Subaru IMPREZA 2002 Service Manual page 655

GENERAL DIAGNOSTIC TABLE
ENGINE (DIAGNOSTICS)
Symptom
7. Spark knock
8. After burning in exhaust system
Problem parts
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
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
*I:
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
Check general diagnostics table with non-conformity symptom for automatic transmission. <Ref. to AT-2, Ba-
sic Diagnostic Procedure.>
NOTE:
EN(S0HC)-331