Subaru IMPREZA GD 2007 Series Manual page 1526

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK EXHAUST SYSTEM.
Check for gas leaks or air suction caused by
loose or dislocated nuts and bolts, and open
hole at exhaust pipes.
NOTE:
Check the following positions.
• Between cylinder head and front exhaust pipe
• Between front exhaust pipe and front catalytic
converter
• Between front catalytic converter and rear
catalytic converter
• Loose or improperly attached front oxygen
(A/F) sensor or rear oxygen sensor
2 CHECK WAVEFORM DATA ON THE SUBA-
RU SELECT MONITOR (WHILE DRIVING).
1) Drive at a constant speed between 80 —
112 km/h (50 — 70 MPH).
2) After 5 minutes have elapsed in the condi-
tion of step 1), use the Subaru Select Monitor
while still driving to read the waveform data.
REAR OXYGEN
SENSOR
A/F LAMBDA 1
REAR OXYGEN
SENSOR
A/F LAMBDA 1
Check
Is there any fault in exhaust
system?
Is a normal waveform displayed? Even if the malfunc-
EN-04895
EN(STI)(diag)-195
ENGINE (DIAGNOSTICS)
Yes No
Repair or replace Go to step 2.
the exhaust sys-
tem. <Ref. to
EX(H4DOTC)-2,
General Descrip-
tion.>
Go to step 3.
tion indicator light
illuminates, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the fault con-
dition, and
reperform the
check.
NOTE:
In this case, there
may be a tempo-
rary connector
contact failure.