INSTALLATION & OPERATION MANUAL
L500 Series
- 62 -
CHAPTER 12
TROUBLESHOOTING GUIDE
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Starter motor does not crank the engine
Possible Causes
•Engine stop switch is not in the “ON” position
(Switch is pressed)
•Engine is not shifted to neutral position
•Weak battery or battery connections are loose
or corroded
•Starter motor solenoid or slave solenoid failure
•Ignition key switch failure
•Defective EOI fuse (3A)
•Wiring or electrical connection fault
•Defective ECU
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Engine cranks but does not start
Possible Causes
•Weak battery or bad starter motor
•Low fuel pressure
•No fuel
•Low compression pressure
•ECU not functioning
•Crank position sensor not functioning
•Incorrect starting procedure
•Fuel is not reaching the engine
•Faulty fuel filter or electric fuel pump
•Bad fuel quality or water in fuel
•Faulty fuse
•Faulty injector
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Engine starts with difficulty or starts and stalls
Possible Causes
•Low fuel pressure in fuel rail
•Faulty alternator or voltage regulator
•Leakage in high pressure fuel circuit
•No engine coolant temperature sensor signal
•Faulty fuse
•Low battery voltage
•No rail pressure sensor signal
•Low compression pressure
•Oil level too high or too low
•Clogged fuel filter
•ECU program error or hardware fault
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Engine idle is rough
Possible Causes
•No rail pressure sensor signal
•Low compression pressure
•Wiring harness open or poor connection
•Faulty high pressure fuel pump
•Bad fuel quality or water in fuel
•Faulty injector
•Clogged fuel filter / air filter
•Carbon deposit on the injector