Subaru FORESTER 2001 Service Manual page 180

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
22 GROUP OF #1 AND #2 CYLINDERS
23 GROUP OF #3 AND #4 CYLINDERS
24 GROUP OF #1 AND #3 CYLINDERS
Step
Are there faults in #1 and
#2 cylinders?
Are there faults in #3 and
#4 cylinders?
Are there faults in #1 and
#3 cylinders?
EN(DOHC TURBO)-179
Check Yes
Repair or replace
faulty parts.
NOTE:
¼ Check the fol-
lowing items.
Spark plugs
Fuel injectors
Ignition coil
Compression ratio
¼ If no abnormal
is discovered,
check for "IGNI-
TION CONTROL
SYSTEM" of #1
and #2 cylinders
side. <Ref. to
EN(DOHC
TURBO)-72, IGNI-
TION CONTROL
SYSTEM, Diag-
nostics for Engine
Starting Failure.>
Repair or replace
faulty parts.
NOTE:
¼ Check the fol-
lowing items.
Spark plugs
Fuel injectors
Ignition coil
¼ If no abnormal
is discovered,
check for "16. D:
IGNITION CON-
TROL SYSTEM"
of #3 and #4 cyl-
inders side. <Ref.
to EN(DOHC
TURBO)-72, IGNI-
TION CONTROL
SYSTEM, Diag-
nostics for Engine
Starting Failure.>
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
¼ Spark plugs
¼ Fuel injectors
¼ Skipping timing
belt teeth
Engine (Diagnostics)
No
Go to DTC P0171
and P0172. <Ref.
to EN(DOHC
TURBO)-160,
DTC P0171 -
FUEL TRIM MAL-
FUNCTION (A/F
TOO LEAN) -,
Diagnostic Proce-
dure with Diag-
nostic Trouble
Code (DTC).>
Go to DTC P0171
and P0172. <Ref.
to EN(DOHC
TURBO)-160,
DTC P0171 -
FUEL TRIM MAL-
FUNCTION (A/F
TOO LEAN) -,
Diagnostic Proce-
dure with Diag-
nostic Trouble
Code (DTC).>
Go to DTC P0171
and P0172. <Ref.
to EN(DOHC
TURBO)-160,
DTC P0171 —
FUEL TRIM MAL-
FUNCTION (A/F
TOO LEAN) —,
Diagnostic Proce-
dure with Diag-
nostic Trouble
Code (DTC).>