Maintenance 5
Troubleshooting
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
wax segregation.
Change the filter. Use winter fuel.
Water in the fuel filter. Drain water from the fuel filter.
Fuel shut-off valve does not open.
Check with test lamp whether power present; if
not, check the fuse and the shut-off valve.
Immobiliser active.
Contact your authorised dealer.
Leak in fuel line.
Check all fuel line connections for leaks and
tighten screw joints.
The indicator unit does not light up.
Tighten connection terminals at the battery,
check wiring connections.
Preheating system defective.
Check power supply, wiring and connections
to the glow plug start switch. If this does
not resolve the defect, please contact your
authorised dealer.
Pump/nozzle unit defective.
Engine idling speed incorrect.
This defect should be checked and remedied
only by a trained technician . Please contact
your authorised dealer.
Indicator light is illuminated: "Defect in electrical control system".
Possible cause
Remedy
Defect in electrical control system
Defect can be determined using the diagnos-
tics tester. Contact your authorised dealer.
Engine starting performance is poor
Possible cause
Remedy
Battery power too low Battery terminals loose
or oxidised, causing the starter motor to turn
only slowly.
Have the battery checked, clean the connec-
tion 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
wax segregation.
Renew fuel filter, check fuel line connections
for leaks and tighten clamping screws. In cold
climates, use winter fuel.
Especially in winter: engine oil used is too
viscous.
Use engine oil appropriate to the external
temperature.
Operating Instructions – 393 807 1001 EN – 08/2008 197
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