Subaru IMPREZA GD 2007 Series Manual page 1486

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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?
Check
EN(STI)(diag)-155
ENGINE (DIAGNOSTICS)
Yes No
Check the appro- Replace the waste-
priate DTC using gate control sole-
the "List of Diag- noid valve. <Ref. to
nostic Trouble FU(H4DOTC)-45,
Code (DTC)". Wastegate Control
<Ref. to Solenoid Valve.>
EN(STI)(diag)-71,
List of Diagnostic
Trouble Code
(DTC).>