Hi,
I am not familiar with the 2.0 JTD engine, but by "Map" are you referring to the manifold pressure sensor. There is a mention of it in eLearn which places it "at the level of the air to air heat exchanger" (intercooler). This is reinforced by a diagram which seems to suggest that the sensor is connected to the hose between turbo and intercooler, via a small bore pipe. Hence look for any pipe connecting to the above hose, and try tracing back to the sensor.