Maintenance Manual for J2 Sedan
Electronic Control System
233
Trouble phenomenon 7: Normal start-up but unstable idling during the warming-up
General trouble position:
ture se
air passage; 5.Intake passage; 6.Idle adjustor; 7.Mechanical part of engine.
General diagnosis procedure:
Results
1 Check air filter
and air intake
for
Next
2
Check the spark plug of each cylinder to observe whether its
and gap are in compliance with the
ce
Dismantle the idle adjustor to check whether
in the air throttle body, idle adjustor or idle bypass air passage.
4
Pull out the connector of coolant temperature sensor and start the
engine to observe whether the idle speed of engine
is unstable
Failure of
5
Dismantle the fuel injector and check whether
blockage or too poor flow in the fuel injector with cleaning
special for fuel injector.
fuel
6
Check fuel condition and observe w
hether the trouble phenomenon
occurs just after adding the fuel.
mechanical trouble of
7
Check pressure of all the cylinders and observe whether
pressure difference of each engine cylinders is large.
8
Turn on the ignition switch and check whether the power supply
circuit
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