Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
225
S/N
Step
Check result
Subsequent step
No
To Step 2
Yes
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 power source
is about 3.7V by multimeter by the multimeter.
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 short to ground.
No
Next step
Yes
Diagnosis help
6
Check if the electromagnetic clutch of A/C compressor operates
normally.
No
Repair or replace
the
electromagnetic
clutch
Fault code: P0647 “the control circuit of A/C compressor relay 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 OFF position.
Next step
Yes
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
To Step 2
Yes
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 power source
is about 3.7V by multimeter.
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 short to power source.
No
Next step
Yes
Diagnosis help
6
Check if the electromagnetic clutch of A/C compressor operates
normally.
No
Repair or replace
the
electromagnetic
clutch
Fault code: P1651 “the control circuit of engine malfunction lamp (SVS) 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
Yes
Next step
2
Test the action of engine malfunction lamp by the “Actuator action
test” of diagnosis device, and observe if it is always off or on.
No
The system is
normal.