DTC P0020: "A" Camshaft Position Actuator Control Circuit/Open Bank 2: Notes

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

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Improper idling

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to OPERATION , Clear Memory Mode and Inspection Mode Ref. to PROCEDURE , Inspection Mode.

Wiring diagram:

Engine Electrical System Ref. to WIRING DIAGRAM , Engine Electrical System.

Fig 1: Intake Oil Flow Control Solenoid Valve Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK OUTPUT SIGNAL OF ECM. Turn the ignition switch to ON. Measure the voltage between ECM connector and engine ground. Connector & terminal (E158) No. 6 (+) - Engine ground (-):	Is the voltage 10 V or more?	Go to step 2	Go to step 3
2 CHECK FOR POOR CONTACT. Check for poor contact of ECM connector.	Is there poor contact of ECM connector?	Repair the poor contact of ECM connector.	Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
3 CHECK POWER SUPPLY TO THE INTAKE OIL FLOW CONTROL SOLENOID VALVE LH. Measure the voltage between intake oil flow control solenoid valve LH connector and engine ground. Connector & terminal (E37) No. 1 (+) - Engine ground (-):	Is the voltage 10 V or more?	Go to step 4	Repair the power supply circuit.
4 CHECK HARNESS BETWEEN ECM AND INTAKE OIL FLOW CONTROL SOLENOID VALVE LH CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connector from the intake oil flow control solenoid valve LH. Measure the resistance between intake oil flow control solenoid valve LH connector and engine ground. Connector & terminal (E37) No. 2 - Engine ground:	Is the resistance 1 MΩ or more?	Go to step 5	Repair the short circuit to ground in harness between ECM connector and intake oil flow control solenoid valve LH connector.
5 CHECK HARNESS BETWEEN ECM AND INTAKE OIL FLOW CONTROL SOLENOID VALVE LH CONNECTOR. Measure the resistance of harness between ECM connector and intake oil flow control solenoid valve LH. Connector & terminal (E158) No. 6 - (E37) No. 2:	Is the resistance less than 1 Ω?	Go to step 6	Repair the open circuit in harness between ECM connector and intake oil flow control solenoid valve LH connector.
6 CHECK INTAKE OIL FLOW CONTROL SOLENOID VALVE LH. Measure the resistance between intake oil flow control solenoid valve LH terminals. Terminals No. 1 - No. 2:	Is the resistance 6 - 12 Ω?	Repair the poor contact of intake oil flow control solenoid valve LH connector.	Replace the intake oil flow control solenoid valve LH. Ref. to OIL FLOW CONTROL SOLENOID VALVE