Subaru LEGACY 2006 Manual page 251

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK CURRENT DATA.
1) Turn the ignition switch to OFF.
2) Remove the fuel filler cap.
3) Install the fuel filler cap.
4) Turn the ignition switch to ON.
5) Read the data of fuel tank pressure sensor
signal using Subaru Select Monitor.
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.>
2 CHECK POWER SUPPLY TO FUEL TANK
PRESSURE SENSOR.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 22 (+) — Chassis ground (–):
3 CHECK POWER SUPPLY TO FUEL TANK
PRESSURE SENSOR.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 22 (+) — Chassis ground (–):
4 CHECK INPUT SIGNAL OF ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(B135) No. 32 (+) — Chassis ground (–):
5 CHECK INPUT SIGNAL FOR ECM (USING
SUBARU SELECT MONITOR).
Read the data of fuel tank pressure sensor sig-
nal using Subaru Select Monitor.
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.>
6 CHECK HARNESS BETWEEN ECM AND
COUPLING CONNECTOR IN REAR WIRING
HARNESS.
1) Turn the ignition switch to OFF.
2) Remove the rear seat cushion.
3) Separate rear wiring harness and fuel tank
cord.
4) Turn the ignition switch to ON.
5) Measure the voltage between the rear wir-
ing harness connector and chassis ground.
Connector & terminal
(R15) No. 7 (+) — Chassis ground (–):
Check
Is the measured value 2.8 kPa
(21.0 mmHg, 0.827 inHg) or
more?
Is the voltage more than 4.5 V? Go to step 4.
Does the voltage change by
shaking the ECM harness and
connector?
Is the voltage less than 0.2 V? Go to step 6.
Does the measured value
change by shaking the ECM
harness and connector?
Is the voltage more than 4.5 V? Go to step 7.
EN(H4SO)(diag)-214
Yes No
Go to step 11. Go to step 2.
Go to step 3.
Repair the poor Replace the ECM.
contact of ECM <Ref. to
connector. FU(H4SO)-36,
Engine Control
Module (ECM).>
Go to step 5.
Go to step 6.
Repair the poor
contact of ECM
connector.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and rear wir-
ing harness con-
nector
• Poor contact of
coupling connector