Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
222
Yes
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
Yes
Next step
2
Unplug the idle regulator connector, and check if the resistances
between Pins A and D and Pins B and C of stepping motor at 20
℃
are 53±5.3
Ω
.
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
Yes
Next step
2
Unplug the idle regulator connector, and check if the resistances
between Pins A and D and Pins B and C of stepping motor at 20
℃
are 53±5.3
Ω
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
Yes
Next step
2
Unplug the stepping motor connector, and check if the resistances
between Pins A and D and Pins B and C of idle regulator at 20
are
℃
53±5.3
Ω
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
