Nissan Pathfinder (2008 year). Manual - part 124

CHG-4

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

INFOID:0000000001712755

OVERALL SEQUENCE

DETAILED FLOW

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DIAGNOSIS AND REPAIR WORKFLOW

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< BASIC INSPECTION >

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NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and generator test segments must be done
as a set from start to finish.

1.

PRELIMINARY INSPECTION

Perform the preliminary inspection. Refer to 

CHG-9, "Inspection Procedure"

.

>> GO TO 2

2.

DISABLE THE POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

Disable the power generation voltage variable control with either of the following procedures.
• After selecting “ENGINE” on the “SELECT SYSTEM” screen of CONSULT-III, set the “ALTERNATOR DUTY”

value to 0 % by selecting “ALTERNATOR DUTY” with “Active Test”. Continue “Active Test” until the end of
inspection. (When the DUTY value is 0 or 100 %, the normal power generation is performed according to the
characteristic of the IC regulator of the generator.)

• Turn the ignition switch OFF, disconnect the battery current sensor connector and leave it disconnected dur-

ing the course of the test.

NOTE:
Running the engine with the battery current sensor disconnected will cause DTC's (P1550-P1554) to set.
After finishing the inspection, connect the battery current sensor connector and erase the self-diagnostic
results history of the engine using CONSULT-III.

>> GO TO 3

3.

DIAGNOSIS WITH STARTING/CHARGING SYSTEM TESTER

Perform the charging system test using Starting/Charging System Tester (J-44373). For details and operating
instructions, refer to Technical Service Bulletin.

Test result

CHARGING SYSTEM NOMAL>>Charging system is normal and will also show “DIODE RIPPLE” test result.
NO CHARGING VOLTAGE>>GO TO 4
LOW CHARGING VOLTAGE>>GO TO 12
HIGH CHARGING VOLTAGE>>GO TO 14
DIODE RIPPLE NORMAL>>Diode ripple is OK and will also show “CHARGING VOLTAGE” test result.
EXCESS RIPPLE DETECTED>>Replace the generator. Perform “DIODE RIPPLE” test again using Starting/

Charging System Tester (J-44373) to confirm repair.

DIODE RIPPLE NOT DETECTED>>GO TO 4

4.

INSPECTION WITH CHARGE WARNING LAMP (IGNITION SWITCH IS ON)

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

YES

>> GO TO 6

NO

>> GO TO 5

5.

TERMINAL“2” (OPEN) CIRCUIT INSPECTION

Check terminal “2” circuit for open circuits. Refer to 

CHG-13, "Description"

.

Is the terminal “2” circuit normal?

YES

>> Replace generator.

NO

>> Repair as needed.

6.

INSPECTION WITH CHARGE WARNING LAMP (IDLING)

Start the engine and run it at idle.

Does the charge warning lamp turn OFF?

YES

>> GO TO 9

NO

>> GO TO 7

7.

TERMINAL “2”(SHORT) CIRCUIT INSPECTION

Check terminal “2” circuit for short to ground. Refer to 

CHG-13, "Description"

.

Is the terminal “2” circuit normal?

CHG-6

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

YES

>> GO TO 8

NO

>> Repair as needed.

8.

TERMINAL“3” CIRCUIT INSPECTION

Check terminal “3” circuit. Refer to 

CHG-14, "Description"

.

Is the terminal “3” circuit normal?

YES

>> GO TO 10

NO

>> Repair as needed.

9.

INSPECTION WITH CHARGE WARNING LAMP (ENGINE AT 3,000 RPM)

Increase and maintain the engine speed at 3,000 rpm.

Does the charge warning lamp remain off?

YES

>> GO TO 11

NO

>> GO TO 10

10.

INSPECTION OF GENERATOR PULLEY

Check generator pulley.
Is generator pulley normal?

YES

>> Replace generator. Refer to 

CHG-21, "Removal and Installation"

.

NO

>> Repair as needed.

11.

TERMINAL “1” CIRCUIT INSPECTION

Check terminal “1””circuit. Refer to 

CHG-12, "Description"

.

Is terminal “1” circuit normal?

YES

>> Replace generator. Refer to 

CHG-21, "Removal and Installation"

.

NO

>> Repair as needed.

12.

TERMINAL “1” CIRCUIT INSPECTION

Check terminal “1” circuit. Refer to 

CHG-12, "Description"

.

Is terminal “1” circuit normal?

YES

>> GO TO 13

NO

>> Repair as needed.

13.

INSPECTION OF GENERATOR PULLEY

Check generator pulley.
Is generator pulley normal?

YES

>> Replace generator. Refer to 

CHG-21, "Removal and Installation"

.

NO

>> Repair as needed.

14.

TERMINAL “3” CIRCUIT INSPECTION

Check terminal“3” circuit. Refer to 

CHG-14, "Description"

.

Is the terminal “3” circuit normal?

YES

>> Replace generator. Refer to 

CHG-21, "Removal and Installation"

.

NO

>> Repair as needed.

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CHARGING SYSTEM

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< FUNCTION DIAGNOSIS >

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FUNCTION DIAGNOSIS

CHARGING SYSTEM

System Diagram

INFOID:0000000001712756

System Description

INFOID:0000000001712757

The generator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.

Component Description

INFOID:0000000001712758

ALMIA0207GB

Component part

Description

Generator

Terminal “1”

Refer to 

CHG-12, "Description"

.

Terminal “2”

Refer to 

CHG-14, "Description"

.

Terminal “3”

Refer to 

CHG-13, "Description"

.

Terminal “4”

Used for the power generation voltage variable control system. 
Refer to 

CHG-8, "System Description"

.

Combination meter (Charge warning lamp)

The IC regulator warning function activates to illuminate the 
charge warning lamp if any of the following symptoms occur while 
generator is operating:
• Excessive voltage is produced.
• No voltage is produced.

IPDM E/R

Used for the power generation voltage variable control system. 
Refer to 

CHG-8, "System Description"

.

CHG-8

< FUNCTION DIAGNOSIS >

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

System Diagram

INFOID:0000000001712759

System Description

INFOID:0000000001712760

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:0000000001712761

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.

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CHARGING SYSTEM PRELIMINARY INSPECTION

CHG-9

< COMPONENT DIAGNOSIS >

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COMPONENT DIAGNOSIS

CHARGING SYSTEM PRELIMINARY INSPECTION

Inspection 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.

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-13, "Tension Adjustment"

.

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 2)

Fuse 14

CHG-10

< COMPONENT DIAGNOSIS >

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM OPERATION 

INSPECTION

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM OPER-
ATION INSPECTION

Inspection Procedure

INFOID:0000000001712763

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-III)

Perform ECM self-diagnosis with CONSULT-III. Refer to 

EC-74, "CONSULT-III Function (ENGINE)"

.

Self-diagnostic results content

No malfunction detected>> GO TO 2
Malfunction detected>> Check applicable parts, and repair or replace corresponding parts.

2.

CHECK OPERATION OF POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

1.

Connect CONSULT-III 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 measurement value within specification?

YES

>> Inspection end.

NO

>> GO TO 3

3.

CHECK IPDM E/R (CONSULT-III)

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

PCS-12, "CONSULT - III Function (IPDM E/R)"

.

Self-diagnostic results content

No malfunction detected>> GO TO 4
Malfunction detected>> Check applicable parts, and repair or replace corresponding parts.

4.

CHECK HARNESS BETWEEN GENERATOR AND IPDM E/R

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.

“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 %

A

B

Continuity

Connector

Terminal

Connector

Terminal

E205

4

E122

37

Yes

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POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM OPERATION 

INSPECTION

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4.

Check continuity between generator harness connector E122 (A) terminal 4 and ground.

Are the continuity test results as specified?

YES

>> Replace IPDM E/R.

NO

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

A

—

Continuity

Connector

Terminal

E205

4

Ground

No