FJ Cruiser 4WD V6-4.0L (1GR-FE) (2007)
Information Bus: Description and Operation
System Description
CAN Communication System
SYSTEM DIAGRAM
System Diagram
HINT: The skid control ECU stores DTCs and performs DTC communication by receiving information from the steering sensor and yaw rate sensor.
These sensors cannot store DTCs or perform DTC communication.
SYSTEM DESCRIPTION
1. BRIEF DESCRIPTION
a. The CAN (Control 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.
b. By pairing the CANH and CANL bus lines, the CAN performs communication based on differential voltages.
c. Many ECUs (sensors) installed on the vehicle operate by sharing information and communicating with each other.
d. The CAN has two 120 ohms resistors which are necessary to communicate with the main wire.
2. DEFINITION OF TERMS
a. Main wire
1. The main wire is a wire harness between the two terminus circuits on the bus (communication line). This is the main bus in the CAN
communication system.
b. Branch wire
1. The branch wire is a wire harness which diverges from the main wire to an ECU or a sensor.
c. Terminus circuit
1. The terminus circuit is a circuit which converts the communication current of the CAN communication into the bus voltage. It consists of a
resistor and condenser. Two terminus circuits are necessary on a bus.