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6 Troubleshooting
6.1 Troubleshooting
Engine does not turn when starter is actuated
Component
Battery
Starter
Engine wiring
LOP
ECU
Engine
Start-interlock limit
switch
Engine turns but does not fire
Component
Starter
Engine wiring
Fuel system
ECU
Engine fires unevenly
Component
Fuel injection equip‐
ment
Engine wiring
Fuel system
ECU
Probable Cause
Low or defective
Cable connections defective
Engine wiring or starter defective
Defective
Secure seating of assemblies or con‐
nectors not provided
Plug-in connections are loose
Running gear blocked (engine cannot
be barred manually)
Limit switch not installed
Limit switch defective
Wiring defective
Probable Cause
Poor rotation by starter: Battery low or
defective
Defective
Not vented
Defective
Probable Cause
Injector defective
Injection pump defective
Defective
Not vented
Defective
Task
Charge or replace (see manufacturer's
documentation).
Check if cable connections are proper‐
ly secured (see manufacturer's docu‐
mentation).
Check if cable connections are proper‐
ly secured, contact Service.
Check (→ Page 145).
Perform visual inspection
(→ Page 154).
Check plug-in connections
(→ Page 149).
Contact Service.
Check limit switch (→ Page 148).
Check wiring (→ Page 145).
Task
Charge or replace battery (see manu‐
facturer's documentation).
Check (→ Page 145).
Vent fuel system (→ Page 102).
Contact Service.
Task
Replace (→ Page 94).
Replace (→ Page 91).
Check (→ Page 145).
Vent fuel system (→ Page 102).
Contact Service.
MW15407/14E 2012-02 | Troubleshooting | 67
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