Nissan Pathfinder (2012 year). Manual - part 123

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< SYSTEM DESCRIPTION >

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

System Diagram

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System Description

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Power generation variable voltage control system has been adopted.  By varying the voltage to the generator,

engine load due to power generation of the generator is reduced and fuel consumption is decreased. 

NOTE:

When any malfunction is detected in the power generation variable voltage control system, power generation

is performed according to the characteristic of the IC regulator in the generator. 

Component Description

INFOID:0000000007355050

ALMIA0057GB

Component part

Description

Battery current sensor

The battery current sensor is installed on the battery cable at the 
negative terminal. The battery current sensor detects the charg-
ing/discharging current of the battery and sends a voltage signal 
to the ECM according to the current value detected.

ECM

The battery current sensor detects the charging/discharging cur-
rent of the battery. The ECM judges the battery condition based on 
this signal.
The ECM judges whether to request more output via the power 
generation voltage variable control according to the battery condi-
tion.
When performing the power generation voltage variable control, 
the ECM calculates the target power generation voltage according 
to the battery condition and sends the calculated value as the pow-
er generation command value to the IPDM E/R.

IPDM E/R

The IPDM E/R converts the received power generation command 
value into a pulse width modulated (PWM) command signal and 
sends it to the IC regulator.

Generator (IC regulator)

The IC regulator controls the power generation voltage by the tar-
get power generation voltage based on the received PWM com-
mand signal.
When there is no PWM command signal, the generator performs 
the normal power generation according to the characteristic of the 
IC regulator.

August 2012

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CHARGING SYSTEM PRELIMINARY INSPECTION

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DTC/CIRCUIT DIAGNOSIS

CHARGING SYSTEM PRELIMINARY INSPECTION

Diagnosis Procedure

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1.

CHECK BATTERY TERMINALS CONNECTION

Check if battery terminals are clean and tight.
Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair battery terminals connection. Confirm repair by performing complete Charging system test

using EXP-800 NI or GR8-1200 NI (if available). Refer to applicable Instruction Manual for proper

testing procedures.

2.

CHECK FUSE

Check for blown fuse and fusible link.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Be sure to eliminate cause of malfunction before installing new fuse or fusible link.

3.

CHECK GENERATOR GROUND TERMINAL CONNECTION

Verify connector E209 terminal 5 (generator ground harness) is clean and tight.
Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair connection.

4.

CHECK DRIVE BELT TENSION

Check drive belt tension. Refer to 

EM-14, "Checking Drive Belts"

 (VQ40DE) or 

EM-152, "Checking Drive

Belts"

 (VK56DE).

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair as needed.

Unit

Power source (Power supply terminals)

Fuse or Fusible Link

Generator

Battery (terminal 3)

Fuse 30

Battery (terminal 1)

Fusible Link 

A

Combination meter

Ignition switch ON (terminal 16)

Fuse 14

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< DTC/CIRCUIT DIAGNOSIS >

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM OPERATION 

INSPECTION

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM OPER-
ATION INSPECTION

Diagnosis Procedure

INFOID:0000000007355052

Regarding Wiring Diagram information, refer to 

CHG-21, "Wiring Diagram"

.

CAUTION:

When performing this inspection, always use a charged battery that has completed the battery inspec-

tion. (When the charging rate of the battery is low, the response speed of the voltage change will

become slow. This can cause an incorrect inspection.)

1.

CHECK ECM (CONSULT)

Perform ECM self-diagnosis with CONSULT. Refer to 

EC-77, "CONSULT Function"

 (VQ40DE) or 

EC-533,

"CONSULT Function"

 (VK56DE).

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Check applicable parts, and repair or replace corresponding parts.

2.

CHECK OPERATION OF POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

1. Connect  and start the engine.

2. The selector lever is in “P” or “N” position and all of the electric loads and A/C, etc. are turned OFF.

3. Select “ALTERNATOR DUTY” in “Active Test” of “ENGINE”, and then check the value of “BATTERY

VOLT” monitor when DUTY value of “ALTERNATOR DUTY” is set to 40.0 %.

4. Check the value of “BATTERY VOLT” monitor when DUTY value of “ALTERNATOR DUTY” is set to

80.0%.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> GO TO 3

3.

CHECK IPDM E/R (CONSULT)

Perform IPDM E/R self-diagnosis with CONSULT. Refer to 

PCS-11, "CONSULT Function (IPDM E/R)"

.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Check applicable parts, and repair or replace corresponding parts.

4.

CHECK HARNESS BETWEEN GENERATOR AND IPDM E/R

“BATTERY VOLT”
2 seconds after setting the 
DUTY value of “ALTERNA-
TOR DUTY” to 40.0 %

: 12 - 13.6 V

“BATTERY VOLT”
20 seconds after setting 
the DUTY value of “ALTER-
NATOR DUTY” to 80.0 %

: +0.5 V or more against 
the value of “BATTERY 
VOLT” monitor when 
DUTY value is 40.0 %

August 2012

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POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM OPERATION 

INSPECTION

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1. Turn ignition switch OFF.

2. Disconnect generator connector E205 and IPDM E/R connector

E122.

3. Check continuity between generator harness connector E205

(A) terminal 4 and IPDM E/R harness connector E122 (B) termi-

nal 37.

4. Check continuity between generator harness connector E205

(A) terminal 4 and ground.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-29, "Removal and Installation of IPDM E/R"

.

NO

>> Repair harness or connector between IPDM E/R and generator. 

A

B

Continuity

Connector

Terminal

Connector

Terminal

E205

4

E122

37

Yes

ALMIA0196ZZ

A

—

Continuity

Connector

Terminal

E205

4

Ground

No

August 2012

2012 Pathfinder

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< DTC/CIRCUIT DIAGNOSIS >

B TERMINAL CIRCUIT

B TERMINAL CIRCUIT

Description

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The terminal “1” (B) circuit supplies power to charge the battery and operate the vehicles electrical system.

Diagnosis Procedure

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Regarding Wiring Diagram information, refer to 

CHG-21, "Wiring Diagram"

.

1.

CHECK TERMINAL “1” CONNECTION

1. Turn ignition switch OFF.

2. Verify terminal “1” is clean and tight.
Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair terminal “1” connection. Confirm repair by performing complete Charging system test

using EXP-800 NI or GR8-1200 NI (if available). Refer to applicable Instruction Manual for proper

testing procedures.

2.

CHECK TERMINAL “1” CIRCUIT

Check voltage between generator connector E206 terminal 1 and

ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check harness for open between generator and fusible

link.

3.

CHECK TERMINAL “1” CONNECTION (VOLTAGE DROP TEST)

1. Start engine, then engine running at idle and warm.

2. Check voltage between battery positive terminal and generator

connector E206 terminal 1.

Is the inspection result normal?

YES

>> Terminal “1” circuit is normal. Refer to 

CHG-5, "Work

Flow (With EXP-800 NI or GR8-1200 NI)"

 or 

CHG-8,

"Work Flow (Without EXP-800 NI or GR8-1200 NI)"

.

NO

>> Check harness between battery and generator for high resistance.

(+)

(-)

Voltage

Connector

Terminal

E206

1

Ground

Battery voltage

ALMIA0197ZZ

(+)

(-)

Voltage

Connector

Terminal

E206

1

Battery positive terminal

Less than 0.2V

ALMIA0198ZZ

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L TERMINAL CIRCUIT (OPEN)

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< DTC/CIRCUIT DIAGNOSIS >

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L TERMINAL CIRCUIT (OPEN)

Description

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The “2” (L) terminal circuit controls the charge warning lamp. The charge warning lamp turns ON when the

ignition switch is set to ON or START. When the generator is providing sufficient voltage with the engine run-

ning, the charge warning lamp turns OFF. If the charge warning lamp illuminates with the engine running, a

malfunction is indicated.

Diagnosis Procedure

INFOID:0000000008802448

Regarding Wiring Diagram information. Refer to 

CHG-21, "Wiring Diagram"

.

1.

CHECK “2” TERMINAL CONNECTION

1. Turn ignition switch OFF.

2. Check if “2” terminal is clean and tight.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair “2” terminal connection. Confirm repair by performing complete Charging system test

using EXP-800 NI or GR8-1200 NI (if available). Refer to applicable Instruction Manual for proper

testing procedures.

2.

CHECK “2” TERMINAL CIRCUIT (OPEN)

1. Disconnect the generator connector.

2. Apply ground to generator harness connector terminal. 

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

Does it illuminate?

YES

>> “2” terminal circuit is normal. Refer to 

CHG-5, "Work Flow (With EXP-800 NI or GR8-1200 NI)"

 or

CHG-8, "Work Flow (Without EXP-800 NI or GR8-1200 NI)"

.

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 generator harness connector and combination meter harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace the harness or connectors.

4.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Check continuity between combination meter harness connector and fuse block (J/B).

Generator

Ground

Condition

Connector

Terminal 

Ignition switch position

Charge warning lamp

E205

2

ON

Illuminate

Generator

Combination meter

Continuity

Connector

Terminal

Connector

Terminal

E205

2

M24

2

Yes

Combination meter 

Fuse box (J/B)

Continuity 

Connector

Terminal Connector Terminal 

M24

16

M4

5P

Yes

August 2012

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< DTC/CIRCUIT DIAGNOSIS >

L TERMINAL CIRCUIT (OPEN)

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace the harness or connectors.

5.

CHECK POWER SUPPLY CIRCUIT 

1. Connect the battery cable to the negative terminal.

2. Check voltage between combination meter harness connector and ground.

Is the inspection result normal?

YES

>> Replace the combination meter. Refer to 

MWI-89, "Removal and Installation"

.

NO

>> Repair or replace the harness or connectors. 

(+)

(-)

Condition 

Voltage 

(Approx.)

Combination meter 

Connector

Terminal

M24

2

Ground

When the ignition 

switch is in ON position

Battery voltage

August 2012

2012 Pathfinder

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L TERMINAL CIRCUIT (SHORT)

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L TERMINAL CIRCUIT (SHORT)

Description

INFOID:0000000008802449

The terminal “2” (L) circuit controls the charge warning lamp. The charge warning lamp turns ON when the

ignition switch is set to ON or START. When the generator is providing sufficient voltage with the engine run-

ning, the charge warning lamp turns off. If the charge warning lamp illuminates with the engine running, a mal-

function is indicated.

Diagnosis Procedure

INFOID:0000000008802450

Regarding Wiring Diagram information, refer to 

CHG-21, "Wiring Diagram"

.

1.

CHECK “2” TERMINAL CIRCUIT (SHORT)

1. Turn ignition switch OFF. 

2. Disconnect generator connector.

3. Turn ignition switch ON.
Does charge warning lamp illuminate?

YES

>> GO TO 2.

NO

>> Refer to 

CHG-5, "Work Flow (With EXP-800 NI or GR8-1200 NI)"

 or 

CHG-8, "Work Flow (Without

EXP-800 NI or GR8-1200 NI)"

. 

2.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

1. Turn ignition switch OFF.

2. Disconnect the battery cable from the negative terminal. 

3. Disconnect combination meter connector.

4. Check continuity between the combination meter harness connector and ground.

Is the inspection result normal?

YES

>> Replace the combination meter. Refer to 

MWI-89, "Removal and Installation"

. 

NO

>> Repair or replace the harness or connectors. 

Combination meter

Ground

Continuity

Connector

Terminal

M24

2

No

August 2012

2012 Pathfinder