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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
7
CHECK MASS AIR FLOW AND INTAKE AIR
TEMPERATURE SENSOR.
1) Start and warm-up the engine until engine
coolant temperature is above 60°C (140°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) 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 procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4DOTC)(diag)-24, Subaru Select Mon-
itor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Check
Subtract the ambient tempera-
ture from intake air tempera-
ture. Is the value from −10°C
(14°F) to 50°C (122°F)?
EN(H4DOTC)(diag)-113
ENGINE (DIAGNOSTICS)
Yes
Replace the ECM.
Check the mass
<Ref. to
air flow and intake
FU(H4DOTC)-34,
air temperature
Engine Control
sensor. <Ref. to
Module (ECM).>
FU(H4DOTC)-27,
Mass Air Flow and
Intake Air Temper-
ature Sensor.>
No
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