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TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

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Old June 23rd, 2013, 17:58   #16
archemitis
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Quote:
Originally Posted by vdubspeed View Post
AH! That makes sense because my donor was an auto


Did you add a clutch switch wire? Isnt it necessary for cruise? My donor also came from an auto, and this is the first pin I think I need, that I dont have T121/66.
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Old June 23rd, 2013, 20:32   #17
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No I didn't add a switch for the clutch. My thinking is that the ECU won't care because it thinks it's an auto and won't look for and therefore the ECU will not care.

I am buying another TDI mk4 to part out this week that is actually a 5spd so I'm curious to compare harnesses.

I really don't know EXACTLY what pin 88 is for just yet as I haven't gotten that far. I have read other threads though that have said it's ignition (circuit 15).

All we need is one person who has an ALH swap to confirm how their ECU is powered. I understand how everything else is powered(grnd signal from ECU engages 109 relay)

Thanks,

Jason
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Old June 23rd, 2013, 21:42   #18
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Clarification (not intended to highjack the Thread, but I have received a few PMs)

14a/10 does go to the Load Reduction Relay. However, it also goes on to D75 in the ignition switch. On the way, it goes through Fuse 37 and Splice A80. Splice A80 is where it branches off to the Load Reduction Relay.

In summary, current goes from D75 in the ignition switch, to Splice A80. There it branches into two circuits. One goes directly to the Load Reduction Relay and the other goes to Fuse 37, then to connector 14a/10 and on to pin 121/88 of the ECU. That circuit is only hot when the Ignition is ON. In the start mode, that circuit is dead at both the Load Reduction Relay and Pin 121/88 at the ECU.

I suppose the function of Pin 121/88 can be determined by removing Fuse 37 and see what happens. Apparently there is a need for it to be fused.

I did include the circuit from D75 to Pin 121/88 of the ECU in my applicaton with the use of Fuse 37. From the Donor vehicle, there is no need to use the Load Reduction Relay if you use the receipient vehicle ignition system which already contains that relay.

EDIT: The Clutch switch is not necessary. However, the circuit needs to be completed for the Cruise to work. Right now, I have mine wired directly by-passing the switch because it needs adjusted to be instant. When the clutch pedal is depressed, if the switch doesn't instantly disable the Cruise, RPMs will go up extremely fast .........
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Last edited by AndyBees; June 24th, 2013 at 08:46. Reason: Add comments about cruise
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Old June 23rd, 2013, 22:06   #19
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Does the ecu care if the starter is cranking?
No it doesn't.

I have no idea what pin 88 is for - the 80 pin ecu's don't have that wire. All you need to power the 80 pin ecu is the provide 12v to sw/li and ro/li and of course provide ground. Maybe pin 88 is just another wire you need to provide 12v?
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Old June 24th, 2013, 04:04   #20
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Today after work I will pull fuse 37 from my brothers stock 2000 Golf TDI.

If it doesn't start...pin 88 requires 12V.\
If it starts...hmmmm...
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Old June 24th, 2013, 04:39   #21
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I scratched my head over T14a/10 for a long time trying to come up with an elegant way to wire it into my VR6 swap. Eventually I gave up and never wired it. Everything works just fine. Not necessary in my case.
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Old June 24th, 2013, 08:27   #22
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Sorry if i got this going in a hijacked thread sorta direction, but this is good stuff!
Im going with T121/88 and t121/37 wired to "on" position on my ignition switch. They are the only two wires going directly to the ignition from the ecu.
Hoping to finish up an hour or so of soldering tonight then power it up. I have "Torque" on my phone, to look at sensors and stuff before I try to start it.

AndyBees, that cruise situation sounds terrible, especially at highway RPMs! thanks for the warning, sounds like a spring pull brake switch wont do the trick.
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Old June 24th, 2013, 09:25   #23
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archemitis - report back with your findings!
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Old June 26th, 2013, 15:31   #24
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I have a 2003 harness with a 4-wire glow plug system in it and a 2001 ECU. The only real difference that I can tell is that one of the wires for this is in a different spot. Do I need to do anything about it, can I move the wire over and will it be fine or do I need to get a 2003 ECU?

archemitis - 37 is what wakes the ecu up from the key.
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Old June 29th, 2013, 11:58   #25
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Yes! I just confirmed this on my own harness. 37 makes the 109 click on, clicks inside the computer, and also something on the pump hums, or hissses for a bit. Got my phone to recognize my ecu! Not sure about 121/88 yet.
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Old June 29th, 2013, 13:00   #26
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I went back and checked my notes and 88 is just another you need to apply 12V with key on (jimbote posted it a while a go in a swap thread).
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Old June 30th, 2013, 18:36   #27
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Awesome. So 37 tells the ECU to come alive. I've been busy parting out another TDI (00 Jetta TDI/5 spd) that my bro needs for a parts car. I'm fortunate to be keeping most of the swap stuff though since he just needs body parts and few other items.

What plug does 121/37 go to?
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Old June 30th, 2013, 20:43   #28
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Quote:
Originally Posted by vdubspeed View Post
Awesome. So 37 tells the ECU to come alive. I've been busy parting out another TDI (00 Jetta TDI/5 spd) that my bro needs for a parts car. I'm fortunate to be keeping most of the swap stuff though since he just needs body parts and few other items.

What plug does 121/37 go to?
Well, according to the Bentley for my '02 Jetta donor car, 121/37 goes thru T6/1 (the brown connector) then to an internal "splice" in the wiring harness (the splice is identified as A104). One branch goes to 14a/8 and stops there (thus no use). The other branch goes to Fuse 29 and from there directly to the ignition switch at D15 (Hot when in the ON position). Technically, you could say the current flows to 121/37, thus, making the ECU come alive when the Ignition is turned ON!

Hope that answered your question.
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Old June 30th, 2013, 21:07   #29
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Once vdubspeed finalizes the chart (after all the questions are answered) and we've covered manual trans as well, I'd suggest to make a sticky. The ALH is so popular in swaps that this this is going to help so many people.
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Old June 30th, 2013, 21:31   #30
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I've been updating all the files/notes on my ALH build/conversion project..... more or less what you would call "as built" drawings and notes. It has been my intent to do something similar to what vdubspeed has done! Considering he has beat me to the punch, I'll not bother!

Markd89, this Thread will make an excellent sticky as you have suggested!
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