575 M external temperature sensor

I wouldn't think that the external temperature sensor would have a fuse. What kind of issue are you having. The temperature sensor should be located in the left outside mirror (the plastic bump on the bottom).

Brian Brown
San Francisco Motorsports

 

If the HVAC system is similar to the F550's I believe the HVAC ECU supplies power to the sensor, so the whole HVAC system would be dead if the applicable fuse failed.

Unfortunately, we haven't been able to get much wiring information on this system. Here's a diagram we pieced together for the 550.... still under construction.

Engine Systems and HCAC

Note that splice 239 provides power to the outside temperature sensor, the sun radiation sensor and the left bank water temperature sensor. I'm not sure if there is any easy way to check the voltages on these items.

 

No temperature data on 575M TPMS.

 

Yes

 

It might be an HVAC ECU or power problem. Looking at the diagrams, I see there are quite a number of power sources supplying the HVAC system (ECU, etc). e.g. the HVAC fuse in the passenger footwell (fuse 20 on the 550). There are also some fuses bolted(?) to the right hand side of the evaporator unit. Not sure how hard they are to get to on these cars.

 

575M TPMS reset does not require an SD2 or equivalent if that is what you are asking. Can be recalibrated either by the driver using the little button and driving her or by a tech with an SD2. Both work fine, but the latter does not require driving afterwards. Procedure is in the OM.

 

Seems like this fuse has the same function as the 550's. Could you try disconnecting the plug on the water pump and see if a new fuse stays unblown. Don't run the system for too long.

I'm not sure how hard it is to get to the plug:

https://www.ricambiamerica.com/car-diagrams/ferrari/v12/gt-group-2-seat/575m/air-conditioning-system.html

The pump is item 13. Some 550 diagrams seem to show it located aft of the wheel arch(?)

 

If the pump is the problem, it seems to be a standard Bosch item. Part number 0392020034?

https://www.amazon.com/Bosch-0392020034-Engine-Auxiliary-Electric/dp/B0068MUDE2

 

That's the auxiliary booster pump, used for circulating coolant through the heater core, and it's known to fail on 550's. As Ian suggested, disconnect it at its connector and see if the fuse holds. I would think you could safely run the car without it until you get a replacement, but you just won't have good cabin air temperature regulation with the HVAC system.

 

Thanks, Terry. I wasn't sure how the system would react without water flow (hence my warning)

Fuel pumps and water pumps tend to draw a lot of current if they're about to fail and I've seen them melt plastic fuse holders before they blow fuses, making repairs more difficult. It's good that the fuse has blown first.

Can the pump be changed without losing too much coolant (requiring a system bleed)? I guess the pipes can be clamped if they are not too old and still flexible?

 

Ooops... Thanks John

The red car in the profile pic fooled me

Looking at the diagram in the link above, does the hot water come from the manifold in the centre of the engine "V" into the pump via the axial pipe and exit from the right angle pipe to the hot water valve, through the aircon unit and back out to the coolant tank?

 

Anthony- Number 13


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I don't know if this any help...

https://www.ferrarichat.com/forum/posts/144951797/

Looks like some panels have been removed. I see a suspension component. Could it be behind the wheel arch panel? I would get confirmation before pulling the car to pieces.

I see the change involved changing the endcap of the pump (because the inlet/outlet nozzles were the wrong size on the new pump). Might it be easier just to unscrew the body of the pump from the endcap and not worry about undoing the hoses?

This process is not as easy as I thought it might be.

 

Anthony, as Ian mentioned, the pump is located behind the right side wheel arch, so the wheel arch panel does require to be removed to access it. It's not too bad to access - only 3-4 screws to remove. Sorry, but no pics.

I did elect to replace my Bosch pump with a Johnson pump because when I began my search, I found various threads on other car forums about the advantages of the Johnson over the Bosch.

Here's a pic of the Bosch by itself, showing the connector:

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Here's a pic of the Johnson & Bosch, side by side, for comparison:

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And yes, You'll probably lose some coolant and will have to bleed the system afterward.

 

Yes Ian, that's how it's routed.

 

Looks like you already got your question answered, because mine works fine so no photos.

 

Excellent. Thanks for the location photo. I'm not surprised you couldn't initially find the pump.

I wonder what all those other connectors are for. They don't seem to be in the 550 photograph.