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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 635 (CAN COMMUNICATION SYSTEM - DIAGNOSTICS)SYSTEM DESCRIPTION
2004 Toyota Matrix XR, FWD, Standard

System Description

2004 Toyota Matrix XR, FWD, StandardSECTION System Description
WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
  1. BRIEF DESCRIPTION 
    1. 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 malfunction.
    2. The CAN performs the communication based on the differential voltage by pairing the CANH bus line and CANL bus line.
    3. The CAMRY uses the CAN communication system for communication between the following ECU and sensors in the ABS with EBD & BA & TRAC & VSC system.
    4. The CAN has two resistors of 120 ohms that are necessary for communication to the main bus line.
  2. DEFINITION OF TERMS 
    1. Main bus line
      1. Main bus line is a wire harness between the two terminus circuits on the bus (communication line). This is the main bus in the CAN communication system.
    2. Sub bus line
      1. Sub bus line is a wire harness which diverges from the main bus line, which is the main bus of the CAN bus, to an ECU or sensor.
  3. ECU OR SENSORS WHICH COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM 
    1. Skid Control ECU
    2. Yaw Rate Sensor
    3. Steering Sensor
  4. DIAGNOSTIC CODES FOR THE CAN COMMUNICATION SYSTEM 
    1. DTCs for CAN system are as follows:

      U0121/94, U0123/62, U0124/95, U0126/63

  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 hand-held tester, DTCs for the CAN communication system can be checked through the DTC ISO 9141K-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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