ENGINE
L3301, L3901, L4701, WSM
1-S1
1. TROUBLESHOOTING
Symptom Probable Cause Solution
Reference
Page
Engine Does Not
Start
No fuel Fill fuel G-21, G-50
Air in the fuel system Bleed G-46, G-74
Water in the fuel system Change fuel and
repair or replace fuel
system
–
Fuel pipe clogged Clean –
Fuel filter clogged Replace G-39, G-66
Excessively high viscosity of fuel at low
temperature
Use the specified fuel G-10, G-11
Fuel with low cetane number Use the specified fuel G-10, G-11
Fuel leak due to loose injection pipe retaining nut Tighten nut 1-S41
Injector stuck or clogged Replace 1-S44
Fuel supply pump malfunctioning Replace 1-S49
Seizure of crankshaft, camshaft, piston or
bearing
Repair or replace 1-S52,
1-S55,
1-S61
Compression leak from cylinder Replace head gasket,
tighten cylinder head
screw, glow plug and
injector
1-S43,
1-S44,
1-S46
Improper valve timing Correct or replace
timing gear
1-S52,
1-S52
Piston ring and cylinder worn out Replace 1-S56,
1-S79
Incorrect valve clearance Adjust 1-S12
Starter Does Not
Operate
Battery discharged Charge G-33, G-61
Starter malfunctioning Repair or replace 9-S29,
9-S59
Key switch malfunctioning Repair or replace 9-S26
Safety switches improperly adjusted or damaged Adjust or replace 9-S27
Starter relay damaged Replace 9-S30
Wiring disconnected Connect –
Engine Revolution Is
Not Smooth
Fuel filter clogged or dirty Change G-39, G-66
Air cleaner clogged Clean or change G-29, G-58
Fuel leak due to loose injection pipe retaining nut Tighten nut 1-S41
Fuel supply pump malfunctioning Replace 1-S49
Injector stuck or clogged Replace 1-S44
Either White or Blue
Exhaust Gas Is
Observed
Excessive engine oil Reduce to the
specified level
G-36, G-64
Piston ring and cylinder worn or stuck Repair or replace 1-S56,
1-S79
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