October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

DTC C1640: Variant Code Un-Writing/Data Abnormal: Notes

CAUTION: If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines. (Refer to TROUBLE CODE DIAGNOSIS ).

CAUTION: Whenever the ECU is replaced, ensure that the CAN bus lines are normal.