Troubleshooting Chart - Stihl MS 440 Service Manual

14.1.1 Troubleshooting Chart

yes
Measure resistance of
individual heating elements
(On machines with carburetor heating,
pull connector pins of wire from heating
element on carburetor out of round plugs)
Check handle heating element
Resistance of rear handle heating element
Resistance between engine ground
and black generator
connection = approx. 0.9 Ω ?
1
MS 440, MS 440 C
Start
Do both handles
warm up?
no
Heater switch
on "#"?
yes
with ohmmeter
In good condition?
Adhesion OK?
yes
about 1 Ω ?
yes
Check generator
yes
2
no
no
Replace
handle heating
element
no
no
Install new
generator
Turn on
switch
3
83