Nissan Frontier. Manual - part 201

CHG

DIAGNOSIS AND REPAIR WORKFLOW

CHG-7

< BASIC INSPECTION >

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YES

>> GO TO 4.

NO

>> GO TO 10.

4.

INSPECTION WITH CHARGE WARNING LAMP (IDLING) 

Start the engine and run it at idle 
Does the charge warning lamp turn OFF?

YES

>> GO TO 5.

NO

>> GO TO 6.

5.

INSPECTION WITH CHARGE WARNING LAMP (ENGINE AT 2,500 RPM)

Increase and maintain the engine speed at 2,500 rpm.
Does the charge warning lamp illuminate?

YES

>> GO TO 8.

NO

>> Inspection End.

6.

“L” TERMINAL CIRCUIT (SHORT) INSPECTION

Check terminal “L” circuit for (short). Refer to 

CHG-16, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair as needed.

7.

“S” TERMINAL CIRCUIT INSPECTION

Check terminal “S” circuit. Refer to 

CHG-17, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair as needed.

8.

MEASURE “B” TERMINAL VOLTAGE

Start engine. With engine running at 2,500 rpm, measure “B” terminal voltage. 
What voltage does the measurement result show?

Less than 13.0 V>>GO TO 9.

More than 16.0 V>>Replace generator. Refer to 

CHG-28, "Removal and Installation - QR25DE Models"

 or

CHG-29, "Removal and Installation - VQ40DE Models"

. 

9.

“B” TERMINAL CIRCUIT INSPECTION 

Check “B” terminal circuit. Refer to 

CHG-13, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace generator. Refer to 

CHG-28, "Removal and Installation - QR25DE Models"

 or 

CHG-29,

"Removal and Installation - VQ40DE Models"

.

NO

>> Repair as needed.

10.

INSPECTION WITH CHARGE WARNING LAMP (IGNITION SWITCH IS ON) 

1. Disconnect generator connector and apply ground to “L” terminal. 

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

YES

>> Replace generator. Refer to 

CHG-28, "Removal and Installation - QR25DE Models"

 or 

CHG-29,

"Removal and Installation - VQ40DE Models"

.

NO

>> GO TO 11.

11.

CHECK “L” TERMINAL CIRCUIT (OPEN)

Check “L” terminal circuit (OPEN). Refer to 

CHG-14, "Diagnosis Procedure"

.

>> Repair as needed.

CHG-8

< SYSTEM DESCRIPTION >

CHARGING SYSTEM

SYSTEM DESCRIPTION

CHARGING SYSTEM

System Diagram

INFOID:0000000009482309

System Description

INFOID:0000000009482310

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:0000000009482311

ALMIA0207GB

Component part

Description

Generator

Terminal “1”

Refer to 

CHG-13, "Description"

.

Terminal “2”

Refer to 

CHG-14, "Description"

.

Terminal “3”

Refer to  

CHG-17, "Description"

.

Terminal “4”

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

CHG-9, "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-9, "System Description"

.

CHG

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

CHG-9

< SYSTEM DESCRIPTION >

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POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

System Diagram

INFOID:0000000009482312

System Description

INFOID:0000000009482313

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:0000000009482314

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.

CHG-10

< DTC/CIRCUIT DIAGNOSIS >

CHARGING SYSTEM PRELIMINARY INSPECTION

DTC/CIRCUIT DIAGNOSIS

CHARGING SYSTEM PRELIMINARY INSPECTION

Diagnosis Procedure

INFOID:0000000009482315

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 terminal connection. Confirm repair by performing complete Charging system test

using EXP-800 NI or GR8-1200 NI (if available). Refer to the 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

>> Replace the blown fuse or fusible link after repairing the affected circuit.

3.

CHECK GENERATOR GROUND TERMINAL CONNECTION

Check if connector E209 terminal 5 is clean.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair connection.

4.

CHECK DRIVE BELT TENSION

Check drive belt tension. Refer to 

CHG-28, "Removal and Installation - QR25DE Models"

 or 

CHG-29,

"Removal and Installation - VQ40DE Models"

.

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