Nissan GT-R. Manual - part 62

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CHARGING SYSTEM

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< SYSTEM DESCRIPTION >

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Component Description

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Component part

Description

Alternator

The alternator provides DC voltage to operate the vehicle electri-
cal system and to keep the battery charged.

Combination meter (Charge warning lamp)

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

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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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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

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JMMIA0388GB

1.

Alternator

2.

ECM

3.

IPDM E/R

4.

Battery current sensor

A.

Battery

NNMIB0006ZZ

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POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

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< SYSTEM DESCRIPTION >

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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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< DTC/CIRCUIT DIAGNOSIS >

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 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 “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.

NO

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

Terminals

Voltage (Approx.)

(+)

(–)

Alternator “B” terminal

Terminal

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Ground

Battery voltage

Terminals

Voltage (Approx.)

(+)

(–)

Alternator “B” terminal

Terminal

Battery positive terminal

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Less than 0.2 V