1.CHECK CURRENT DATA.
2) Read the data of oil temperature sensor signal using Subaru Select Monitor.
NOTE:
For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”. 
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Is the oil temperature less than −40°C (−40°F)?
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Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the fault condition, and reperform the check.
NOTE:
In this case, there may be a temporary connector contact failure.
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2.CHECK FOR POOR CONTACT.
Check for poor contact of the ECM and oil temperature sensor connector.
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Is there poor contact in the ECM or oil temperature sensor connector?
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Repair the poor contact in the ECM or the oil temperature sensor connector.
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3.CHECK HARNESS BETWEEN ECM AND OIL TEMPERATURE SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM and oil temperature sensor.
3) Measure the resistance of the harness between the ECM and oil temperature sensor connector.
Connector & terminal
(B134) No. 23 — (E75) No. 2:
(B134) No. 29 — (E75) No. 1:
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Is the resistance less than 1 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit in harness between ECM and oil temperature sensor connector
• Poor contact of coupling connector
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4.CHECK HARNESS BETWEEN ECM AND OIL TEMPERATURE SENSOR CONNECTOR.
1) Connect all connectors.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM and chassis ground.
Connector & terminal
(B134) No. 23 (+) — Chassis ground (−):
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Is the voltage 5 V or more?
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Repair the short circuit to power supply in the harness between the ECM and oil temperature sensor connector.
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Replace the oil temperature sensor.
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