Subaru IMPREZA 2004 Service Manual page 71

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
12 CHECK FUEL LEVEL.
13 CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1)Clear the memory using Subaru Select Mon-
itor.
<Ref. to EN(H4SO)(diag)-47, Clear Memory
Mode.>
2)Start the engine, and drive the vehicle more
than 10 minutes.
14 CHECK CAUSE OF MISFIRE DIAGNOSED.
Check
Is the fuel meter indication
higher than the "Lower" level?
Does the malfunction indicator
light illuminate or blink?
Was the cause of misfire iden-
tified when the engine is run-
ning.
Ex. Disconnection of spark
plug cord.
EN(H4SO)(diag)-148
Yes
Go to step 13. Replenish fuel so
fuel meter indica-
tion is higher than
the "Lower" level.
After replenishing
fuel, Go to step 13.
Go to step 15. Go to step 14.
Finish diagnostics 1. Repair poor
operation, if the contact.
engine has no
NOTE:
abnormality.
In this case, repair
the following:
• Poor contact in
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
2. If there is no
poor contact,
check the follow-
ings and contact
with your Subaru
distributor service.
• Fuel condi-
tion
• Whether
addition agent
is used or not
• Plug condi-
tion
• Plug cord
condition
• Engine oil
condition
No