Subaru Legacy 2004 Service Manual page 937

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
AR:DTC P0519 IDLE CONTROL SYSTEM MALFUNCTION (FAIL-SAFE)
DTC DETECTING CONDITION:
Immediately at fault recognition.
TROUBLE SYMPTOM:
Engine keeps running at higher revolution than specified idling revolution.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO 2.5)(diag)-
41, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-34, Inspection Mode.>.
Step
1 CHECK OPTION CODE.
2 CHECK ANY OTHER DTC ON DISPLAY.
3 CHECK AIR INTAKE SYSTEM.
1) Turn the ignition switch to ON.
2) Start and idle the engine.
3) Check the following items:
• Loose installation of intake manifold and
throttle body
• Cracks of intake manifold gasket and throttle
body gasket
• Disconnections of vacuum hoses
4 CHECK ELECTRONIC THROTTLE CON-
TROL.
1) Turn the ignition switch to OFF.
2) Remove the electronic throttle control.
3) Check the electronic throttle control.
AS:DTC P0558 GENERATOR CIRCUIT LOW INPUT
CAUTION:
For diagnostic procedure, refer to DTC P0559. <Ref. to EN(H4SO 2.5)(diag)-179, DTC P0559 GENER-
ATOR CIRCUIT HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>.
Check
Is the option code EC, EK or
K4?
Is any other DTC displayed?
Is there any fault in air intake
system?
Are foreign matters found
inside the electronic throttle
control?
EN(H4SO 2.5)(diag)-178
Yes
Go to step 2. Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-66, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.
Inspect the DTC Go to step 3.
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to EN(H4SO
2.5)(diag)-70, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0519.
Repair air suction Go to step 4.
and leaks.
Remove foreign Perform the diag-
matters from the nosis of DTC
electronic throttle P2101.
control.
No