6.2 Troubleshooting
Engine does not turn when starter is actuated
Component
Cause
Action
Battery
Low or faulty
Charge or replace (see manufacturer's
documentation).
Cable connections faulty
Check if cable connections are proper‐
ly secured (see manufacturer's docu‐
mentation).
Starter
Engine wiring or starter faulty
Check if cable connections are proper‐
ly secured, contact Service.
Engine cabling
Faulty
Check (→ Page 133).
ECU
Plug-in connections possibly loose
Check plug connections for secure
seating.
Engine
Running gear blocked (engine cannot
be barred manually)
Contact Service.
Engine turns but does not fire
Component
Cause
Action
Starter
Poor rotation by starter:Battery low or
faulty
Charge or replace battery (see manu‐
facturer's documentation).
Engine cabling
Faulty
Check (→ Page 133).
Fuel system
Air in fuel system
Vent fuel system (→ Page 91)
ECU
Faulty
Contact Service.
Engine fires unevenly
Component
Cause
Action
Fuel injection equip‐
ment
Injector faulty
Replace (→ Page 88).
Engine cabling
Faulty
Check (→ Page 133).
Fuel system
Air in fuel system
Vent fuel system (→ Page 91)
ECU
Faulty
Contact Service.
Engine does not reach rated speed
Component
Cause
Action
Fuel supply
Fuel prefilter clogged
Replace (→ Page 98).
Fuel filter clogged
Replace (→ Page 92).
Air supply
Air filter clogged
Check signal ring position of service in‐
dicator (→ Page 103).
Fuel injection equip‐
ment
Injector faulty
Replace (→ Page 88).
Engine cabling
Faulty
Check (→ Page 133).
Engine
Overloaded
Contact Service.
MS150061/04E 2012-07 | Troubleshooting | 65
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