Subaru LEGACY 2006 Manual page 192

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
5 CHECK MASS AIR FLOW AND INTAKE AIR
TEMPERATURE SENSOR.
1) Start the engine and warm-up engine until
coolant temperature is greater than 60°C
(140°F).
2) Place the select lever in "N" or "P" 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 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.
6 CHECK MASS AIR FLOW AND INTAKE AIR
TEMPERATURE SENSOR.
1) Start the engine and warm-up engine until
coolant temperature is greater than 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(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 measured value 2.1 —
3.4 g/s (0.28 — 0.45 lb/m)?
Subtract ambient temperature
from intake air temperature. Is
the obtained value –10 — 50°C
(–18 — 90°F)?
EN(H4SO)(diag)-155
ENGINE (DIAGNOSTICS)
Yes No
Go to step 6. Replace the mass
air flow and intake
air temperature
sensor. <Ref. to
FU(H4SO)-25,
Mass Air Flow and
Intake Air Temper-
ature Sensor.>
Replace the ECM. Check the mass
<Ref. to air flow and intake
FU(H4SO)-36, air temperature
Engine Control sensor. <Ref. to
Module (ECM).> FU(H4SO)-25,
Mass Air Flow and
Intake Air Temper-
ature Sensor.>