CAN Communication System
NETWORKING: CAN COMMUNICATION SYSTEM: SYSTEM DIAGRAM
* *1: w/ Smart Key System
* *2: w/o Smart Key System
* *3: w/ VDIM
* *4: for AWD
* *5: w/ Dynamic Radar Cruise Control System
* *6: w/ HID Headlight System
* *7: w/ Pre-collision System
* *8: w/ Parking Assist Monitor System
* *9: w/ Intuitive Parking Assist System
* *10: w/ Power Back Door
* *11: w/ Power Slide Door
* *12: w/ Memory
* *13: for Power Seat with Memory
HINT
The skid control ECU detects and stores steering sensor and yaw rate sensor DTCs and performs DTC communication by receiving information from the steering sensor and yaw rate sensor.
SYSTEM DESCRIPTION
1. BRIEF DESCRIPTION
(a) 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, 250 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 2 resistors of 120 Ohms 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 2 termination 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 sensor.
(c) Termination circuits
(1) The termination circuit is a circuit which converts the communication current of the CAN communication into the bus voltage. It consists of a resistor and condenser. 2 termination circuits are necessary on a bus.
(d) CAN junction connector
(1) The CAN junction connector is designed so that it can be used with CAN communication which has a termination circuit and CAN communication which does not have a termination circuit.
3. CIRCUIT DESCRIPTION
(a) The V bus, movement control bus and MS bus each have termination circuits with resistance of 120 Ohms x 2. High speed communication at 500 kbps and 250 kbps is possible.
4. ECUS OR SENSORS WHICH COMMUNICATE VIA CAN COMMUNICATION SYSTEM
(a) ECM
(b) Power management control ECU*1
(c) Network gateway ECU*2
(d) Main body ECU
(e) Certification ECU (smart key ECU)*1
(f) Master cylinder solenoid (skid control ECU)
(g) Steering angle sensor
(h) Yaw rate sensor*3
(i) Air conditioning amplifier
(j) Center airbag sensor assembly
(k) Steering column assembly (Power steering ECU)
(l) 4WD control ECU*4
(m) Combination meter
(n) Driving support ECU*5
(o) AFS ECU (headlight swivel ECU)*6
(p) Seat belt control ECU*7
(q) Parking assist ECU*8
(r) Clearance warning ECU*9
(s) Power back door unit (back door ECU)*10
(t) Slide door motor unit (slide door ECU)*11
(u) Outer mirror control ECU*12
(v) Position control ECU and switch*13
*1: w/ Smart Key System
*2: w/o Smart Key System
*3: w/ VDIM
*4: for AWD
*5: w/ Dynamic Radar Cruise Control System
*6: w/ HID Headlight System
*7: w/ Pre-collision System
*8: w/ Parking Assist Monitor System
*9: w/ Intuitive Parking Assist System
*10: w/ Power Back Door
*11: w/ Power Slide Door
*12: w/ Memory
*13: for Power Seat with Memory
5. DIAGNOSTIC CODES FOR CAN COMMUNICATION SYSTEM
(a) DTCs for the CAN communication system are as follows: U0100, U0101, U0104, U0122, U0123, U0124, U0126, U0128, U0129, U0140, U0142, U0151, U0155, U0182, U0199, U0200, U0201, U0202, U0208, U0327, U1002, U1104, U1100, U1104, U1110, U1133, U110B, B1499, B2799, C1203 and C1437.
6. NOTES REGARDING TROUBLESHOOTING
(a) Trouble in the CAN bus (communication line) can be checked through the DLC3 (except when there is a wire break in the branch wire of the DLC3).
(b) DTCs regarding the CAN communication system can be checked using the Techstream.
(c) The CAN communication system cannot detect trouble in the branch line of the DLC3 even though the DLC3 is also connected to the CAN communication system.
7. HOW TO DISTINGUISH CAN JUNCTION CONNECTOR CONNECTOR
(a) In the CAN communication system, the shape of all connectors connected to the CAN junction connector is the same.
The connectors connected to the CAN junction connector can be distinguished by the colors of the bus line and the connecting side of the connector.
HINT
See "Terminals of ECU" CAN Communication System for bus line color or the type of connecting surface.