ECV (Electrical Control Valve)

ECV (ELECTRICAL CONTROL VALVE)





Description
The ECV (electrical control valve) is installed on 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:
Type B.
Is the inspection result normal?
YES - GO TO 2.
NO - Replace the fuse after repairing the applicable circuit.
2.CHECK ECV POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the ECV connector.
3. Turn the ignition switch ON.
4. Check voltage between the ECV harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair the harnesses or connectors.
3.CHECK ECV CONTROL SIGNAL
1. Turn the ignition switch OFF.
2. Connect the ECV connector.
3. Perform the self-diagnosis STEP-4 (Code No. 45). Diagnosis Description Unified Meter & A/C Amp Without ACCS (WITHOUT ACCS) or Diagnosis Description With ACCS Unified Meter & A/C Amp (WITH ACCS).
4. Check output waveform between the unified meter and A/C amp. harness connector and ground with the oscilloscope.






Is the inspection result normal?
YES - Replace the compressor.
NO - GO TO 4.
4.CHECK CONTINUITY BETWEEN ECV AND UNIFIED METER AND A/C AMP.
1. Turn the ignition switch OFF.
2. Disconnect the ECV connector.
3. Disconnect the unified meter and A/C amp. connector.
4. Check continuity between the ECV harness connector and unified meter and A/C amp. harness connector.





5. Check for continuity between the ECV harness connector and ground.





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





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