Test Connections And Test Values - Stihl MS 240 Instruction Manual

15.7.2 Test Connections and Test Values

– The pin and socket connections
of the wires in the rear handle
must be disconnected to test the
individual components.
Component
Switch
Heating element in
rear handle
Heating element in
handlebar
1)
Pull out wire for this purpose
112
Ohmmeter connection
(use either test lead)
Lead 1 Lead 2
Switch Switch
1)
terminal housing
Connector Connector
on wire on wire
from from
heating heating
element element
Connector Connector
on wire on wire
from from
handlebar handlebar
heating heating
element element
Resistance Ω If faulty
Spec. Actual Cause
< 0.5 - Switch faulty
1.6 1.5 - 2.0 Heating element
OK
- Break in wire,
heating element
damaged
0 Short circuit –
damaged insulation
6.4 6.0...8.0 Heating element
OK
- Break in wire,
heating element
damaged
0 Short circuit –
damaged insulation
Remedy
Replace switch
Install new
heating element
or
repair insulation
Install new
handlebar
Repair insulation
MS 240, MS 260, MS 260 C