6 Troubleshooting
6.1 Troubleshooting
Engine does not turn when starter is actuated
Component
Cause
Measure
Battery
Discharged 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 cabling or starter faulty
Check if cable connections are proper‐
ly secured, contact Service.
Engine wiring
Faulty
Check (→ Page 188).
LOP
Seating of assemblies or plug connec‐
tors possibly loose
Perform visual inspection
(→ Page 196).
ECU
Seating of plug connections possibly
loose
Check plug connections (→ Page 192).
Engine
Running gear blocked (engine cannot
be barred manually)
Contact Service.
Engine turns but does not fire
Component
Cause
Measure
Starter
Poor rotation by starter: Battery dis‐
charged or faulty
Charge or replace battery (see manu‐
facturer's documentation).
Engine wiring
Faulty
Check (→ Page 188).
Fuel system
Air in fuel system
Vent fuel system (→ Page 136).
ECU
Faulty
Contact Service.
Engine fires unevenly
Component
Cause
Measure
Fuel injection equip‐
ment
Injector faulty
Replace (→ Page 130).
Engine wiring
Faulty
Check (→ Page 188).
Fuel system
Air in fuel system
Vent fuel system (→ Page 136).
ECU
Faulty
Contact Service.
Engine does not reach rated speed
Component
Cause
Measure
Fuel supply
Fuel prefilter clogged
Replace (→ Page 144).
Easy-change fuel filter clogged
Replace (→ Page 138).
Air supply
Air filter clogged
Check signal ring position of contami‐
nation indicator (→ Page 156).
MW15412/05E 2011-11 | Troubleshooting | 109
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