Subaru 2004 LEGACY Service Manual page 114

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
24 GROUP OF #3 AND #4 CYLINDERS.
25 GROUP OF #5 AND #6 CYLINDERS.
26 GROUP OF #1, #3 AND #5 CYLINDERS.
Check
Is there any fault in #3 and #4
cylinders?
Is there any fault in #5 and #6
cylinder?
Is there any fault in #1, #3 and
#5 cylinders?
EN(H6DO)(diag)-183
ENGINE (DIAGNOSTICS)
Yes
Repair or replace Inspect the DTC
the faulty part. P0171, P0172,
P0174 or P0175
NOTE:
using "List of Diag-
• Check the fol-
nostic Trouble
lowing items:
Code (DTC)".
• Spark plug
<Ref. to
• Fuel injector
EN(H6DO)(diag)-
• Ignition coil
66, List of Diag-
• If no abnormal is
nostic Trouble
discovered, check
Code (DTC).>
for "IGNITION
CONTROL SYS-
TEM" of #3 and #4
cylinders side.
<Ref. to
EN(H6DO)(diag)-
59, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Start-
ing Failure.>
Repair or replace Inspect the DTC
the faulty part. P0171, P0172,
P0174 or P0175
NOTE:
using "List of Diag-
• Check the fol-
nostic Trouble
lowing items:
Code (DTC)".
• Spark plug
<Ref. to
• Fuel injector
EN(H6DO)(diag)-
• Ignition coil
66, List of Diag-
• Compres-
nostic Trouble
sion ratio
Code (DTC).>
• If no abnormal is
discovered, check
for "IGNITION
CONTROL SYS-
TEM" of #5 and #6
cylinders side.
<Ref. to
EN(H6DO)(diag)-
59, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Start-
ing Failure.>
Repair or replace Inspect the DTC
the faulty part. P0171, P0172,
P0174 or P0175
NOTE:
using "List of Diag-
Check the follow-
nostic Trouble
ing items:
Code (DTC)".
• Spark plug
<Ref. to
• Fuel injector
EN(H6DO)(diag)-
• Skipping timing
66, List of Diag-
chain teeth
nostic Trouble
Code (DTC).>
No