1.CHECK CURRENT DATA.
2) Read the data of “Battery temperature” using the Subaru Select Monitor.
NOTE:
For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”. 
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Is the data of “Battery temperature” −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 failure, and then perform the diagnosis again.
NOTE:
In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
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2.CHECK FOR POOR CONTACT.
Check for poor contact between the ECM and battery temperature sensor connectors.
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Is there poor contact of the ECM or battery temperature sensor connectors?
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Repair any poor contact between the ECM and battery temperature sensor connectors.
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3.CHECK HARNESS BETWEEN ECM AND BATTERY TEMPERATURE SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM and battery temperature sensor.
3) Measure the resistance of the harness between the ECM and battery temperature sensor connector.
Connector & terminal
(B135) No. 36 — (B523) No. 1:
(B135) No. 12 — (B523) No. 2:
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Is the resistance less than 1 Ω?
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Repair the open circuit in the harness between the ECM and battery temperature sensor connector.
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4.CHECK HARNESS BETWEEN ECM AND BATTERY 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
(B135) No. 36 (+) — Chassis ground (−):
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Is the voltage 5 V or more?
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Repair the short circuit to power in the harness between the ECM and battery temperature sensor connector.
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Replace the battery temperature sensor.
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