B5 2.7T to B6 A4 Wiring guide

[blitz2190]

I was going to take this down due to ungrateful morons, but thanks the the appreciation of the community and because I don't want to take it away because of one moron, I will leave it be

for 2.7T APB into B6 chassis, experimental for B7 A4

Wiring Should be accurate as of 2/8/17 for the B7 A4 thanks to Ali SC3 for testing.

This information was pieced together from elsawin diagrams and AudiA4_20T's thread http://www.audizine.com/forum/showth...ness-Explained

Will Work for all b6 Chassis if done the recommended way, and now B7 A4's as a direct wire harness, a jumper harness requires slightly different wiring.

WARNING THIS IS FOR MANUAL CARS ONLY, auto's require more wiring and have not been covered as of yet

Read all the post pertaining to the part of the swap you are doing (engine or abs), if you have a question read it again before asking, using nothing other than whats provided here the car will run.

Known B7 issues:

ABS needs to be retrofitted(see bottom of the post for wiring)

The dash has 2 issues, first is the oil level sensor, this should be fixable with an B7 RS4 or A4 Sensor(same part) as it has the right readings for the dash and same shape as the 2.7

The second dash issue is the close fuel cap message, this is thought to be fixed with a b6 ccm(still being tested), Update only works with switching the cluster out for a b6 one.

Alternatively you can fit a b6 cluster and fix both issues.

Signal	S4(A6) APB	B6 Chassis	B7 A4	NOTES
Throttle Pedal	T15(T15e) WHITE Pin5 grey	T17e WHITE Pin1 brown/green	T17e WHITE Pin1 brown/green
Throttle Pedal	T15(T15e) WHITE Pin2 yellow/Violet	T17e WHITE Pin2 yellow/violet	T17e WHITE Pin2 yellow/violet
Throttle Pedal	T15(T15e) WHITE Pin3 brown/red	T17e WHITE Pin3 brown/red	T17e WHITE Pin3 brown/red
Throttle Pedal	T15(T15e) WHITE Pin1 yellow/blue	T17e WHITE Pin4 yellow/blue	T17e WHITE Pin4 yellow/blue
Throttle Pedal	T15(T15e) WHITE Pin4 grey/yellow	T17e WHITE Pin5 grey/yellow	T17e WHITE Pin5 grey/yellow
Throttle Pedal	T15(T15e) WHITE Pin6 brown/green	T17e WHITE Pin6 brown	T17e WHITE Pin6 brown
Brake Light Switch	T15(T15e) WHITE Pin11 red/black	T17e WHITE Pin11 red/black	T17b GREEN Pin6 red/black	Wire must be run from the ecu harness to the Left kick panel under the dash On B7 Chassis where this connection Is Quick connect terminal Recommended
Brake Vacuum Vent Valve	T15(T15e) WHITE Pin12 white/red	T17e WHITE Pin12 white/red	T17d RED Pin12 white/red
Clutch Vacuum Vent Valve Switch	T15(T15e) WHITE Pin13 red/green	T17e WHITE Pin13 red/green	T17d RED Pin9 green/grey
Connection (crash signal) in instrument panel wiring harness	T3au(T3au) RED Pin2 violet/blue	T17d RED Pin6 violet/blue	T17j BROWN Pin14 violet/blue	THIS IS AN AIR BAG CONNECTION note *2
CAN BUS -Low	T15m(T15u) RED Pin14 orange/brown	T17d RED Pin13 orange/brown	T17e WHITE Pin13 orange/brown
CAN BUS -High	T15m(T15u) RED Pin15 orange/black	T17d RED Pin14 orange/black	T17e WHITE Pin14 orange/black
Starter Wire	T10(T10o) BROWN Pin4 red/black	T10a BROWN Pin4 red/black	t17j BROWN Pin16 red/black
K-diagnostic Wire	T10(T10o) BROWN Pin1 green/black	T10a BROWN Pin6 green/red	T17d RED Pin13 green/red
Oil Level Thermal Sensor	T10(T10o) BROWN Pin8 black/red	T10a BROWN Pin2 black/red	T17e WHITE Pin17 black/red
Oil Level Thermal Sensor	T10(T10o) BROWN Pin9 red/gray	T10a BROWN Pin9 red/gray	T17e WHITE Pin9 red/grey
D23 - Connector (over fuse 229)	T10ar(T10n) ORANGE Pin1 red/green	T10 BLACK Pin5 red/green	t17d RED Pin17 green	* see additional note #6 for b7
D22 - Connector (over fuse 234)	T10ar(T10n) ORANGE Pin8 green/yellow	T10a BROWN Pin8 green/yellow	t17d RED Pin15 black/blue
Injectors	T10ar(T10n) ORANGE Pin5 black/blue	T10a BROWN PIN 1 red/blue T17e WHITE Pin15 black/violet	see note *1 section B7	*1
Alternator/Generator	T10m(T10p) BLACK Pin1 blue	T10 BLACK Pin1 Blue	T17e WHITE Pin11 blue
Oil Pressure Switch	T10m(T10p) BLACK Pin3 white/grey	T10 BLACK Pin3 white/grey	T17d RED Pin6 white/grey
Sensor Ground	T10m(T10p) BLACK Pin5 brown/yellow	T10 BLACK Pin6 brown/yellow	T17e WHITE Pin10 brown/yellow
Engine Coolant Level (ECL) Warning Switch	T10m(T10p) Black Pin7 blue/yellow	T10 BLACK Pin7 blue/yellow	T17d RED Pin2 blue/yellow
Fuel Pump (FP) Relay(also Powers fuses for injectors)	T10m(T10p) BLACK Pin8 red/blue	T17d RED Pin10 red/blue	T17j BROWN Pin12 red/violet
Engine Coolant Temperature (ECT) Sensor	T10m(T10p) BLACK Pin9 blue/brown	T10 BLACK Pin9 blue/brown	t17d RED Pin3 blue/brown
Speedometer Vehicle Speed Sensor	T10m(T10p) BLACK Pin10 brown/red	T10 BLACK Pin10 brown/red	n/a see additional connections	Not on 2003+ see additional connections
Leak Detection Pump	T10ar(T10n) ORANGE Pin6 white/yellow	T17d RED Pin1 white/yellow	T17d RED Pin4 yellow
Leak Detection Pump	T10ar(T10n) ORANGE Pin7 yellow/red	T17d RED Pin2 grey/red	T17d RED Pin5 grey/red

notes:
*1
--------------------------------------------
These are wired this way to provide the correct fused amperage connections needed to be as close to factory as possible

B6 Chassis

1) find where the pin 3 from the ecu ties together with the injector harness (near the ecu box rubber boot) and cut it separating pin 3 from the injectors.
2) pin 3 from ecu goes to T17e WHITE Pin15
3) the main black/blue injector wire should tie into T10a BROWN Pin1 for a fused connection that turns on with the ecu fuel pump relay signal.
4) T17e WHITE Pin16 red/grey needs a 12v good current feed, run an 14 gauge wire from post 30 to one side of a relay and then from the other to T17e WHITE Pin16, trigger the relay from the same one that is used with ECU pin3 which is T17e WHITE Pin15, see below picture

B6_PowerRelay.jpg
the reason for this way is the ecu can now work correctly and cut power to the injectors in case of a problem.


*2
-------------------------------------------
air bag crash signal can be found at T12i (black plug) pin 8 lilac/blue on the ccm in 03+ models.




B7 A4

1) find where the pin 3 from the ecu ties together with the injector harness (near the ecu box rubber boot) and cut it separating pin 3 from the injectors.
2) pin 3 then goes to t17e WHITE Pin17 along with the Oil Level Thermal Sensor wire(fused power for sensors).
3) you will need to add an inline 20amp fuse and a relay that is triggered from the ecu, using the same line that trigger the fuel pump module T17j BROWN Pin12 red/violet.
4) Supply the above relay with an appropriate gauge wire attached to post 30 power supply, and the other side connects to the injector wire you seperated(the thicker black/blue). the reason for this is the ecu can now work correctly and cut power to the injectors in case of a problem. see image below

B7_InjectorRelay.jpg

5) The B7 will also need a switched supply to t17j Brown Pin1 red/grey, I recommend at least an 14 gauge wire supplied from post 30 through a relay triggered from t17e WHITE Pin17 for a total of 3 wires needing to be connected to this pin. see below image

B7_PowerRelay.jpg

6) finally the b7 also needs a switched power on the T17d Red pin 1 green/yellow and t17d RED Pin 17 green(along with above connections), this can be done the same way as the two relays above, the trigger can be from the same pin t17e WHITE Pin17 or one of the other relays powered from it. use a 20amp fuse to supply 2 relays or a 30-40 amp with suitable 40 amp relay to power both.

--------------------------------------------

Additional Connections: (THESE ARE NEEDED FOR BOTH B6 and B7)

Run from the plug you adapted to the 2.7T harness

1) 12v+ post 30(nut in plenum chamber) to ecu pin 62 red (T10m BLACK pin4 red on 2.7T plug)I RECOMMEND A 10AMP FUSE INLINE

2) T17d RED Pin5 blue/brown - to A/C Compressor (3.0 or 1.8T compressor required other side of the plug from the compressor goes to ground)

a)need a way to trigger the codensor fan, a second pressure switch tee'ed into the condenser from an c5 a6 or b5 s4/a4 should work(Currently developing a trigger for the stock sensor that should eliminate the need for any other sensors being added)

3) Vehicle Speed Sensor 5k limit

A4 1.8T 2003+ - Run a wire from T17b GREEN (in the kick panel drivers footwell, left hand side for RHD cars) Pin17(B6) or Pin9(B7) white/blue to T10 brown Pin3(2.7T plug), I suggest a quick disconnect for easy harness removal

Starter Interlock Relay
coming soon should you want to retain this functionality. 3/15/07

Quick and easy fan wiring for those asking

2.7B6Fans.jpg


*********** ADDED 08/06/2015 Thanks to kristof for testing on his car ***********************
b7 ABS 8.0 to 5.7 swap

This needs to be done to retain abs in a B7 because the 2.7 ecu (apb) only communicates with the abs controller through the k-line, which is not present on the 8.0 controller

items needed

5.7 abs module and pump(with attached g201 brake pressure sensor)
B6 master cylinder to abs lines
5.7 module plug do not cut the wires going to the brake pressure sensor take it with them(with good size lead if not re-pinning and plan to crimp)
g202 yaw rate sensor (behind the stereo head unit)

Bosch 8.0		Bosch 5.7
pin 25 red/lilac	fuse s242	pin 6 red/lilac
pin 32 black/brown	A20 S7	pin 23 black/brown
pin 13 brown	ground 26	pin 1 brown
pin 38 brown	ground 26	Pin 5 brown
pin 31 blue/brown	g44-	pin 30 blue/brown
pin 19 blue	g44+	pin 31 blue
pin 18 black	g45-	pin 15 black
pin 6 yellow	g45+	pin 16 yellow
pin 33 green/yellow	g46+	pin 29 green/yellow
pin 20 yellow	g46-	pin 14 yellow
pin 34 black	g47-	pin 28 black
pin 22 green	g47+	pin 12 green
pin 26 orange/black	A121 Can high	pin 24 orange/black
pin 14 orange/brown	A122 Can low	pin 40 orange/brown
pin 36 white/blue	A27 vss	pin 33 white/blue
pin 11 black/red	cluster t32/16	pin 17 black/red
pin 16 grey/red	cluster t32/22	pin 20 grey/red
pin 30 red/black	A18 F(brake light switch)	pin 32 red/black
pin 8 white/red	F47(Brake Pedal switch)	pin 37 white/red
pin 4 black/green	pin 6 E132(Anti-Slip Control Switch)	pin 27 black/green
	G201 Brake pressure(on 5.7 pump)
	yellow/black	pin 25 yellow/black
	yellow/green	Pin 26 yellow/green
	red/white	Pin 42 red/white
	G202 Yaw rate Sensor(behind head unit in b6)	note this must be oriented the same way as it was originally
	white/black	pin 39 white/black
	white/lilac	Pin 21 white/lilac
	white/green	Pin 9 white/green
	green/black	Pin 8 green/black
	white/yellow	Pin 10 white/yellow
	white	Pin 41 white
	K-line	connect to t10a/6 in ecu plenum(same wire as 2.7t ecu connection)

[JAYINH]

nice, this will be helpful- subscribed

[AudiA4_20T]

please don't mislead people with this.

B6 4.2 =/= B6 1.8T =/= B6 3.0

Both wires and power wiring are different...

I'm all about helping people but this is not that simple.

[blitz2190]

please don't mislead people with this.

B6 4.2 =/= B6 1.8T =/= B6 3.0

Both wires and power wiring are different...

I'm all about helping people but this is not that simple.

oh, from reading the post i Thought the difference where what i posted in then notes for the 3.0 and 1.8t, and I wasn't including the 4.2 as this was for b6 a4, but if there are any other differences that you can list I'll gladly add them as the information right now is very hard to find, also maybe you could explain my first question under "Still needs work" as i didn't want to post misinformation

[AudiA4_20T]

oh, from reading the post i Thought the difference where what i posted in then notes for the 3.0 and 1.8t, and I wasn't including the 4.2 as this was for b6 a4, but if there are any other differences that you can list I'll gladly add them as the information right now is very hard to find

you might want to say if your B6 table is for 1.8T or 3.0. This could be helpful but I'm reluctant because people are going to end up just asking ridiculous questions because they don't know what they're doing

[blitz2190]

you might want to say if your B6 table is for 1.8T or 3.0. This could be helpful but I'm reluctant because people are going to end up just asking ridiculous questions because they don't know what they're doing

changed to make it clearer

and sorry edited my last post while your where typing im guessing

[jaydeff]

Just wondering, is there also a wiring difference between auto/manual and APB/BEL? Great info though this will definitely help me when I get into swapping.

[nefkntym]

Just wondering, is there also a wiring difference between auto/manual and APB/BEL? Great info though this will definitely help me when I get into swapping.

Yes, and the wiring from an Allroad is different as well.

[blitz2190]

Yes, and the wiring from an Allroad is different as well.

do you know the differences, keeping in mind this is just to be able to swap the motor so should only list the differences pertaining to those wires involved, I want to compile as much as possible to be able to actually answer questions like this in one thread

[nefkntym]

I don't remember, I did my swap 2 years ago. I just remember some pins being in different spots and some of the colors were different.

This was for the engine harness.

[AudiA4_20T]

do you know the differences, keeping in mind this is just to be able to swap the motor so should only list the differences pertaining to those wires involved, I want to compile as much as possible to be able to actually answer questions like this in one thread

The problem is that there's also not just 1 way to do this. Like fan/AC wiring will change depending on the way you want to wire it.

[nefkntym]

The problem is that there's also not just 1 way to do this. Like fan/AC wiring will change depending on the way you want to wire it.

Agreed, I didn't even wire my fuel pump like stock, far from it.

[blitz2190]

The problem is that there's also not just 1 way to do this. Like fan/AC wiring will change depending on the way you want to wire it.

What way would A be easier, or B be as close to stock functionality, preferably the latter

[blitz2190]

also AudiA4_20T any chance you could clear up those three questions under "still needs work"?

[AudiA4_20T]

1. Pin 14 triggers the clutch relay. That's where it needs to go. The vacuum vent valve switch is different.

2. Pin 5 goes to the AC Compressor.

3. No idea what all that means but if you have a 2002 you need to just loop T10/10 to the white/blue pin 3. Otherwise if you have 2003+ you have to route the wire from the kickpanel up to avoid the 5k rev cut issue

[blitz2190]

thank you very much ill update it, also I'd like to eventually get it to a point where this could be helpful for all a4's 02-05 1.8t & 3.0, and the clutch relay = clutch starter relay correct?

[diagnosticator]

It is essential that whoever is doing the wiring knows how to read and understand the wiring diagrams. Only by comparing wiring diagrams between the two cars involved with the swap will any of this make sense. Being able to understand the wiring diagrams will answer practically any questions that come up.

[dougyfresh]

It is essential that whoever is doing the wiring knows how to read and understand the wiring diagrams. Only by comparing wiring diagrams between the two cars involved with the swap will any of this make sense. Being able to understand the wiring diagrams will answer practically any questions that come up.

/\
What AudiA4_20T was basically saying.

It is not a cookie cutter task. It takes knowledge of wiring diagrams to be successful.

[blitz2190]

Good point, I've gone through the diagrams and to most they would be hard to follow, they are some of the worst I've seen when compared to most I've used from on demand , so I thought this may make them easier for anyone reading for this info and things they may miss, if they are attempting the swap they should have a fair amount of mechanical knowledge if not it's a bad place to start.

[Bische]

One more tip for people doing swaps: Pay close attention to HOW the ECU is powered, it varies between applications.

Also, the J17 is not just a fuel pump relay - it is a fuel deliver relay as it powers the fuel pump/injectors/MAF. This is done as a safety precaution, and different conditions(like airbag = blown) is prohibiting J17 triggering. Again, this also varies from applications and will likely cause confusion.

[blitz2190]

One more tip for people doing swaps: Pay close attention to HOW the ECU is powered, it varies between applications.

Also, the J17 is not just a fuel pump relay - it is a fuel deliver relay as it powers the fuel pump/injectors/MAF. This is done as a safety precaution, and different conditions(like airbag = blown) is prohibiting J17 triggering. Again, this also varies from applications and will likely cause confusion.

This is the reason I wanted to start this, tips like this that may be missed in the diagram

[blitz2190]

1. Pin 14 triggers the clutch relay. That's where it needs to go. The vacuum vent valve switch is different.

2. Pin 5 goes to the AC Compressor.

3. No idea what all that means but if you have a 2002 you need to just loop T10/10 to the white/blue pin 3. Otherwise if you have 2003+ you have to route the wire from the kickpanel up to avoid the 5k rev cut issue

from what i can see on the diagram why not just run T10/10 to T10m/10 like in the table or do this as well as loop to the T10/3? also would you happen to have the page 14 for the 2003+ models mine is from a 2002 diagram?

[AudiA4_20T]

from what i can see on the diagram why not just run T10/10 to T10m/10 like in the table or do this as well as loop to the T10/3? also would you happen to have the page 14 for the 2003+ models mine is from a 2002 diagram?

I know you're trying to get out of having to buy a Bentley manual but please do. It's $70 and will help you tremendously

[blitz2190]

i Have a manual unfortuantly it looks like mine was for the 2002 wiring diagram, or maybe not a complete manual its from the po. I'll most likely end up getting one before the swap to cover all my bases as I already have the one for the 2.7 as well

[blitz2190]

edit found the correct wire 17b/17 in the footwell green connector

[B6T]

I know you're trying to get out of having to buy a Bentley manual but please do. It's $70 and will help you tremendously

Or...

www.alldatadiy.com

Costs $16/car. For $32 I have all documentation for both the A4 and the A6.

[blitz2190]

Or...

www.alldatadiy.com

Costs $16/car. For $32 I have all documentation for both the A4 and the A6.

To be honest I got them from OnDemand from our shop, dunno why I didn't before.

[f1torrents]

use discount code "diy2014" and get 6 months for 6.95 or a year for 9.99

[B6T]

To be honest I got them from OnDemand from our shop, dunno why I didn't before.

On Demand only tells you the wire colour and not the connector location or the wire gauge... which is risky.

[blitz2190]

On Demand only tells you the wire colour and not the connector location or the wire gauge... which is risky.

You have the online or the disks? The one I used had quite a few diagrams, they mostly look like the Bentley ones from the b5 one I have.

[B6T]

Online.

It was too simplified... made me nervous. I'm happy with the Alldata website.

[blitz2190]

Online.

It was too simplified... made me nervous. I'm happy with the Alldata website.

I may have to try it as the disk subscription is overpriced

[AudiA4_20T]

edit found the correct wire 17b/17 in the footwell green connector

What is that wire for?

[blitz2190]

after re-reading both the diagrams wouldn't "T10n ORANGE Pin5 black/blue to T17e WHITE Pin15 black/violet (note*2)" also work with T10n ORANGE Pin5 black/blue to T10a Pin 1 red/blue? or is that common a ground instead of positive?

[blitz2190]

updated the wiring the only thing I'm having trouble finding in the diagrams is where to hook the wire to control the a/c, is it just striaght to one side and ground the other on the ac connector?. Anyone know this?

[AudiA4_20T]

after re-reading both the diagrams wouldn't "T10n ORANGE Pin5 black/blue to T17e WHITE Pin15 black/violet (note*2)" also work with T10n ORANGE Pin5 black/blue to T10a Pin 1 red/blue? or is that common a ground instead of positive?

it depends how you want to wire things. Which thing do you want to power coils? Which to power injectors? Which to power ECU? How do you want to do the A/C? Are you using the 2.7T or 3.0 Compressor?

[blitz2190]

What is that wire for?

thats the white/blue wire in the kick panel for 2003+

[DxC]

thread delivers!

[blitz2190]

thread delivers!

Everything working well?

[B6T]

I have detailed wiring for a BEL from a 2003 tiptronic A6 into a 2004 AVK 3.0L A4 which I will upload later.

Specifics about my swap:
- I simply re-pinned my engine harness using the existing 2.7t plugs. Because of some of the position changes I needed to splice a different end onto the wire so that it would fit the correct receptacle in the plug (wider vs more narrow)
- My speedometer and tachometer required no additional wires. I don't have a 5k rev cut problem.
- Because I used a tiptronic engine, the harness did not have the plug for the reverse sensor on the transmission so I had to steal it from the existing 3.0L harness and fabriate a sub-harness.
- The engine harness was also lacking the correct A/C compressor wire so I had to run those as well.
- As of right now, the rad fans are not working. I opted to use the original 3.0L fans and control module, but that we before I realized that the A6/2.7t fan module actually controls the auxiliary coolant pump under the intake manifold.
- I'm unsure at this point whether cruise control works or not. There was a single common wire between the two cars, and the A4 uses a "Steering Column Control Module" whereas the A6 has four or so wires running directly between the ECU and the cruise control stalk.

More to come later.