JAC J2 User Manual



Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
221
Fault code: P0501 “the vehicle speed signal is unreasonable”
S/N
Step
Check
result
Subsequent
step
1
Connect the diagnosis device and adapter, and turn the ignition switch
to OFF position.
Next step
Yes
Check and repair
ABS system
2
For the car with ABS system, please check if the ABS system has any
fault code.
No
Next step
Y
es
Next
step
3
Check
if
the
finger
of
speedometer
operates
normally
.
No
Check and repair
the instrument
circuit
Y
es
Next
step
4
Check
if
the
vehicle
speed
sensor
operates
normally
.
No
Replace the
vehicle speed
sensor
Yes
Repair or replace
the harness
4
Check if the circuit connecting to vehicle speed sensor signal wire to
Pin 57# of ECU is open or short to power source or ground.
No
Diagnosis help
Fault code: P0506 “the idle speed is the lower than the target idle speed”
S/N
Step
Check
result
Subsequent
step
1
Connect the diagnosis device and adapter, and turn the ignition switch
to OFF position.
Next step
Y
es
Next
step
2
Check
if
the
adjusting
screw,
cable
and
condition
of
throttle
are
good.
No
Do the necessary
repair and
maintenance
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 pressure of fuel supply system is
too low.
B. Check if the fuel
injector is blocked.
C. Check if the system exhaust line is blocked.
No
Diagnosis help
Fault code: P0507 “the idle speed is the higher than the target idle speed”
S/N
Step
Check
result
Subsequent
step
1
Connect the diagnosis device and adapter, and turn the ignition switch
to OFF position.
Next step
Y
es
Next
step
2
Check
if
the
adjusting
screw, cable
and
condition of
throttle
are
good.
No
Do the necessary
repair and
maintenance

JAC J2 Specifications

General

Brand	JAC
Model	J2
Category	Automobile
Language	English