Subaru Legacy III (2000-2003 year). Service manual — part 173
EN(H4SO)-304
ENGINE (DIAGNOSTICS)
GENERAL DIAGNOSTIC TABLE
20.General Diagnostic Table
A: INSPECTION
1. ENGINE
NOTE:
Malfunction of parts other than those listed is also possible. <Ref. to ME(H4SO)-89, Engine Trouble in Gen-
eral.>
Symptom
Problem parts
1. Engine stalls during idling.
1) Idle air control solenoid valve
2) Intake manifold pressure sensor
3) Intake air temperature sensor
4) Intake air temperature and pressure sensor
5) Ignition parts (*1)
6) Engine coolant temperature sensor (*2)
7) Crankshaft position sensor (*3)
8) Camshaft position sensor (*3)
9) Fuel injection parts (*4)
2. Rough idling
1) Idle air control solenoid valve
2) Intake manifold pressure sensor
3) Intake air temperature sensor
4) Intake air temperature and pressure sensor
5) Engine coolant temperature sensor (*2)
6) Ignition parts (*1)
7) Air intake system (*5)
8) Fuel injection parts (*4)
9) Throttle position sensor
10) Crankshaft position sensor (*3)
11) Camshaft position sensor (*3)
12) Oxygen sensor
13) Fuel pump and fuel pump relay
3. Engine does not return to idle.
1) Idle air control solenoid valve
2) Engine coolant temperature sensor
3) Accelerator cable (*6)
4) Throttle position sensor
5) Intake manifold pressure sensor
6) Intake air temperature sensor
7) Intake air temperature and pressure sensor
4. Poor acceleration
1) Intake manifold pressure sensor
2) Intake air temperature sensor
3) Intake air temperature and pressure sensor
4) Throttle position sensor
5) Fuel injection parts (*4)
6) Fuel pump and fuel pump relay
7) Engine coolant temperature sensor (*2)
8) Crankshaft position sensor (*3)
9) Camshaft position sensor (*3)
10) A/C switch and A/C cut relay
11) Engine torque control signal circuit
12) Ignition parts (*1)
5. Engine stalls or engine sags or hesitates at
acceleration.
1) Intake manifold pressure sensor
2) Intake air temperature sensor
3) Intake air temperature and pressure sensor
4) Engine coolant temperature sensor (*2)
5) Crankshaft position sensor (*3)
6) Camshaft position sensor (*3)
7) Purge control solenoid valve
8) Fuel injection parts (*4)
9) Throttle position sensor
10) Fuel pump and fuel pump relay
EN(H4SO)-305
ENGINE (DIAGNOSTICS)
GENERAL DIAGNOSTIC TABLE
*1: Check ignition coil & 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.
*6: Adjust accelerator cable.
2. AUTOMATIC TRANSMISSION
NOTE:
Check general diagnostics table with non-conformity symptom for automatic transmission. <Ref. to AT-2,
Basic Diagnostic Procedure.>
6. Surge
1) Intake manifold pressure sensor
2) Intake air temperature sensor
3) Intake air temperature and pressure sensor
4) Engine coolant temperature sensor (*2)
5) Crankshaft position sensor (*3)
6) Camshaft position sensor (*3)
7) Fuel injection parts (*4)
8) Throttle position sensor
9) Fuel pump and fuel pump relay
7. Spark knock
1) Intake manifold pressure sensor
2) Intake air temperature sensor
3) Intake air temperature and pressure sensor
4) Engine coolant temperature sensor
5) Knock sensor
6) Fuel injection parts (*4)
7) Fuel pump and fuel pump relay
8. After burning in exhaust system
1) Intake manifold pressure sensor
2) Intake air temperature sensor
3) Intake air temperature and pressure sensor
4) Engine coolant temperature sensor (*2)
5) Fuel injection parts (*4)
6) Fuel pump and fuel pump relay
Symptom
Problem parts
EN(H4SO)-306
ENGINE (DIAGNOSTICS)
GENERAL DIAGNOSTIC TABLE
MEMO:
FUEL INJECTION (FUEL SYSTEMS)
FU(H4SOw/oOBD)
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Throttle Body . . . . . . . . . . . . . . . . . . . . . . . .13
Intake Manifold. . . . . . . . . . . . . . . . . . . . . . ..14
Engine Coolant Temperature Sensor. . . . . . . . . . . . . . 26
Crankshaft Position Sensor. . . . . . . . . . . . . . . . . ...27
Camshaft Position Sensor. . . . . . . . . . . . . . . . . . .28
Knock Sensor. . . . . . . . . . . . . . . . . . . . . . . 29
Throttle Position Sensor. . . . . . . . . . . . . . . . . . . 30
Intake Air Temperature and Pressure Sensor. . . . . . . . . . ...32
Idle Air Control Solenoid Valve . . . . . . . . . . . . . . . . .33
Fuel Injector . . . . . . . . . . . . . . . . . . . . . . . ..34
Oxygen Sensor . . . . . . . . . . . . . . . . . . . . . . .40
Engine Control Module. . . . . . . . . . . . . . . . . . . ..42
Main Relay . . . . . . . . . . . . . . . . . . . . . . . . 43
Fuel Pump Relay. . . . . . . . . . . . . . . . . . . . . ...44
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . ...45
Fuel Tank . . . . . . . . . . . . . . . . . . . . . . . . ..48
Fuel Filler Pipe . . . . . . . . . . . . . . . . . . . . . . ..55
Fuel Pump. . . . . . . . . . . . . . . . . . . . . . . . .59
Fuel Level Sensor . . . . . . . . . . . . . . . . . . . . . .61
Fuel Sub Level Sensor . . . . . . . . . . . . . . . . . . . ..62
Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . ..64
Fuel Cut Valve. . . . . . . . . . . . . . . . . . . . . . ...65
Fuel Damper Valve . . . . . . . . . . . . . . . . . . . . ...66
Fuel Delivery, Return and Evaporation Lines. . . . . . . . . . . 67
Fuel System Trouble in General . . . . . . . . . . . . . . . ...70
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