Nissan GT-R. Manual - part 143

GI-44

< BASIC INSPECTION >

SERVICE INFORMATION FOR ELECTRICAL INCIDENT

Note in the illustration that there is an excessive 4.1 volt drop between the battery and the bulb.

Measuring Voltage Drop — Step-by-Step

• The step-by-step method is most useful for isolating excessive drops in low voltage systems (such as those

in “Computer Controlled Systems”).

• Circuits in the “Computer Controlled System” operate on very low amperage.
• The (Computer Controlled) system operations can be adversely affected by any variation in resistance in the

system. Such resistance variation may be caused by poor connection, improper installation, improper wire
gauge or corrosion.

• The step by step voltage drop test can identify a component or wire with too much resistance.

CONTROL UNIT CIRCUIT TEST 

System Description
• When the switch is ON, the control unit lights up the lamp.

CASE 1

SGI974

SAIA0258E

MGI034A

SERVICE INFORMATION FOR ELECTRICAL INCIDENT

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INPUT-OUTPUT VOLTAGE CHART

• The voltage value is based on the body ground.

• *: If high resistance exists in the switch side circuit (caused by a single strand), terminal 1 does not detect battery voltage. Control unit

does not detect the switch is ON even if the switch does not turn ON. Therefore, the control unit does not supply power to light up the
lamp.

CASE 2

INPUT-OUTPUT VOLTAGE CHART

• The voltage value is based on the body ground.

• *: If high resistance exists in the switch side circuit (caused by a single strand), terminal 2 does not detect approx. 0 V. Control unit

does not detect the switch is ON even if the switch does not turn ON. Therefore, the control unit does not control ground to light up the
lamp.

Terminal No.

Description

Condition

Value (Approx.)

In case of high resistance such as single 
strand (V) *

+

−

Signal name

Input/

Output

1

Body 
ground

Switch

Input

Switch ON

Battery voltage

Lower than battery voltage Approx. 8 (Ex-
ample)

Switch OFF

0 V

Approx. 0

2

Body 
ground

Lamp

Output

Switch ON

Battery voltage

Approx. 0 (Inoperative lamp)

Switch OFF

0 V

Approx. 0

Terminal No.

Description

Condition

Value (Approx.)

In case of high resistance such as single 
strand (V) *

+

−

Signal name

Input/

Output

1

Body 
ground

Lamp

Output

Switch ON

0 V

Battery voltage (Inoperative lamp)

Switch OFF

Battery voltage

Battery voltage

2

Body 
ground

Switch

Input

Switch ON

0 V

Higher than 0 Approx. 4 (Example)

Switch OFF

5 V

Approx. 5

MGI035A

GI-46

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CONSULT/GST CHECKING SYSTEM

CONSULT/GST CHECKING SYSTEM

Description

INFOID:0000000009161512

• When CONSULT/GST is connected with a data link connector (A)

equipped on the vehicle side, it will communicate with the control
unit equipped in the vehicle and then enable various kinds of diag-
nostic tests.

• Refer to “CONSULT Software Operation Manual” for more informa-

tion.

CONSULT Function and System Application*1

INFOID:0000000009161513

FUNCTION

*: Permanent DTC is not applied for regions where it is not mandated.

SYSTEM APPLICATION

*1

1

: Instrument lower panel (driver)

JPAIA0329ZZ

Mode

Function

All DTC Reading

Display all DTCs or diagnostic items that all ECUs are recording and judging.

Work Support

This mode enables a technician to adjust some devices faster and more accurately.

Self Diagnostic Results

Retrieve DTC from ECU and display diagnostic items.

Data Monitor

Monitor the input/output signal of the control unit in real time.

CAN Diagnosis

This mode displays a network diagnosis result about CAN by a diagram.

CAN Diagnosis Support Monitor

It monitors the status of CAN communication.

Active Test

Send the drive signal from CONSULT to the actuator. The operation check can be performed.

ECU Identification

Display the ECU identification number (part number etc.) of the selected system.

Configuration

Function to READ/WRITE vehicle configuration.

SRT&P-DTC Conirmation

The state of System Readiness Test (SRT) items, the presence or absence or permanent DTC

*

, 

and driving conditions can be checked.

DTC work support

DTC reproduction procedure can be performed speedily and precisely.

Other

Other results or histories, etc. that are recorded in ECU are displayed.

ALL DTC Reading

W

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ito

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CAN D

iagnosis

CAN Di

ag

no

si

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Acti

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 T

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ECU Id

en

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icati

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Co

nf

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rat

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SR

T&P

-DTC Confirmation

DTC work 

support

Other

ENGINE

×

×

×

×

×

×

×

×

–

×

*2

×

–

TRANSMISSION

×

×

×

×

×

×

×

×

–

×

*2

–

–

ALL MODE AWD/4WD

×

–

×

×

×

×

×

×

–

–

–

–

ABS

×

×

×

×

×

×

×

×

–

–

–

–

CONSULT/GST CHECKING SYSTEM

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x: Applicable

*1: If GST application is equipped, functions in accordance with SAE J1979 and ISO 15031-5 can be used.

*2: Permanent DTC is not applied for regions where it is not mandated.

CONSULT/GST Data Link Connector (DLC) Circuit

INFOID:0000000009161514

INSPECTION PROCEDURE

If the CONSULT/GST cannot diagnose the system properly, check the following items.

NOTE:
The DDL1 and DDL2 circuits from DLC pins 12, 13, 14 and 15 may be connected to more than one system. A
short in a DDL circuit connected to a control unit in one system may affect CONSULT access to other systems.
If the GST cannot operate properly, check the circuit based on the information of SAE J1962 and ISO 15031-
3.

AIR BAG

×

–

×

–

×

–

–

×

–

–

–

• TROUBLE DIAG RECORD

IPDM E/R

×

–

×

×

×

×

×

×

–

–

–

–

BCM

×

×

×

×

×

×

×

×

×

–

–

–

MULTI AV

–

×

×

×

×

×

–

×

×

–

–

–

METER/M&A

×

–

×

×

×

×

–

–

–

–

–

• Warning  History

E-SUS

×

–

×

×

×

×

×

×

–

–

–

–

AIR PRESSURE MONITOR

×

×

×

×

×

×

×

×

–

–

–

–

HVAC

–

×

×

×

×

×

×

×

–

–

–

–

ALL DTC 

Reading

W

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 Dia

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Dat

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CA

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CAN Diagnosis Su

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ECU I

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SR

T&

P-DTC Confirmation

DTC work 

support

Other

Symptom

Check item

CONSULT/GST cannot access 
any system.

• CONSULT/GST DLC power supply circuit (Terminal 8 and 16) and ground circuit (Terminal 4 and 5) 

CONSULT cannot access indi-
vidual system. (Other systems 
can be accessed.)

• Power supply and ground circuit for the control unit of the system (For detailed circuit, refer to wiring 

diagram for each system.)

• Open or short circuit between the system and CONSULT DLC (For detailed circuit, refer to wiring 

diagram for each system.)

• Open or short circuit CAN communication line.