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
TIM-ID: 0000002547 - 001
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