Anyone know where the white/black strip & the brown wire goes from the fan switch? The haynes BOL shows that the fan switch connects to the fan directly & the other side is a feed, this isn't the case. I suspect that at least one wire connects to the ECU.
Sorry, posted before adding more info. The problem with the car is it struggles to start & won't idle. In comparision with my mates car, the brown wire was grounded, mine wasn't. Grounding this wire cures the problem & the car runs fine. I suspect the fan swich input was constantly on, confusing the ECU. I daren't connect the connecter back to the fan switch though, as if the fan switch comes on, I don't know if shorting the other wire (white/black) would damage the ECU. I think I'll leave the brown wire connected to earth & manually wire the fan through a 30A relay. Any thoughts.
From what I remember, the fan switch is not connected to the ECU. The only thing it connects to is the fan, and switches it directly.
A brown wire on a ford would indicate an earth wire, so there's every possibility you've got an earthing problem, which is affecting other sensors.
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.