Transmission Control System

DTC U1000 CAN COMMUNICATION LINE

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 units transmits/receives data but selectively reads required data only.
Remarks: Specification data are reference values.





TCM TERMINALS AND REFERENCE VALUES

On Board Diagnosis Logic
Diagnostic trouble code CAN COMM CIRCUIT or U1000 with CONSULT-II or 12th judgement flicker without CONSULT-II is detected when the ECM-A/T communication line is open or shorted.

Possible Cause
Check harness or connector. (CAN communication line is open or shorted.)

Diagnostic Trouble Code (DTC) Confirmation Procedure





After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-II
1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Wait at least 6 seconds or start engine and wait for at least 6 seconds.

WITHOUT CONSULT-II








1. Turn ignition switch "ON".
2. Wait at least 6 seconds or start engine and wait at least 6 seconds.
3. Perform self-diagnosis. Refer to TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS). Without Scan Tool

Wiring Diagram








AT-CAN-01

1 Of 2:

2 Of 2:

Diagnostic Procedure