Subaru 2002 Impreza - Page 404

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Check
Are there faults in #2 and #4
cylinders?
Is the engine idle rough?
Step
GROUP
OF #2 AND #4 CYLINDERS
!5
Yes
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
Spark plugs
Fuel injectors
Compression
ratio
Skipping timing
belt teeth
Go to DTC PO171
and P0172. <Ref.
to EN(D0HC
TURBO)-152,
DTC PO171
-
FUEL TRIM MAL-
FUNCTION (NF
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
TOO LEAN)
-,
!6 CYLINDER AT RANDOM
No
Go to DTC PO171
and P0172. <Ref.
to EN(D0HC
TURBO)-1
52,
DTC PO171 -
FUEL TRIM MAL-
FUNCTION (NF
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
Repair or replace
faulty parts.
NOTE:
Check the follow.
ing items.
Spark plugs
Fuel injectors
Compression
ratio
TOO LEAN)
-,
EN(D0HC TURBO)-I80