Hi, got a potential buyer for my saph but yet again the car knows she is going and has broken

I have got a Ford 5 pin diagnostic code reader, but were is the port located on the car?. I have found a plug with 3 wires on it right at the ECU connector is this it?

The code reader says ford 5 pin, yet there is only 3 wires coming out of the reader?

I'm a bit confused can anyone help please

Bri.