5AT RE5R05A

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 or 17th judgment flicker without 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, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1. Turn ignition switch ON.
2. Select "SELF-DIAG RESULTS" in "TRANSMISSION".
3. Touch "START"
4. Start engine and wait for at least 6 seconds.
5. If DTC is detected, go to 5AT RE5R05A.

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




Wiring Diagram - AT - CAN









Diagnosis Procedure
1.CHECK CAN COMMUNICATION CIRCUIT
With CONSULT-III
1. Turn ignition switch ON and start engine.
2. Select "SELF-DIAG RESULTS" in "TRANSMISSION".
Is the "U1000" indicated?
YES - GO TO LAN section. Refer to CAN System Specification Chart.
NO INSPECTION END