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 122).
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 122).
Fuel system
Not vented
Vent fuel system (→ Page 80).
ECU
Defective
Contact Service.
Engine fires unevenly
Component
Probable Cause
Task
Fuel injection equip‐
ment
Injector defective
Replace (→ Page 77).
Engine wiring
Defective
Check (→ Page 122).
Fuel system
Not vented
Vent fuel system (→ Page 80).
ECU
Defective
Contact Service.
Engine does not reach nominal speed
Component
Probable Cause
Task
Fuel supply
Fuel prefilter clogged
Replace (→ Page 87).
Fuel filter clogged
Replace (→ Page 81).
Air supply
Air filter clogged
Check signal ring position of service in‐
dicator (→ Page 92).
Fuel injection equip‐
ment
Injector defective
Replace (→ Page 77).
Engine wiring
Defective
Check (→ Page 122).
Engine
Overloaded
Contact Service.
54 | Troubleshooting | M015700/06E 2012-06
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