Subaru 2009 IMPREZA Service Manual page 649

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
2 CHECK AIR INTAKE SYSTEM.
1) Start and idle the engine.
2) Check the following items.
• Loose installation of intake manifold and
throttle body
• Cracks of intake manifold gasket and throttle
body gasket
• Disconnection of vacuum hoses
3 CHECK ELECTRONIC THROTTLE CON-
TROL.
1) Turn the ignition switch to OFF.
2) Remove the electronic throttle control.
3) Check the electronic throttle control.
Check
Is there any fault in air intake
system?
Are foreign matter found inside
electronic throttle control?
EN(H4SO)(diag)-232
Yes No
Check the appro- Go to step 2.
priate DTC using
the "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
EN(H4SO)(diag)-
86, List of Diagnos-
tic Trouble Code
(DTC).>
Repair air suction Go to step 3.
and leaks.
Remove foreign Perform the diag-
matter from elec- nosis of DTC
tronic throttle con- P2101. <Ref. to
trol. EN(H4SO)(diag)-
282, DTC P2101
THROTTLE
ACTUATOR CON-
TROL MOTOR
CIRCUIT RANGE/
PERFORMANCE,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>