4.2 v8 swap no wiring help

[lazerreda4]

Swapping a 4.2 into 02 4motion passat having trouble figuring out how the ecu relay is wired i have both wiring diagrams but have trouble figuring out the wiring diagrams. Any help is appeciated.
The passat is my brothers i swapped my A4

[bhusted]

Which engine code did you use? The ART doesn't require an ECU relay. The AWN uses an immobilizer that will have to be coded out of the ECU. Additionally, you'll need to apply power to pin 21 on the ECU to allow the ECU to turn on.

[lazerreda4]

Ok forgot to mention that we don't have power to fuse 28,29,32 nether we got the a4 to start going to send the ecu's out when get the passat to fire.

[lazerreda4]

the engine code is awn. also the clutch switch on the manual swap. I did the write up as per breakout motorsports. but after reading walkys thread. not sure exactly how to do it. seems like 2 different ways?

[bhusted]

I don't know what walky said, but the part that written on breakout is correct. I did end up using the wrong switch at the beginning and had to swap it out.

[lazerreda4]

ok. I think I am misunderstanding the wire routing or maybe I am missing something. I don't see them routing the wiring down to the clutch switch. seems like they [breakout] went from pin to pin and not down to the switch at the pedal. by the way thanks for all your help man. your setup looks great!!

[bhusted]

In the Breakout car, the car was already DBW, so they simply added a wire from the engine side of the white plug to pin 39 on the ECU. If your car is DBC, you'll have to add the wiring to the clutch switch itself and integrate it into the white plug on both sides.

[lazerreda4]

ah I see now. my car is a dbw 01 model but it was a automatic. I swapped it out to manual when I did the 4.2. so I will have to add that down at the pedal too. I have the switch already there. your help is beyond great. thanks again man!! hearing he Passat fire today was a great thing. haha

[lazerreda4]

was going back over my wiring and finishing up some things. noticed the plug that goes over to the master cylinder is not in the v8 harness. is that needed for the v8? i traced it back and i can add it but was just wandering what you guys did with it?

[wolfe2118]

was going back over my wiring and finishing up some things. noticed the plug that goes over to the master cylinder is not in the v8 harness. is that needed for the v8? i traced it back and i can add it but was just wandering what you guys did with it?

Can you possibly take a picture? The only plug that goes into the master cylinder is the brake fluid level and it enters the car interior of the car behind the ecu box, it's not even on the engine harness.

Like bhusted said, an engine code would be helpful.

[lazerreda4]

I can add a pic of it tomorow. it is in the harness on the awm 1.8t harness. the engine code on the 4.2 is awn. from 02 a6. my brothers 02 4motion Passat has the same plug to.

[bhusted]

I assume you're referring to the switch on the brake pedal adjacent to the clutch switch? You need that as well. There will be a 4 pin switch for the brake pedal. IIRC, the 2 large pins are the NC switch for the brake lights and the 2 smaller pins are the NO switch for the ECU.

[Mad Cow]

There was a vacuum pump for the brake booster on automatic '00 and later 1.8t motors, with it was a sensor on the brake booster vacuum line. I remember seeing it referenced on AWM engine harness wiring diagrams, so that might be what you're talking about.

[lazerreda4]

mad cow I think that's exactly what I am talking about. I have all ready removed the vacuum pump. so I will leave it as it is.

[lazerreda4]

well have a set back. go it fired up and running but some how the radiator developed a leak while sitting. bhusted sent a pm

[lazerreda4]

have another question for the audi gurus. i noticed after letting it run for a bit i have a epc light on. tried doing a tba and didnt change anything. abs light is on that checked to be my rear wheel speed sensor. vcds codes were
18057 missing message from abs controller
18041 accelerator pedal position sensor signal to low.
also had rear 02 sensor and sair codes. deleted those items but havent had them coded out yet.
any ideas on the epc light?

[lazerreda4]

took it around the block today and its in limp mode. noticed when I first start it it has no throttle pedal. but as I give it throttle it will pick up and rev up as soon as the epc light comes on. not sure what is going on wit it.

[bhusted]

I thought you had a leaky radiator? Driving around without?

The only codes you got were the 2 listed above? It sounds to me that there is an issue with either the throttle pedal or throttle body. Since you have another engine nearby, you may want to try swapping throttle bodies or throttle pedals to check.

[lazerreda4]

it was leaky I fixed up enough to not leak and let it run for good while today.
Man I felt good to be back in my b5 again. and that's what I was thinking. seems like it might be the pedal. the throttle body adapted and said ok. I will dig into it more tomorrow. Hoping its not a wiring issue. The epc light goes out after restart and only comes on when pedal is pushed

[bhusted]

It is a good feeling. I'd start with the pedal.

[lazerreda4]

yes it is! that will be the 1st thing i do in at the shop in the morning. thanks man

[Mad Cow]

For the ABS controller code you might be able to code the ECU to disable ASR/ESP, which will disable communication to the ABS unit. It's not really important though since it won't light the CEL. As the the throttle pedal code, my guess would be one of the potentiometers in the pedal is acting up in a certain range. You might have to find another pedal.

[lazerreda4]

got it all sorted it out. it was a wiring issue that was my fault. thanks guys. I have a vcds is it possible to code the ecu with that to get rid of that code. my car doesn't have asr/esp any way. V8 is awesome!! now to get x-pipe done and shake it down..

[bhusted]

You may or may not be able to change the ECU coding. I wasn't able to change anything until I had it flashed. Have you recoded the cluster for the V8 tach signal?

00XXX - The first two digits apply to the country.
*16 is the only available option for those in the USA

XX0XX - The third digit codes the ECU for what drive and options you have
*0 states FWD with ABS
*2 states Quattro with ABS
*5 states FWD with Anti-Slip Regulation/Electronic Stability Program (ASR/ESP)
*7 states Quattro with ESP

XXX0X - The fourth digit states which transmission you are equipped with
*0 is for 5 speed manual transmission
*5 is for 01V automatic transmission

XXXX0 - The last digit will state which vehicle the ECU is installed in.
*1 states installed in Audi A4

EX: A manual, Quattro A4 in the US should be 16201 or 06201

[lazerreda4]

I will give that a shot. I am running the A6 cluster didn't do anything to it at all. should be getting the tune soon. the rev hang is going to drive me nuts. haha
what tune are you running? did the tune wake it up?

[bhusted]

I'm running ddillenger's euro S6 file. It's really great. It got rid of the rev hang, high idle and made it rev more freely. Lost the 3rd stage of the intake manifold, but I'm working on fixing that.

[lazerreda4]

Good to hear feed back on that tune that what I plan on running. By loosing the 3rd stage does it affect the bottom or the top of the rev range. or torque? Also would your possible fix be available? are you using the 1.8t transmission?

[bhusted]

It takes out the very top end of the torque range. The change over is supposed to happen at 5200 rpm. I tried running it with the 3100 trigger opening both of the flaps, but it felt sluggish in the middle. Right now I have the upper stage fully shut and just running the middle. I'm looking at using a small rpm switch to trigger the upper stage. I'm using the V6 transmission.

[lazerreda4]

Oh I see. makes sense to me now. that's what I swapped out to the 2.8 5spd driveline. do you like the combo V8 and 2.8 trans? Sorry for all the questions man.

[bhusted]

No problem. The gears are well spaced for driving around town. I really wish it had a 6th gear that was much taller for highway cruising. It's running close to 3k rpm at 70mph. I've read that the 2-3 syncro is the weak point of the 01A. If it ever starts to give me trouble I plan to upgrade to the 01E with a taller 6th. It's much more robust, but also much more expensive.