4. Difficult cold start
Common trouble location:
1. Fuel with water; 2. Fuel pump; 3. Coolant temperature sensor; 4. Fuel injector;
5. Ignition coil; 6. Throttle body and idle speed by-pass air way;
7. Mechanical part of the engine.
Diagnosis Flow
Table 1-70
S/N Operation Test Results Actions
Yes Next step
1
Connect the fuel pressure gauge (the connection point
is the front end of the intake pipe of the fuel distribution
pipe assembly), and start the engine. Check if the fuel
pressure of the engine under full working condition is
about 380kPa.
No
Check and repair fuel supply
system
Yes Next step
2
Draw out the wire of one of the cylinders, and connect
with the spark plug. Keep the electrode of the spark plug
about 5mm from the engine body. Start the engine, and
and check if the blue white high voltage fire is produced.
No
Check and repair ignition
system
Yes Replace sensor
3
Disconnect the coolant temperature sensor, and start
the engine. Is it OK? Connect a 2500Ω resistance in
series at the connection point of the coolant temperature
sensor to replace the sensor, and start the engine. Is it
OK?
No Next step
Yes
Wash throttle and idle speed
air way
4
Gently step on the accelerator. Does it can be started
easily?
No Next step
Yes Remove the trouble
5
Remove the fuel injector. Check the fuel injector for
leakage or blockage with a special fuel injector cleaner
& analyzer.
No Next step
Yes Replace fuel
6 Check the fuel for normal operation.
No Next step
Yes
Remove the mechanical
troubles for the engine
7
Check the pressure of each cylinder of the engine.
Check if the pressure is enough.
No Next step
Yes Diagnosis help
8
Connect the electronic injection system adapter. Turn on
the ignition switch. Check the power supply of the pin
12#, 13#, 44#, 45#, 63#. Check the grounding of the pin
3#, 51#, 53#, 61#, 80#. Are they OK?
No
Check and repair relevant
line
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