Kohler Aegis ELH775 Service Manual page 35

Replace magnet assembly
A Magnet Assembly
Magnet assembly is captured in a small plastic housing
that is press fi t to end of throttle shaft. This generally
does not need replacement. If replacement is required,
can be replaced as follows:
1. Remove sensor from throttle body, exposing round
magnet assembly.
2. A pair of fl at blade screw drivers or a spanner tool
can be used to pry this off shaft. Caution should be
used to avoid damage to machined fl at surface that
sensor seals against. Also, make sure throttle blade
is in full open position to avoid driving throttle blade
into throttle bore causing damage to blade and/or
bore.
3. When replacing magnet assembly, alignment is
critical. There is a D-shaped drive feature on end of
shaft and a matching pocket in magnet assembly.
On outer diameter of magnet assembly is a notch
that aligns with center of fl at feature of D. Align this
notch and fl at of D feature in shaft and preassemble
parts.
4. With throttle blade in full open position (WOT), press
magnet assembly fully on to throttle shaft. Full
insertion can be checked by measuring height from
throttle body sensor mounting face to end of magnet
assembly. This should be no more than 8.6 mm
(0.338 in.). Installation process requires signifi cant
force, so take care that all parts are aligned. Tapping
magnet assembly on can fracture/damage brittle
magnet within assembly and throttle body assembly
and is NOT RECOMMENDED.
66 690 14 Rev. A
B
A
Magnet Installation
B
Depth
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Coolant Temperature Sensor
A sealed, non-serviceable assembly. A faulty sensor
must be replaced. If a blink code indicates a problem
with coolant temperature sensor, it can be tested as
follows:
1. Ensure engine is cool. When radiator is cool to
touch, slowly loosen radiator cap to fi rst stop and
allow any pressure to bleed off . Then loosen it fully
and remove it.
2. Remove coolant temperature sensor from intake
manifold and cap or block hole.
3. Wipe sensor clean and allow it to reach room
temperature (25°C, 77°F).
4. Unplug Black connector from ECU.
5. With sensor still connected, check coolant
temperature sensor circuit resistance between Black
pin 10 and 14 terminals. Value should be 9000-
11000 Ω.
6. Unplug sensor from wire harness and check sensor
resistance separately across two pins. Resistance
value should again be 9000-11000 Ω.
a. If resistance is out of specifi cations, replace
temperature sensor.
b. If it is within specifi cations, proceed to Step 7.
7. Check circuits (input, ground), from wire harness
connector to sensor plug for continuity, damage, etc.
Connect one ohmmeter lead to Black pin 14 in wire
harness connector (as in step 4). Connect other lead
to terminal #1 in sensor plug. Continuity should be
indicated. Repeat test between Black pin 10 and
terminal #2 in sensor plug.
EFI System
35