Electrical Control Valve

ECV (ELECTRICAL CONTROL VALVE)





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 POWER SUPPLY FOR ECV (ELECTRIC CONTROL VALVE)
1. Disconnect compressor (ECV) connector.
2. Turn ignition switch ON.
3. Check voltage between compressor (ECV) harness connector and ground.





Is the inspection result normal?
YES - GO TO 3
NO - GO TO 2
2.CHECK FUSE
Check power supply circuit and 10A fuse [No. 3, located in the fuse block (J/B)]. Fuse Block - Junction Box (J/B).
Is the inspection result normal?
YES - Check harness for open circuit. Repair or replace if necessary.
NO - Replace fuse and check harness for short circuit. Repair or replace if necessary.
3.CHECK ECV CONTROL SIGNAL
1. Turn ignition switch OFF.
2. Reconnect compressor (ECV) connector.
3. Perform self-diagnosis. Diagnosis Description Without Plasmacluster System.
4. Set in self-diagnosis STEP-4 (Code No. 45).





5. Confirm ECV control signal between unified meter and A/C amp harness connector M67 terminal 65 and ground using an oscilloscope.
Is the inspection result normal?
YES - Replace compressor.
NO - GO TO 4
4.CHECK CIRCUIT CONTINUITY BETWEEN ECV AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect compressor (ECV) connector and unified meter and A/C amp. connector.
3. Check continuity between compressor (ECV) harness connector and unified meter and A/C amp harness connector.





Is the inspection result normal?
YES - GO TO 5
NO - Repair the harnesses or connectors.
5.CHECK ECV
Check continuity between compressor (ECV) connector.





Is the inspection result normal?
YES - Replace the unified meter and A/C amp.
NO - Replace the compressor.