CAN Communication System - Diagnostics: Overview Toyota Sequoia I рестайлинг

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1. BUS LINE REPAIR After repairing the bus line with solder, wrap the repaired part with vinyl tape. NOTE: The CANL bus line and CANH bus line must be installed together all the time. When installing, make sure to twist them. CAN bus lines are likely to be influenced by noise if the bus lines are not twisted. The difference in length of the CANL bus line and CANH bus line should be within 100 mm (3.937 in.). Leave approximately 80 mm (3.150 in.) loose in the twist around the connector. Do not use a bypass wire between the connectors. NOTE: The feature of the twisted wire harness will be lost if you use a bypass wire.
2. CONNECTOR HANDLING When inserting tester probes into a connector, insert them from the rear of the connector. If it is impossible to check continuity from the rear of the connector, then use a repair wire to check the connector.
3. PRECAUTION FOR DISCONNECTING THE BATTERY CABLE NOTE: When disconnecting the battery terminal, initialize the following system after the terminal is reconnected. DIAGNOSIS PROCEDURE System Name Refer To Back Door Power Window Control System «ADJUSTMENT»(/toyota/sequoia/i-2004-2007/remont/windows/#back-door-power-window-control-system__adjustment)

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HINT

1. The ECM uses the CAN communication system to perform DTC communication instead of the conventional serial communication line (SIL).
2. The translate ECU outputs DTCs only via the BRAKE warning light. Therefore, the DTCs cannot be checked on the hand-held tester display via the CAN VIM.

SYSTEM DESCRIPTION

1. BRIEF DESCRIPTION The CAN (Controller Area Network) is a serial data communication system for real time application. It is an in-vehicle multiplex communication system that has a high communication speed (500 kbps) and the function to detect malfunctions. By pairing the CANH and CANL bus lines, the CAN performs communication based on differential voltage. Many ECUs (sensors) installed in the vehicle operate by sharing information and communicating with each other. The CAN has two resistors of 120 ohm which are necessary to communicate with the main bus line.
2. DEFINITION OF TERMS Main bus line The 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. Sub bus line The sub bus line is a wire harness that diverges from the main bus line to the ECU.
3. ECUs THAT COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM Translate ECU Suspension Control ECU ECM
4. DIAGNOSTIC CODE FOR CAN COMMUNICATION SYSTEM DTCs for the CAN communication system are as follows: U0100/65, U0122/67, U0132/72, 65, 94. HINT: If C1201/51, C1202/52 or C1203/53 is output from skid control ECU, perform troubleshooting of each diagnosis code (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-227568-S16176075672006040600000) ).
5. REMARK FOR TROUBLESHOOTING Trouble in the CAN bus (communication line) can be checked from the DLC3 (except when there is a wire break in lines other than the sub bus line of the DLC3). NOTE: Do not insert the tester directly into the DLC3 connector. Be sure to use a service wire. The CAN communication system cannot detect trouble in the sub bus line of the DLC3 even though the DLC3 is also connected to the CAN communication system.
6. HOW TO DISTINGUISH THE CAN J/C CONNECTOR In the CAN communication system, all connectors connected to the CAN J/C are the same shape. The connectors connected to the CAN J/C can be distinguished by the colors of the bus lines. HINT: See "TERMINALS OF ECU" (see «TERMINALS OF ECU»(ref-227583-S07523168202006040600000) ) for bus line colors.

See also:
• ADJUSTMENT