DTC P2420: EVAP System Switching Valve Control Circuit High: Notes

WARNING: This page is about a different variant/trim than selected.

DTC detecting condition:

Immediately at fault recognition

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to OPERATION , Clear Memory Mode and Inspection Mode Ref. to PROCEDURE , Inspection Mode.

Wiring diagram:

Engine Electrical System Ref. to WIRING DIAGRAM , Engine Electrical System.

Fig 1: EVAP System Switching Valve Control Circuit High Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from the leak check valve assembly. Turn the ignition switch to ON. Measure the voltage between leak check valve assembly and chassis ground. Connector & terminal (R400) No. 1 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Repair the short circuit to power in harness between ECM connector and leak check valve assembly connector.	Go to step 2 .
2 CHECK LEAK CHECK VALVE ASSEMBLY. Turn the ignition switch to OFF. Check the switching valve of the leak check valve assembly. Ref. to CHECK SWITCHING VALVE , INSPECTION, Leak Check Valve Assembly.	Is the check result OK?	Repair the poor contact in the leak check valve assembly connector.	Replace the leak check valve assembly. Ref. to LEAK CHECK VALVE ASSEMBLY