Nissan Frontier D40. Instruction — part 707

GI-52

< 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 — Steb-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

GI-53

< BASIC INSPECTION >

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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. 0V. 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

0V

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-54

< BASIC INSPECTION >

CONSULT-III CHECKING SYSTEM

CONSULT-III CHECKING SYSTEM

Description

INFOID:0000000005273010

• When CONSULT-III is connected with a data link connector

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-III Operation Instruction” for more information.

Function and System Application

INFOID:0000000005273011

x : Applicable

*1: With automatic transmission

*2: With differential lock

*3: With 4-wheel drive

CONSULT-III Data Link Connector (DLC) Circuit

INFOID:0000000005273012

INSPECTION PROCEDURE

If the CONSULT-III cannot diagnose the system properly, check the following items.

BBIA0538E

Diagnostic test mode

Function

ENGINE

TRANSMISS

ION

*1

AB

S

AI

R BAG

IPDM

E/R

BCM

METER/

M&A

DIFF LOCK

*2

ALL MODE

A

W

D/4WD

*3

Work Support

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

x

-

x

-

-

x

-

-

-

Self Diagnostic Result

Retrieve DTC from ECU and display diagnostic items.

x

x

x

x

x

x

x

x

x

Data Monitor

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

x

x

x

x

x

x

x

x

x

CAN Diagnosis

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

x

x

x

x

x

x

x

x

x

CAN Diagnosis Support
Monitor

It monitors the status of CAN communication.

x

x

x

-

x

x

x

x

x

Active Test

Sends a drive signal from the CONSULT-III to the actuator.
The operation check can be performed.

x

-

x

-

x

x

-

-

-

DTC & SRT confirmation

The status of system monitoring tests and the self-diagnosis
status/result can be confirmed.

x

x

-

-

-

-

-

-

-

ECU Identification

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

x

x

x

x

-

x

-

x

-

Function test

This mode can show results of self-diagnosis of ECU with ei-
ther “OK” or “NG”. For engine, more practical tests regarding
sensors/switches and/or actuators are available.

x

x

x

x

-

-

-

-

-

Configuration

Function to READ/WRITE vehicle configuration.

-

-

-

-

-

x

-

-

-

Special Function

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

-

-

-

x

-

-

-

-

-

CONSULT-III CHECKING SYSTEM

GI-55

< BASIC INSPECTION >

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NOTE:
The CAN and DDL2 circuits from DLC pins 6, 7 and 14 may be connected to more than one system. A short in
any circuit connected to a control unit in one system may affect CONSULT-III access to other systems.

Symptom

Check item

CONSULT-III cannot access
any system.

• CONSULT-III DLC power supply circuit (Terminal 8) and ground circuit (Terminal 4)

CONSULT-III cannot access in-
dividual system. (Other sys-
tems 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-III DLC (For detailed circuit, refer to wiring

diagram for each system.)

• Open or short circuit CAN communication line. Refer to

LAN-14, "Trouble Diagnosis Flow Chart"

.