JAC J2 - Page 220



Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
219
S/N
Step
Check
result
Subsequent
step
valv
e at 20
is be
tween 22Ω
and
30Ω
by th
e multim
eter
.
℃

No
Replace the
control valve
Y
es
Diagnosi
s
help
5
Check if the voltage between Pin 1# of the canister control valve
connector 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 connecting Pin 2# of canister control valve
connector to Pin 37# of ECU is open.
No
Diagnosis help
Fault code: P0458 “the voltage of control circuit of canister control valve is too low”
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 To Step
4
2
Unplug the connector of canister control valve 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 of power supply side of canister control valve is
open or short to ground.
No
T
o Step 2
Y
es
Next
step
4
Check if the resistance between Pins 1# and 2# of the canister control
valv
e at
20
is be
tween
22Ω
and
30Ω
by th
e multim
eter
.
℃

No
Replace the
control valve
Y
es
Diagnosi
s
help
5
Check if the voltage between Pin 1# of the canister control valve
connector 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 connecting Pin 2# of canister control valve
connector to Pin 37# of ECU is short to ground.
No
Diagnosis help
Fault code: P0459 “the voltage of control circuit of canister control valve is too high”
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
To
Step
4
2
Unplug the connector of canister control valve 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 of power supply side of canister control valve is
open or short to ground.
No
T
o Step 2
Y
es
Next
step
4
Check if the resistance between Pins 1# and 2# of the canister control
valv
e at 20
is be
tween 22Ω and 30Ω
by th
e multim
eter
.
℃

No
Replace the
control valve
Y
es
Diagnosi
s
help
5
Check if the voltage between Pin 1# of the canister control valve
connector and the negative pole of power source is about 3.7V by the
multimeter.
No
Next step