Toyota CH-R Service Manual: System Description

SYSTEM DESCRIPTION

BRIEF DESCRIPTION

(a) The Controller Area Network (CAN) is a serial data communication system for real time application. It is a vehicle multiplex communication system which has a high communication speed and the ability to detect malfunctions.

(b) Using the CANH and CANL bus lines as a pair, CAN communication is performed using a voltage differential. (A base voltage is applied to the pair of lines and a voltage differential is created when communicating.)

(c) Many ECUs or sensors installed to the vehicle operate by sharing information and communicating with each other.

(d) 2 resistors which are necessary for communication are used in a CAN bus main line.

DEFINITION OF TERMS

(a) Central bus

(1) The central bus is a term used to describe all buses directly connected to the central gateway ECU (network gateway ECU).

HINT:

A bus is displayed as Bus on the "Communication Bus Check" screen of the Techstream.

(b) Sub bus

(1) A sub bus is a bus that has a gateway function equipped ECU in order to communicate with the central bus and other sub buses.

HINT:

  • A sub bus is displayed as Sub bus on the "Communication Bus Check" screen of the Techstream.
  • When Sub bus is selected on the "Communication Bus Check" screen, ECUs and sensors connected to non-CAN networks such as LIN may also be displayed in addition to the ECUs and sensors connected to sub buses in the CAN network.

(c) Local bus

(1) A local bus is a bus that does not have the ability to communicate with other buses. ECUs and sensors on a local bus can only communicate with other ECUs and sensors on the same bus.

(d) CAN J/C

(1) A CAN junction connector is a connector that connects branch lines to a main bus.

(e) Main bus

(1) A main bus line is the wire harness that runs between the 2 terminating resistors of a bus.

(f) Branch

(1) A branch line is a wire harness that connects an ECU or sensor to a main bus line.

(g) Terminating resistors

(1) Terminating resistors which maintain a stable signal inside the CAN bus are installed. 2 resistors of 120 Ω each located at each end of the bus are necessary.

    System Diagram
    SYSTEM DIAGRAM (a) The CAN communication system is composed of 5 buses. *A w/ Blind Spot Monitor System - - CAN Main Bus Line ...

    How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT PRECAUTIONS WHEN TROUBLESHOOTING NOTICE: Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to ...

    Other materials:

    Toyota CH-R Owners Manual > Steps to take in an emergency: If a warning light turns on or a warning buzzer sounds
    Calmly perform the following actions if any of the warning lights comes on or flashes. If a light comes on or flashes, but then goes off, this does not necessarily indicate a malfunction in the system. However, if this continues to occur, have the vehicle inspected by your Toyota dealer. Warn ...

    Toyota CH-R Service Manual > K114 Continuously Variable Transaxle Fluid: Replacement
    REPLACEMENT CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed, installed, or replaced during the CVT fluid replacement are shown below. Necessary Procedure After Parts Removed/Installed/Re ...

    © 2017-2019 Copyright www.tochr.net
    0.0235