Connect CAN High from the screen harness to CAN High on your ECU, and CAN Low to CAN Low. Use a twisted pair for the run and keep it away from ignition leads and high current cables.
CAN is a differential pair. It rejects interference only while the two wires stay twisted together. Untwisting the last 300 mm to make a neat loom is the most common cause of intermittent data dropouts in a performance car.
Annotated diagram of the E-10 harness connector, CAN High and CAN Low pins labelled on the image, with the twisted pair run to the ECU shown.
E-10 harness CAN High and CAN Low wire colours and pin numbers, and the CAN bit rate published for each supported ECU.
⚠️ Never tap CAN into a live bus while the ignition is on. Cut power first. A short between CAN High and 12V can take out the ECU transceiver, not just the screen.
Related: CAN Bus Termination and the 120 Ohm Resistor · How to Add a New ECU Connection · My Screen Turns On but Shows No ECU Data
