A/T Communication Line

Description
The ECM and TCM provide mutual communication in relation to engine output control signal (ignition timing retard signal) during rapid standing starts/acceleration. With this consistent real-time control, the shifting feel is substantially improved.

TCM TERMINALS AND REFERENCE VALUE





Remarks: Specification data are reference values.

On Board Diagnosis Logic
Diagnostic trouble code A/T COMM LINE with CONSULT-II or 11th judgment flicker without CONSULT-II is detected when the ECM-A/T communication line is open or shorted.

Possible Cause
Check harness or connector.

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).





Wiring Diagram - AT - LAN





TCM TERMINALS AND REFERENCE VALUE (MEASURED BETWEEN EACH TERMINAL AND 25 OR 48 (TCM GROUND)

Diagnostic Procedure

Step 1:

Step 2:

Step 3:

Step 4:

Step 5: