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