5 Troubleshooting
5.1 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 (electric)
Engine wiring or starter defective
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
Defective
Check (→ Page 172).
LOP
Secure seating of assemblies or con‐
nectors not provided
Perform visual inspection
(→ Page 181).
ECU
Plug-in connections are loose
Check plug-in connections
(→ Page 176).
Engine
Running gear blocked (engine cannot
be barred manually)
Contact Service.
Start-interlock limit
switch
Limit switch not installed
Check limit switch (→ Page 175).
Limit switch defective
Wiring defective
Check wiring (→ Page 172).
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 172).
Fuel system
Not vented
Vent fuel system (→ Page 131).
ECU
Defective
Contact Service.
Engine fires unevenly
Component
Probable Cause
Task
Fuel injection equip‐
ment
Injector defective
Replace (→ Page 123).
Injection pump defective
Replace (→ Page 120).
Engine wiring
Defective
Check (→ Page 172).
Fuel system
Not vented
Vent fuel system (→ Page 131).
ECU
Defective
Contact Service.
96 | Troubleshooting | MS150031/03E 2011-10
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