Maintenance Manual for J2 Sedan
Electronic Control System
239
Trouble phenomenon 13: Powerlessness and poor performance during acceleration
General trouble position:
1.
of fuel; 2.Intake pressure sensor and air throttle position sensor; 3.Spark
4.Ignition coil; 5. Throttle body and idle bypass air passage; 6.Intake passage; 7.Idle adjustor;
8.Fuel injector; 9.Ignition timing ; 10.Exhaust pipe.
General diagnosis procedure:
1
Check whether there are such
troubles as the clutch slipping,
low tire pressure, braking drag, wrong size of
incorrect alignment of four wheels etc.
Yes
system
Yes Next
Connect the fuel pressure gauge (the access point is
front end of the induction manifold of the f
uel distribution
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 300kPa.
Yes Next
4
Pull out the high-voltage wire
of one of the cylinders and
connect the spark plug to keep the spark plug electrodes about
5mm away from the engine body, and start the engine to
check whether the strength of
step
Check the spark plug of each cylinder to
model and gap is in compliance
Dismantle the idle adjustor to check whether there is carbon
deposit in the air throttle body, idle adjustor and idle bypass
Yes Next
7
Check whether the intake pressure sensor, air
Repair circuit or replace
sensor
Yes Failure of
Dismantle the fuel injector and check w
or blockage in the fuel injector with cleaning anal
Yes
fuel
9
Check fuel condition and observe
whether the trouble
phenomenon occurs just after adding the fuel.
Yes Next
10
Check whether the ignition sequence of engine a
11 Check whether
of
exhaust
is smooth.
Repair or replace exhaust
Yes
12
Turn on the ignition switch a
nd check whether the power
supply and earthing are normal.
ircuit
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