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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostics) (P0700 To P2097) (H4DOTC) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P1531 Battery Current Sensor Circuit High >> Notes

DTC P1531 Battery Current Sensor Circuit High: Notes

DTC detecting condition: 

Immediately at fault recognition

CAUTION:

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

Fig 1: Battery Current Sensor Circuit High - Wiring Diagram
G10410041Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK CURRENT DATA. 
    1. Start the engine.
    2. Read the value of Battery current value using the Subaru Select Monitor.
    NOTE: For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor .

    Is the value of battery current value -100 A or less?

    • Yes  : Go to 2. 
    • No  : Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis.
    NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
  2. CHECK HARNESS BETWEEN ECM AND BATTERY CURRENT & TEMPERATURE SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the battery current & temperature sensor.
    3. Start the engine.
    4. Read the value of Battery current value using the Subaru Select Monitor.
    NOTE: For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor .

    Is the value of battery current value -100 A or less?

    • Yes  : Repair the short circuit to power supply in harness between ECM and battery current & temperature sensor connector.
    • No  : Go to 3. 
  3. CHECK HARNESS BETWEEN ECM AND BATTERY CURRENT & TEMPERATURE SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Measure the resistance of harness between battery current & temperature sensor connector and engine ground.

      Connector & terminal 

      (B472) No. 4 - Engine ground:

      Is the resistance less than 5 Ω?

      • Yes  : Go to 4. 
      • No  : repair the harness and connector.
      NOTE: In this case, repair the following item:
      • Open circuit in harness between ECM and battery current & temperature sensor connector
      • Poor contact of joint connector
  4. CHECK FOR POOR CONTACT. 

    Check for poor contact of battery current & temperature sensor connector.

    Is there poor contact of battery current & temperature sensor connector?

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