Nissan GT-R (R35) · Service Manual
VENTILATION, HEATER & AIR CONDITIONER
VENTILATION, HEATER & AIR CONDITIONER › HEATER & AIR CONDITIONING CONTROL SYSTEM › COMPONENT DIAGNOSIS
ECV (ELECTRICAL CONTROL VALVE)
AUTOMATIC AIR CONDITIONER
Description
Diagnosis Procedure
Description
The ECV (electrical control valve) is installed in the compressor and controls it for emitting appropriate amount of refrigerant when necessary.
Diagnosis Procedure
1.CHECK FUSE
Check 10A fuse [No. 3, located in the fuse block (J/B)].
NOTE：
Refer to
Fuse, Connector and Terminal Arrangement
.
Is the inspection result normal?
YES
>>
GO TO 2
.
NO
>>
Replace the fuse after repairing the applicable circuit.
2.CHECK ECV (ELECTRIC CONTROL VALVE) POWER SUPPLY CIRCUIT
Disconnect the compressor (ECV) connector.
Turn the ignition switch ON.
Check voltage between compressor (ECV) harness connector and ground.
(+)
(−)
Voltage
Compressor (ECV)
—
Connector
Terminal
F36
2
Ground
Battery voltage
Is the inspection result normal?
YES
>>
GO TO 3
.
NO
>>
Repair the harnesses or connectors.
3.CHECK ECV CONTROL SIGNAL
With CONSULT-III
Turn the ignition switch OFF.
Connect the compressor (ECV) connector.
Perform the “HVAC TEST”: MODE 5 of HVAC active test mode.
Check output waveform between the A/C auto amp. harness connector and ground with the oscilloscope.
(+)
(−)
Condition
Output waveform
A/C auto amp.
—
Connector
Terminal
M66
24
Ground
HVAC TEST: MODE 5
Duty ratio: approx. 50 %
Is the inspection result normal?
YES
>>
Replace the compressor.
NO
>>
GO TO 4
.
4.CHECK CONTINUITY BETWEEN ECV AND A/C AUTO AMP.
Turn the ignition switch OFF.
Disconnect the compressor (ECV) connector.
Disconnect the A/C auto amp. connector.
Check continuity between compressor (ECV) harness connector and A/C auto amp. harness connector.
Compressor (ECV)
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
F36
3
M66
24
Existed
Is the inspection result normal?
YES
>>
GO TO 5
.
NO
>>
Repair the harnesses or connectors.
5.CHECK ECV
Check continuity between compressor (ECV) connector terminals.
Compressor (ECV)
Continuity
Connector
Terminal
Connector
Terminal
F36
2
F36
3
Existed
Is the inspection result normal?
YES
>>
Replace the A/C auto amp.
NO
>>
Replace the compressor.
1.CHECK FUSE
With CONSULT-III