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 HOW TO DIAGNOSE THE CAN BUS LINE
).
CAUTION:
Whenever the ECU is replaced, ensure that the CAN bus lines are normal.