DTC P1447 Fuel Tank Sensor Control Valve Circuit High

DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
GENERAL DESCRIPTION < Ref. to DTC P1447 FUEL TANK SENSOR CONTROL VALVE CIRCUIT HIGH , Diagnostic Trouble Code (DTC) Detecting Criteria. >

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE < Ref. to , OPERATION , Clear Memory Mode.> and INSPECTION MODE < Ref. to , PROCEDURE , Inspection Mode.>.

WIRING DIAGRAM:

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

Courtesy of SUBARU OF AMERICA, INC.

DTC P1447 FUEL TANK SENSOR CONTROL VALVE CIRCUIT HIGH DIAGNOSIS

Step	Check	Yes	No
1. CHECK OUTPUT SIGNAL FROM ECM. Turn 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 ignition switch to OFF. Disconnect the connector from fuel tank sensor control valve. Turn 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 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 Ω?	Replace the fuel tank sensor control valve < Ref. to DRAIN 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) . >