SYSTEM DESCRIPTION
1. 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) The V bus has a termination circuit with a resistor of 60 Ω, and the bus 2, bus 3, bus 5 and sub bus 1 each have termination circuits with two resistors of 120 Ω.
2. DEFINITION OF TERMS
(a) Main bus
(1) The main bus is a wire harness between the two terminating resistors on the bus. This is the main bus in the CAN communication system.
(b) Branch
(1) A branch is a wire harness which diverges from the main bus to an ECU or sensor.
(c) Terminating resistors
(1) Two resistors of 120 Ω are installed in parallel across the ends of the CAN main bus lines. They are called terminating resistors. These resistors allow the changes of the voltage differential between the CAN bus lines to be accurately judged. To allow proper function of CAN communication, it is necessary to have both terminating resistors installed. Since the two resistors are installed in parallel, this results in a measurement of approximately 60 Ω.
3. CIRCUIT DESCRIPTION
(a) The V bus has a termination circuit with a resistor of 60 Ω.
(b) The bus 2, bus 3 and bus 5 each have termination circuits with two resistors of 120 Ω.
4. TROUBLESHOOTING REMARKS
(a) DTCs for the CAN communication system can be checked using the Techstream. The DLC3 is connected to the CAN communication system, but no DTCs exist regarding problems in the DLC3 or the DLC3 branch lines. If there is a malfunction in the DLC3 or the DLC3 branch lines, ECUs on the CAN cannot output DTCs to the Techstream.
5. DIAGNOSTIC TROUBLE CODES FOR CAN COMMUNICATION SYSTEM
HINT:
See Diagnosis System.
Click here
6. HOW TO DISTINGUISH CONNECTOR OF CAN JUNCTION CONNECTOR
(a) In the CAN communication system, the shape of connectors connected to the CAN junction connector which has a ground terminal are the same. The connectors connected to the CAN junction connector can be distinguished by the colors of the bus lines and the connecting side of the junction connector.
HINT:
See Terminals of ECU for bus line color or the shape of connectors.
Click here
Dtc Check / Clear
DTC CHECK / CLEAR
1. CHECK DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
(e) Check for DTCs.
2. CLEAR DTC
(a) Connect the Techstream to the DLC3.
( ...
Main Body ECU Vehicle Information Reading/Writing Process Malfunction (B15F6)
DESCRIPTION
This DTC is stored when items controlled by the main body ECU cannot be customized
via the navigation system vehicle customization screen.
HINT:
The main body ECU controls the items for the following systems that are customizable
via the navigation receiver assembly screen:
...
Inspection
INSPECTION
PROCEDURE
1. INSPECT BRAKE CYLINDER AND PISTON
(a) Check the cylinder bore and piston for rust and scoring.
2. INSPECT PAD LINING THICKNESS
(a) Using a ruler, measure the pad lining thickness.
Standard thickness:
11.5 mm (0.453 in.)
Minimum thickness:
1.0 mm (0.0394 in.) ...