Subaru 2002 IMPREZA Service Manual page 595

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
12 CHECK FUEL LEVEL.
13 CHECK STATUS OF CHECK ENGINE MAL-
FUNCTION INDICATOR LAMP (MIL).
1)Clear the memory using Subaru Select Mon-
itor.
<Ref. to EN-49, Clear Memory Mode.>
2)Start engine, and drive the vehicle more than
10 minutes.
14 CHECK CAUSE OF MISFIRE DIAGNOSED.
15 CHECK AIR INTAKE SYSTEM.
16 CHECK MISFIRE SYMPTOM.
1)Turn the ignition switch to ON.
2)Read the DTC.
•Subaru Select Monitor
<Ref. to EN-34, Subaru Select Monitor.>
•OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.
NOTE:
Perform diagnosis according to the items listed
below.
17 CHECK DIAGNOSTIC TROUBLE CODE
(DTC) ON DISPLAY.
Check
Is the fuel meter indication
higher than the "Lower" level?
Is the MIL coming on or blink-
ing?
Was the cause of misfire diag-
nosed when the engine is run-
ning?
Is there a fault in air intake sys-
tem?
Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate only one DTC?
Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P0301 and
P0302?
EN-163
ENGINE (DIAGNOSTICS)
Yes
Go to step 13. Replenish the fuel
so fuel meter indi-
cation is higher
than the "Lower"
level. After replen-
ishing fuel; Go to
step 13.
Go to step 15. Go to step 14.
Finish the diag- Repair the poor
nostics operation, contact.
if the engine has
NOTE:
no abnormality.
In this case, repair
the following:
NOTE:
Ex. Remove spark • Poor contact in
plug cord, etc. ignitor connector
• Poor contact in
ignition coil con-
nector
• Poor contact in
fuel injector con-
nector on faulty
cylinders
• Poor contact in
ECM connector
• Poor contact in
coupling connector
Repair the air Go to step 16.
intake system.
NOTE:
Check the follow-
ing items:
• Are there air
leaks or air suction
caused by loose or
dislocated nuts
and bolts?
• Are there cracks
or any disconnec-
tion of hoses?
Go to step 21. Go to step 17.
Go to step 22. Go to step 18.
No