DTC P0077 Intake Valve Control Circuit High (Bank 1)

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

DTC DETECTING CONDITION:

Detect as soon as malfunction occurs.
GENERAL DESCRIPTION < Ref. to , DTC P0077 INTAKE VALVE CONTROL CIRCUIT HIGH (BANK 1) , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Erroneous idling

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

WIRING DIAGRAM:

Fig 1: Identifying Intake Valve Control Circuit Wiring Diagram (DTC P0077)

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE - DTC P0077 INTAKE VALVE CONTROL CIRCUIT HIGH

Step		Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND OIL SWITCHING SOLENOID VALVE. Turn the ignition switch to OFF. Disconnect the connector from ECM and oil switching solenoid valve. Measure the resistance between oil switching solenoid valve and engine ground. Connector & terminal (E69) No. 1 - Engine ground: (E69) No. 2 - Engine ground:		Is the resistance more than 1 M?	Go to step 2.	Repair the short circuit between ECM and oil switching solenoid valve connector.
2 CHECK OIL SWITCHING SOLENOID VALVE. Remove the oil switching solenoid valve connector. Measure the resistance between oil switching solenoid valve terminals. Terminals No. 1 - No. 2:		Is the resistance 6 - 12 ?	Repair the poor contact in ECM and oil switching solenoid valve.	Replace the oil switching solenoid valve. < Ref. to OIL SWITCHING SOLENOID VALVE .