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HOMESERVICE MANUALSSUBARU2005OUTBACK I, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - ENGINE (DIAGNOSTICS) (H4SO)GENERAL DIAGNOSTIC TABLEINSPECTIONENGINE
2005 Subaru Outback i, Standard

General Diagnostic Table: Inspection: Engine

2005 Subaru Outback i, StandardSECTION Engine
NOTE: Malfunction of parts other than those listed is also possible. < Ref. to ENGINE TROUBLE IN GENERAL . >
GENERAL DIAGNOSTIC

Symptom Problem parts
1. Engine stalls during idling.
  1. Manifold absolute pressure sensor
  2. Intake air temperature sensor
  3. Air flow and ignition parts ((1))
  4. Engine coolant temperature sensor ((2))
  5. Crankshaft position sensor ((3))
  6. Camshaft position sensor ((3))
  7. Fuel injection parts ((4))
2. Rough idling
  1. Manifold absolute pressure sensor
  2. Intake air temperature sensor 3)
  3. Engine coolant temperature sensor ((2))
  4. Air flow and 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 valve
3. Engine does not return to idle.
  1. Engine coolant temperature sensor
  2. Throttle position sensor
  3. Manifold absolute pressure sensor
  4. Air flow and intake air temperature sensor
  5. EGR valve
4. Poor acceleration
  1. Manifold absolute pressure sensor
  2. 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. A/C switch and A/C cut relay
  10. Engine torque control signal circuit
  11. Ignition parts ((1))
  12. EGR valve
5. Engine stalls or engine sags or hesitates at acceleration.
  1. Manifold absolute pressure sensor
  2. 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 valve
6. Surge
  1. 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 valve
7. Spark knock
  1. 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 valve
8. After burning in exhaust system
  1. 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 ignitor assembly and spark plug.
(2) Indicate the symptom occurring only in cold temperatures.
(3) Ensure the secure installation.
(4) Check fuel injector, fuel pressure regulator and fuel filter.
(5) Inspect air leak in air intake system.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.