition may
be caused by excessive starter current draw.
Figure 4-43. Fuses and Diodes
Spare
Battery
ECM
Key Switch
Accessory
Ignition
Cooling Fan
Brake/Horn
Diode 2
Diode 1
15
7.5
7.5
15
15
7.5
15
7.5
15
a
x
Lights
Spare
30
Figure 4-44. Fuse Block and Electrical Relays
1. Fuse block
2. Key switch relay
3. Ignition relay
4. Start relay
1
2
4
3
8892a
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