General - Buell 2008 XB SERIES Electrical Diagnostics Manual

DTC P0122 (11), P0123 (11)

GENERAL

Throttle Position Sensor (TPS)
See Figure 2-49. The TPS is supplied 5.0 volts from the ECM
(5v REF) and sends a signal back to the ECM (TPS) which
varies according to throttle position. The output signal from the
TPS varies from:
Approximately 0.33 volts at idle (closed throttle).
Approximately 3.86 volts at wide open throttle.
A Code 11 will set if the TPS signal voltage does not fall within
the acceptable range.
If the TPS is removed and/or replaced, the TPS zero set pro-
cedure must be performed. For replacement of TPS, refer to
THROTTLE POSITION SENSOR in the Service Manual.
Table 2-33. Code Description
DTC CHECK
ENGINE
LAMP CODE
P0122 11
P0123 11
ed01298
Figure 2-49. TPS Assembly
2-62 2008 Buell XB Diagnostics: Engine Management
NOTE
DESCRIPTION
Throttle position sensor circuit
low
Throttle position sensor circuit
high
ed01299
Figure 2-50. TPS Terminals [88A]
DIAGNOSTICS
PART NUMBER
B-48115 BREAKOUT BOX
HD-41404-B HARNESS CONNECTOR TEST KIT
Diagnostic Tips
An intermittent may be caused by a poor connection, rubbed
through wire insulation or a wire broken inside the insulation.
Check for the following conditions:
Poor Connection: Inspect ECM harness connector for
backed out terminals, improper mating, broken locks
improperly formed or damaged terminals, poor terminal-
to-wire connection and damaged harness.
Perform 2.6 BREAKOUT BOX
connections and harness check out OK, monitor TPS
voltage using DVOM while moving related connectors ad
wiring harness. If the failure is induced, the DVOM display
will change.
TPS scaling: Observe the TPS voltage display while
operating the throttle with engine stopped and ignition
switch ON. Display should vary from closed throttle TPS
voltage (when throttle is closed) to greater than 4.0 volts
(when throttle is held wide open). As the throttle is slowly
moved, the voltage should change gradually without spikes
or low voltage being observed.
Diagnostic Notes
Each reference number below correlates to a circled number
on the flow chart(s).
2.19
TOOL NAME
to locate intermittents. If