Subaru IMPREZA 2002 Service Manual page 408

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
1
CHECK ANY OTHER DTC ON DISPLAY.
18.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Check
Does the Subaru Select Moni-
tor or OBD-ll general scan tool
indicate DTC PO031 and
PO037 at the same time?
A: DTC PO031
-
FRONT OXYGEN (NF) SENSOR HEATER CIRCUIT LOW IN-
PUT
-
DTC DETECTING CONDITION:
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(S0HC)-43, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(S0HC)-40, OPERATION, Inspec-
tion Mode.>.
WIRING DIAGRAM:
Immediately at fault recognition
Go to step 2.
A @ ECM
c@
1
Y
Go to step 5.
A:@
EN1082
Yes
I
No
EN(S0HC)-84