CVT

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 malfunction 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.




On Board Diagnosis Logic
- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "U1000" with CONSULT-III is detected when TCM cannot communicate to other control units.




Possible Cause
Harness or connectors
(CAN communication line is open or shorted.)




DTC Confirmation Procedure

NOTE:
If "DTC Confirmation Procedure" has been previously performed, always turn ignition switch OFF and wait at least 10 seconds before performing the next test.
After the repair, touch "ERASE" on "SELF-DIAG RESULTS" and then perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Start engine and wait for at least 6 seconds.
4. If DTC is detected, go to SEE Diagnosis Procedure .

WITH GST
Follow the procedure "WITH CONSULT-III".




Wiring Diagram - CVT - CAN






TCM TERMINALS AND REFERENCE VALUES
CVT Trouble Diagnosis.




Diagnosis Procedure
Go to Trouble Diagnosis Flow Chart.