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Possible causes
Oil viscosity unsuitable
Valve clearance incorrect
Defective cylinder head gasket
Valve and valve seat worn and carbon deposits
Valve spring fatigued
Piston ring worn and damaged
Piston ring groove worn and damaged
Piston and cylinder liner worn
Crankshaft incorrectly sized
Cooling system malfunction
Defective starter switch
Defective glow relay
Engine speed
Defective sensor; Sensor open-circuited, short, or intermit-
sensor; Cylinder
tent connection
recognition
Each sensor improperly mounted
sensor
Defective boost pressure sensor; Boost pressure sensor open-circuited, short
or intermittent connection
Defective coolant temperature sensor; Coolant temperature sensor open-cir-
cuited, short, or intermittent connection
Defective fuel injection volume adjusting resistor; Resistor open-circuited,
short, or intermittent connection
Defective idling speed adjustment knob; Idling speed adjustment knob open-
circuited, short or intermittent connection
Defective electronic control unit main power relay; Relay open-circuited, short
or intermittent connection
Engine
Defective electronic control unit
electronic
Not yet initialized for supply pump unit difference
control unit
Dead battery
Alternator malfunction
Blown fuse
Symptoms
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O O O
O
O
O O
O
O O
O O O
O O O
O O
O O
O O
O O
O O O O O
O
O
O O
O
O
O
O O
13A
Reference
Gr
Gr12
Gr11
O
Gr14
O
O O
O Gr13E
O O
Gr11
O
O
O
Gr13E
O
O
O
O O
O
O O
O
O
O
13A-7
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Table of Contents
Troubleshooting
