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:

DTC CONFIRMATION PROCEDURE

1.RECHECK DTC

With CONSULT-III
1. Turn the ignition switch from OFF to ON.
2. Perform 4WAS main control unit self-diagnosis.
Is DTC "U1000" detected?
YES >> Proceed to diagnosis procedure. Refer to "Diagnosis Procedure".
NO >> INSPECTION END

Diagnosis Procedure

1.PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
Perform 4WAS main control unit self-diagnosis.
Is DTC "U1000" detected?
YES >> Perform CAN diagnosis.
NO >> INSPECTION END.

Special Repair Requirement

BEFORE REPLACING 4WAS MAIN CONTROL UNIT
^ Record the self-diagnosis results (history).

CAUTION:
^ Never erase the memory (history) of self-diagnosis results when replacing 4WAS main control unit after diagnosis.
^ Erase the memory of the self-diagnosis results (record) after printing out or recording all the values of "DATA MONITOR".