Automatic Transmission

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 CAN COMM CIRCUIT" with CONSULT or 12th judgement flicker without
CONSULT is detected when TCM cannot communicate to other control units.


Possible Cause

Harness or connector (CAN communication line is open or shorted.)


DTC Confirmation Procedure


CAUTION:
If performing this "DTC Confirmation Procedure" again, always turn ignition switch OFF and wait at least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT

1.Turn ignition switch ON.
2.Select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
3.Touch "START".
4.Wait at least 6 seconds or start engine and wait for at least 6 seconds.
5.If DTC is detected, go to .

WITH GST

Follow the procedure "WITH CONSULT".

WITHOUT CONSULT

1.Turn ignition switch ON.
2.Wait at least 6 seconds or start engine and wait at least 6 seconds.
3.Perform self-diagnosis. Automatic Transmission.
4.If DTC is detected, go to .


Wiring Diagram - AT - CAN







TCM TERMINALS AND REFERENCE VALUES

Automatic Transmission.


Diagnosis Procedure


1. CHECK CAN COMMUNICATION CIRCUIT

1.Turn ignition switch ON and start engine.
2.Select "SELF-DIAG RESULTS" mode for "TRANSMISSION" with CONSULT.
Is any malfunction of the "U1000 CAN COMM CIRCUIT" indicated?
YES- Print out CONSULT screen, Go to LAN section. CAN System Specification Chart.
NO-INSPECTION END