Subaru LEGACY 2006 Manual page 203

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
1) Disconnect the ECM connector and oil tem-
perature sensor connector.
2) Measure the resistance of harness
between oil temperature sensor connector and
engine ground.
Connector & terminal
(B134) No. 23 — Engine ground:
(B134) No. 29 — Engine ground:
2 CHECK POOR CONTACT.
Check poor contact of oil temperature sensor
connector.
Check
Is the resistance more than 1
MΩ?
Is there poor contact in oil tem-
perature sensor connector?
EN(H4SO)(diag)-166
Yes No
Go to step 2. Repair the ground
short circuit
between ECM and
oil temperature
sensor connector.
Repair the poor Replace the oil
contact. temperature sen-
sor. <Ref. to
FU(H4SO)-31, Oil
Temperature Sen-
sor.>