Nissan Maxima. Manual - part 291

CHG-6

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

• Use fully charged battery.

DETAILED FLOW

1.

PRELIMINARY INSPECTION

Perform the preliminary inspection. Refer to 

CHG-10, "Diagnosis Procedure"

.

>> GO TO 2.

2.

STOP POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

Stop the operation of the power generation voltage variable control in either of the following procedures:

• After selecting “ENGINE” using CONSULT, set the DUTY value of “ALTERNATOR DUTY” to 0 % by select-

ing “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, and disconnect the battery current sensor connector. [However, DTC (P1550 -

P1554) of the engine might remain. After finishing the inspection, connect the battery current sensor connec-

tor and erase the self-diagnostic results history of the engine using CONSULT.] 

>> GO TO 3.

3.

INSPECTION WITH CHARGE WARNING LAMP (IGNITION SWITCH IS TURNED ON)

When ignition switch is turned ON.
Does the charge warning lamp illuminate?

ALMIA0577GB

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"

. 

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"

.

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"

.

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:0000000009465964

System Description

INFOID:0000000009465965

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:0000000009465966

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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:0000000009465967

System Description

INFOID:0000000009465968

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:0000000009465969

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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.