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Infiniti M35/M45 Y50. Manual - part 327

SYSTEM DESCRIPTION

BRC-9

[VDC/TCS/ABS]

BRC

Hydraulic Circuit Diagram

NFS000Q9

CAN Communication

NFS000QA

SYSTEM DESCRIPTION

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. Refer to

LAN-50, "CAN Sys-

tem Specification Chart"

SFIA3049E

BRC-10

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

PFP:00004

Fail-Safe Function

NFS000Q8

ABS, EBD SYSTEM

In the event there is a malfunction with the electrical system, the ABS warning lamp, VDC OFF indicator lamp,
and SLIP indicator lamp will turn on when it is the ABS that is malfunctioning, and the brake warning lamp,
ABS warning lamp, VDC OFF indicator lamp, and SLIP indicator lamp will turn on when it is the EBD that is
malfunctioning. At the same time, the VDC/TCS/ABS will be put in one of the following states by the fail-safe
function.

●

When the ABS malfunctions, only the EBD operates. The condition is the same as that of models without
VDC/TCS/ABS.

NOTE:
ABS self-diagnosis sound may be heard. This is normal condition because a self-diagnosis for “Ignition
switch ON” and “The first starting” are being performed.

●

When the EBD malfunctions, the EBD and ABS will not operate. The condition is the same as that of mod-
els without VDC/TCS/ABS and EBD.

VDC/TCS

In case of VDC/TCS system malfunction, the VDC OFF indicator lamp and SLIP indicator lamp or only VDC
OFF indicator lamp are turned on, and the condition of the vehicle is the same as the condition of vehicles
without VDC/TCS equipment. In case of electrical malfunction with the VDC/TCS system, the ABS control
continues to operate normally even though VDC/TCS does not operate.

CAUTION:

If the Fail-Safe function is activated, then perform self-diagnosis for VDC/TCS/ABS control system.

How to Perform Trouble Diagnoses

NFS000QB

BASIC CONCEPT

●

The most important point to perform trouble diagnosis is to understand systems (control and mechanism)
in vehicle thoroughly.

●

It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
they will be necessary to check symptom by driving vehicle with
customer.

CAUTION:

Customers are not professionals. Do not assume “maybe
customer means...” or “maybe customer mentioned this
symptom”.

●

It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.

●

After diagnostic, make sure to perform “ERASE MEMORY”.
Refer to

BRC-24, "ERASE MEMORY"

●

Always read “GI General Information” to confirm general precau-
tions. Refer to

GI-4, "General Precautions"

SEF234G

SEF233G