Operation Manual

155MS 241 C
14.3 Handle heating systems
14.3.1 Troubleshooting
The entire handle heating system is
maintenance-free and not subject to
electrical wear. Faults in the
generator, heating elements and
leads are generally caused by
mechanical damage.
Failures in the heating system may
be due to two reasons:
1. Interruption in the
electrical circuit due to
damage to leads or
components.
2. Short circuit in electrical circuit
due to insulation damage.
– Remove handle molding, b 11.2
: Pull one of the plug connections
out of the guide and slide
insulating tube (1) towards wiring
harness
: Disconnect plug connection (1)
2410RA401 TG
1
2410RA402 TG
1
: Set heating switch (1) to position
"F"
– Set ohmmeter to "Ω" position
– Move the Master Control lever to
position "
0"
: Clip test leads onto the lead from
the wiring harness and the lead
from the heating element
Carburetor heating
– Disconnect plug connection to
thermostatic switch, then reinstall
carburetor, filter base and baffle,
b 13.5
All electrical components of the
handle heating system are
connected in series with the
ohmmeter.
If the system is OK, the ohmmeter
will show a reading of approx. 10 Ω
in the measuring range "Ω".
2410RA382 TG
1
100
50
30
20
10
5
0
2
0
10
5
2
2410RA403 TG
If the pointer does not move, there
is a break in the circuit.
If the ohmmeter shows a very low
value, there is a short circuit in one
of the components.
In both cases, each component
must be checked individually,
In the process, the generator
connector remains disconnected
from the thermostatic switch
connector.
– Test according to the
troubleshooting chart, handle
heating and generator, b 14.7.1
– Measure resistance in front
handle, b 14.6
– Measure resistance in rear
handle, b 14.5
– Press the plug connection
together completely, b 1
– After testing, reconnect the leads
and slide the protective tube back
over the plug connection.
– Reassemble remaining parts in
reverse order