JAC J2 User Manual



Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
236
Trouble phenomenon 10: Normal start-up but too high idling speed
General trouble position:
1.
Throttle body
and
idle
bypass air
passage; 2.Vacuum
pipe;
3.Idle adjustor;
4.Coolant temperature
sensor; 5.Ignition timing
General diagnosis procedure:
No.
Operating Steps
Detection
Results
Subsequent Steps
Yes Adjust
1
Check
throttle
cable
for
catching
or
overtension..
No
Next step
Yes
Repair
intake
system
2
Check
air
intake
system
and
vacuum
pipeline
or
leakage.
No
Next step
Yes
Wash related
components
3
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
Repair circuit or
replace sensor
4
Pull out the connector of coolant temperature sensor and start the
engine to observe whether the idle speed of engine
is too high at
this time.
No
Next step
Yes
Next step
5
Check whether the ignition timing of engine is in compliance with
the specification.
No
Repair ignition
timing
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