Nissan Rogue (T33) 2021-Present Service Manual: B12a4-81 Battery Current Sensor

Nissan Rogue (T33) 2021-Present Service Manual / Electrical & Power Control :: Charging System / With Idle Start/stop :: Dtc/circuit Diagnosis / B12a4-81 Battery Current Sensor

DTC Description

DTC DETECTION LOGIC

DTC No. CONSULT screen items DTC Detection Condition
(Trouble diagnosis content) [Malfunction type]
B12A4–81

BATTERY CURRENT SENSOR

(Battery current sensor) 		[INVALID SERIAL DATA RECEIVED] Diagnosis condition When ignition switch is ON.
Signal (terminal) LIN (BAT CURRENT SEN)
Threshold 12V battery current sensor and IPDM E/R cannot communicate with LIN communication signal.
Diagnosis delay time 2 seconds or more

POSSIBLE CAUSE

  • 12V battery terminal is not connected

  • Harness or connectors

  • 12V battery current sensor (With 12V battery temperature sensor)

  • IPDM E/R

FAIL-SAFE

Fix the power generation command value to 14.3 V.

DTC CONFIRMATION PROCEDURE

PERFORM COMPONENT FUNCTION CHECK

CONSULT

  1. Start engine and wait for 10 seconds or more.

  2. Select “Self diagnosis result” mode of “IPDM E/R”.

Is the inspection result normal?

YES-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

YES-2>>

Confirmation after repair: Inspection End.

NO>>

Proceed to Diagnosis Procedure.

Diagnosis Procedure

CHECK LIN COMMUNICATION SIGNAL 1

CONSULT DATA MONITOR

Select “Battery current sen value (LIN)” of “IPDM E/R” data monitor item.

Monitor item Condition Monitor status
Battery current sen value (LIN)

Engine running

  • Battery: Full charge

  • Engine Idling

 (–200.00) – (+300.00) A

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace IPDM E/R. Refer to Removal and Installation.

CHECK FUSE

  1. Ignition switch OFF.

  2. Check that the following fuse is not blown (open).

    No. Capacity
    89 10A

Is the fuse blown (open)?

YES>>

Replace the blown (open) fuse after repairing the cause of blown (open).

NO>>

GO TO 3.

CHECK 12V BATTERY CURRENT SENSOR POWER

  1. Disconnect 12V battery current sensor connector.

  2. Ignition switch ON.

  3. Check the voltage between 12V battery current sensor harness connector and ground.

    (+) (-) Voltage (V)
    12V battery current sensor
    Connector Terminal
    E37 1 Ground 12V battery voltage

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace harness.

CHECK LIN COMMUNICATION SIGNAL

  1. Ignition switch ON.

  2. Check signal between 12V battery current sensor harness connector and ground using an oscilloscope.

    (+) (−) Signal
    12V battery current sensor
    Connector Terminal
    E37 2 Ground

Is the inspection result normal?

YES>>

Repair or replace harness.

NO>>

Replace 12V battery current sensor. Refer to Removal and Installation.

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