JAC J2 User Manual

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Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
224
S/N
Step
Check
result
Subsequent
step
always between 9V and 16V within
different rotation speed ranges.
No
Replace the
generator
Y
es
Diagnosi
s
help
4
Check
if
the
grounding
point
of
engine
harness is
good.
No
Repair or replace
the harness
Fault code: P0602 “the programming of electronic control unit is in trouble”
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
Eliminate
the
fault
code
and
reconfirm
if
this
fault
is
a
steady
fault.
No
The system is
normal.
3
Replace
ECU.
End
Fault code: P0645 “the control circuit of A/C compressor relay is open”
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 To Step
4
2
Unplug the A/C compressor relay, turn the ignition key to “ON”
position, and check if the voltage between the relay power supply
side (namely Pins 87# and 85# of relay) and the negative pole of
power source is about 12V.
No
Next step
Yes
Repair or replace
the harness
3
Check if the circuit of relay power supply side is open or short to
ground.
No
T
o Step 2
Y
es
Replace
the
relay
4
Check if the voltage between the control side of A/C compressor
relay (namely Pin 86# of relay)
and the negative pole of pow
er source
is about 3.7V.
No
Next step
Yes
Repair or replace
the harness
5
Check if the circuit connecting control side of A/C compressor relay
(namely Pin 86# of relay) to Pin 61# of ECU is
open.
No
Diagnosis help
Fault code: P0646 “the control circuit of A/C compressor relay is short to ground”
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
To
Step
4
2
Unplug the A/C compressor relay, turn the ignition key to “ON”
position, and check if the voltage between the relay power supply
side (namely Pins 87# and 85# of relay) and the negative pole of
power source is about 12V.
No
Next step
3
Check if the circuit of relay power supply side is open or short to
ground.
Yes
Repair or replace
the harness

JAC J2 Specifications

General

Brand	JAC
Model	J2
Category	Automobile
Language	English