Sorry I don't have diagram or know wire colour.
If you can get to wires at back of fan relay you can see the wire colours.
Check to find out which connections are battery voltage with ignition on , one is solenoid + , the other is power for fan motor. You should have two wires left ;one goes to the fan motor the remaining wire goes to ecu.
If using meter to check for continuity between relay socket and ecu disconnect the battery negative and unplug the ecu connector from the ecu that way there is no chance of damaging ecu and unplug the relay from its socket
It is possible that the relay has lost its 12volts to solenoid that would have same effect as faulty wire to ecu
If you can get to wires at back of fan relay you can see the wire colours.
Check to find out which connections are battery voltage with ignition on , one is solenoid + , the other is power for fan motor. You should have two wires left ;one goes to the fan motor the remaining wire goes to ecu.
If using meter to check for continuity between relay socket and ecu disconnect the battery negative and unplug the ecu connector from the ecu that way there is no chance of damaging ecu and unplug the relay from its socket
It is possible that the relay has lost its 12volts to solenoid that would have same effect as faulty wire to ecu