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 (electric) Engine wiring or starter faulty Check if cable connections are proper‐
ly secured, contact Service.
Starter (compressed
air)
Starting-air pressure not available Check firm seating of connections,
check starting-air pressure and main
valve of compressed-air system. Con‐
tact Service.
Engine wiring Faulty Check (→ Page 234).
LOP Assemblies or connectors possibly
loose
Perform visual inspection
(→ Page 243).
ECU Plug-in connections possibly loose Check plug-in connections
(→ Page 238).
Engine Running gear blocked (engine cannot
be barred manually)
Contact Service.
Start interlock limit
switch
Limit switch not installed Check limit switch (→ Page 237).
Limit switch defective
Wiring faulty Check wiring (→ Page 234).
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 234).
Fuel system Air in fuel system Vent fuel system (→ Page 193).
ECU Faulty Contact Service.
Engine fires unevenly
Component Cause Measure
Fuel injection equip‐
ment
Injector faulty Replace (→ Page 183).
Injection pump defective Replace (→ Page 180).
Engine wiring Faulty Check (→ Page 234).
Fuel system Air in fuel system Vent fuel system (→ Page 193).
ECU Faulty Contact Service.
MW15550/06E 2012-02 | Troubleshooting | 149
TIM-ID: 0000002547 - 002
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