P0130

N: DTC P0130 - FRONT OXYGEN SENSOR CIRCUIT MALFUNCTION

DTC DETECTING CONDITION:
- Two consecutive driving cycles with fault

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

10N1: CHECKING FOR CAUSES AFFECTING EXHAUST GAS.

NOTE:
- Check for use to improper fuel.
- Check if engine oil or coolant level is extremely low.

CHECK: Is CO % more than 2% after engine warm-up?

YES: Check fuel system.

NO: Go to step 10N2.

10N2: CHECK FRONT OXYGEN SENSOR DATA.

1) Turn ignition switch to OFF.





2) Connect the Subaru Select Monitor or the OBD-II general scan tool to data link connector.

3) Start engine and Turn the Subaru Select Monitor and the OBD-II general scan tool switch to ON.

4) Warm-up the engine until coolant temperature is above 70°C (160°F) and keep the engine speed at 2,000 rpm to 3,000 rpm for one minute.

5) Read data of front oxygen sensor signal using Subaru Select Monitor or OBD-II general scan tool.

NOTE:
- Subaru Select Monitor
For detailed operation procedure, refer to the "READ OXYGEN SENSOR MONITORING TEST RESULTS DATA SHOWN ON DISPLAY FOR ENGINE".
- OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

CHECK: Is the difference of voltage less than 0.1 V between the value of max. output and mm. output?

YES: Go to step 10N3.

NO: Replace front oxygen sensor.

10N3: CHECK HARNESS BETWEEN FRONT OXYGEN SENSOR AND ECM CONNECTOR.
1) Turn ignition switch to OFF.

2) Disconnect connector from front oxygen sensor.

3) Turn ignition switch to ON.

Connector & Terminal (E24) No.3 (+) - Engine Ground (-):

4) Measure voltage between front oxygen sensor harness connector and engine ground.

CHECK: Is the voltage more than 0.2 V?

YES: Go to step 10N4.

NO: Repair harness and connector.

NOTE:
In this case, repair the following:
- Open circuit in harness between ECM and front oxygen sensor connector
- Poor contact in the ECM connector

10N4: CHECK POOR CONTACT.
Check poor contact in front oxygen sensor connector.

CHECK: Is there poor contact in front oxygen sensor connector?

YES: Repair poor contact in front oxygen sensor connector.

NO: Replace front oxygen sensor.