SYSTEM 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.
Scheme 78
Scheme 79
Scheme 80
Scheme 81
Scheme 82
Scheme 83
- When there are no indications of BCM, METER A/C AMP, AUTO DRIVE POS. or IPDM E/R on SELECT SYSTEM display of CONSULT-II, print the SELECT SYSTEM.
- Print all the data of SELF-DIAG RESULTS for ENGINE, A/T, BCM, METER A/C AMP, ABS, AUTO DRIVE POS., and IPDM E/R displayed on CONSULT-II.
- Print all the data of DATA MONITOR (CAN DIAG SUPPORT MNTR) for ENGINE, A/T, BCM, METER A/C AMP, ABS, AUTO DRIVE POS, and IPDM E/R displayed on CONSULT-II.
- Attach the printed sheet of SELECT SYSTEM, SELF-DIAG RESULTS and DATA MONITOR (CAN DIAG SUPPORT MNTR) onto the check sheet. Refer to «CHECK SHEET»(ref-179062-S04593839292005062900000) .
- Based on the indications of SELECT SYSTEM and the results of DATA MONITOR (CAN DIAG SUPPORT MNTR), put marks V onto the items with No indication, NG, or UNKWN in the check sheet table. Refer to «CHECK SHEET»(ref-179062-S04593839292005062900000) . NOTE: If NG is displayed on CAN COMM as DATA MONITOR (CAN DIAG SUPPORT MNTR) for the diagnosed control unit, replace the control unit. The DATA MONITOR (CAN DIAG SUPPORT MNTR) items, which are not in check sheet table, are not related to diagnostic procedure on service manual. So it is not necessary to check the status of DATA MONITOR (CAN DIAG SUPPORT MNTR) items which are not indicated in check sheet table.
- Check CAN communication line of the integrated display system. Refer to «CAN COMMUNICATION»(ref-179060) .
- Attach the CAN DIAG MONITOR check sheet onto the check sheet. Refer to «CHECK SHEET»(ref-179062-S04593839292005062900000) .
- Mark the NG or UNKWN item of the check sheet table with V from the result of CAN DIAG MONITOR check sheet. Refer to «CHECK SHEET»(ref-179062-S04593839292005062900000) . NOTE: If NG is displayed on CAN COMM as CAN DIAG MNTR for the diagnosed control unit, replace the control unit. Refer to «CAN COMMUNICATION»(ref-179060) .
- According to the check sheet results (example), start inspection. Refer to «CHECK SHEET RESULTS (EXAMPLE)»(ref-179062-S18006732722005062900000) .
