Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
239
Trouble phenomenon 13: Powerlessness and poor performance during acceleration
General trouble position:
1.
Poor quality of fuel; 2.Intake pressure sensor and air throttle position sensor; 3.Spark plug;
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:
No.
Operating Steps
Detection Results
Subsequent Steps
Yes
Repair
1
Check whether there are such troubles as the clutch slipping,
low tire pressure, braking drag, wrong size of tire and
incorrect alignment of four wheels etc.
No
Next step
Yes
Repair air intake system
2
Check air filter for blockage.
No
Next step
Yes
Next step
3
Connect the fuel pressure gauge (the access point is at the
front end of the induction manifold of the fuel distribution
pipe assembly) to the engine and start the engine to check
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.
No
Repair fuel supply system
Yes
Next step
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 high-voltage spark.
No
Repair ignition system
Yes
Next step
5
Check the spark plug of each cylinder to observe whether its
model and gap is in compliance with the specification.
No
Adjust or replace
Yes
Wash the related
components
6
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
Next step
7
Check whether the intake pressure sensor, air throttle position
sensor and its line are normal.
No
Repair circuit or replace
sensor
Yes
Failure of replacement
8
Dismantle the fuel injector and check whether there is leakage
or blockage in the fuel injector with cleaning analyzer special
for fuel injector.
No
Next step
Yes
Change fuel
9
Check fuel condition and observe whether the trouble
phenomenon occurs just after adding the fuel.
No
Next step
Yes
Next step
10
Check whether the ignition sequence of engine and ignition
timing is in line with the specification.
No
Repair ignition timing
11
Check whether the operation of the exhaust pipe is smooth.
No
Repair or replace exhaust
pipe
Yes
Diagnosis help
12
Turn on the ignition switch and check whether the power
supply and earthing are normal.
No
Repair related circuit
