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Are there holes or loose bolts on exhaust system?
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Repair the exhaust system.
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2.CHECK AIR INTAKE SYSTEM.
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Are there holes, loose bolts or disconnection of hose on air intake system?
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Repair the air intake system.
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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. 
CAUTION:
Release fuel pressure before removing the fuel pressure gauge.
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Is the measured value 338 — 363 kPa (3.4 — 3.7 kgf/cm2, 49 — 53 psi)?
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Repair the following item.
Fuel pressure is too high:
• Clogged fuel line or bent hose
Fuel pressure is too low:
• Improper fuel pump discharge
• Clogged fuel line
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4.CHECK ENGINE COOLANT TEMPERATURE SENSOR.
1) Start the engine and warm up completely.
2) Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”.
• General scan tool
For detailed operation procedures, refer to the general scan tool operation manual.
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Is the engine coolant temperature 75°C (167°F) or higher?
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Replace the engine coolant temperature sensor.
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5.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) For AT models, set the select lever to “P” range or “N” range, and for MT models, place the shift lever in the neutral position.
3) Turn the A/C switch to OFF.
4) Turn all the accessory switches to OFF.
5) Read the data of mass air flow and intake air temperature sensor signal using Subaru Select Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”.
• General scan tool
For detailed operation procedures, refer to the general scan tool operation manual.
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Is the measured value 1.5 — 4.0 g/s (0.20 — 0.53 lb/m) (1.5 L model), or 2.0 — 5.0 g/s (0.26 — 0.66 lb/m) (2.0 L model)?
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Replace the mass air flow and intake air temperature sensor.
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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) For AT models, set the select lever to “P” range or “N” range, and for MT models, place the shift lever in the neutral position.
3) Turn the A/C switch to OFF.
4) Turn all the accessory switches to OFF.
6) Measure the ambient temperature.
7) Read the data of mass air flow and intake air temperature sensor signal using Subaru Select Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”.
• General scan tool
For detailed operation procedures, refer to the general scan tool operation manual.
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Subtract ambient temperature from intake air temperature. Is the obtained value −10 — 50°C (−18 — 90°F)?
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Repair the poor contact of the ECM connector.
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Check the mass air flow and intake air temperature sensor.
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