Wiring Diagram:

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

Fig 1: Wiring Diagram - DTC P1447 Fuel Tank Sensor Control Valve Circuit High

G03830039

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE (DTC P1447)

Step		Check	Yes	No
1 CHECK OUTPUT SIGNAL FROM ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector & terminal (B134) No. 24 (+) - Chassis ground (-):		Is the voltage more than 10 V?	Go to step 3.	Go to step 2.
2 CHECK POOR CONTACT. Check poor contact in ECM connector.		Is there poor contact in ECM connector?	Repair poor contact in ECM connector.	Replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . >
3 CHECK HARNESS BETWEEN FUEL TANK SENSOR CONTROL VALVE AND ECM CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from fuel tank sensor control valve. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector & terminal (B134) No. 24 (+) - Chassis ground (-):		Is the voltage more than 10 V?	Repair short circuit to battery in harness between ECM and fuel tank sensor control valve connector. After repair, replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . >	Go to step 4.
4 CHECK FUEL TANK SENSOR CONTROL VALVE. Turn the ignition switch to OFF. Measure the resistance between fuel tank sensor control valve terminals. Terminals No. 1 - No. 2:		Is the resistance less than 1 ?	Replace the fuel tank sensor control valve < Ref. to FUEL TANK SENSOR CONTROL VALVE . > and the ECM < Ref. to , ENGINE CONTROL MODULE (ECM) .>.	Go to step 5.
5 CHECK POOR CONTACT. Check poor contact in ECM connector.		Is there poor contact in ECM connector?	Repair poor contact in ECM connector.	Replace the ECM. < Ref. to , ENGINE CONTROL MODULE (ECM) . >