DTC P0459 Evaporative Emission System Purge Control Valve Circuit High: Wiring Diagram

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 of harness to power supply 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. Ref. to PURGE CONTROL SOLENOID VALVE .	Repair the poor contact of ECM connector.