P0443
AI: DTC P0443 - EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT LOW INPUTDTC 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. Clearing Diagnostic Trouble Codes
WIRING DIAGRAM
10AI1: 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 10AI2.
10AI2: 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 ohm?
YES: Repair ground short circuit in harness between ECM and purge control solenoid valve connector.
NO: Go to step 10AI3.
10AI3: 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 10AI4.
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 (B21)
10AI4: 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 Kohm?
YES: Go to step 10AI5.
NO: Replace purge control solenoid valve.
10AI5: 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 10AI6.
NO: Repair open circuit in harness between main relay and purge control solenoid valve connector.
10AI6: 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.