Maintenance Manual for J2 Sedan
Electronic Control System
234
Trouble phenomenon 8: Normal start-up but unstable idle speed
General trouble position:
erature
bypass air passage; 5.Intake passage; 6.Idle adjustor; 7.Mechanical part of engine.
General diagnosis procedure:
Yes
the intake
Check air filter for blockage and air intake passage for
Yes Next step
2
Check spark plug of each cylinder to observe whether
its model and gap are in compliance wit
ce
Yes
Dismantle the idle adjustor to check whether
carbon deposit in the air throttle body, idle adjustor and
Yes
Repair circuit or replace
4
Pull out the connector of
coolant temperature sensor
and start the engine to observe whether the
engine is unstable during warm-up process.
Yes
of
Dismantle the fuel injector and check whether
leakage, blockage or too poor flow in the fuel injector
.
Yes
fuel
6
Check fuel condition and observe w
phenomenon occurs just after adding the fuel.
Yes
Eliminate mechanical trouble
Check pressure of all the cylinders and observe whether
the pressure difference of each engine cylinders is large.
Turn on the ignition switch and check whether the
power supply and earthing are normal.
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