Test 1: Check CAN Bus. (General Test Information)

Check CAN bus. (General test information)

If several fault codes regarding CAN communication have occurred, the following causes of the fault are likely
- Open circuit in voltage supply to the control modules involved
- Short circuit or open circuit of CAN wires
- Connector sleeves of the CAN bus

If CAN communication between control module ME motor electronics and at least one other control module is fault-free, there is no fault at the CAN element of the control module ME motor electronics. In this case proceed as follows:
- Read fault memory of control module to which there is a fault in the communication. If a CAN fault regarding communication with control module ME motor electronics is present in this control module, then first of all test CAN lines between the two control modules.