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  #41  
Old 24-10-2017, 05:30 PM
Richard L Richard L is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

If you probe test point 5, let me know the voltage:
1. pre-crank
2. idling
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  #42  
Old 27-10-2017, 04:48 AM
MiztahSparklez MiztahSparklez is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

Quote:
Originally Posted by Richard L View Post
If you probe test point 5, let me know the voltage:
1. pre-crank
2. idling
Hmm this seems wrong, test point 5 is reading battery voltage. 12v
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  #43  
Old 27-10-2017, 07:00 AM
Richard L Richard L is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

My mistake, test point 17. Sorry.
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  #44  
Old 27-10-2017, 08:51 AM
MiztahSparklez MiztahSparklez is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

.76v accessory
.87-.88v engine idle (edit: seems like it's .94v after a few minutes of idling. My analog boost gauge reads -19.9psi)

Voltage does climb slightly with throttle position.

Last edited by MiztahSparklez; 27-10-2017 at 08:54 AM.
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  #45  
Old 30-10-2017, 08:06 AM
Richard L Richard L is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

This seemed to be a bit on the low side. What is the operating range of the MAP sensor?

a 2-bar MAP sensor should read approximately 1.8V precrank.
a 3-bar map sensor should read approximately 1.3V pre-crank.
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  #46  
Old 30-10-2017, 10:29 AM
MiztahSparklez MiztahSparklez is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

Quote:
Originally Posted by Richard L View Post
This seemed to be a bit on the low side. What is the operating range of the MAP sensor?

a 2-bar MAP sensor should read approximately 1.8V precrank.
a 3-bar map sensor should read approximately 1.3V pre-crank.
Hmm might be part of my problem. The sensor is supposed to be 2.5 bar. The voltage output goes from 0-5v according to the same document I found the bypass information in. Wonder if I tapped the wire for temperature and not pressure. The map sensors have both boost and temperature built in.
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  #47  
Old 31-10-2017, 09:38 AM
Richard L Richard L is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

this makes sense.
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  #48  
Old 13-11-2017, 12:59 AM
MiztahSparklez MiztahSparklez is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

Hey Richard,

I have found that my car actually has yellow with gray stripe wiring for the map sensors post charger. These are found on the right side harness #9 when counting from the right on top and #8 when counting from right on bottom. This is in line with the image below. I was able to test continuity of the wires to verify. I will solder again to one of these wires and test out my activation.

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  #49  
Old 15-11-2017, 10:04 AM
Richard L Richard L is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

I am confused with you pin location. Two ECU compartments: 60 pin and 94 pin.

Tell me which compartment and pin#. Once located, I will check for you.
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  #50  
Old 15-11-2017, 06:57 PM
MiztahSparklez MiztahSparklez is offline
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Default Re: Hfs-4 wiring for Audi B8 s4 3.0 (2009-2013)?

Quote:
Originally Posted by Richard L View Post
I am confused with you pin location. Two ECU compartments: 60 pin and 94 pin.

Tell me which compartment and pin#. Once located, I will check for you.
Pin 86 and pin 75. 86 appears to be passenger side map, 75 is driver side. Both wires are yellow with gray stripe. 94 pin side

I believe the temperature wire was the yellow with light blue stripe (this was reading .8-.9v when at idle).

Last edited by MiztahSparklez; 15-11-2017 at 07:01 PM.
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