Buell 2008 XB SERIES Electrical Diagnostics Manual page 114

Throttle Position Sensor: DTC P0122 (11); DTC P0123 (11) (Part 1 of 2)
Check engine lamp
continuously ON and
DTC P0122 (11), P0123
(11) only set?
Replace ECM.
To identify source of
intermittents, start at box
marked by Bold Asterisk
on right side of flow
chart. Follow steps while
wiggling harness and
monitoring DVOM.
Install original TPS
and replace ECM. Road
test again to verify.
*
At some point in the flow chart you
may be instructed to jump directly
to a the box with the bold asterisk.
Disregard the asterisk (but not the
instruction box) if your normal
progression through the chart brings
you to this location.
2-64 2008 Buell XB Diagnostics: Engine Management
Attach Electronic Control Module (ECM) to Breakout Box (B-48115). Plug
1
DVOM (Part No. HD-39978) into Pin 4 (+) and Pin 27 (-) of Breakout Box
connector [11] (Gray). With Ignition Switch ON, gradually open throttle while
Does voltage steadily increase with no spikes or low voltages observed from
0.3-1.5 volts at idle (closed throttle) to 3.9-4.9 volts at wide open throttle?
YES
YES NO
Check for intermittents. See
2.7 WIGGLE TEST.
Intermittents present?
YES NO
Replace TPS. (See
THROTTLE POSITION
SENSOR in Buell Service
Manual.) Clear codes
and road test.
Did check engine lamp
come on and set DTC
P0122 (11), P0123 (11)?
YES NO
System
now OK.
observing voltage.
NO
Was voltage greater
*
than 4.9 volts?
YES
Disconnect TPS sensor connector
[88] and ECM connector [11]
(Gray). Measure voltage at Pin 4 (+)
and Pin 19 (-).
Does voltage measure 5.0 volts?
YES
Reconnect TPS connector
[88]. Measure TPS voltage
at wide open throttle.
Is voltage greater than 5.0
volts?
YES
Locate and repair short
between (R/W) wire
and battery voltage.
NOTES:
Clear DTCs and confirm proper operation with no
check engine lamp. Codes can be cleared using
DIGITAL TECHNICIAN (Part No. HD-44750).
After replacing ECM or TPS, TPS zero set procedure
must be performed. Refer to THROTTLE POSITION
SENSOR in the appropriate Buell Service Manual.
NO
STOP
Go to Throttle Position
Sensor Test DTC P0122
(11); P0123 (11) (Part 2 of 2).
NO
Locate and repair
short between (V/Y)
wire and battery
voltage.
NO
Locate and repair
short between (V/Y)
wire and (R/W) wire.
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