Subaru FORESTER 2001 Service Manual page 198

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK EXHAUST SYSTEM.
Check for gas leaks or air suction caused by
loose or dislocated nuts and bolts, and open
hole at exhaust pipes.
NOTE:
Check the following positions.
¼ Between cylinder head and front exhaust
pipe
¼ Between front exhaust pipe and front cata-
lytic converter
¼ Between front catalytic converter and rear
catalytic converter
3 CHECK REAR CATALYTIC CONVERTER.
Separate rear catalytic converter from rear
exhaust pipe.
4 CHECK FRONT CATALYTIC CONVERTER.
Remove front catalytic converter.
Step
Does the Subaru Select
Monitor or OBD-II general
scan tool indicate DTC
P0031, P0032, P0131,
P0132, P0133, P1130,
P1131, P1134, P1139,
P0037, P0038, P0136 and
P0139?
Is there a fault in exhaust
system?
Is there damage at rear
face of rear catalyst?
Is there damage at rear
face or front face of front
catalyst?
EN(DOHC TURBO)-197
Check Yes
Inspect the rel-
evant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(DOHC
TURBO)-82, List
of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0420.
Repair or replace
exhaust system.
<Ref. to
EX(DOHC
TURBO)-2, Gen-
eral Description.>
Replace front
catalytic converter
<Ref. to
EC(DOHC
TURBO)-3, Front
Catalytic Con-
verter.> and rear
catalytic con-
verter. <Ref. to
EC(DOHC
TURBO)-4, Rear
Catalytic Con-
verter.>
Replace front
catalytic con-
verter. <Ref. to
EC(DOHC
TURBO)-3, Front
Catalytic Con-
verter.>
Engine (Diagnostics)
No
Go to step 2.
Go to step 3.
Go to step 4.
Contact your
Subaru distributor.
NOTE:
Inspection by
DTM is required,
because probable
cause is deterio-
ration of multiple
parts.