JAC J2 - Page 223



Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
222
Y
es
Next
step
3
Check
if
the
working
condition of
idle
regulator
is
good.
No
Do the necessary
repair and
maintenance
Yes
Do the necessary
check and repair
4
A. Check if the system leaks
air
B. Check if the fuel
injector drips fuel.
C. Check if the pressure of fuel supply system is too high.
No
Diagnosis help
Fault code: P0508 “the drive pin of stepping motor is short
to ground”
S/N
Step
Check
result
Subsequent
step
1
Connect the diagnosis device and adapter, and turn the ignition switch
to ON position.
Next step
Y
es
Next
step
2
Unplug the idle regulator connector, and check if the resistances
betwe
en Pin
s A
and D
and P
ins B
and C
of ste
ppin
g moto
r at 2
0
℃
are 53±5.3Ω.
No
Replace the
stepping motor
Yes
Repair or replace
the harness
3
Check if the circuits connecting Pins A, B, C and D of stepping motor
connector respectively to Pins 22#, 21#, 35# and 36# of ECU are
short to ground.
No
Diagnosis help
Fault code: P0509 “the drive pin of stepping motor is short
to power source”
S/N
Step
Check
result
Subsequent
step
1
Connect the diagnosis device and adapter, and turn the ignition switch
to ON position.
Next step
Y
es
Next
step
2
Unplug the idle regulator connector, and check if the resistances
betwe
en Pin
s A
and D
and P
ins B
and C
of ste
ppin
g moto
r at 2
0
℃
are 53±5.3Ω by the multimeter.
No
Replace the
stepping motor
Yes
Repair or replace
the harness
3
Check if the circuits connecting Pins A, B, C and D of stepping motor
connector respectively to Pins 22#, 21#, 35# and 36# of ECU are
short to power source.
No
Diagnosis help
Fault code: P0511 “the drive pin of stepping motor is in open circuit”
S/N
Step
Check
result
Subsequent
step
1
Connect the diagnosis device and adapter, and turn the ignition switch
to ON position.
Next step
Y
es
Next
step
2
Unplug the stepping motor connector, and check if the resistances
betwe
en Pin
s A an
d D an
d Pin
s B an
d C of
idle
regul
ator
at 20
are
℃
53±5.3Ω by the multimeter.
No
Replace the
stepping motor
Yes
Repair or replace
the harness
3
Check if the circuits connecting Pins A, B, C and D of stepping motor
connector respectively to Pins 22#, 21#, 35# and 36# of ECU are
open.
No
Diagnosis help