Subaru Legacy (2005 year). Service manual — part 159
EN(H4SO 2.0)(diag)-225
ENGINE (DIAGNOSTICS)
General Diagnostic Table
*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 the fuel injector and fuel pressure regulator.
*5: Inspect air leak in air intake system.
6. Surging
1) 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) 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) 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
Symptom
Problem parts
EN(H4SO 2.0)(diag)-226
ENGINE (DIAGNOSTICS)
General Diagnostic Table
FUEL INJECTION (FUEL SYSTEMS)
FU(H4SO 2.5)
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Throttle Body. . . . . . . . . . . . . . . . . . . . . . . .11
Intake Manifold. . . . . . . . . . . . . . . . . . . . . . ..12
Engine Coolant Temperature Sensor. . . . . . . . . . . . . . 20
Crankshaft Position Sensor. . . . . . . . . . . . . . . . . ...21
Camshaft Position Sensor. . . . . . . . . . . . . . . . . . .22
Knock Sensor. . . . . . . . . . . . . . . . . . . . . . . 23
Throttle Position Sensor. . . . . . . . . . . . . . . . . . . 24
Manifold Absolute Pressure Sensor. . . . . . . . . . . . . . ..25
Mass Air Flow and Intake Air Temperature Sensor . . . . . . . . ..26
Intake Air Temperature Sensor . . . . . . . . . . . . . . . . .27
Tumble Generator Valve Assembly . . . . . . . . . . . . . . ..28
Tumble Generator Valve Actuator. . . . . . . . . . . . . . . .29
Tumble Generator Valve Position Sensor. . . . . . . . . . . . .30
EGR Valve . . . . . . . . . . . . . . . . . . . . . . . . 31
Fuel Injector . . . . . . . . . . . . . . . . . . . . . . . ..32
Front Oxygen (A/F) Sensor . . . . . . . . . . . . . . . . . ...35
Rear Oxygen Sensor. . . . . . . . . . . . . . . . . . . . .36
Engine Control Module (ECM) . . . . . . . . . . . . . . . . ..37
Main Relay . . . . . . . . . . . . . . . . . . . . . . . . 38
Fuel Pump Relay. . . . . . . . . . . . . . . . . . . . . ...39
Electronic Throttle Control Relay . . . . . . . . . . . . . . . ..40
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . ...41
Fuel Tank . . . . . . . . . . . . . . . . . . . . . . . . ..42
Fuel Filler Pipe . . . . . . . . . . . . . . . . . . . . . . ..48
Fuel Pump. . . . . . . . . . . . . . . . . . . . . . . . .50
Fuel Level Sensor . . . . . . . . . . . . . . . . . . . . . .52
Fuel Sub Level Sensor. . . . . . . . . . . . . . . . . . . ..53
Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . ..54
Fuel Damper Valve . . . . . . . . . . . . . . . . . . . . ...55
Fuel Delivery, Return and Evaporation Lines. . . . . . . . . . . 56
Fuel System Trouble in General . . . . . . . . . . . . . . . ...59
FU(H4SO 2.5)-2
FUEL INJECTION (FUEL SYSTEMS)
General Description
1. General Description
A: SPECIFICATION
Fuel tank
Capacity
64
2 (16.9 US gal, 14.1 Imp gal)
Location
Under rear seat
Fuel pump
Type
Impeller
Shutoff discharge pressure
441 — 686 kPa (4.50 — 7.00 kgf/cm
2
, 64.0 — 99.5 psi)
Discharge rate
75
2 (19.8 US gal, 16.5 Imp gal)/h or more
[12 V at 300 kPa (3.06 kgf/cm
2
, 43.5 psi)]
Fuel filter
In-tank type
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