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Old 07-07-2020, 03:09 AM   #1
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Anyone have a 2.5L Wiring Diagram?

I'm trying to track one down to help with an Audi 4.2L swap.



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Old 07-07-2020, 08:12 AM   #2
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I'll plan to scan pages for the '97 tonight and pm you a link. Have you decided on which 4.2L yet?
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Old 07-07-2020, 09:40 AM   #3
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I'll plan to scan pages for the '97 tonight and pm you a link. Have you decided on which 4.2L yet?
Wow, that would great! I bought a 2004 A8 motor, itíll be here Friday. The wiring is really worrying me, the fuel pump, and electric pedal look straight forward but I canít find any information for the ignition signal. Still digging.
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Old 07-07-2020, 09:51 AM   #4
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I think '04 was a transition year for the A8. Does it have the belt or chain timing?
This may be useful if you don't already have it:
https://12v.org/urs/The%20V8-5V%20engine%20SSP%20921903%20.pdf
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Old 07-07-2020, 10:07 AM   #5
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I think '04 was a transition year for the A8. Does it have the belt or chain timing?
This may be useful if you don't already have it:
https://12v.org/urs/The%20V8-5V%20engine%20SSP%20921903%20.pdf
Thanks, I was fortunate enough to find that already. Oddly it also doesnít mention anything about ignition (Starting the car). I bought a timing belt car. What motor did you put in yours?
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Old 07-07-2020, 06:21 PM   #6
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... What motor did you put in yours?
I have started and stopped the swap a few times and never completed it. I have an AUX engine from an '03 A8 that is currently sitting in a 2000 S, partly wired and no plumbing done. I have a 32 valve ABZ engine from a '98 A8 on my garage floor with the harness removed and partly mated to an '01 Tiptronic base. Both projects became less urgent than other projects and were set aside.

Now I'm thinking the AUX will go in the '01 Tiptronic and the ABZ should go in a 914 ...for next years project list.
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Old 07-07-2020, 07:25 PM   #7
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I think '04 was a transition year for the A8. Does it have the belt or chain timing?
This may be useful if you don't already have it:
https://12v.org/urs/The%20V8-5V%20engine%20SSP%20921903%20.pdf
Do you know if there is one of these for a 2.7TT ? I have two friends and myself that are going with the 2.7TT. The wiring is what is keeping me from moving forward with the swap. I already have the engine, cayman 6 speed and modified axles
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Old 07-07-2020, 08:01 PM   #8
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Last edited by 78F350; 07-14-2020 at 08:15 AM. Reason: no longer relevant
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Old 07-09-2020, 07:45 AM   #9
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Wow, that would great! I bought a 2004 A8 motor, itíll be here Friday. The wiring is really worrying me, the fuel pump, and electric pedal look straight forward but I canít find any information for the ignition signal. Still digging.
Are you trying to use the Porsche ECU with the Audi engine? When I did my 4.2 build the ignition wiring was pretty straight forward, but I used the Audi ECU. If you keep the Audi ECU & engine together, there is no additional wiring needed for injectors.
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Old 07-10-2020, 12:50 PM   #10
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Are you trying to use the Porsche ECU with the Audi engine? When I did my 4.2 build the ignition wiring was pretty straight forward, but I used the Audi ECU. If you keep the Audi ECU & engine together, there is no additional wiring needed for injectors.
Iím using both ECUs. The Audi ecu to run the engine and fuel pump and the Boxster unit for the chassis. Thatís the plan at least...
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Old 07-11-2020, 09:23 AM   #11
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Ok - you are talking about the starter wiring! Very easy. The main power line that hooks in to the alternator and runs from the front of the car coonnects to the large starter terminal. You need to run a wire from pin 1 of connector x59 (large white connector in the trunk) to the starter small terminal.
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Old 07-11-2020, 09:27 AM   #12
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Do you know if there is one of these for a 2.7TT ? I have two friends and myself that are going with the 2.7TT. The wiring is what is keeping me from moving forward with the swap. I already have the engine, cayman 6 speed and modified axles
Hey Woody, the Bentley manual for the A6 covers the 2.7tt 2000-2004. Let me know if there is anything in particular you need and i can shoot it to you.
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Old 07-14-2020, 04:24 AM   #13
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Hey Woody, the Bentley manual for the A6 covers the 2.7tt 2000-2004. Let me know if there is anything in particular you need and i can shoot it to you.
I appreciate the offer but I'll need to buy my own when the time comes for the swap. I do have a question about the immobilizer though. Were you able to get rid of it?
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Old 07-14-2020, 08:12 AM   #14
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If you are using the Audi ECU for engine management, the Boxster's immobilizer is irrelevant.
Look at this for basic info on immobilizer delete on the Audi ECU: Reading/writing/cloning your immobilizer: A beginners guide.
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Old 07-16-2020, 10:04 AM   #15
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I appreciate the offer but I'll need to buy my own when the time comes for the swap. I do have a question about the immobilizer though. Were you able to get rid of it?
The Audi Immo is pretty trivial to bypass. Free software and instructions available on the web - look for me7_95040.exe Nefariousmotorsports.com should have it.

To defeat the immo, use a program called me7_95040.exe to dump the contents of the immobilizer chip to the computer. To do this, I put the ECU in boot mode, by grounding pin 24 of the immobilizer chip for 5 seconds while powering up the ECU. I then ran the program from the command prompt and dumped the file. To defeat the immobilizer 2 bits must be changed at locations 12 and 22 from 01 to 02 and the checksum recalculated. I used a hex editor to change the bit values and then used a program called 95040CSCalc.exe to write the fixed checksum. Using me7_95040.exe I uploaded the revised file to the ecu and the immobilizer was defeated.
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Old 07-16-2020, 10:53 AM   #16
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The Audi Immo is pretty trivial to bypass.
Yes, I agree that it is pretty trivial, IF you know what are you doing..

PS, the more I learn, the more I find out how much I don't know

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