| Are there holes or loose bolts on exhaust system- | Repair the exhaust system. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0175 SYSTEM TOO RICH BANK 2 |
2.CHECK AIR INTAKE SYSTEM. | Are there holes, loose bolts or disconnection of hose on air intake system- | Repair the air intake system. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0175 SYSTEM TOO RICH BANK 2 |
3.CHECK FUEL PRESSURE. WARNING: Place “NO OPEN FLAMES” signs near the working area. CAUTION: Be careful not to spill fuel. Measure the fuel pressure. Fuel Pressure > INSPECTION CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure. | Is the measured value 340 — 400 kPa (3.5 — 4.1 kgf/cm2, 49 — 58 psi)- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0175 SYSTEM TOO RICH BANK 2 | Check the fuel pump and fuel delivery line. Fuel Pump > INSPECTION Fuel Delivery and Evaporation Lines > INSPECTION |
4.CHECK ENGINE COOLANT TEMPERATURE SENSOR. 1) Start the engine and warm up completely. 2) Read the value of «Coolant Temp.» using the Subaru Select Monitor or a general scan tool. NOTE: • Subaru Select Monitor For detailed operation procedures, refer to “Read Current Data For Engine”. Subaru Select Monitor • General scan tool For detailed operation procedures, refer to the general scan tool operation manual. | Is the value of «Coolant Temp.» 75°C (167°F) or more- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0175 SYSTEM TOO RICH BANK 2 | Replace the engine coolant temperature sensor. Engine Coolant Temperature Sensor |
5.CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR SIGNAL. 1) Start the engine and warm up engine until coolant temperature is higher than 75°C (167°F). 2) Place the select lever in “P” range or “N” range. 3) Turn the A/C switch to OFF. 4) Turn all the accessory switches to OFF. 5) Read the value of «Mass Air Flow» using the Subaru Select Monitor or a general scan tool. NOTE: • Subaru Select Monitor For detailed operation procedures, refer to “Read Current Data For Engine”. Subaru Select Monitor • General scan tool For detailed operation procedures, refer to the general scan tool operation manual. | Is the value of «Mass Air Flow» 2.0 — 5.0 g/s (0.26 — 0.66 lb/m)- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0175 SYSTEM TOO RICH BANK 2 | Replace the mass air flow and intake air temperature sensor. Mass Air Flow and Intake Air Temperature Sensor |
6.CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. 1) Start the engine and warm up engine until coolant temperature is higher than 75°C (167°F). 2) Place the select lever in “P” range or “N” range. 3) Turn the A/C switch to OFF. 4) Turn all the accessory switches to OFF. 6) Measure the ambient temperature. 7) Read the value of «Intake Air Temp.» using the Subaru Select Monitor or a general scan tool. NOTE: • Subaru Select Monitor For detailed operation procedures, refer to “Read Current Data For Engine”. Subaru Select Monitor • General scan tool For detailed operation procedures, refer to the general scan tool operation manual. | Subtract ambient temperature from «Intake Air Temp.». Is the obtained value −10 — 50°C (−18 — 90°F)- | Repair the poor contact of ECM connector. | Check the mass air flow and intake air temperature sensor. Mass Air Flow and Intake Air Temperature Sensor |
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