Transmission Control System
DTC U1000 CAN COMMUNICATION LINEDescription
Controller Area Network (CAN) 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 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 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".
Wiring Diagram-AT-CAN
AT-CAN-01:
AT-CAN-01
Diagnostic Procedure
1. CHECK CAN COMMUNICATION CIRCUIT
With CONSULT-II
1. Turn ignition switch "ON" and start engine.
2. Select "A/T" with "SELF-DIAG RESULTS" mode in CONSULT-II.
3. The "CAN COMM CIRCUIT" is detected.
Yes or No?
Yes >> Print out CONSULT-II screen, GO TO LAN-4, "Precautions When Using CONSULT-II". Precautions When Using CONSULT-II
No >> INSPECTION END