Subaru 2004 LEGACY Service Manual page 100

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the oil tem-
perature sensor.
3) Measure the voltage between oil tempera-
ture sensor connector and engine ground.
Connector & terminal
(E75) No. 2 (+) — Engine ground (
2 CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between oil tempera-
ture sensor connector and engine ground.
Connector & terminal
(E75) No. 2 (+) — Engine ground (
3 CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
Measure the voltage between oil temperature
sensor connector and engine ground.
Connector & terminal
(E75) No. 2 (+) — Engine ground (
4 CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness
between oil temperature sensor connector and
engine ground.
Connector & terminal
(E75) No. 1 — Engine ground:
Check
Is the voltage more than 10 V? Repair the battery
−
):
Is the voltage more than 10 V? Repair the battery
−
):
Is the voltage more than 4 V?
−
):
Is the resistance less than 5
Ω?
EN(H6DO)(diag)-169
ENGINE (DIAGNOSTICS)
Yes
Go to step 2.
short circuit in har-
ness between
ECM and oil tem-
perature sensor
connector.
Go to step 3.
short circuit in har-
ness between
ECM and oil tem-
perature sensor
connector.
Go to step 4. Repair the har-
ness and connec-
tor.
NOTE:
In this case repair
the following:
• Open circuit in
harness between
ECM and oil tem-
perature sensor
connector
• Poor contact in
oil temperature
sensor connector
• Poor contact in
ECM connector
• Poor contact in
coupling connector
Replace the oil Repair the har-
temperature sen- ness and connec-
sor. <Ref. to tor.
FU(H6DO)-29, Oil
NOTE:
Temperature Sen-
In this case repair
sor.>
the following:
• Open circuit in
harness between
ECM and oil tem-
perature sensor
connector
• Poor contact in
oil temperature
sensor connector
• Poor contact in
ECM connector
• Poor contact in
coupling connector
• Poor contact in
joint connector
No