CDL3 Problem on Mitsubishi Evo X

[Kam]

Hi,
I'm having an issue with a CDL3 in a Mitsubishi Evolution X,
If the CDL3 connector is in place, I can't connect to the M800 ecu and the Fan is On and when the engine starts/runs the Tacho RPM Needle goes from 1200 rpm to 0, OEM Cluster beeps and this problem stays even if I unplug the 2 CAN Wires from the back of the connector

ECU and Tacho run fine only when I remove the connector from the CDL3
Is the unit defective or I need to upload a certain configuration to get rid of this problem ?

Regards

[David Ferguson]

Has this ever worked, and it's a new problem?

Or is this a new installation of the CDL3 into the vehicle with an existing M800 installation?

Where did the wiring for the CDL3 come from?

You may need to share your M800 and CDL3 configurations for us to be able to offer any help.