Subaru Legacy 2003 Service Manual page 1941

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
4 CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
Measure the voltage between engine coolant
temperature sensor connector and engine
ground.
Connector & terminal
(E8) No. 2 (+) — Engine ground ( − − − − ):
Does the measured value exceed the specified
value?
5 CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness
between engine coolant temperature sen-
sor connector and engine ground.
Connector & terminal
(E8) No. 1 — Engine ground:
Is the measured value less than the speci-
fied value?
Step
EN(H4DOSTC)-102
Value
4 V
5 Ω
Yes
Go to step 5. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and engine
coolant tempera-
ture sensor con-
nector
• Poor contact in
engine coolant
temperature sen-
sor connector
• Poor contact in
ECM connector
• Poor contact in
coupling connector
• Poor contact in
joint connector
Replace the Repair the har-
engine coolant ness and connec-
temperature sen- tor.
sor. <Ref. to
NOTE:
FU(H4DOSTC)-
In this case, repair
28, Engine Cool-
the following:
ant Temperature
• Open circuit in
Sensor.>
harness between
ECM and engine
coolant tempera-
ture sensor con-
nector
• Poor contact in
engine coolant
temperature sen-
sor connector
• Poor contact in
ECM connector
• Poor contact in
coupling connector
• Poor contact in
joint connector
No