Subaru Impreza 2003 Service Manual page 1477

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK EXHAUST SYSTEM.
Check the exhaust system parts.
NOTE:
Check the following items.
•Loose installation of exhaust manifold
•Cracks or hole of exhaust manifold
•Loose installation of front oxygen (A/F) sensor
Check
Is any other DTC displayed?
Is there a fault in exhaust sys-
tem?
EN(H4DOTC)-301
ENGINE (DIAGNOSTICS)
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4DOTC)-75,
List of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P1544.
Repair or replace Contact your Sub-
the failure, then aru distributor ser-
replace precata- vice.
lytic converter.
NOTE:
Inspection by DTM
is required,
cause
cause is deteriora-
tion of
parts.
No
be-
probable
multiple