DTC P0077 Intake Valve Control Solenoid Circuit High (Bank 1): Wiring Diagram

Fig 1: Intake Valve Control Solenoid Wiring Diagram - Circuit High (Bank 1)

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND OIL SWITCHING SOLENOID VALVE RH CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from the ECM and oil switching solenoid valve RH. Measure the voltage between ECM and chassis ground. Connector & terminal (B134) No. 7 (+) - Chassis ground (-): (B134) No. 15 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Go to step 2.	Repair the short circuit to power supply in harness between ECM and oil switching solenoid valve RH connector.
2 CHECK HARNESS BETWEEN ECM AND OIL SWITCHING SOLENOID VALVE RH CONNECTOR. Measure the resistance of harness between ECM and oil switching solenoid valve RH connector. Connector & terminal (B134) No. 7 - (E69) No. 1: (B134) No. 15 - (E69) No. 2:	Is the resistance less than 1 Ω?	Go to step 3.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and oil switching solenoid valve RH connector Poor contact of coupling connector
3 CHECK OIL SWITCHING SOLENOID VALVE RH. Measure the resistance between oil switching solenoid valve RH terminals. Terminals No. 1 - No. 2:	Is the resistance 6 - 12 Ω?	Repair the poor contact of ECM and oil switching solenoid valve RH connector.	Replace the oil switching solenoid valve RH. Refer to OIL SWITCHING SOLENOID VALVE Oil Switching Solenoid Valve.