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M/T

DTC P0443 - EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT LOW INPUT

DTC DETECTING CONDITION:
- Two consecutive driving cycles with fault

TROUBLE SYMPTOM:
- Erroneous idling

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How To Clear Diagnostic Trouble Codes.

Wiring Diagram:





WIRING DIAGRAM

10AJ1: CHECK OUTPUT SIGNAL FROM ECM.

1. Turn ignition switch to ON.

Connector & Terminal -[(B134) No.2 (+) - Chassis Ground (-)]:





2. Measure voltage between ECM and chassis ground.

CHECK: Is the voltage more than 10 V?

YES: Even if MIL lights up, the circuit has returned to a normal condition at this time. Contact with Subaru of America (SOA) service.

NOTE: Inspection by Subaru of America's DTM is required, because probable cause is deterioration of multiple parts.

NO: Go to step 10AJ2.

10AJ2: CHECK HARNESS BETWEEN PURGE CONTROL SOLENOID VALVE AND ECM CONNECTOR.

1. Turn ignition switch to OFF
2. Disconnect connectors from purge control solenoid valve and ECM.

Connector & Terminal -[(E4) No.2 - Engine Ground]:





3. Measure resistance of harness between purge control solenoid valve connector and engine ground

CHECK: Is the resistance less than 10 Ohms?

YES: Repair ground short circuit in harness between ECM and purge control solenoid valve connector.

NO: Go to step 10AJ3.

10AJ3: CHECK HARNESS BETWEEN PURGE CONTROL SOLENOID VALVE AND ECM CONNECTOR.

Connector & Terminal - [(B134) No.2 - (E4) No.2]:





Measure resistance of harness between ECM and purge control solenoid valve of harness connector.

CHECK: Is the resistance less than 1 Ohm?

YES: Go to step 10AJ4.

NO: Repair open circuit in harness between ECM and purge control solenoid valve connector.

NOTE: In this case, repair the following:
- Open circuit in harness between ECM and purge control solenoid valve connector
- Poor contact in coupling connector (B22)

10AJ4: CHECK PURGE CONTROL SOLENOID VALVE.

1. Remove purge control solenoid valve.

Terminals - [No.1 - No.2]:





2. Measure resistance between purge control solenoid valve terminals.

CHECK: Is the resistance between 10 and 100

YES: Go to step 10AJ5.

NO: Replace purge control solenoid valve.

10AJ5: CHECK POWER SUPPLY TO PURGE CONTROL SOLENOID VALVE.

1. Turn ignition switch to ON.

Connector & Terminal - [(E4) No.1 (+) - Engine Ground (-)]:





2. Measure voltage between purge control solenoid valve and engine ground.

CHECK: Is the voltage more than 10 V?

YES: Go to step 10AJ6.

NO: Repair open circuit in harness between main relay and purge control solenoid valve connector.

10AJ6: CHECK POOR CONTACT.
Check poor contact in purge control solenoid valve connector.

CHECK: Is there poor contact in purge control solenoid valve connector?

YES: Repair poor contact in purge control solenoid valve connector.

NO: Contact with Subaru of America (SOA) service.

NOTE: Inspection by Subaru of America's DTM is required, because probable cause is deterioration of multiple parts.