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Home › Toyota › 2008 › Corolla LE, Automatic › Repair and Diagnosis › External Pages › Different car › Section 45 (Can Communication System) › Can Communication System › System Description

System Description

WARNING: This page is about a different car, the 2007 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
  1. BRIEF DESCRIPTION 
    1. The CAN (Controller Area Network) is a serial data communication system for real time application. It is a vehicle multiplex communication system which has a high communication speed (500 kbps) and the ability to detect malfunctions.
    2. The CAN performs communication based on the differential voltage by pairing the CANH bus wire and CANL bus wire.
    3. Many ECUs (sensors) installed on the vehicle operate by sharing information and communicating with each other.
    4. The CAN has two resistors of 120 Ω on the main bus that are necessary for communication.
  2. DEFINITION OF TERMS 
    1. Main bus
      1. The main bus is composed of a pair of CAN main bus wires that run between the two 120 ft terminating resistors. The bus carries communications on the CAN.
    2. Branch bus
      1. A branch bus (sub-bus) is composed of a pair of CAN branch wires (sub-bus lines) that are connected to the CAN main bus wires.
    3. Bus line
      1. In this chapter, "bus line" is used to refer to either the CAN bus or an individual CAN bus wire (or wires).
  3. COMPONENTS WHICH COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM 
    1. Combination Meter ECU
    2. Skid Control ECU
    3. Yaw Rate Sensor
    4. Steering Sensor
    5. ECM
  4. DIAGNOSTIC CODES FOR THE CAN COMMUNICATION SYSTEM 
    1. DTCs for the CAN communication system are as follows: U0073/94, U0100/65, U0123/62, U0123/63, U0124/95
  5. REMARKS FOR TROUBLESHOOTING 
    1. Trouble in the CAN bus (communication line) can be checked from the DLC3 (except a wire break other than in the DLC3 sub bus line).
    2. By using the intelligent tester, DTCs for the CAN communication system can be checked through the DTC ISO 9141 K-Line.
    3. The CAN communication system cannot detect trouble in the DLC3 sub bus line even though the DLC3 is also connected to the CAN communication system.
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