Buell 2002 S3T, Service Manual

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4-44 2002 Buell S3T: Fuel System
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TROUBLE CODE 11 4.17
GENERAL
Throttle Position Sensor
See Figure 4-39. The throttle position sensor (TP sensor) is
supplied 5.0 volts from the ECM (5v REF) and sends a signal
back to the ECM (TP sensor signal) which varies according to
throttle position. The output signal from the TP sensor varies
from:
●
0.5-1.5 volts at idle (closed throttle).
●
3.9-4.9 volts at wide open throttle.
A Code 11 will set if the TP sensor signal voltage does not fall
within the acceptable range.
NOTE
If the TP sensor is removed and/or replaced, the sensor must
be calibrated using a Scanalyzer. See
4.35 THROTTLE
POSITION SENSOR .
DIAGNOSTICS
Diagnostic Tips
The Scanalyzer reads throttle position in degrees. TP sensor
voltage should increase at a steady rate as throttle is moved
from idle to wide open throttle. An open or short to ground in
R/W or BK/W wires will also result in a Code 11.
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 4.8 WIGGLE TEST to locate intermittents. If
connections and harness check out OK, monitor TP sen-
sor voltage using a Scanalyzer or DVOM while moving
related connectors and wiring harness. If the failure is
induced, the TP sensor display will change.
●
TP sensor scaling. Observe the TP sensor voltage dis-
play while opening the throttle with engine stopped and
ignition switch ON. Display should vary from closed
throttle TP sensor 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 voltages being
observed.
Scanalyzer Notes
The Scanalyzer icon appears at those points in the flow chart
where the Scanalyzer can be used.
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the Code 11 flow charts.
1. Connect BREAKOUT BOX (Part No. HD-42682) to ECM.
See
4.7 BREAKOUT BOX .
2. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404), black socket probe and patch cord.
Figure 4-39. TP Sensor Assembly
Figure 4-40. TP Sensor Terminals [88A]
2
6764
1
3
1. Sensor and Harness
2. Screws (2) (metric)
3. Throttle Shaft
b0651x4x
A (R/W Wire)
B (V/Y Wire)
C (BK/W Wire)
4