Nissan Murano Z51 (2011 year). Manual - part 18

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POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

System Diagram

INFOID:0000000006260543

System Description

INFOID:0000000006260544

By performing the power generation voltage variable control, the engine load due to the power generation of
the alternator is reduced and fuel consumption is decreased.
NOTE:
When any malfunction is detected in the power generation voltage variable control system, the power genera-
tion is performed according to the characteristic of the IC voltage regulator of the alternator.

Component Parts Location

INFOID:0000000006260545

JPMIA0632GB

1.

ECM

2.

IPDM E/R

3.

Battery current sensor

4.

Alternator

A.

Engine room dash panel (LH)

B.

Battery

C.

Cylinder block left side

JPLIA0888ZZ

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POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

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Component Description

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Component part

Description

Battery current sensor

Battery current sensor is installed to the battery cable at the neg-
ative terminal, and it detects the charging/discharging current of 
the battery and sends the voltage signal to ECM according to the 
current value.

ECM

Battery current sensor detects the charging/discharging current of 
the battery. ECM judges the battery condition based on this signal.
ECM judges whether to perform the power generation voltage 
variable control according to the battery condition.
When performing the power generation voltage variable control, 
ECM calculates the target power generation voltage according to 
the battery condition and sends the calculated value as the power 
generation command value to IPDM E/R.

IPDM E/R

IPDM E/R converts the received power generation command val-
ue into the power generation command signal (PWM signal) and 
sends it to the IC voltage regulator.

Alternator (IC voltage regulator)

IC voltage regulator controls the power generation voltage by the 
target power generation voltage based on the received power gen-
eration command signal.
When there is no power generation command signal, the alterna-
tor performs the normal power generation according to the char-
acteristic of the IC voltage regulator.

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B TERMINAL CIRCUIT

DTC/CIRCUIT DIAGNOSIS

B TERMINAL CIRCUIT

Description

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“B” terminal circuit supplies power to charge the battery and to operate the vehicle’s electrical system.

Diagnosis Procedure

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1.

CHECK “B” TERMINAL CONNECTION

1.

Turn ignition switch OFF.

2.

Check if “B” terminal is clean and tight.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair “B” terminal connection. Confirm repair by performing complete Starting/Charging system

test. Refer to Technical Service Bulletin.

2.

CHECK “B” TERMINAL CIRCUIT

Check voltage between alternator “B” terminal and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check harness for open between alternator and fusible link.

3.

CHECK “B” TERMINAL CONNECTION (VOLTAGE DROP TEST)

1.

Start engine, then engine running at idle and warm.

2.

Check voltage between battery positive terminal and alternator “B” terminal.

Is the inspection result normal?

YES

>> “B” terminal circuit is normal. Refer to 

CHG-3, "Work Flow"

.

NO

>> Check harness between battery and alternator for poor continuity.

Terminals

Voltage (Approx.)

(+)

(–)

Alternator “B” terminal

Terminal

F59

1

Ground

Battery voltage

Terminals

Voltage (Approx.)

(+)

(–)

Alternator “B” terminal

Terminal

Battery positive terminal

F59

1 

Less than 0.2 V

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L TERMINAL CIRCUIT (OPEN)

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L TERMINAL CIRCUIT (OPEN)

Description

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The “L” terminal circuit controls the charge warning lamp. The charge warning lamp illuminates when the igni-
tion switch is set to ON or START. When the alternator is providing sufficient voltage with the engine running,
the charge warning lamp will go off. If the charge warning lamp illuminates with the engine running, a malfunc-
tion is indicated.

Diagnosis Procedure

INFOID:0000000006260550

1.

CHECK “L” TERMINAL CONNECTION

1.

Turn ignition switch OFF.

2.

Check if “L” terminal is clean and tight.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair “L” terminal connection. Confirm repair by performing complete Starting/Charging system

test. Refer to Technical Service Bulletin.

2.

CHECK “L” TERMINAL CIRCUIT (OPEN)

1.

Disconnect alternator connector.

2.

Apply ground to alternator harness connector terminal.

3.

Check condition of the charge warning lamp with the ignition switch in the ON position.

Does it illuminate?

YES

>> “L” terminal circuit is normal. Refer to 

CHG-3, "Work Flow"

.

NO

>> GO TO 3.

3.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Disconnect the battery cable from the negative terminal.

2.

Disconnect the combination meter connector.

3.

Check continuity between alternator harness connector and combination meter harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair the harness or connector.

4.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Check continuity between combination meter harness connector and fuse block.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair the harness.

5.

CHECK POWER SUPPLY CIRCUIT

1.

Connect the battery cable to the negative terminal.

Alternator harness connector

Terminal

Ground

Condition

Ignition switch position

Charge warning lamp

F60

3

ON

 illuminate

Alternator harness connector

Combination meter harness connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

F60

3

M34

25

Existed

Combination meter harness connector

Fuse block

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

M34

2

M3

12C

Existed

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L TERMINAL CIRCUIT (OPEN)

2.

Check voltage between combination meter harness connector and ground.

Is the inspection result normal?

YES

>> Replace combination meter.

NO

>> Inspect the power supply circuit. Refer to 

PG-63, "Wiring Diagram - IGNITION POWER SUPPLY -

"

.

Terminals

Condition

Voltage (Approx.)

(+)

(–)

Combination meter 

harness connector

Terminal

M34

2

Ground

When the ignition switch is in 

ON position

Battery voltage

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L TERMINAL CIRCUIT (SHORT)

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L TERMINAL CIRCUIT (SHORT)

Description

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The “L” terminal circuit controls the charge warning lamp. The charge warning lamp illuminates when the igni-
tion switch is set to ON or START. When the alternator is providing sufficient voltage with the engine running,
the charge warning lamp will go off. If the charge warning lamp illuminates with the engine running, a malfunc-
tion is indicated.

Diagnosis Procedure

INFOID:0000000006260552

1.

CHECK “L” TERMINAL CIRCUIT (SHORT)

1.

Turn ignition switch OFF.

2.

Disconnect alternator connector.

3.

Turn ignition switch ON.

Does charge warning lamp illuminate?

YES

>> GO TO 2.

NO

>> Refer to 

CHG-3, "Work Flow"

.

2.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Disconnect combination meter connector.

4.

Check continuity between combination meter harness connector and ground.

Is the inspection result normal?

YES

>> Replace combination meter.

NO

>> Repair the harness.

Combination meter harness connector

Ground

Continuity

Connector No.

Terminal No.

M34

25

Not existed

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S TERMINAL CIRCUIT

S TERMINAL CIRCUIT

Description

INFOID:0000000006260553

The output voltage of the alternator is controlled by the IC voltage regulator at the “S” terminal detecting the
input voltage.
The “S” terminal circuit detects the battery voltage to adjust the alternator output voltage with the IC voltage
regulator.

Diagnosis Procedure

INFOID:0000000006260554

1.

CHECK “S” TERMINAL CONNECTION

1.

Turn ignition switch OFF.

2.

Check if “S” terminal is clean and tight.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair “S” terminal connection. Confirm repair by performing complete Starting/Charging system

test. Refer to Technical Service Bulletin.

2.

CHECK “S” TERMINAL CIRCUIT

Check voltage between alternator harness connector and ground.

Is the inspection result normal?

YES

>> Refer to 

CHG-3, "Work Flow"

.

NO

>> Check harness for open between alternator and fuse.

Terminals

Voltage (Approx.)

(+)

(–)

Alternator harness connector

Terminal

F60

4

Ground

Battery voltage

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CHARGING SYSTEM

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CHARGING SYSTEM

Wiring Diagram - CHARGING SYSTEM -

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JCMWM3186GB

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CHARGING SYSTEM

JCMWN0039GB

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CHARGING SYSTEM

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JCMWN0040GB

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CHARGING SYSTEM

JCMWN0041GB

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CHARGING SYSTEM

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JCMWN0042GB

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< SYMPTOM DIAGNOSIS >

CHARGING SYSTEM

SYMPTOM DIAGNOSIS

CHARGING SYSTEM

Symptom Table

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Symptom

Reference

Discharged battery

Refer to 

CHG-3, "Work Flow"

.

The charge warning lamp does not illuminate when the ignition 
switch is set to ON.

The charge warning lamp does not turn OFF after the engine 
starts.

The charging warning lamp turns ON when increasing the engine 
speed.

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PRECAUTIONS

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PRECAUTION

PRECAUTIONS

FOR USA AND CANADA

FOR USA AND CANADA : Precaution for Supplemental Restraint System (SRS) "AIR 
BAG" and "SEAT BELT PRE-TENSIONER"

INFOID:0000000006260557

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

FOR USA AND CANADA : Precaution for Power Generation Voltage Variable Control 
System

INFOID:0000000006260558

CAUTION:

For this model, the battery current sensor that is installed to the battery cable at the negative terminal
measures the charging/discharging current of the battery, and performs various controls. If the electri-
cal component or the ground wire is connected directly to the battery terminal, the current other than
that being measured with the battery current sensor is charging to or discharging from the battery.
This condition causes the malfunction of the control, and then the battery discharge may occur. Do
not connect the electrical component or the ground wire directly to the battery terminal.

FOR MEXICO

FOR MEXICO : Precaution for Supplemental Restraint System (SRS) "AIR BAG" and 
"SEAT BELT PRE-TENSIONER"

INFOID:0000000006260559

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the “SRS AIR BAG” and
“SEAT BELT” of this Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.

Revision: 2011 November

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< PRECAUTION >

PRECAUTIONS

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

FOR MEXICO : Precaution for Power Generation Voltage Variable Control System

INFOID:0000000006260560

CAUTION:

For this model, the battery current sensor that is installed to the battery cable at the negative terminal
measures the charging/discharging current of the battery, and performs various controls. If the electri-
cal component or the ground wire is connected directly to the battery terminal, the current other than
that being measured with the battery current sensor is charging to or discharging from the battery.
This condition causes the malfunction of the control, and then the battery discharge may occur. Do
not connect the electrical component or the ground wire directly to the battery terminal.

Revision: 2011 November

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PREPARATION

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< PREPARATION >

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PREPARATION

PREPARATION

Special Service Tools

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Commercial Service Tools

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Tool number
(Kent-Moore No.)
Tool name

Description

—

(J-44373 Model MCR620)
Starting/Charging System Tester

Tests starting and charging systems.
For operating instructions, refer to Technical 
Service Bulletin.

SEL403X

Tool name

Description

Power tool

Loosening bolts, nuts and screws

PIIB1407E

Revision: 2011 November

2011 MURANO