Nissan Sentra B18 (2020-2025) Service Manual / Electrical & Power Control / Charging System :: Dtc/circuit Diagnosis / B20bd-12 Battery Current Sensor

Nissan Sentra B18 (2020-2025) Service Manual: B20bd-12 Battery Current Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
B20BD–12	BATTERY CURRENT SENSOR (SHORT TO BATTERY)	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	Battery current sensor signal
		Threshold	Battery current sensor circuit is shorted to battery.
		Diagnosis delay time	10 seconds or more.

POSSIBLE CAUSE

Harness or connectors
- Battery current sensor input signal (current) circuit is shorted (Power)
Battery current sensor

FAIL-SAFE

—

Confirmation Procedure

PERFORM COMPONENT FUNCTION CHECK
1. CONSULT
  1. Start engine and wait for 10 seconds or more.
  2. Select “Self Diagnostic Result” mode of “IPDM E/R”.
Is the inspection result normal?
YES>>
To check malfunction symptom before repair: Refer to Intermittent Incident.
YES>>
Confirmation after repair: Inspection End.
NO>>
Refer to DTC Diagnosis Procedure.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK BATTERY CURRENT INPUT SIGNAL CIRCUIT

Ignition switch OFF.
Disconnect battery current sensor connector.

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

(+)	(-)	Voltage (Approx.)
E39	1	Ground	0 V

(+)

(-)

Voltage

(Approx.)

Battery current sensor

Connector

Terminal

E39

Ground

0 V

Is the inspection result normal?

YES >>

GO TO 2.

NO >>

Repair or replace harness.

CHECK BATTERY CURRENT SENSOR
1. Refer to Component Inspection.
Is the inspection result normal?
YES>>
Refer to Intermittent Incident. If the inspection result of the connector is normal then replace IPDM E/R. Refer to Removal and Installation.
NO>>
Replace battery current sensor. Refer to Removal and Installation.

Component Inspection

CHECK BATTERY CURRENT SENSOR

Ignition switch OFF.
Reconnect connector which is disconnected.
Disconnect battery negative cable.
Install jumper cable between battery negative terminal and body ground.
Ignition switch ON.

Check the voltage between IPDM E/R harness connector terminals as per the following:

IPDM E/R	Voltage (Approx.)
F98	97 (Battery current sensor signal)	96	2.5 V

IPDM E/R

Voltage

(Approx.)

Connector

Terminals

(+)

(–)

F98

(Battery current sensor signal)

2.5 V

Before measuring the terminal voltage, confirm that the battery is fully charged.

Is the inspection result normal?

YES >>

Inspection End.

NO >>

Replace battery current sensor.

 Charging System. Dtc/circuit Diagnosis

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