Hi all, I need a hand a 2009 ford kuga 2.0 tdci engine code G6DG, the radiator fan regulator was faulty and the radiator fan wouldn't engage, I fitted a new fan complete with electronic regulator, now it starts and after a while the climate compressor unhooks and the fan stops with error p0691 Fan circuit 1 low signal, I have carried out numerous checks, fuses, regulator power supply, oscilloscope on fan control signal but nothing, ne doubt I managed to get a second regulator, the new regulator on both original and new fan, same fault.

the regulator signal works on 4.2v I don't know if this is normal.