
38
Troubleshooting
Engine
Fault
Cause
Action
Blown Fuse
Replace
Start switch faulty
Repair or replace
Starting speed too slow
Recharge battery. Check and
replace starter motor
Oil of incorrect viscosity
Change oil to correct grade
Mobile parts seized
Repair
Air in the fuel delivery system
Prime
Fuel tank empty
Fill the tank
Fuel of incorrect quality
Change the fuel
Fuel filter clogged
Change the fuel filter
Fuel injection pump faulty
Repair or replace
Ignition control unit faulty
Replace
Engine will not start
Air filter element clogged
Clean or replace
Oil of incorrect viscosity
Change the oil
Air filter element clogged
Clean or replace
Fuel filter clogged
Clean or replace
Fuel injection pump clogged
Clean or replace
Fuel injectors faulty
Clean or replace
Wrong injection timing
Adjust
Fuel of incorrect quality
Change the fuel
Overheat
Rinse the cooling and replace
parts as needed
Valve clearance incorrect
Adjust
Not enough power
Poor compression (cylinders,
piston rings, etc, worn)
Repair or replace
Not enough coolant
Add coolant
Leaks in the cooling system
Retighten or repair
Loose fan belt
Adjust
Air flow obstructed in the radiator
Remove obstruction / clean
Water pump faulty
Replace
Fan Faulty
Replace
Thermostat faulty
Replace
Overheating
High concentration of LLC
Adjust the LLC concentration
Too much oil in the engine
Adjust oil level to proper level
Oil viscosity too low
Change the oil
Thermostat faulty (coolant
temperature too low)
Replace
Fuel injector faulty
Repair or replace
Wrong injection timing
Adjust
Wrong fuel cetane number
Change the fuel
Too much white or blue smoke
Poor compression (cylinders,
piston rings, etc, worn)
Repair or replace
Fuel of incorrect quality
Change the fuel
Fuel injection pump faulty
Repair or replace
Fuel injectors faulty
Repair or replace
Too much black or gray smoke
Wrong injection timing
Adjust
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