Subaru LEGACY 2006 Manual page 175

asieps_tobira.book 138 ページ ２００９年１０月２６日 月曜日 午前９時１６分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK FRONT OXYGEN (A/F) SENSOR
CONNECTOR AND COUPLING CONNEC-
TOR.
2 CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ignition switch to ON.
2) Disconnect the connector from front oxygen
(A/F) sensor.
3) Measure the voltage of harness between
ECM connector and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground (–):
(B135) No. 8 (+) — Chassis ground (–):
Check
Does water enter the connec-
tor?
Is the voltage more than 8 V?
EN(H4SO)(diag)-138
Yes No
Dry the water thor- Go to step 2.
oughly.
Replace the front Repair the battery
oxygen (A/F) sen- short circuit of har-
sor. <Ref. to ness between
FU(H4SO)-32, ECM and front
Front Oxygen (A/ oxygen (A/F) sen-
F) Sensor.> sor connector.