Nissan Pathfinder. Manual — part 664

SERVICE INFORMATION FOR ELECTRICAL INCIDENT

GI-55

< BASIC INSPECTION >

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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

GI-56

< BASIC INSPECTION >

SERVICE INFORMATION FOR ELECTRICAL INCIDENT

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

CONSULT CHECKING SYSTEM

GI-57

< BASIC INSPECTION >

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CONSULT CHECKING SYSTEM

Description

INFOID:0000000009189731

NOTE:

This vehicle is diagnosed using CONSULT-III plus

• When CONSULT 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-III plus Software Operation Manual for more

information.

CONSULT Function and System Application

INFOID:0000000009189732

x: Applicable
*1: If equipped

CONSULT Data Link Connector (DLC) Circuit

INFOID:0000000009189733

INSPECTION PROCEDURE

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

1

: Instrument lower panel LH

ALAIA0056ZZ

Diagnostic test

mode

Function

ENGINE

TRANSMISSION

AIR BAG

METER/M

&

A

AUT

O

B

A

CK DOOR

*1

BCM

AUT

O

DRIVE

POS.

*1

ABS

IP

DM E/

R

ALL MODE

A

W

D/4W

D

*1

MUL

T

I A

V

SON

A

R

*1

AIR PRE

SSURE MO

NIT

O

R

HV

AC

CAN GA

TEW

A

Y

*1

AV

M

*1

EPS

OCCUP

ANT DETE

CTION

*1

Work support

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

x

x

-

x

x

x

x

x

-

x

-

x

x

x

-

x

-

x

Self Diagnostic
Result

Retrieve DTC from ECU and display diag-
nostic items.

x

x

x

x

x

x

x

x

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

x

x

x

x

x

-

x

x

-

Active Test

Send the drive signal from CONSULT to the
actuator. The operation check can be per-
formed.

x

x

-

-

-

x

x

x

x

x

-

x

x

x

-

-

-

-

DTC Work Support

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

x

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

ECU
identification

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

x

x

x

-

x

x

x

x

x

x

x

x

x

x

x

x

x

-

TROUBLE
DIAG RECORD

Other results or histories, etc. that are re-
corded in ECU are displayed.

-

-

x

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

Warning
History

Displays the history of the combination meter
warning lamp indicators.

-

-

-

x

-

-

-

-

-

-

-

-

-

-

-

-

-

-

CALIB DATA

The calibration values of the ECU are dis-
played.

-

x

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

GI-58

< BASIC INSPECTION >

CONSULT CHECKING SYSTEM

NOTE:

The DDL1 and DDL2 CAN communication lines from DLC pins 6, 7, 12, 13 and 14 may be connected to more

than one system. A short in a DDL circuit or CAN lines connected to a control unit in one system may affect

CONSULT access to other systems. For a complete DDL circuit layout, refer to one of the following:

•

GI-42, "Wiring Diagram - With Around View Monitor"

•

GI-44, "Wiring Diagram - Without Around View Monitor"

For a complete CAN line layout, refer to

LAN-49, "Wiring Diagram"

.

Symptom

Check item

CONSULT cannot access any
system.

• CONSULT 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. Refer to

LAN-20, "Trouble Diagnosis Flow Chart"

.