DTC U0311 (123): MCM and BCM Program Version Mismatch: General Description

Fig 1: Motor Control Module And Body Control Module Communication Diagram

The motor control processor and the battery control processor softwares which are in the motor control module (MCM) can be updated by software rewriting device connected via the F-CAN lines, When both processors need to be updated but either processor fails rewriting, the indicator comes on and stores a DTC. Each processor stores a program version information, and compare their versions each other by transmitting/receiving via the internal serial communication. If the motor control processor judges that its own software version is old, a malfunction is detected and a DTC is stored.