DTC P0448 Evaporative Emission Control System Vent Control Circuit Shorted: Wiring Diagram

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

Fig 1: Evaporative Emission Control System - Wiring Diagram

G06647806

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND DRAIN VALVE CONNECTOR . Turn the ignition switch to OFF. Disconnect the connectors from the ECM and drain valve. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector & terminal (B135) No. 4 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Repair the short circuit to power in the harness between ECM and drain valve connector.	Go to step 2 .
2 CHECK DRAIN VALVE . Turn the ignition switch to OFF. Measure the resistance between drain valve terminals. Terminals No. 1 - No. 2:	Is the resistance less than 1 Ω?	Replace the drain valve. Ref. to DRAIN VALVE .	Repair the poor contact of ECM connector.