Subaru Legacy 2002 Service Manual page 643

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Engine (Diagnostics)
No.
4 CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
Measure voltage between engine coolant tem-
perature sensor connector and engine
ground.
Connector & terminal
(E8) No. 1 (+) — Engine ground (−):
5 CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Measure resistance of harness between
engine coolant temperature sensor connector
and engine ground.
Connector & terminal
(E8) No. 2 — Engine ground:
Step
Is the voltage more than 4
V?
Is the resistance less than
5 Ω?
EN-126
Check Yes
Go to step 5.
Replace engine
coolant tempera-
ture sensor. <Ref.
to FU-29, Engine
Coolant Tempera-
ture Sensor.>
No
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and engine
coolant tempera-
ture sensor con-
nector
¼ Poor contact in
engine coolant
temperature sen-
sor connector
¼ Poor contact in
ECM connector
¼ Poor contact in
coupling connec-
tor (B21)
¼ Poor contact in
joint connector
(B83)
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and engine
coolant tempera-
ture sensor con-
nector
¼ Poor contact in
engine coolant
temperature sen-
sor connector
¼ Poor contact in
ECM connector
¼ Poor contact in
coupling connec-
tor (B21)
¼ Poor contact in
joint connector
(B83)