1. General Information/Trouble Diagnosis
1-12
Troubles Diagnosis
A. Engine hard to start or can not be started
砂孔
Check and adjustment
Fault condition
Probable causes
Loosen carburetor drain bolt to
check if there is gasoline
inside the carburetor
Fuel supplied to fuel
injector sufficient
No fuel is supplied to
fuel injector
Remove spark plug, install
it into spark plug cap, and
perform a spark test
against engine ground.
Perform cylinder
compression pressure
test.
Check if spark.
Weak spark, no spark at
all.
cylinder compression
pressure normal
Low compression
pressure or no pressure.
Re-start by following the
starting procedures.
No ignition
There are some signs of
ignition, nut engine can
not be started.
Remove the spark plug
again and check it.
Dry spark plug
Wet spark plug
1. No fuel in fuel tank
2. Check if the pipes, fuel tank to fuel
injector and intake vacuum, are clogged.
3. Malfunction of fuel pump relay or poor
wire connection
4. Lines in fuel tank evaporation system
clogged
5. Malfunction of fuel pump
6. Fuel filter clogged
1. Malfunction of spark plug
2. Spark plug foul
3. Malfunction of ECU
4. Malfunction of AC generator
5. Ignition coil is in open or short circuit
6. Ignition coil leads open or short circuit
7. Malfunction of main switch
1. Piston ring seized
2. Malfunction of cylinder valves
3. Worn cylinder and piston ring
4. Cylinder gasket leak
5. Leak in compression parts
1. Malfunction of throttle valve operation
2. Air sucked into intake manifold
3. Incorrect ignition timing
1. Dirt or clogged fuel injector
2. Malfunction of throttle valve operation
3. Throttle valve opening too wide
