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Infiniti M35/M45 Y50. Manual - part 1141

TIRE PRESSURE MONITORING SYSTEM

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DISPLAY UNIT

Display the air pressure of each tire.

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After the ignition switch is turned ON, the pressure values are
not be displayed until the data of wheels stabilizes.

Can Communication

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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.
For details, refer to

LAN-50, "CAN System Specification Chart"

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TROUBLE DIAGNOSES

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How to Perform Trouble Diagnoses

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BASIC CONCEPT

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

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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 the customer mentioned this
symptom”.

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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.

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Always diagnosis, make sure to perform “ERASE MEMORY”.

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

GI-4, "General Precautions"

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