Stihl MS 461 - Handle Heating System; Troubleshooting; Heater Switch

96 MS 461, MS 461-R
13.3 Handle Heating System
13.3.1 Troubleshooting
The entire handle heating system is
maintenance-free and subject to
practically no wear. Faults in the
generator, heating elements and
wiring are generally caused by
mechanical damage.
There are two reasons for failures in
the heating system:
1. A break in the circuit due to
a faulty wire or component.
2. A short circuit resulting from
damage to the insulation.
– Remove the handle molding,
b 10.2
– Remove the filter base, b 12.3
: Push insulating tube (1) of thick
black wire in direction of
handlebar heating element and
separate the pin and socket
connector.
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: Set the heater switch (1) to "F".
– Set the ohmmeter to "Ω".
– Set the Master Control lever to
"
0".
: Clip the test leads to the wire
from the wiring harness and the
rear handle heating element wire.
Carburetor Heating
– Separate the pin and socket
connector to the thermostatic
switch, b 13.1.2
All electrical components of the
handle heating system are
connected in series with the
ohmmeter.
If the system is in order, the
ohmmeter will indicate a value of
about 10 Ω in measuring range "Ω".
If no reading is obtained, there is a
break in the circuit.
0
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If the ohmmeter shows a very low
value, there is a short circuit in one
of the components.
In either case it is necessary to
check each component separately.
The thermostatic switch wire
remains disconnected during this
check.
– Use handle heating and
generator troubleshooting chart
to check the system, b 13.8.1
– Check resistance on handlebar,
b 13.6
– Check resistance on rear handle,
b 13.5
– After completing the test,
reconnect the wires and push the
insulating tube over the pin and
socket connector.
– Reassemble all other parts in the
reverse sequence.
13.4 Heater Switch
– Remove the carburetor, b 12.4
: Pull wire (1) of heater switch (2)
out of the guides (arrows).
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