Infiniti FX35 / FX45. Manual - part 724

 

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Infiniti FX35 / FX45. Manual - part 724

 

 

SERVICE INFORMATION FOR ELECTRICAL INCIDENT

GI-31

< SERVICE INFORMATION >

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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.

INPUT-OUTPUT VOLTAGE CHART

SGI974

SAIA0258E

MGI034A

GI-32

< SERVICE INFORMATION >

SERVICE INFORMATION FOR ELECTRICAL INCIDENT

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.

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.

Control Units and Electrical Parts

INFOID:0000000001325673

PRECAUTIONS

• Never reverse polarity of battery terminals.
• Install only parts specified for a vehicle.
• Before replacing the control unit, check the input and output and functions of the component parts. 
• Do not apply excessive force when disconnecting a connector.
• Do not apply excessive shock to the control unit by dropping or hit-

ting it.

• Be careful to prevent condensation in the control unit due to rapid

temperature changes and do not let water or rain get on it. If water
is found in the control unit, dry it fully and then install it in the vehi-
cle.

• Be careful not to let oil to get on the control unit connector.
• Avoid cleaning the control unit with volatile oil.
• Do not disassemble the control unit, and do not remove the upper

and lower covers.

Pin 

No.

Item

Condition

Voltage

value [V]

In case of high resistance such as single strand [V] *

1

Switch

Switch ON

Battery voltage

Lower than battery voltage Approx. 8 (Example)

Switch OFF

Approx. 0

Approx. 0

2

Lamp

Switch ON

Battery voltage

Approx. 0 (Inoperative lamp)

Switch OFF

Approx. 0

Approx. 0

MGI035A

Pin 

No.

Item

Condition

Voltage

value [V]

In case of high resistance such as single strand [V] *

1

Lamp

Switch ON

Approx. 0

Battery voltage (Inoperative lamp)

Switch OFF

Battery voltage

Battery voltage

2

Switch

Switch ON

Approx. 0

Higher than 0 Approx. 4 (Example)

Switch OFF

Approx. 5

Approx. 5

SAIA0255E

SERVICE INFORMATION FOR ELECTRICAL INCIDENT

GI-33

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• When using a DMM, be careful not to let test probes get close to

each other to prevent the power transistor in the control unit from
damaging battery voltage because of short circuiting.

• When checking input and output signals of the control unit, use the

specified check adapter.

SEF348N

GI-34

< SERVICE INFORMATION >

CONSULT-III/GST CHECKING SYSTEM

CONSULT-III/GST CHECKING SYSTEM

Description

INFOID:0000000001572193

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

(A) equipped on the vehicle side, it will communicate with the con-
trol unit equipped in the vehicle and then enable various kinds of
diagnostic tests.

• Refer to CONSULT-III Operation Manual for more information.

CONSULT-III Function and System Application*1

INFOID:0000000001572194

x: Applicable

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

1

: Instrument driver lower panel

JPAIA0066ZZ

Diagnostic test 

mode

Function

ENGINE

A/T

AI

R BAG

REAR

V

IEW CA

MERA

METER A/C 

AMP

BCM

AUT

O

 DRIVE 

POS.

ABS (I

ncluding 

VDC

)

IPDM

 E/R

ICC

ALL MO

DE 

A

W

D/4WD

INTELLI

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E

N

T

 KEY

LDW

Work support

This mode enables a technician to adjust some devices faster 
and more accurately by following the indications on CON-
SULT-III.

x

x

-

x

-

x

x

x

-

x

-

x

x

Self-diagnostic re-
sults

Self-diagnostic  results  can  be  read  and  erased  quickly.

x

x

x

-

x

x

x

x

x

x

x

x

x

Trouble diagnos-
tic record

Current self-diagnostic results and all trouble diagnostic 
records previously stored can be read.

-

-

x

-

-

-

-

-

-

-

-

-

-

Data  monitor

Input/Output  data  in  the  ECU  can  be  read.

x

x

-

x

x

x

x

x

x

x

x

x

x

CAN diagnosis 
support monitor

The  condition  of  CAN  communication  line  can  be  read.

x

x

-

-

x

x

x

x

x

x

x

x

x

Active test

Diagnostic Test Mode in which CONSULT-III drives some ac-
tuators apart from the ECUs and also shifts some parameters 
in a specified range.

x

-

-

-

-

x

x

x

x

x

x

x

x

DTC & SRT con-
firmation

The results of SRT (System Readiness Test) and the self-di-
agnosis status/result can be confirmed.

x

-

-

-

-

-

-

-

-

-

-

-

-

DTC work support

This mode enables a technician to monitor the status/results 
of self-diagnosis performed by the ECU.

x

x

-

-

-

-

-

-

-

-

-

-

-

ECU (ECM/TCM) 
part number

ECU (ECM/TCM) part number can be read.

x

x

-

x

-

x

x

x

-

x

x

x

x

ECU discriminat-
ed No.

Classification number of a replacement ECU can be read to 
prevent an incorrect ECU from being installed.

-

-

x

-

-

-

-

-

-

-

-

-

-

Function test

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

x

x

x

-

-

-

-

x

-

-

-

-

-

Configuration 

-

-

-

-

-

x

-

-

-

-

-

-

-

 

 

 

 

 

 

 

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