DTC P2420: Evaporative Emission System Switching Valve Control Circuit High: Wiring Diagram

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

Engine electrical system, 3.6 L model (without push button start). See appropriate SYSTEM WIRING DIAGRAM article.
Engine electrical system, 3.6 L model (with push button start). See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Evaporative Emission System Pressure Sensor/Switch - Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

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 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. Refer to CHECK SWITCHING VALVE .	Is the switching valve of the leak check valve assembly OK?	Repair the poor contact in the leak check valve assembly connector.	Replace the leak check valve assembly. Refer to LEAK CHECK VALVE ASSEMBLY .