Trip computer fuel consumption calculator backwards.

[AlvinCitroenC5]

Hi,
Because the factory RED LCD trip computer screen on top of the radio in my 407 was broken, I had someone from the junk yard sold me a high resolution blue screen.

However, I realized now that the fuel calculator is now calcuating the fuel consumption in reverse. Ex:. When I let off the throttle, the fuel consumption increases, while when I full throttle, fuel consumption decreases.

There is also a radio fault code that cannot be cleared in Diagbox/Lexia.

I suspect that the VSS may be a different signal? I wonder if there's a solution for this, such as switching the pins around on the display? The strange part is that the new display causes the same fuel calculation and output on the tiny screen in the dashboard also.

Thanks for any possible solution and suggestions.

[xantia_v6]

The display in the picture seems to be indicating km/l, rather than l/100km, which your old display may have been set for. Some markets (e.g. Japan) seem to prefer this. I don't know if this is software configurable or is fixed in hardware.

[Paul-R]

The choice between litres/100 km, km/litre and miles/gallon are user choice on both my C5 and 308. I think it's in the settings somewhere.

What is the error code for the radio fault? Did it appear when you changed the display? Does the radio actually work correctly?