General Diagnostic Table - Subaru Legacy 2002 Service Manual

Symptom
5. Rough idling
6. Hard to drive at constant speed
7. Poor acceleration/deceleration
8. Poor return to idling
9. Back fire
10. Knocking
11. Excessive fuel consumption
12. Shocks while driving
13. Poor engine revving

GENERAL DIAGNOSTIC TABLE

1) Spark plug
2) Pressure sensor
3) Engine coolant temperature sensor
4) Pressure regulator
5) Idle air control solenoid valve
6) Air leak in air intake system
7) ECM power supply
8) Throttle position sensor
9) Camshaft position sensor
10) Crankshaft position sensor
11) Oxygen sensor
12) Fuel pump
13) Fuel injector
14) Test mode or read memory connectors are con-
nected.
15) Intake air temperature sensor
1) Pressure regulator
2) Fuel injector
3) Pressure sensor
4) Engine coolant temperature sensor
5) Throttle position sensor
6) Fuel pump
1) Spark plug
2) Throttle position sensor
3) Ignition coil
4) Fuel pump
5) Pressure regulator
6) Fuel injector
7) Pressure sensor
8) Engine coolant temperature sensor
9) Idle air control solenoid valve
10) Knock sensor
1) Accelerator cable is out of adjustment
2) Throttle position sensor
3) Idle air control solenoid valve
4) Pressure sensor
5) Engine coolant temperature sensor
1) Spark plug
2) Fuel injector
3) Ignition coil and ignitor
4) Fuel pump
5) Pressure regulator
1) Pressure sensor
2) Fuel pump
3) Knock sensor
4) Pressure regulator
5) Engine coolant temperature sensor
1) Pressure sensor
2) Pressure regulator
1) Pressure regulator
2) ECM power supply
3) Throttle position sensor
1) Pressure regulator
2) Pressure sensor
3) Engine coolant temperature sensor
4) Throttle sensor
5) Fuel pump
EN(w/oOBD)-113
Problem parts
Engine (Diagnostics)
Priority
A
B
B
B
B
B
C
C
C
C
C
C
C
C
C
A
B
C
C
C
C
A
B
B
B
B
B
C
C
C
C
A
B
B
C
C
A
B
C
C
C
A
B
B
B
C
A
B
A
B
B
A
B
B
B
B