CAN COMM Circuit

U1000 CAN COMM CIRCUIT

Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

U1000:

Diagnosis Procedure

INSPECTION PROCEDURE

1.CHECK CONNECTOR
1. Turn ignition switch OFF, disconnect the ABS actuator and electric unit (control unit) connector, and check the terminals for deformation, disconnection, looseness, and so on. If there is a malfunction, repair or replace the terminal.
2. Reconnect connector and perform self-diagnosis.
Is "CAN COMM CIRCUIT" displayed in self-diagnosis display items?
YES >> Print out the self-diagnostic results, and refer to LAN-14, "Trouble Diagnosis Flow Chart". Diagnosis and Repair Workflow
NO >> Connector terminal is loose, damaged, open, or shorted.

Special Repair Requirement

1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the steering angle sensor when replacing the ABS actuator and electric unit (control unit). Refer to BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION: Description". Testing and Inspection
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2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit). Refer to BRC-9, "CALIBRATION OF DECEL G SENSOR: Description". Service and Repair
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