Subaru IMPREZA 2002 Service Manual page 467

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Check
Step
CHECK HARNESS BETWEEN ECM AND
TOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from ECM and
front oxygen (NF) sensor connector.
3)Measure the resistance of harness between
ECM and front oxygen (NF) sensor connector.
FRONT OXYGEN (NF) SENSOR CONNEC-
Connector
&
terminal
(8136) NO. 6
-
(€24) NO. 3:
(6136) NO. 7
-
(E24)
NO.
4:
(8136) NO. 19
-
(€24) NO. 1:
(8136) NO. 20
-
(€24)
NO.
6:
Yes
!
CHECK POOR CONTACT.
Check poor contact in front oxygen (NF) sen-
sor connector.
s the resistance less than
1
2?
\Go to step 2.
s there poor contact in front
ixygen (NF) sensor connec-
:or?
fiepair poor con-
tact in front oxygen
(NF) sensor con-
nector.
No
Repair harness
and connector.
NOTE:
In this case, repaii
the following:
b
Open circuit in
harness between
ECM and front
oxygen (NF) sen-
sor connector
8
Poor contact in
front oxygen (NF)
sensor connector
8
Poor contact in
ECM connector
Replace the front
oxygen ( N F ) sen-
sor. <Ref. to
Front Oxygen
(A/
F) Sensor.>
FU(S0HC)-43,
EN(S0HC)-143