Nissan Maxima. Manual - part 483

EC-416

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1550 BATTERY CURRENT SENSOR

2. Reconnect harness connectors disconnected.

3. Disconnect battery negative cable (1).

4. Install jumper cable (A) between battery negative terminal and

body ground.

5. Turn ignition switch ON.

6. Check the voltage between ECM harness connector terminals

under the following conditions.

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

PG-2, "How to Handle Battery"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace battery negative cable assembly.

: Vehicle front

: To body ground

ALBIA0610ZZ

ECM

Voltage (V)

Connector

+

–

Terminal

Terminal

F13

42

(Battery current 

sensor signal)

44

(Sensor ground)

Approx. 2.5

JMBIA1879ZZ

P1551, P1552 BATTERY CURRENT SENSOR

EC-417

< DTC/CIRCUIT DIAGNOSIS >

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P1551, P1552 BATTERY CURRENT SENSOR

Description

INFOID:0000000010095110

The power generation voltage variable control enables fuel consumption to be decreased by reducing the

engine load which is caused by the power generation of the generator. The battery current sensor is installed

to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the bat-

tery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is

performed. When performing the power generation voltage variable control, ECM calculates the target power

generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation

command value to IPDM E/R. For the details of the power generation voltage variable control, refer to 

CHG-8,

"System Description"

.

CAUTION:

Never connect the electrical component or the ground wire directly to the battery terminal. The con-

nection causes the malfunction of the power generation voltage variable control, and then the battery

discharge may occur.

DTC Logic

INFOID:0000000010095111

DTC DETECTION LOGIC

NOTE:

If DTC P1551 or P1552 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

Refer to 

EC-394, "DTC 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

>> Go to 

EC-417, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010095112

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in 

GI-44, "Circuit Inspection"

.

Is the inspection result normal?

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1551

Battery current sensor circuit 
low input

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

• Harness or connectors

(The sensor circuit is open or shorted.)

• Battery current sensor

P1552

Battery current sensor circuit 
high input

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

EC-418

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1551, P1552 BATTERY CURRENT SENSOR

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT

1. Disconnect battery current sensor harness connector.

2. Turn ignition switch ON.

3. Check the voltage between battery current sensor harness con-

nector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair open circuit, short to ground or short to power in

harness or connectors.

3.

CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

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 ground and short to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair open circuit, short to ground or short to power in harness or connectors.

4.

CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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

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

YES

>> GO TO 5.

NO

>> Repair open circuit, short to ground or short to power in harness or connectors.

5.

CHECK BATTERY CURRENT SENSOR

Refer to 

EC-425, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace battery negative cable assembly.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> INSPECTION END

Battery current sensor

Ground

Voltage (V)

Connector

Terminal

F5

1

Ground

Approx. 5

JMBIA1602ZZ

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F5

2

F13

44

Existed

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F5

3

F13

42

Existed

P1551, P1552 BATTERY CURRENT SENSOR

EC-419

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Component Inspection

INFOID:0000000010095113

1.

CHECK BATTERY CURRENT SENSOR

1. Turn ignition switch OFF.

2. Reconnect harness connectors disconnected.

3. Disconnect battery negative cable (1).

4. Install jumper cable (A) between battery negative terminal and

body ground.

5. Turn ignition switch ON.

6. Check the voltage between ECM harness connector terminals

under the following conditions.

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

PG-2, "How to Handle Battery"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace battery negative cable assembly.

: Vehicle front

: To body ground

ALBIA0610ZZ

ECM

Voltage (V)

Connector

+

–

Terminal

Terminal

F13

42

(Battery current 

sensor signal)

44

(Sensor ground)

Approx. 2.5

JMBIA1879ZZ