Buell 2002 X1 Handbook page 293

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ENGINE TEMPERATURE SENSOR
GENERAL
The Engine Temperature Sensor (ET Sensor), located in the
rear cylinder head, monitors the engine temperature close to
the combustion chamber. In addition to aiding the ECM in
monitoring the operation of the engine, it is also used to warn
the operator of potentially damaging temperatures by causing
the CHECK ENGINE lamp to blink during operation.
REMOVAL
CAUTION
Do not pull on engine temperature sensor wiring. Excess
strain to sensor wiring will cause sensor damage.
1. Remove fuel tank. See
2. Unplug 1-place connector [90] above rear cylinder head.
3. See Figure 4-81. Remove rubber boot and sensor from
rear cylinder head.
INSTALLATION
CAUTION
Do not pull on engine temperature sensor wiring. Excess
strain to sensor wiring will cause sensor damage.
1. See Figure 4-81. Screw sensor into rear cylinder head
with special ET sensor socket. Make sure wire is in cut-
out portion (slot) of socket to prevent damage. Tighten
ET sensor to 10-14 ft-lbs (14-19 Nm).
2. Install rubber boot to ET Sensor wire (push wire through
hole in boot) with smaller OD side towards sensor.
3. Push rubber boot down sensor wire towards cylinder
head until it seats in hole on top of ET sensor. NOTE:
Orient the rubber boot so the flat on the boot is towards
the left side of the motorcycle.
4. Route ET sensor wire lead through opening at rear of
cylinder head, under rocker box and cover and connect
ET sensor 1-place connector [90] to wiring harness.
2002 Buell X1: Fuel System
4.37 FUEL TANK.
b0801x4x
Engine Temperature
Sensor Location
(Rear Cylinder)
Figure 4-80. Engine Temperature Sensor Location
b0817x3x
ET Wire
Lead
Slot
Figure 4-81. Engine Temperature Sensor Installation
4.33
ET Sensor
Socket
4-97