Subaru IMPREZA 2004 Service Manual page 73
Engine section 1
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Also See for IMPREZA 2004:
- Service manual (796 pages) ,
- Owner's manual (491 pages) ,
- Quick reference manual (46 pages)
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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
22
GROUP OF #1 AND #2 CYLINDERS
23
GROUP OF #3 AND #4 CYLINDERS
24
GROUP OF #1 AND #3 CYLINDERS
Check
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(H4SO)(diag)-150
Yes
Repair or replace
Go to DTC P0171.
faulty parts.
<Ref. to
EN(H4SO)(diag)-
NOTE:
141, DTC P0171
• Check the fol-
SYSTEM TOO
lowing items.
LEAN (BANK 1),
• Spark plugs
Diagnostic Proce-
• Fuel injectors
dure with Diagnos-
• Ignition coil
tic Trouble Code
• Compres-
(DTC).>
sion ratio
• If no abnormal is
discovered, check
for "IGNITION
CONTROL SYS-
TEM" of #1 and #2
cylinders side.
<Ref. to
EN(H4SO)(diag)-
66, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Start-
ing Failure.>
Repair or replace
Go to DTC P0171.
faulty parts.
<Ref. to
EN(H4SO)(diag)-
NOTE:
141, DTC P0171
• Check the fol-
SYSTEM TOO
lowing items.
LEAN (BANK 1),
• Spark plugs
Diagnostic Proce-
• Fuel injectors
dure with Diagnos-
• Ignition coil
tic Trouble Code
• If no abnormal is
(DTC).>
discovered, check
for "16. D: IGNI-
TION CONTROL
SYSTEM" of #3
and #4 cylinders
side. <Ref. to
EN(H4SO)(diag)-
66, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Start-
ing Failure.>
Repair or replace
Go to DTC P0171.
faulty parts.
<Ref. to
EN(H4SO)(diag)-
NOTE:
141, DTC P0171
Check the follow-
SYSTEM TOO
ing items.
LEAN (BANK 1),
• Spark plugs
Diagnostic Proce-
• Fuel injectors
dure with Diagnos-
• Skipping timing
tic Trouble Code
belt teeth
(DTC).>
No
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