Subaru IMPREZA 2002 Service Manual page 495

E
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Yes
;o to step 2.
; o
to step 3 .
Step
CHECK HARNESS BETWEEN KNOCK SEN-
SOR AND ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance between ECM har-
ness connector and chassis ground.
Connector & terminal
(8136) No. 4
-
Chassis
ground:
No
Repair harness
and connector.
NOTE:
In this case, repair
the following:
Open circuit in
harness between
knock sensor and
ECM connector
Poor contact in
knock sensor con-
nector
Poor contact in
coupling connector
(821)
Repair harness
and connector.
NOTE:
In this case, repaii
the following:
Open circuit in
harness between
knock sensor and
ECM connector
Poor contact in
knock sensor con-
nector
9
Poor contact in
coupling connector
(821
1
! CHECK KNOCK SENSOR.
1)Disconnect the connector from knock sensor.
2)Measure the resistance between knock sen-
sor connector terminal and engine ground.
Terminal
No.
2
-
Engine ground:
s
the knock sensor installation Replace the knock
)olt tightened securely? sensor. <Ref. to
FU(S0HC)-30,
Knock Sensor.>
1
CHECK CONDITION OF KNOCK SENSOR
INSTALLATION.
Tighten knock sen.
sor installation bolt
securely.
~~
Check
s
the resistance more than
'OO ka?
s
the resistance more than
7 0 0
ka?
EN(S0HC)-171