Read Diagnostic Trouble Code (Dtc) - Subaru 2004 LEGACY Service Manual

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
16 CHECK MISFIRE SYMPTOM.
1) Turn the ignition switch to ON.
2) READ DTC.
<Ref. to EN(H6DO)(diag)-32, Read Diagnostic
Trouble Code (DTC).>
17 CHECK ANY OTHER DTC ON DISPLAY.
18 CHECK DTC ON DISPLAY.
19 CHECK DTC ON DISPLAY.
20 CHECK DTC ON DISPLAY.
21 CHECK DTC ON DISPLAY.
22 ONLY ONE CYLINDER.
23 GROUP OF #1 AND #2 CYLINDERS.
Check
Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate a DTC?
Is DTC P0301 and P0302 dis-
played?
Is DTC P0303 and P0304 dis-
played?
Is DTC P0305 and P0306 dis-
played?
Is DTC P0301, P0303 and
P0305 displayed?
Is DTC P0302, P0304 and
P0306 displayed?
Is there any fault in that cylin-
der?
Is there any fault in #1 and #2
cylinders?
EN(H6DO)(diag)-182
Yes
Go to step 22. Go to step 17.
Go to step 23. Go to step 18.
Go to step 24. Go to step 19.
Go to step 25. Go to step 20.
Go to step 26. Go to step 21.
Go to step 27. Go to step 28.
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)-
• Compression
66, List of Diag-
ratio
nostic Trouble
Code (DTC).>
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 #1 and #2
cylinders side.
<Ref. to
EN(H6DO)(diag)-
59, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Start-
ing Failure.>
No