Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
220
S/N
Step
Check result
Subsequent 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 power source.
No
Diagnosis help
Fault code: P0480 “the control circuit of cooling fan relay is open (low 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
Yes
To Step 4
2
Unplug the A/C condenser cooling fan relay, turn the ignition key to
“ON” position, and check if the voltage between the relay power
supply side (namely Pins 30# and 87# 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 power supply side of A/C condenser cooling
fan relay is open or short to ground.
No
To Step 2
Yes
Replace the relay
4
Check if the voltage between the control side of A/C condenser
cooling fan relay (namely Pin 86# of relay) and the negative pole of
power source is about 3.7V by the multimeter.
No
Next step
Yes
Repair or replace
the harness
5
Check if the circuit connecting to Pin 86# of relay control side to Pin
62# of ECU is open or short to power source or ground.
No
Diagnosis help
Fault code: P0481 “the control circuit of cooling fan relay is open (high 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
Yes
To Step 4
2
Unplug the A/C condenser cooling fan relay, turn the ignition key to
“ON” position, and check if the voltage between the relay power
supply side (namely Pins 30# and 87# 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 power supply side of A/C condenser cooling
fan relay is open or short to ground.
No
To Step 2
Yes
Replace the relay
4
Check if the voltage between the control side of A/C condenser
cooling fan relay (namely Pin 86# of relay) and the negative pole of
power source is about 3.7V.
No
Next step
Yes
Repair or replace
the harness
5
Check if the circuit connecting to Pin 86# of relay control side to Pin
52# of ECU is open or short to power source or ground.
No
Diagnosis help
