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  #1  
Old 07-04-2017, 10:28 PM
VeightTT VeightTT is offline
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Default Map sensor or lack of?

Hi, I have had my HFS-4 (3.1) system installed (professional install) in my '13 Audi S6 for a few months now and I have never been able to get a smooth flow on the gauge, after extensive testing this week I discovered that the system is not reading any boost signal. I took it back to the installer to make sure all the wires are hooked up properly and it look like they are. My car is running 20psi the board is still configured at its default setting of 3.5bar. with the board configured to trigger off MPS should I still be registering at least some flow on the gauge? or is the 3.5bar to far out of range to pick up the signal?
if triggering off IDS with the system not reading any boost should it still behave as expected? Or is the lack of boost signal throwing everything off? I still have a few questions but I will leave it at this one for now.
The car is a 4.0 twin turbo with 2 1cc jets installed post intercooler one in each intake tract.

I appreciate any help
Cheers
Andrew

Last edited by VeightTT; 07-04-2017 at 10:34 PM.
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  #2  
Old 08-04-2017, 06:20 AM
Richard L Richard L is offline
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Default Re: Map sensor or lack of?

1. What is the engine code of your car.
2. Which wiring diagram did your professional installer use?
3. What is the serial number of the HFS4
4. What is the name of your installer?
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Old 08-04-2017, 07:18 AM
VeightTT VeightTT is offline
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Default Re: Map sensor or lack of?

Hi Richard

1 CEUC
2 I believe it was for a C7 RS6 which he was told was the same ECU, wiring etc.
3 121750
4 Driver source (U.S)

The only other thing I can tell you is that the Map sensor (blue wire) is hooked up to ECU pin 47 per the wiring diagram.

Cheers
Andrew

Last edited by VeightTT; 08-04-2017 at 07:31 AM.
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  #4  
Old 08-04-2017, 06:36 PM
Richard L Richard L is offline
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Default Re: Map sensor or lack of?

This is correct pin 47 fore the G71 Map sensor.

Can you check the MAP sensor voltage on testing #17 at:

1. pre-crank
2. idling
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  #5  
Old 08-04-2017, 11:20 PM
VeightTT VeightTT is offline
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Default Re: Map sensor or lack of?

Testing at #17?
If that involves removing stuff in the engine bay to get to other stuff to test then unfortunately that is not something I am able to do, that will require booking the car in to have it tested and that will likely take some time. Also it would be helpful if you could tell me what I (they) should be looking for and what to change if not correct so it can be done in one trip to save time (and money).
Is there anything thing that would be helpful to you in the mean time? I can data log boost pressure, absolute, specified etc, etc. via VCDS and send you the logs.
Should the system be able to run of IDC correctly in the absence of boost signal?

Cheers
Andrew
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  #6  
Old 09-04-2017, 06:20 AM
Richard L Richard L is offline
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Default Re: Map sensor or lack of?

The voltage is from the controller box. Should be in the glove compartment.

In order for me to help you, you really need to access the controller now and in the future. At the moment, I cannot help you any one of your question until I know what the settings are.
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Old 09-04-2017, 07:40 AM
VeightTT VeightTT is offline
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Default Re: Map sensor or lack of?

Yes of course I can access the controller you just need to tell me where to put the multi meter to test for the voltage etc. the back of the board 3.5bar default?

Cheers
Andrew
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Old 09-04-2017, 02:40 PM
Richard L Richard L is offline
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Default Re: Map sensor or lack of?

There are thirty test points on the controller. Do you have a user manual you can get the infos from?
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Old 09-04-2017, 08:56 PM
VeightTT VeightTT is offline
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Default Re: Map sensor or lack of?

yes I have a user manual
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Old 10-04-2017, 05:54 PM
Richard L Richard L is offline
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Default Re: Map sensor or lack of?

go to page 10.5

Pin 17 is the raw signal from the map sensor. (blue wire of the grey harness)
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