P0866

DTC P0866 TCM COMMUNICATION CIRCUIT HIGH

1. OUTLINE OF DIAGNOSIS
Detect open or short circuit in AT diagnosis line.
Judge NG when the AT diagnosis input line signal remains High.

2. COMPONENT DESCRIPTION
Data frame as "Start signal (Low_40 ms + High_20 ms) ->Data ->End signal" is transmitted every approx. 1 second.




3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE
Perform diagnosis during the vehicle running.

5. DIAGNOSTIC METHOD




Judge NG when the continuous time until completing the malfunction criteria becomes more than the time needed for diagnosis (3 seconds). Judge OK and clear NG when the malfunction criteria are not completed.

6. DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed

7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed

8. FAIL SAFE
None

9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)