Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
230
Trouble phenomenon 4: Difficulty in cold start
General trouble position:
1.
Poor quality of fuel; 2. Fuel injection pump; 3.Coolant temperature sensor; 4.Fuel injector;
5.Ignition coil; 6.Air throttle body and idle bypass air passage; 7.Mechanical part of engine
General diagnosis procedure:
No.
Operating Steps
Detection Results
Subsequent Steps
Yes
Next step
1
Connect the fuel pressure gauge (the access point is at the
front end of the induction manifold of the fuel distribution
pipe assembly) to the engine and start the engine to check
whether the reading of fuel pressure gauge at idle condition
is at about 260kPa. Disconnect vacuum hose on pressure
regulator and observe whether fuel pressure is about 300kPa.
No
Repair fuel supply
system
Yes
Next step
2
Pull out the high-voltage wire of one of the cylinders and
connect the spark plug to make the spark plug electrodes
about 5mm away from the engine body, and start the engine
to check whether there is the blue and white high-voltage
spark.
No
Repair the ignition
system
Yes
Repair circuit or
replace the sensor
3
Pull out the connector of coolant temperature sensor and
start the engine to observe whether the engine is successfully
started at this time. (Alternatively, connect a 2500 ohm
resistance in series at the connector of coolant temperature
sensor to observe whether the engine is successfully started
at this time.)
No
Next step
Yes
Wash the air throttle
and idle air passage
4
Gently step down the accelerator pedal to observe whether it
is easy to start.
No
Next step
Yes
Failure of
Replacement
5
Dismantle the fuel injector and check whether there is
leakage or blockage in the fuel injector with the cleaning
analyzer special for fuel injector.
No
Next step
Yes
Change fuel
6
Check the fuel conditions and observe whether the trouble
phenomenon occurs just after adding the fuel.
No
Next step
Yes
Eliminate the
mechanical trouble of
engine
7
Check the pressure states of all the cylinders of engine and
observe whether the pressure of engine cylinder is
insufficient.
No
Next step
Yes
Diagnosis help
8
Turn on the ignition switch and check whether the power
supply and earthing are normal.
No
Repair related circuit
