Subaru IMPREZA 2002 Service Manual page 448

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
I
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 sensor connector
and engine ground.
Connector & terminal
(€8) No. 2
-
Engine ground:
~
Check
Is the resistance less than 5
n?
Yes
3eplace the
mgine coolant
emperature sen-
;or. <Ref. to
Engine Coolant
Bmperature Sen-
;or.>
'U( S0HC)-27,
No
Repair harness
and connector.
NOTE:
In this case, repaii
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
(B21)
Poor contact in
joint connector
(B122)
EN(S0HC)-124