Maintenance Manual for J2 Sedan
Electronic Control System
237
Trouble phenomenon 11: Engine
speed fails to increase or flameout occurs during
acceleration
General trouble position:
1.
2. Intake
nsor and air throttle posi
sor; 3.Spark plug; 4.
Throttle body and idle bypass air passage; 5.Intake passage; 6.Idle adjustor; 7.Fuel injector;
8.Ignition timing; 9.Exhaust pipe.
General diagnosis procedure:
Yes
intake
1 Check air filter
No
Yes Next
2
Connect the fuel pressure gauge (the access point is
at the
front end of the induction manifold of the f
pipe assembly) to the engine and start
whether the reading of fuel pressure gauge when idling is at
about 260kPa; disconnect vacuum hose from pressure
regulator to see whether fuel pressure is about 200kPa.
No
system
step
Check spark plug of each cylinder to observe whether its
model and gap are in compliance with the
No
ce
Dismantle the idle adjustor to check whether
deposit in the air throttle body, idle adjustor and idle bypass
No
Yes Next
5
Check whether the intake pressure sensor, air
position sensor and their circuits
No
Yes Failure of
Dismantle the fuel injector and check whether
leakage or blockage in the fuel injector with cleaning
analyzer special for fuel injector.
Yes
fuel
7
Check fuel condition and observe w
hether the trouble
phenomenon occurs just after adding the fuel.
No
Yes Next
8
Check whether the ignition sequence of engine a
timing is in compliance with specification.
No
step
9 Check
the
of
exhaust
smooth.
No
Yes
10
Turn on the ignition switch and
supply and earthing are normal.
No
circuit
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