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 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 "CAN COMM CIRCUIT" with CONSULT-II or U1000 without CONSULT-II 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-II





1. Turn ignition switch "ON". (Do not start engine.)
2. Select "A/T" with "DATA MONITOR" mode in CONSULT-II.
3. Start engine.
4. Drive vehicle and maintain the following condition for at least 6 seconds. SLOT LVR POSI: "D" position
5. If DTC is detected, go to "Diagnostic Procedure" below.

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

AT-CAN-01:

AT-CAN:

Wiring Diagram-AT-CAN

Diagnostic Procedure
1. CHECK CAN COMMUNICATION CIRCUIT
With CONSULT-II
1. Turn ignition switch "ON" and start engine.

AT-CAN:

2. Select "SELF-DIAG RESULTS" mode for "A/T" with CONSULT-II.
Is any malfunction of the "CAN COMM CIRCUIT" indicated?
Yes >>Print out CONSULT-II screen, GO TO LAN section.
Refer to LAN-7 "CAN COMMUNICATION" Description and Operation.
No >>INSPECTION END