Emtron ETC4. Emtron Thermocouple Controller (ETC) Emtron CAN based thermocouple module allows for up to 4 channels of thermocouple data to be send via CAN back to the ECU. This data can be used to trim individual cylinders or to monitor other components in high temperature environments. The module is made billet aluminum, DR25 covered tefzel and terminated to DT connectors ensuring reliability in the most extreme motorsport environments.