DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
Check Yes
1)Start the engine.
2)Read the data of engine coolant temperature
sensor signal using Subaru Select Monitor or
OBD-II general scan
tool.
NOTE:
OSubaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA
FOR
ENGINE”. <Ref.
to
EN(D0HC TURBO)-38, Subaru Select Mom
itor.>
*OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-ll General Scan Tool Instruction Manual.
CHECK CURRENT DATA.
I
Is
the value less than -40°C
(-
40°F)?
I
Go to step
2.
!
CHECK HARNESS BETWEEN ENGINE
Is
the voltage more than 10
V?
No
Repair battery
Repair poor con-
tact.
NOTE:
In this case, repai
the following:
m
Poor contact in
engine coolant
temperature sen-
sor
*
Poor contact in
ECM
Poor contact in
coupling connect0
m
Poor contact in
joint connector
Go to step
3.
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from engine cool-
ant temperature sensor.
3)Measure the voltage between engine coolant
temperature sensor connector and engine
ground.
Connector
&
terminal
(E8)
No.
2
(+)
-
Engine ground
(-):
1
CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
1)Turn the ignition switch to
ON.
2)Measure the voltage between engine coolant
temperature sensor connector and engine
ground.
Connector
&
terminal
(E8)
No.
2
(+)
-
Engine ground
(-):
I
CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
Go
to step
4.
short circuit in har-
ness between
ECM and engine
coolant tempera-
ture sensor con-
nector.
Is
the voltage more than 10
V?
Repair battery
short circuit in har-
ness between
ECM and engine
coolant tempera-
ture sensor con-
nector.
Is
the voltage more than 4
V?
Go to step
5.
Repair harness
and connector.
NOTE:
In this case, repai
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
9
Poor contact in
ECM connector
Poor contact in
coupling connecta
Poor contact in
joint connector
EN(D0HC TURBO)-129
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