Subaru IMPREZA GD 2007 Series Manual page 1682

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
2 CHECK CURRENT DATA.
1) Turn the ignition switch to ON (engine OFF).
2) Using the Subaru Select Monitor, read sec-
ondary air piping pressure, intake pipe absolute
pressure and atmospheric pressure, and com-
pare with the actual atmospheric pressure.
NOTE:
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(STI)(diag)-33, Subaru Select Monitor.>
Check
Is the actual difference with
atmospheric pressure 200
mmHg (27 kPa, 8 inHg, 3.9
psig) or more?
EN(STI)(diag)-351
ENGINE (DIAGNOSTICS)
Yes No
Check the appro- Go to step 2.
priate DTC using
the "List of Diag-
nostic Trouble
Code (DTC)". <Ref.
to EN(STI)(diag)-
71, List of Diagnos-
tic Trouble Code
(DTC).>
Replace the sec- Even if the malfunc-
ondary air combi- tion indicator light
nation valve LH. illuminates, the cir-
<Ref. to cuit has returned to
EC(H4DOTC)-10, a normal condition
Secondary Air at this time. Repro-
Combination duce the fault con-
Valve.> dition, and
reperform the
check.
NOTE:
In this case, there
may be a tempo-
rary connector
contact failure.