ECV (Electrical Control Valve)

ECV (ELECTRICAL CONTROL VALVE)

Diagnosis Procedure


1. CHECK ECV (ELECTRICAL CONTROL VALVE) POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect compressor connector.
3.Turn ignition switch ON.
4.Check voltage between compressor harness connector and ground.





Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 2.

2. CHECK FUSE

1.Turn ignition switch OFF.
2.Check 10 A fuse [No. 30, located in fuse block (J/B)]. Refer to "Terminal Arrangement" Fuse Block - Junction Box (J/B)
Is the inspection result normal?
YES- GO TO 3.
NO- Replace the blown fuse after repairing the affected circuit.

3. CHECK ECV POWER SUPPLY CIRCUIT FOR OPEN

1.Disconnect fuse block (J/B) connector.
2.Check continuity between compressor harness connector and fuse block (J/B) harness connector.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair harness or connector.

4. CHECK ECV POWER SUPPLY CIRCUIT FOR SHORT

1.Disconnect A/C auto amp. connector and A/C switch assembly connector.
2.Check continuity between compressor harness connector and ground.





Is the inspection result normal?
YES- Check ignition power supply circuit. Refer to "Wiring Diagram Ignition Power Supply " Ignition Power Supply.
NO- Repair harness or connector.

5. CHECK ECV CONTROL SIGNAL CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect A/C auto amp. connector.
3.Check continuity between compressor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 6.
NO- Repair harness or connector.

6. CHECK ECV CONTROL SIGNAL CIRCUIT FOR SHORT

Check continuity between compressor harness connector and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- Repair harness or connector.

7. CHECK ECV

Check ECV. Refer to "Component Inspection" .
Is the inspection result normal?
YES- GO TO 8.
NO- Replace compressor. Refer to "COMPRESSOR : Removal and Installation" Removal And Installation.

8. CHECK INTERMITTENT INCIDENT

Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- Replace A/C auto amp. Refer to "Removal and Installation" Removal And Installation.
NO- Repair or replace malfunctioning parts.


Component Inspection


1. CHECK ECV (ELECTRICAL CONTROL VALVE)

1.Turn ignition switch OFF.
2.Disconnect compressor connector.
3.Check continuity between compressor connector F88 terminals.





Is the inspection result normal?
YES- Inspection End.
NO- Replace compressor. Refer to "COMPRESSOR : Removal and Installation" Removal And Installation.