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 Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Inspection Mode .
Use the check board when measuring the ECM terminal voltage and resistance.

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

Fig 1: Camshaft Position Actuator Control Circuit/Open Bank 2 - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

CHECK OUTPUT SIGNAL OF ECM.
1. Turn the ignition switch to ON.
2. Measure the voltage between ECM connector and chassis ground.
Connector & terminal

(B135) No. 6 (+) - Chassis ground (-):

Is the voltage 10 V or more?
- Yes: Go to 2.
- No: Go to 3.
CHECK FOR POOR CONTACT.
Check for poor contact of ECM connector.

Is there poor contact of ECM connector?
- Yes: Repair the poor contact of ECM connector.
- No: 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.
CHECK POWER SUPPLY TO THE INTAKE OIL CONTROL SOLENOID LH.
Measure the voltage between intake oil control solenoid LH connector and engine ground.

Connector & terminal

(E37) No. 1 (+) - Engine ground (-):

Is the voltage 10 V or more?
- Yes: Go to 4.
- No: Repair the power supply circuit.
CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH CONNECTOR.
1. Turn the ignition switch to OFF.
2. Disconnect the connector from the intake oil control solenoid LH.
3. Disconnect the connector from ECM.
4. Measure the resistance between intake oil control solenoid LH connector and engine ground.
Connector & terminal

(E37) No. 2 - Engine ground:

Is the resistance 1 MΩ or more?
- Yes: Go to 5.
- No: Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid LH connector.
CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH CONNECTOR.
Measure the resistance of harness between ECM connector and intake oil control solenoid LH.

Connector & terminal

(B135) No. 6 - (E37) No. 2:

Is the resistance less than 1 Ω?
- Yes: Go to 6.
- No: repair the harness and connector.
  NOTE:
  In this case, repair the following item:
  - Open circuit in harness between ECM connector and intake oil control solenoid LH connector
  - Poor contact of coupling connector
CHECK INTAKE OIL CONTROL SOLENOID LH.
Measure the resistance between intake oil control solenoid LH terminals.

Terminals

No. 1 -No. 2:

Is the resistance 6 - 12 Ω?
- Yes: Repair the poor contact of intake oil control solenoid LH connector.
- No: Replace the intake oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Oil Control Solenoid .