Subaru LEGACY 2006 Manual page 154

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of intake air temperature
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 INTAKE AIR
TEMPERATURE SENSOR AND ECM CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from intake air
temperature sensor.
3) Turn the ignition switch to ON.
4) Read the data of intake air temperature
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 intake air temperature
above 120°C (248°F) ?
Is the intake air temperature
less than –40°C (–40°F) ?
EN(H4SO)(diag)-117
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Repair the poor
contact.
NOTE:
In this case, repair
the following item:
• Poor contact in
intake air tempera-
ture sensor
• Poor contact in
ECM
• Poor contact of
coupling connector
• Poor contact of
joint connector
Replace the intake Repair the ground
air temperature short circuit of har-
sensor. <Ref. to ness between
FU(H4SO)-25, intake air tempera-
Mass Air Flow and ture sensor and
Intake Air Temper- ECM connector.
ature Sensor.>