Infiniti G37 Coupe. Manual - part 327

 

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Infiniti G37 Coupe. Manual - part 327

 

 

CHG-8

< FUNCTION DIAGNOSIS >

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

System Diagram

INFOID:0000000001666047

System Description

INFOID:0000000001666048

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

INFOID:0000000001666049

JPMIA0632GB

1.

Battery

2.

IPDM E/R

3.

Battery current sensor

4.

ECM

5.

Alternator

A.

Engine room dash panel (RH)

B.

Behind glove box

C.

Engine

JSMIA0011ZZ

CHG

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

CHG-9

< FUNCTION DIAGNOSIS >

C

D

E

F

G

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J

K

L

B

A

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P

N

Component Description

INFOID:0000000001666050

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.

CHG-10

< COMPONENT DIAGNOSIS >

B TERMINAL CIRCUIT

COMPONENT DIAGNOSIS

B TERMINAL CIRCUIT

Description

INFOID:0000000001666051

“B” terminal circuit supplies power to charge the battery and to operate the vehicle’s electrical system.

Diagnosis Procedure

INFOID:0000000001666052

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 Starting/Charging system

test. Refer to Technical Service Bulletin.

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. Refer to 

CHG-3, "Work Flow"

.

NO

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

Terminals

Voltage (Approx.)

(+)

(–)

Alternator “B” terminal

Terminal

E203

1

Ground

Battery voltage

Terminals

Voltage (Approx.)

(+)

(–)

Alternator “B” terminal

Terminal

Battery positive terminal

E203

Less than 0.2 V

CHG

L TERMINAL CIRCUIT (OPEN)

CHG-11

< COMPONENT DIAGNOSIS >

C

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L TERMINAL CIRCUIT (OPEN)

Description

INFOID:0000000001666053

The “L” terminal circuit controls the charge warning lamp. The charge warning lamp illuminates when the igni-
tion switch is set to ON or START. When the alternator is providing sufficient voltage with the engine running,
the charge warning lamp will go off. If the charge warning lamp illuminates with the engine running, a malfunc-
tion is indicated.

Diagnosis Procedure

INFOID:0000000001666054

1.

CHECK “L” TERMINAL CONNECTION

1.

Turn ignition switch OFF.

2.

Check if “L” terminal is clean and tight.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair “L” terminal connection. Confirm repair by performing complete Starting/Charging system

test. Refer to Technical Service Bulletin.

2.

CHECK “L” TERMINAL CIRCUIT (OPEN)

1.

Disconnect alternator connector.

2.

Apply ground to alternator harness connector terminal.

3.

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

Does it illuminate?

YES

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

CHG-3, "Work Flow"

.

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 alternator harness connector and combination meter harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair the harness or connector.

4.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Check continuity between combination meter harness connector and fuse block.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair the harness.

5.

CHECK POWER SUPPLY CIRCUIT

1.

Connect the battery cable to the negative terminal.

Alternator harness connector

Terminal

Ground

Condition

Ignition switch position

Charge warning lamp

F36

2

ON

 illuminate

Alternator harness connector

Combination meter harness connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

F36

2

M53

6

Existed

Combination meter harness connector

Fuse block

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

M53

21

M3

12C

Existed

 

 

 

 

 

 

 

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