Nissan Pathfinder (2012 year). Manual - part 347

P1550 BATTERY CURRENT SENSOR

EC-857

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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P1550 BATTERY CURRENT SENSOR

Component Description

INFOID:0000000007358756

The power generation voltage variable control enables fuel con-

sumption to be decreased by reducing the engine load which is

caused by the power generation of the generator. The battery cur-

rent sensor (1) is installed to the battery cable at the negative termi-

nal. The sensor measures the charging/discharging current of the

battery. Based on the sensor signal, ECM judges whether or not the

power generation voltage variable control is performed. When per-

forming the power generation voltage variable control, ECM calcu-

lates the target power generation voltage based on the sensor

signal. And ECM sends the calculated value as the power genera-

tion command value to IPDM E/R. For the details of the power gen-

eration voltage variable control, refer to 

CHG-12, "System

Description"

.

: Vehicle front

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.

On Board Diagnosis Logic

INFOID:0000000007358757

The MIL will not illuminate for this self-diagnosis.

NOTE:

If DTC P1550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-836, "DTC Confirmation Procedure"

.

DTC Confirmation Procedure

INFOID:0000000007358758

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next step.

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 at idle.

1. Start engine and wait at least 10 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to 

EC-857, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000007358759

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten ground screws on the body. 

ALBIA0362ZZ

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1550
1550

Battery current sensor circuit 
range/performance

The output voltage of the battery current 
sensor remains within the specified 
range while engine is running.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Battery current sensor

August 2012

2012 Pathfinder

EC-858

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P1550 BATTERY CURRENT SENSOR

Refer to 

EC-623, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT

1. Disconnect battery current sensor (1) harness connector.

2. Turn ignition switch ON.

: Vehicle front

3. Check voltage between battery current sensor terminal 1 and

ground with CONSULT or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• Harness for open or short between battery current sensor and ECM

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

4.

CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between battery current sensor terminal 2 and ECM terminal 67.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

BBIA0539E

ALBIA0362ZZ

Voltage: Approximately 5 V

PBIA9891J

Continuity should exist.

August 2012

2012 Pathfinder

P1550 BATTERY CURRENT SENSOR

EC-859

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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5.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• Harness for open or short between battery current sensor and ECM

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

6.

CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between battery current sensor terminal 3 and ECM terminal 71.

Refer to Wiring Diagram.

2. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• Harness for open or short between battery current sensor and ECM

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

8.

CHECK BATTERY CURRENT SENSOR

Refer to 

EC-859, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

>> Replace battery negative cable assembly.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358760

BATTERY CURRENT SENSOR

1. Reconnect harness connectors disconnected.
2. Disconnect battery negative cable (1).
3. Install jumper cable (A) between battery negative terminal and

body ground.

4. Turn ignition switch ON.

Continuity should exist.

ALBIA0363ZZ

August 2012

2012 Pathfinder

EC-860

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P1550 BATTERY CURRENT SENSOR

5. Check voltage between ECM terminal 71 (battery current sensor

signal) and ground.

6. If NG, replace battery negative cable assembly.

Voltage: Approximately 2.5 V

PBIB2617E

August 2012

2012 Pathfinder

P1551, P1552 BATTERY CURRENT SENSOR

EC-861

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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EC

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P1551, P1552 BATTERY CURRENT SENSOR

Component Description

INFOID:0000000007358761

The power generation voltage variable control enables fuel con-

sumption to be decreased by reducing the engine load which is

caused by the power generation of the generator. The battery cur-

rent sensor (1) is installed to the battery cable at the negative termi-

nal. The sensor measures the charging/discharging current of the

battery. Based on the sensor signal, ECM judges whether or not the

power generation voltage variable control is performed. When per-

forming the power generation voltage variable control, ECM calcu-

lates the target power generation voltage based on the sensor

signal. And ECM sends the calculated value as the power genera-

tion command value to IPDM E/R. For the details of the power gen-

eration voltage variable control, refer to 

CHG-12, "System

Description"

.

: Vehicle front

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.

On Board Diagnosis Logic

INFOID:0000000007358762

The MIL will not illuminate for these self-diagnoses.

NOTE:

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

Refer to .

EC-836, "DTC Confirmation Procedure"

DTC Confirmation Procedure

INFOID:0000000007358763

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next step.

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

1. Turn ignition switch ON.
2. Wait at least 10 seconds.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to 

EC-861, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000007358764

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten ground screws on the body. 

ALBIA0362ZZ

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1551
1551

Battery current sensor circuit 
low input

An excessively low voltage from the sensor 
is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Battery current sensor

P1552
1552

Battery current sensor circuit 
high input

An excessively high voltage from the sensor 
is sent to ECM.

August 2012

2012 Pathfinder

EC-862

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P1551, P1552 BATTERY CURRENT SENSOR

Refer to 

EC-623, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT

1. Disconnect battery current sensor (1) harness connector.

2. Turn ignition switch ON.

: Vehicle front

3. Check voltage between battery current sensor terminal 1 and

ground with CONSULT or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• Harness for open or short between battery current sensor and ECM

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

4.

CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between battery current sensor terminal 2 and ECM terminal 67.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

BBIA0539E

ALBIA0362ZZ

Voltage: Approximately 5 V

PBIA9891J

Continuity should exist.

August 2012

2012 Pathfinder

P1551, P1552 BATTERY CURRENT SENSOR

EC-863

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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EC

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O

5.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• Harness for open or short between battery current sensor and ECM

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

6.

CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between battery current sensor terminal 3 and ECM terminal 71.

Refer to Wiring Diagram.

2. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• Harness for open or short between battery current sensor and ECM

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

8.

CHECK BATTERY CURRENT SENSOR

Refer to 

EC-863, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

>> Replace battery negative cable assembly.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358765

BATTERY CURRENT SENSOR

1. Reconnect harness connectors disconnected.
2. Disconnect battery negative cable (1).
3. Install jumper cable (A) between battery negative terminal and

body ground.

4. Turn ignition switch ON.

Continuity should exist.

ALBIA0363ZZ

August 2012

2012 Pathfinder

EC-864

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P1551, P1552 BATTERY CURRENT SENSOR

5. Check voltage between ECM terminal 71 (battery current sensor

signal) and ground.

6. If NG, replace battery negative cable assembly.

Voltage: Approximately 2.5 V

PBIB2617E

August 2012

2012 Pathfinder