5 Maintenance
Self-help
Malfunctions, Causes and Remedies (diesel engine)
Engine will not start
Possible cause
Remedy
Fuel tank empty.
Fill up the tank.
Fuel filter clogged, caused in winter by paraffin
segregation.
Change the filter. Use winter fuel.
Water in the fuel filter. Drain water from the fue
lfilter.
Fuel shut-off valve does not open.
Check with test lamp whether power present; if
not, check the fuse and the valve.
Immobiliser active.
Contact your authorised dealer.
Leak in fuel line.
Check all fuel line connectors for leaks and
tighten screw joints.
The display unit does not light up.
Tighten connecting terminals at the battery,
check line connectors.
Preheating system defective.
Check the current entry, lines and connections
on the glow plug starting switch. If the fault
cannot be remedied, please contact your
authorised dealer.
Pump/nozzle unit defective.
Engine idle speed incorrect.
These faults should be checked and remedied
only by a trained technician. Please contact
your authorised dealer.
Indicator light is illuminated: "Electrical controller fault".
Possible cause
Remedy
Fault in the electrical controller
Fault can be determined using the diagnostic
device. Contact your authorised dealer.
Engine st
arting performance is poor
Possibl
ecause
Remedy
Battery power too low Battery terminals loose
or oxidised, causing the starter motor to turn
only slowly.
Have the battery checked, clean the connecting
terminals, tighten them and smear them with
acid-free grease.
Fuel supply insufficient. Blockages or air locks
in the fuel system, caused in winter by paraffin
segregation.
Change fuel filter, check fuel line connectors for
leaks and tighten screw joints. In cold climates,
use winter fuel.
Especially in winter: engine oil used is too
viscous.
Use engine oil appropriate to the outside
temperature.
196 Operating Instructions – 394 807 10 01 EN – 07/2011
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