Subaru LEGACY 2006 Manual page 317

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK FRONT OXYGEN (A/F) SENSOR
CONNECTOR AND COUPLING CONNEC-
TOR.
3 CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
front oxygen (A/F) sensor connector.
3) Measure the resistance of harness
between ECM and front oxygen (A/F) sensor
connector.
Connector & terminal
(B135) No. 8 — (E22) No. 3:
(B135) No. 9 — (E22) No. 1:
4 CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B135) No. 8 — Chassis ground:
(B135) No. 9 — Chassis ground:
5 CHECK OUTPUT SIGNAL FOR ECM.
1) Connect the connector to ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B135) No. 8 (+) — Chassis ground (–):
6 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 8 (+) — Chassis ground (–):
Check
Is any other DTC displayed?
Does water enter the connec-
tor?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the voltage more than 4.5 V? Go to step 6.
Is the voltage more than 10 V? Repair the battery
EN(H4SO)(diag)-280
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).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P2097.
Dry the water thor- Go to step 3.
oughly.
Go to step 4. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and front ox-
ygen (A/F) sensor
connector
• Poor contact in
front oxygen (A/F)
sensor connector
• Poor contact in
ECM connector
Go to step 5. Repair the ground
short circuit of har-
ness between
ECM and front
oxygen (A/F) sen-
sor connector.
Go to step 7.
Repair the poor
short circuit of har- contact of ECM
ness between
connector.
ECM and front
oxygen (A/F) sen-
sor connector.
After repair,
replace the ECM.
<Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>