Throttle Position Sensor - Buell 2002 P3 Service Manual

HOME
THROTTLE POSITION SENSOR (TP SENSOR)
GENERAL
See Figure 7-10. The throttle position sensor voltage deter-
mines which spark advance curve the ignition module
selects. The throttle position sensor (TP Sensor) is located on
the carburetor. The TP Sensor is not repairable. Replace the
unit if it fails.
See

4.6 THROTTLE POSITION SENSOR

replacing the throttle position sensor.
See diagnostic chart on previous page for troubleshooting
information.
CALIBRATION/TESTING
NOTE
To gain access to the Throttle Position Sensor, remove the
carburetor and air cleaner as an assembly. See
RETOR and 4.3 AIR CLEANER.
1. Adjust throttle position sensor as follows:
a. Back off idle adjustment screw so throttle plate is
fully closed.
b. Completely open and close the throttle by rotating
the throttle control through its full range of motion.
c. Using special TORX bit (Snap-on® TTXR20E),
loosen the two tamper-resistant T20 TORX screws
just enough to allow sensor to rotate.
d. Disconnect pin 3 in connector [88B] (main wire har-
ness).
e. Install Breakout Box Adaptors (HD-42962) and
Breakout Box (HD-42682) using black connectors
between connector halves [88A] and [88B].
f. Turn ignition switch to ON. Using a multimeter, mea-
sure voltage between pin 3 (V/W) and pin 5 (BK).
g. Adjust (rotate) throttle position sensor (TPS) until
voltage reading is 0.5V +/- 0.05V.
h. Completely open and close the throttle by rotating
the throttle control through its full range of motion.
Wide Open Throttle (WOT) should not exceed 3.7V
and reading should increase consistently as throttle
is opened. If the voltage reading is erratic or the volt-
age reading at WOT exceeds 3.7V see
for diagnostic testing.
NOTE
After WOT, the TPS reading may not return back to exactly
0.5V +/- 0.05V. To re-check exact TPS voltage reading, turn
cycle key off and on.
i. Tighten TP Sensor mounting screws to 13-23 in-lbs
(2-3 Nm).
7-12 2002 Buell P3: Electrical
2. Install carburetor and air cleaner. See
and
3. Adjust idle speed. See
IDLE SPEED
a0225x7x
for information on
Tamper-Resistant
T20 TORX Screws
13-23 in-lbs
(1.5-2.6 Nm)
4.4 CARBU-
a0223x7x
AUTO-ENRICHENER/TP SENSOR CONNECTOR [88]
CHAMBER
NUMBER
Figure 7-10.
4.3 AIR CLEANER.
1.19 IGNITION TIMING AND
ADJUSTMENT.
Connector [88]
[10]
1
2
3
WIRE COLOR
1 Violet/Orange Auto-Enrichener
2 Orange Auto-Enrichener
3 Light Blue TP Sensor Output
Figure 7-10. Throttle Position Sensor
7.4
4.3 AIR CLEANER
Throttle Position
Sensor
6
5
4
FUNCTION