JAC J2 User Manual

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
Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
228
Trouble phenomenon 2: Engine start to run but can not be started successfully during the
start-up
General trouble position:
1.
No fuel
in
the
fuel tank;
2. Fuel
injection pump;
3.Cranksha
ft
position sensor;
4.Igniti
on
coil;
5.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 s
tart the engine to determine
whether the readings of fuel pressure gauge when idling is at
about 260kPa; disconnect vacuum hose of pressure regulator
and observe whether fuel
pressure is about 300kPa.
No
Repair the fuel supply
system
Yes Next step
2
Connect the electric control system diagnosis apparatus to the
engine to observe the data of "rotating speed of engine" and
start the engine to observe whether there is
speed signal output.
No
Repair crankshaft
position sensor circuit
Yes
Next
step
3
Pull out the high-voltage wire of
one of the cylinders and
connect the spark plug to make the spark plug
electrodes
around 5mm away from the engine body, and start the engine to
check whether there is blue and
white high-voltage spark.
No
Repaire ignitio
n system
Yes
Eliminate mechanical
trouble of engine
4
Check the pressure of all the cyli
nders and observe whether the
pressure of engine cylinders is insufficient.
No
Next step
Yes
Diagnosis
help
5
Turn on the ignition switch and
check whether the power
supply and earthing are normal.
No
Repair related
circuit

JAC J2 Specifications

General

Brand	JAC
Model	J2
Category	Automobile
Language	English