The engine does not turn

The starter does not turn

Problem in the harness from the battery to the starter

Defective starter switch

Defective starter

Insufficiently charged battery

The starter turns but the flywheel does not turn

Worn ring gear

Starter magnet switch trouble

Engine turns but does not start

Fuel is not reaching the fuel pump.

Lack of or insufficient fuel

Air in the fuel line

Air being drawn in from the fuel pipe

Fuel pipe clogged

Defective fuel heater

Fuel filter clogged

Defective fuel pump relay

Use of low quality fuel

Refer to “Engine Control System”.

Fuel is reaching the fuel pump.

Loose fuel delivery pipe

Defective fuel pump

Defective fuel pump harness

Refer to “Engine Control System”.

Insufficient fuel spray

Air in the fuel line

Fuel pipe clogged

Defective fuel injector

Fuel filter clogged

Refer to “Engine Control System”.

Exhaust gas is black and large in quantity

Fuel injection timing trouble

Refer to “Engine Control System”.

Fuel injection condition trouble

Defective fuel injector

Refer to “Engine Control System”.

Faulty compression

Large valve clearance

Defective valve stem

Defective valve spring

Defective piston ring

Defective cylinder head gasket

Defective cylinder block or piston

Fuel trouble

A large quantity of water is mixed in the fuel

Use of low quality fuel

Intake air trouble

Problem in the intake air duct or hose

Excessively dirty air cleaner element

Exhaust system trouble

Defective catalytic converter and DPF

Defective exhaust pipe

Defective muffler

Engine electronic control system trouble

Refer to “Engine Control System”.

Exhaust gas is white and large in quantity

Fuel injection timing trouble

Refer to “Engine Control System”.

Fuel injection condition trouble

Defective fuel injector

Refer to “Engine Control System”.

Faulty compression

Large valve clearance

Defective valve stem

Defective valve spring

Defective piston ring

Defective cylinder head gasket

Defective cylinder block or piston

Fuel trouble

A large quantity of water is mixed in the fuel

Use of low quality fuel

Engine electronic control system trouble

Refer to “Engine Control System”.

Excessive engine oil consumption

Defective piston ring

Defective valve stem oil seal

Knocking occurs

Fuel injection timing trouble

Refer to “Engine Control System”.

Engine electronic control system trouble

Refer to “Engine Control System”.

Fuel trouble

A large quantity of water is mixed in the fuel

Use of low quality fuel

Intake air trouble

Problem in the intake air duct or hose

Excessively dirty air cleaner element

Defective engine

Defective piston, cylinder, connecting rods or seizure

Engine rotation trouble

Engine RPM does not rise

Refer to “Engine Control System”.

Engine RPM is unstable

Refer to “Engine Control System”.

Defective fuel pump

Defective fuel injector

A large quantity of water is mixed in the fuel

Air in the fuel line