DTC P0459: Evaporative Emission System Purge Control Valve 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 Purge Control Valve - Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE. Turn the ignition switch to OFF. Disconnect the connectors from ECM and purge control solenoid valve. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector & terminal (B137) No. 6 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Repair the short circuit to power in the harness between ECM and purge control solenoid valve connector.	Go to step 2 .
2 CHECK PURGE CONTROL SOLENOID VALVE. Turn the ignition switch to OFF. Measure the resistance between purge control solenoid valve terminals. Terminals No. 1 - No. 2:	Is the resistance less than 1 Ω?	Replace the purge control solenoid valve. Refer to PURGE CONTROL SOLENOID VALVE .	Repair the poor contact of ECM connector.