Subaru LEGACY 2006 Manual page 159

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of engine coolant tempera-
ture sensor signal using Subaru Select Monitor
or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-26, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
2 CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the engine
coolant temperature sensor.
3) Turn the ignition switch to ON.
4) Read the data of engine coolant tempera-
ture sensor signal using Subaru Select Monitor
or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-26, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Check
Is the engine coolant tempera-
ture above 150°C (302°F) ?
Is the engine coolant tempera-
ture less than –40°C (–40°F) ?
EN(H4SO)(diag)-122
Yes No
Go to step 2. Repair the poor
contact.
NOTE:
In this case, repair
the following item:
• Poor contact of
engine coolant tem-
perature sensor
• Poor contact in
ECM
• Poor contact of
coupling connector
• Poor contact of
joint connector
Replace the Repair the ground
engine coolant short circuit of har-
temperature sen- ness between
sor. <Ref. to engine coolant
FU(H4SO)-19, temperature sen-
Engine Coolant sor and ECM con-
Temperature Sen- nector.
sor.>