Carrier X4 7300 Operation & Service Manual page 266

Indication/Trouble
9.1.2 Engine Starts Then Stops
Engine stops after several rota-
tions
9.1.3 Engine Will Not Shut Off
Engine will not shut off
9.1.4 Starter Motor Malfunction
Starter motor will not crank or
turns slowly
Starter motor turns but pinion
does not engage
Starter motor does not disengage
after engine starts
9.1.5 Malfunction in the Engine Starting Circuit
No power to starter solenoid (SS)
62-11637
Possible Causes
Fuel supply restricted
No fuel in tank
Leak in fuel system
Faulty fuel control operation
Plugged fuel filter
Plugged inlet screen to mechanical pump
Plugged inlet screen to electric pump
Injector nozzle(s) defective
Injection pump defective
Air cleaner or hose restricted
ENCU defective
Electric fuel pump malfunction
Mechanical fuel pump malfunction
Oil pressure switch defective
ENCU operation defective
Battery insufficiently charged
Battery cable connections loose or corroded
Battery cables defective
Excessively worn, open or defective starter brushes
Starter motor solenoid defective
Incorrect grade of lubricating oil
Pinion or ring gear obstructed or worn
Starter motor solenoid defective
Defective starter
Battery condition
Damaged or corroded electrical connections at starter
ENCU defective
No power from 3MM-12 to Starter Solenoid connector
9–2
Action / Reference
Check
Check
Check
Engine Manual
8.5.5
8.5.3
8.5.4
Engine Manual
Engine Manual
8.5.10
Replace
8.5.4
Engine Manual
Replace
Replace
9.2
Check
Replace
Engine Manual
Engine Manual
2.7
Clean both,
remove burrs,
or replace
Engine Manual
Engine Manual
Load Test
Check/Repair
Replace
Check/Repair