JAC J2 User Manual

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
Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
235
Trouble phenomenon 9: Normal start-up but unstable idling speed or flameout with partially load
(for example, when the air conditioner is on)
General trouble position:
1.
Air
condition
ing
system;
2.
Idle
adjustor;
3.Fuel
injector
General diagnosis procedure:
No.
Operating Steps
Detection
Results
Subsequent Steps
Yes
Wash related
components
1
Dismantle the idle adjustor to check whether
there is carbon deposit
in the air
throttle body
, idle adjustor and idle
bypass air passage.
No
Next step
Yes
To
step
4
2
Observe whether power output of engine is increased air
conditioner opera
tion, namely, use the electric
control system
diagnosis apparatus to observe the changes
of ignition advance
angle, fuel injector pulse width and intake
volume.
No
Next step
Yes
Next
step
3
Connect the adapter of electric control system and disconnect the
connecting wire of the pin #75 of electronic control module to
check whether there is high level signal at the wire
harness end with
AC turned on.
No
Repair air
conditioning system
Yes
Next
step
4
Inspect pressure of air conditioning system, electromagnetic clutch
of compressor and the compressor pump of
air conditioner
.
No
Repair AC system
Yes
Failure of
replacement
5
Dismantle the fuel injector and check whether
there is leakage,
blockage or too poor flow in the fuel injector with cleaning
analyzer
special for fuel injector.
No
Next step
Yes
Diagnosis
help
6
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