Subaru LEGACY 2006 Manual page 129

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK AIR INTAKE SYSTEM.
3 CHECK MANIFOLD ABSOLUTE PRESSURE
SENSOR.
1) Start the engine and warm-up engine until
coolant temperature is greater than 60°C
(140°F).
2) Place the select lever or shift lever in "P" or
"N" range.
3) Turn the A/C switch to OFF.
4) Turn all the accessory switches to OFF.
5) Read the data of intake manifold pressure
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 procedures, refer to the
"General Scan Tool Instruction Manual".
4 CHECK THROTTLE OPENING ANGLE.
Read the data of throttle position 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 procedures, refer to the
"General Scan Tool Instruction Manual".
5 CHECK THROTTLE OPENING ANGLE.
Check
Is any other DTC displayed?
Are there holes, loose bolts or
disconnection of hose on air
intake system?
Is the measured value 73.3 —
106.6 kPa (550 — 800 mmHg,
21.65 — 31.50 inHg) when the
ignition is turned ON, and 20.0
— 46.7 kPa (150 — 350
mmHg, 5.91 — 13.78 inHg)
during idling?
Is the measured value less
than 5% when throttle is fully
closed?
Is the measured value more
than 85% when throttle is fully
open?
EN(H4SO)(diag)-92
Yes No
Check DTC using Go to step 2.
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4SO)(diag)-
70, List of Diag-
nostic Trouble
Code (DTC).>
Go to step 3.
Repair the air
intake system.
Go to step 4. Replace the mani-
fold absolute pres-
sure sensor. <Ref.
to FU(H4SO)-24,
Manifold Absolute
Pressure Sensor.>
Go to step 5.
Adjust or replace
the throttle posi-
tion sensor. <Ref.
to FU(H4SO)-23,
Throttle Position
Sensor.>
Replace the mani- Replace the throt-
fold absolute pres- tle position sen-
sure sensor. <Ref. sor. <Ref. to
to FU(H4SO)-24, FU(H4SO)-23,
Manifold Absolute Throttle Position
Pressure Sensor.> Sensor.>