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Subaru Legacy Service Manual: General diagnostic table inspection

Subaru Legacy Service Manual / Engine (diagnostics)(h6do) / General diagnostic table inspection

NOTE:

Malfunction of parts other than those listed is also possible. Engine Trouble in General

Symptoms

Faulty parts

1. Engine stalls during idling.

1) Manifold absolute pressure sensor

2) Mass air flow and intake air temperature sensor

3) Ignition parts (*1)

4) Engine coolant temperature sensor (*2)

5) Crankshaft position sensor (*3)

6) Camshaft position sensor (*3)

7) Fuel injection parts (*4)

8) Electronic throttle control

2. Rough idling

1) Manifold absolute pressure sensor

2) Mass air flow and intake air temperature sensor

3) Engine coolant temperature sensor (*2)

4) Ignition parts (*1)

5) Air intake system (*5)

6) Fuel injection parts (*4)

7) Electronic throttle control

8) Crankshaft position sensor (*3)

9) Camshaft position sensor (*3)

10) Oxygen sensor

11) Fuel pump and fuel pump relay

12) EGR control valve

3. Engine does not return to idle.

1) Engine coolant temperature sensor

2) Electronic throttle control

3) Manifold absolute pressure sensor

4) Mass air flow and intake air temperature sensor

5) Accelerator pedal position sensor

6) Engine oil temperature sensor

7) EGR control valve

4. Poor acceleration

1) Manifold absolute pressure sensor

2) Mass air flow and intake air temperature sensor

3) Electronic throttle control

4) Fuel injection parts (*4)

5) Fuel pump and fuel pump relay

6) Engine coolant temperature sensor (*2)

7) Crankshaft position sensor (*3)

8) Camshaft position sensor (*3)

9) EGR control valve

10) Engine torque control signal circuit

11) Ignition parts (*1)

12) Accelerator pedal position sensor

13) Engine oil temperature sensor

5. Engine stalls, hesitates, or sputters at acceleration.

1) Manifold absolute pressure sensor

2) Mass air flow and intake air temperature sensor

3) Engine coolant temperature sensor (*2)

4) Crankshaft position sensor (*3)

5) Camshaft position sensor (*3)

6) Purge control solenoid valve

7) Fuel injection parts (*4)

8) Electronic throttle control

9) Fuel pump and fuel pump relay

10) EGR control valve

6. Surging

1) Mass air flow and intake air temperature sensor

2) Manifold absolute pressure sensor

3) Engine coolant temperature sensor (*2)

4) Crankshaft position sensor (*3)

5) Camshaft position sensor (*3)

6) Fuel injection parts (*4)

7) Electronic throttle control

8) Fuel pump and fuel pump relay

9) EGR control valve

7. Spark knock

1) Mass air flow and intake air temperature sensor

2) Manifold absolute pressure sensor

3) Engine coolant temperature sensor

4) Knock sensor

5) Fuel injection parts (*4)

6) Fuel pump and fuel pump relay

7) EGR control valve

8. After burning in exhaust system

1) Mass air flow and intake air temperature sensor

2) Manifold absolute pressure sensor

3) Engine coolant temperature sensor (*2)

4) Fuel injection parts (*4)

5) Fuel pump and fuel pump relay

*1: Check ignition coil and spark plug.

*2: Indicate the symptom occurring only in cold temperatures.

*3: Ensure secure installation.

*4: Check the fuel injector and fuel pressure regulator.

*5: Inspect for air leak in air intake system.

Electrical component location location
1. CONTROL MODULE(1)Engine control module (ECM)(3)Data link connector(5)Delivery (test) mode fuse(2)Fuel pump control module (ECM)(4)Malfunction indicator light • Sedan model• OUTBACK mod ...

General scan tool operation
1. HOW TO USE GENERAL SCAN TOOL1. Prepare a scan tool (general scan tool) required by SAE J1978.2. Connect the general scan tool to data link connector located in the lower portion of the instrument p ...

Other materials:

Basic operation
By operating " " or " " of the control switch, the screens and selection items can be switched. When the " /SET" switch is pulled toward you, the item can be selected and set. If there are some useful messages, such as vehicle information, warning information, etc., they will interrupt t ...

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