Operating instructions

6.2 Troubleshooting
Engine does not turn when starter is actuated
Component Probable Cause Task
Battery Low or defective Charge or replace (see manufacturer's
documentation).
Cable connections defective Check if cable connections are proper‐
ly secured (see manufacturer's docu‐
mentation).
Starter Engine wiring or starter defective Check if cable connections are proper‐
ly secured, contact Service.
Engine wiring Defective Check (→ Page 131).
ECU Plug-in connections are loose Check plug-in connections for secure
seating.
Engine Running gear blocked (engine cannot
be barred manually)
Contact Service.
Engine turns but does not fire
Component Probable Cause Task
Starter Poor rotation by starter: Battery low or
defective
Charge or replace battery (see manu‐
facturer's documentation).
Engine wiring Defective Check (→ Page 131).
Fuel system Not vented Vent fuel system (→ Page 88).
ECU Defective Contact Service.
Engine fires unevenly
Component Probable Cause Task
Fuel injection equip‐
ment
Injector defective Replace (→ Page 85).
Engine wiring Defective Check (→ Page 131).
Fuel system Not vented Vent fuel system (→ Page 88).
ECU Defective Contact Service.
Engine does not reach nominal speed
Component Probable Cause Task
Fuel supply Fuel prefilter clogged Replace (→ Page 95).
Fuel filter clogged Replace (→ Page 89).
Air supply Air filter clogged Check signal ring position of service in‐
dicator (→ Page 100).
Fuel injection equip‐
ment
Injector defective Replace (→ Page 85).
Engine wiring Defective Check (→ Page 131).
Engine Overloaded Contact Service.
62 | Troubleshooting | M015650/04E 2012-02
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