1.CHECK CURRENT DATA.
2) Read the data of “Battery current value” 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 current value” 100 A or more?
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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 HARNESS BETWEEN ECM AND BATTERY CURRENT SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM and battery current sensor.
3) Measure the resistance of the harness between the ECM and battery current sensor connector.
Connector & terminal
(B135) No. 22 — (B538) No. 3:
(B135) No. 32 — (B538) No. 1:
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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 current sensor connector.
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3.CHECK HARNESS BETWEEN ECM AND BATTERY CURRENT SENSOR CONNECTOR.
Measure the resistance between ECM and chassis ground.
Connector & terminal
(B135) No. 22 — Chassis ground:
(B135) No. 32 — Chassis ground:
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Is the resistance 1 MΩ or more?
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Repair the short circuit to ground in the harness between the ECM and battery current sensor connector.
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4.CHECK FOR POOR CONTACT.
Check for poor contact between the ECM and battery current sensor connectors.
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Is there poor contact of the ECM or battery current sensor connectors?
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Repair any poor contact between the ECM and battery current sensor connectors.
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Replace the battery current sensor.
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