Nissan Sentra. Manual - part 420

EC-376

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P1550 BATTERY CURRENT SENSOR

5. Turn ignition switch ON.

6. Check the voltage between ECM harness connector terminals.

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

PG-4, "How to

Handle Battery"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace battery current sensor. Refer to 

PG-53, "Removal and Installation"

.

ECM

Voltage

(Approx.)

Connector

+

-

Terminal

F25

63

62

2.5 V

P1551, P1552 BATTERY CURRENT SENSOR

EC-377

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

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P1551, P1552 BATTERY CURRENT SENSOR

DTC Logic

INFOID:0000000009758630

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next test. 

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 8 V with ignition

switch ON

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 10 seconds.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-377, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758631

1.

CHECK BATTERY CURRENT SENSOR POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect battery current sensor harness connector.

3. Turn ignition switch ON.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK SENSOR POWER SUPPLY 2 CIRCUIT

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1551

BAT CURRENT SENSOR
(Battery current sensor)

An excessively low voltage from the sen-
sor is sent to ECM.

• Harness or connectors

(Battery current sensor circuit is open 
or shorted.)

• Battery current sensor
• Camshaft position sensor
• Camshaft (Intake)
• Starter  motor
• Starting system circuit
• Dead (Weak) battery
• Sensor power supply 1 circuit

P1552

BAT CURRENT SENSOR
(Battery current sensor)

An excessively high voltage from the sen-
sor is sent to ECM.

+

−

Voltage

(Approx.)

Battery current sensor

Connector

Terminal

F54

1

Ground

5.0 V

EC-378

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P1551, P1552 BATTERY CURRENT SENSOR

Check sensor power supply 2 circuit. Refer to 

EC-444, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

3.

CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between battery current sensor harness connector and ECM harness connector.

4. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT

1. Check the continuity between battery current sensor harness connector and ECM harness connector.

2. Also check harness for short to ground and to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts

5.

CHECK BATTERY CURRENT SENSOR

Check the battery current sensor. Refer to 

EC-378, "Component Inspection (Battery Current Sensor)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Replace battery current sensor. Refer to 

PG-53, "Removal and Installation"

.

Component Inspection (Battery Current Sensor)

INFOID:0000000009758632

1.

CHECK BATTERY CURRENT SENSOR

1. Turn ignition switch OFF.

2. Reconnect harness connectors disconnected.

3. Disconnect battery negative cable.

4. Install jumper cable between battery negative terminal and body

ground.

+

−

Continuity

Battery current sensor

ECM

Connector

Terminal

Connector

Terminal

F54

3

F25

62

Existed

+

−

Continuity

Battery current sensor

ECM

Connector

Terminal

Connector

Terminal

F54

4

F25

63

Existed

JPBIA3286ZZ

P1551, P1552 BATTERY CURRENT SENSOR

EC-379

< DTC/CIRCUIT DIAGNOSIS >

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5. Turn ignition switch ON.

6. Check the voltage between ECM harness connector terminals.

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

PG-4, "How to

Handle Battery"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace battery current sensor. Refer to 

PG-53, "Removal and Installation"

.

ECM

Voltage

(Approx.)

Connector

+

-

Terminal

F25

63

62

2.5 V