JAC J2, Руководство по обслуживанию

Страница: 215 / 243

Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
214
S/N Step Check result Subsequent step
1
Connect the diagnosis device and adapter, and turn the ignition switch
to ON position.
Next step
Yes Next step
2
Start the engine and run the engine idly till the coolant temperature
reaches to the normal value.
Under all the work conditions, observe the change of the value of
“Oxygen sensor voltage” on the diagnosis meter, and at this moment,
check if the displayed value remains at 900mV or so for a long time
under a certain condition.
No Diagnosis help
Yes Next step
3
Connect the fuel pressure meter to the fuel system inlet pipe, and
observe if the fuel pressure remains at 350kPa or so under all the
work conditions.
No
Check and repair
the fuel system
Yes
Repair or replace
the harness
4
Check if the circuits connecting Pins 39# and 45# of ECU
respectively to Pin 3# (relative to gray connecting wire of oxygen
sensor) and Pin 4# (relative to black connecting wire of oxygen
sensor) of sensor connector are short to power source.
No Next step
Yes
Make check and
repair according
to diagnosis
results.
5
A. Check if the fuel injector drips fuel.
B. Check if the exhaust pipe has leakage.
C. Check if the ignition timing is incorrect.
Etc.
No Diagnosis help
Fault code: P0201 “the control circuit of fuel injector of Cylinder 1# is open”
S/N Step Check result Subsequent step
1
Connect the diagnosis device and adapter, and turn the ignition switch
to ON position.
Next step
Yes To Step 4
2
Unplug the connector of the fuel injector of Cylinder 1# on the
harness, and check if the voltage between Pin 1# of this connector
and the negative pole of power source is about 12V by the
multimeter.
No Next step
Yes
Repair or replace
the harness
3
Check if the circuit between Pin 1# of the fuel injector connector of
Cylinder 1# and the main relay is open or short to ground.
No Next step
Yes Next step
4
Check if the resistance between Pins 1# and 2# of the fuel injector of
Cylinder 1# at 20
is between 11 Ω and 13 Ω by the multimeter.
℃
No
Replace the fuel
injector
Yes Diagnosis help
5
Check if the voltage between Pin 2# of the fuel injector of Cylinder
1# and the negative pole of power source is about 3.7V by the
multimeter.
No Next step
Yes
Repair or replace
the harness
6
Check if the circuit between Pin 2# of the fuel injector connector of
Cylinder 1# and Pin 50 of ECU is open or short to power source or
ground.
No Diagnosis help