Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: 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 GTS.

(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 GTS.
  • 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.

NOTICE:

Gateway function not equipped ECU is a generic name for ECUs not connected to the central gateway ECU (network gateway ECU) with a gateway function.

(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.

    READ NEXT:

     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 Procee

     Utility

    UTILITY INITIALIZE THE CONNECTION INFORMATION OF A GATEWAY FUNCTION EQUIPPED ECU (BUS MONITOR ECU) (a) Initialize the ECU. Body Electrical > Central Gateway > Utility Tester Dis

     Diagnosis System

    DIAGNOSIS SYSTEM NOTICE: The following communication bus check screen is provided only as an example. This screen differs from the actual screen for this vehicle. Description of "Communicati

    SEE MORE:

     Installation

    INSTALLATION CAUTION / NOTICE / HINT COMPONENTS (INSTALLATION) Procedure Part Name Code 1 DIFFERENTIAL SIDE GEAR SHAFT DUST COVER LH 41336M - - 2

     Garage door opener

    The garage door opener can be programmed using the HomeLink to operate garage doors, gates, entry doors, door locks, home lighting systems, security systems, and other devices. System components The HomeLink wireless control system in your vehicle has 3 buttons which can be programmed to operate 3 d

    © 2020-2024 Copyright www.tcorollacross.com