Operation Manual

75MS 241 C
Check leads between control unit
and diagnostic jack
– Connect the test lead, b 16
: Measure the resistance between
blade receptacle (1) with red lead
and black plug (2) of the
diagnostic cable
Target value: < 10 ohms.
: Measure the resistance between
blade receptacle (1) with black
lead and red plug (2) of the
diagnostic cable
Target value: < 10 ohms.
If the target values are not
attained
– Check contact between blade
receptacle of the switch shaft and
contact spring
2410RA233 TG
1
2
2410RA234 TG
1
2
– Check continuity between leads
and blade receptacles
– Blade receptacles must be
firmly connected to the leads; in
the event of contact problems,
the wiring harness must be
replaced, b 8.2.3, b 8.2.6
Check leads between solenoid
valve and diagnostic jack
– Connect the test lead, b 8.2.2
– Versions with manual fuel pump,
remove fuel pump and set it
aside, b 8.2.3
: Disconnect the plug (1) from the
solenoid valve (2) – the solenoid
valve must not be twisted; if
necessary, hold the solenoid
valve in place when
disconnecting the plug
: Measure the resistance between
red lead (1) at the plug of the
solenoid and black plug (2) of the
diagnostic cable
2
2410RA229 TG
1
2410RA235 TG
1 2
Target value: < 10 ohms
: 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 on plug
of the plug connection, as well as
checking electrical leads for
interruption, e. g., cable
breakage
– If the contact surfaces on the plug
are damaged in the plug
connection between wiring
harness and switchgear, the
wiring harness must be replaced,
b 7.7.2, if the contacts in the
jack are damaged, the
switchgear must be replaced,
b 8.4
– Reassemble remaining parts in
reverse order
2410RA236 TG
1
2