Subaru Legacy 2004 Service Manual page 595

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AQ: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 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, OPER-
ATION, Inspection Mode.>.
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 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
3 CHECK ELECTRONIC THROTTLE CON-
TROL.
1) Turn the ignition switch to OFF.
2) Replace the electronic throttle control.
3) Check the electronic throttle control.
AR:DTC P0558 GENERATOR CIRCUIT LOW INPUT
CAUTION:
For diagnostic procedure, refer to DTC P0559. <Ref. to EN(H4SO 2.0)(diag)-164, DTC P0559 GENER-
ATOR CIRCUIT HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>.
Check
Is any other DTC displayed?
Is there any fault in air intake
system?
Are foreign matters found
inside the electronic throttle
control?
EN(H4SO 2.0)(diag)-163
ENGINE (DIAGNOSTICS)
Yes
Inspect the DTC Go to step 2.
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to EN(H4SO
2.0)(diag)-66, 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 3.
and leaks.
Remove foreign Perform the diag-
matters from the nosis of DTC
electronic throttle P2101.
control.
No