Subaru IMPREZA GD 2007 Series Manual page 1471

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
5 CHECK ENGINE COOLANT TEMPERATURE
SENSOR.
1) Start the engine and warm-up completely.
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 procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
6 CHECK MASS AIR FLOW AND INTAKE AIR
TEMPERATURE SENSOR.
1) Start the engine and warm-up engine until
coolant temperature is higher than 75°C (167°F).
2) Place the shift lever in neutral position.
3) Turn the A/C switch to OFF.
4) Turn all the accessory switches to OFF.
5) Read the data of mass air flow and intake air
temperature sensor signal using Subaru Select
Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
7 CHECK MASS AIR FLOW AND INTAKE AIR
TEMPERATURE SENSOR.
1) Start the engine and warm-up engine until
coolant temperature is higher than 75°C (167°F).
2) Place the shift lever in neutral position for
MT model.
3) Turn the A/C switch to OFF.
4) Turn all the accessory switches to OFF.
5) Open the front hood.
6) Measure the ambient temperature.
7) Read the data of mass air flow and intake air
temperature sensor signal using Subaru Select
Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Check
Is the engine coolant tempera-
ture 75°C (167°F) or higher?
Is the measured value 2.0 —
5.0 g/s (0.26 — 0.66 lb/m)?
Subtract ambient temperature
from intake air temperature. Is
the obtained value –10 — 50°C
(–18 — 90°F)?
EN(STI)(diag)-140
Yes No
Go to step 6. Replace the
engine coolant
temperature sen-
sor. <Ref. to
FU(H4DOTC)-30,
Engine Coolant
Temperature Sen-
sor.>
Go to step 7.
Replace the mass
air flow and intake
air temperature
sensor. <Ref. to
FU(H4DOTC)-35,
Mass Air Flow and
Intake Air Temper-
ature Sensor.>
Repair poor con- Check the mass air
tact of the ECM flow and intake air
connector. temperature sen-
sor.
<Ref. to
FU(H4DOTC)-35,
Mass Air Flow and
Intake Air Temper-
ature Sensor.>