The CTS in under the manifold in the same area as the thermo time switch.

There should be no green plug and there should also be a brown for the thermo time switch.

Can you get any photos of the area and can you see if there is any wiring which has been cut back and taped up (possibly for the brown thermo time switch). Check that the green plug hasn't been peiced onto the wiring for the thermo time switch. Someone might have been bodging!!