Subaru Legacy 2002 Service Manual page 1412

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK HARNESS BETWEEN KNOCK
SENSOR 1 AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance between ECM harness
connector and chassis ground.
Connector & terminal
(B135) No. 4 — Chassis ground:
2 CHECK KNOCK SENSOR 1 (RH).
1) Disconnect connector from knock sensor 1
(RH).
2) Measure resistance between knock sensor
connector terminal and engine ground.
Terminal
No. 2 — Engine ground:
3 CHECK CONDITION OF KNOCK SENSOR 1
(RH) INSTALLATION.
Step
Is the resistance more than
700 kΩ?
Is the resistance more than
700 kΩ?
Is the knock sensor 1 (RH)
installation bolt tightened
securely?
EN(H6)-205
Check Yes
Go to step 2.
Go to step 3.
Replace knock
sensor 1 (RH).
<Ref. to FU(H6)-
32, Knock Sen-
sor.>
Engine (DIAGNOSTICS)
No
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
knock sensor 1
(RH) and ECM
connector
¼ Poor contact in
knock sensor 1
(RH) connector
¼ Poor contact in
coupling connec-
tor
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
knock sensor 1
(RH) and ECM
connector
¼ Poor contact in
knock sensor 1
(RH) connector
¼ Poor contact in
coupling connec-
tor
Tighten knock
sensor 1 (RH)
installation bolt
securely.