Stihl FS 240 Service Manual page 62

Check leads between control unit
and diagnostic jack
– Connect the test lead, b 7.3.2
1 2
: Measure the resistance between
red lead (1) and black plug (2) of
the diagnostic cable
Target value: < 10 ohms.
1 2
: Measure the resistance between
black lead (1) and red plug (2) of
the diagnostic cable
Target value: < 10 ohms.
If the target values are not
attained
– Check that screw on control unit
(ignition module) and screw on
angled terminal socket are firmly
seated, if necessary, remove
screws and clean with angled
terminal socket, then reinsert and
tighten
FS 240 C, FS 260 C, FS 360 C, FS 410 C, FS 460 C-M
– Check continuity between blade
receptacle and angled terminal
socket
– Blade receptacle and angled
terminal socket must be firmly
connected with one another; in
the event of contact problems,
the M-Tronic wiring harness must
be replaced, b 7.4.
Check leads between solenoid
valve and diagnostic jack
– Connect the test lead, b 7.3.2
1
: Disconnect the plug (1) from the
solenoid valve (2)
1
2
: Measure the resistance between
red lead (1) at the plug of the
solenoid and black plug (2) of the
diagnostic cable
Target value: < 10 ohms
1
: Measure the resistance between
black lead (1) at the plug of the
solenoid and red plug (2) of the
diagnostic cable
Target value: < 10 ohms
If the target values are not
attained
– Check contact surfaces between
2
lug and screw and check leads
for interruptions, e. g., cable
breakage – the leads must be
firmly seated in the blade
receptacle and in the lug.
2
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