Engine Temperature Sensor - Buell 2002 S3T Service Manual

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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
1. Remove fuel tank. See 4.36 FUEL TANK
CAUTION
Do not pull on engine temperature sensor wiring. Excess
strain to sensor wiring will cause sensor damage.
2. See Figure 4-74. Unplug 1-place connector [90] above
rear cylinder head.
3. Slide rubber boot up and remove sensor from rear cylin-
der head using ET Sensor Socket or equivalent.
INSTALLATION
CAUTION
Do not pull on engine temperature sensor wiring. Excess
strain to sensor wiring will cause sensor damage.
1. See Figure 4-75. 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.
5. Install fuel tank. See 4.36 FUEL TANK.
4-92 2002 Buell S3T: Fuel System
b0801x4x
Engine Temperature
Sensor Location
(Rear Cylinder)
Figure 4-74. Engine Temperature Sensor Location
b0817x3x
ET Wire
Lead
Slot
Figure 4-75. Engine Temperature Sensor Installation
4.32
ET Sensor
Socket