E34 ZF 4HP22EH Transmission Issues

[M535 From Japan]

Wire Number 23 - Leaves the main wire harness looking like a silver home speaker wire, then about 3-4 inches down line it doesn't have any rubber wrap around the wire and just becomes bare wire but wires from #8 and #27 go into the metal twine and make their way to the round transmission plug. The #8 brown wire goes to #2 pin on the round transmission plug and the #27 white wire goes to #3 pin on the round transmission plug. The initial wire #23 just ends in stands and doesn't lead to any point in particular. I imagine that it is only there to shield the other wires???

[demetk]

That's correct. In my case I left the shield out of my harness and was going to add it if I encountered any problems on 8 & 27.

[M535 From Japan]

Ok, hold up...I have something here:
Transmission Round Plug pin #4 doesn't get any power. Out from the round plug it is a thick gauge red wire that is spliced into a thin grey wire and goes through the loom until about 4 inches from the main master plug where it just sits there in limbo...It is too short to make a connection at the main harness. Maybe it was snagged when the outer loom got caught in the output flange but it is cut very cleanly as if it were snipped with pliers.
Bingo!
Now, it seems that plug #4 and 5 have to do with solenoid #1 but where is Trans Round Plug #4 designed to lead to?

[whiskychaser]

Anybody seen the film Juggernaut?

Pins 8 and 27 are for the speed sensor. It is a simple loop. Pin 23 is just for the shield as Demetk says

27 does go to the trans socket pin 3. But from what I can see, pin 8 should go to trans socket pin 4, not pin 2

If you have got it on pin 2, you are putting a couple of hundred ohms on that circuit and the TCM isn't not going to like that

5 should be from solenoid 1 back to the TCM pin 16. IIRC, that is what your meter said too

[whiskychaser]

This is how I see the connections. TCM pin first, trans socket pin second:

23 - shield
27 - 3
8 - 4
25 - 7
20 - 2
17 - 6
22 - 1
16 - 5
1 - 8

Maybe compare with what you have and see if you agree

[demetk]

Which wiring diagram are you guys referencing?

[whiskychaser]

Which wiring diagram are you guys referencing?

Not sure about OP. But I am looking at the 6/88 to 2/89 diagrams. It includes the 3 position switch and reverse lockout solenoid switch which OP has. Above pinouts are from page 2460.0.06.

[M535 From Japan]

The way mine is setup, which is the original setup is as such:
23 - shield
27 - 3
8 - 2
25 - (goes through square black plug close to TCU at position #3) then to 6
20 - Dual pin plug both use purple wire ---> I think that is the shift lock
17 - 8
22 - 5
16 - 1
1 - 7
Round transmission plug #4 is MIA and hangs 4" from the main harness.

[demetk]

Not sure about OP. But I am looking at the 6/88 to 2/89 diagrams. It includes the 3 position switch and reverse lockout solenoid switch which OP has. Above pinouts are from page 2460.0.06.

This is probably the same as the e32 88 ETM. Your mappings agree with the ETM.

- - - Updated - - -

The way mine is setup, which is the original setup is as such:
23 - shield
27 - 3
8 - 2
25 - (goes through square black plug close to TCU at position #3) then to 6
20 - Dual pin plug both use purple wire
17 - 8
22 - 5
16 - 1
1 - 7
Round transmission plug #4 is MIA and hangs 4" from the main harness.

Very strange. What ETM did you map from? And what is Round transmission plug #4?

[M535 From Japan]

And what is Round transmission plug #4?

It is the 8-pin Round plug that connects to the side of tranny.

[whiskychaser]

It is the 8-pin Round plug that connects to the side of tranny.

Yes, Demetk. Just checked. The diagram I am using is the same as the 88 E32

OP, are you quoting the pin numbers as viewed from the back of the trans plug or the front? Maybe check page 29 of the Tech Guide for the layout. That page also includes the resistances you may need when checking

[demetk]

So pin #4 has pulled away from the round plug and just hanging? Can you post the wire colors associated with your mappings? Is #4 a brown wire?

- - - Updated - - -

If it's a brown wire then it's a ground for the speed sensor signal.

- - - Updated - - -

But then again it looks like at the actual speed sensor signal,

[M535 From Japan]

This one, Number 4
https://screenshot.net/8nnmmb9
It is thin grey wire from the Round Trans Case connector and goes towards the main TCU plug but stops about 4 inches from the main plug.

[M535 From Japan]

Yeah, it feels like Juggernaut...See the thing that makes this weird is that when I bought the car, before the engine and transmission swap, the transmission worked beautifully. Nobody played around with the wire terminals, so they should be the same way they were before. Now with the new wire loom and the original transmission and TCU, I assumed that I should mimic the old wire loom positions and everything should lead to where it needs to go. Does that make sense?

[M535 From Japan]

Ok guys, I was using numbers for the round Transmission Case Plug as if they were standard and they're not and it was confusing for everyone...My bad, sorry.
We'll forget the idea of giving the round plug numbers and just stick to colors. I just pulled this chart from Bentley E34 and this chart most resembles my setup: https://screenshot.net/wqg98fq
With four exceptions that I have found up until now:
- Mine has an 8 wire round Transmission Case Plug and this one in the chart only uses 7.
- My number 4 from the main plug leads to the blue 6-wire connector that plugs into the E-S-M mode selector switch (top left pin position when the triangle points upwards) and also to the 12-wire black plug next to the gear shift lever (position #9 on that plug) --- The #4 in this chart is unused.
- Position 32 on mine is unused
- Position 33 on mine is unused
So let's go color by color:
1- Orange from 16 into Round TC Plug --> OK
2- Violet from 1 into Round TC Plug --> Ok
3- Red from 22 into Round TC Plug --> OK
4- Green from 17 into Round TC Plug --> OK
5- Blue from 25 into Round TC Plug --> OK
6- Brown from 8 into Round TC Plug --> OK
7- White from 27 into Round TC Plug --> OK
Which leaves Grey #8 from the Round TC Plug but connects to nothing...Then I found this chart on the next page of Bentley... And this one has an 8-wire Round TC with a Grey wire that goes to the Hydraulic Pressure Regulator - But it uses a 55-pin main plug to the TCU and mine only has 35-pins...
https://screenshot.net/3x5qwtkPlug

The one question left to answer is where does that grey wire go on my setup?

[whiskychaser]

The diagram in the Tech Guide is for the trans socket, not the trans plug. It looks like you have just got some of the pin numbers upside down. You need to number the pins looking from the back of the plug (where the wires enter) and account for the orientation using the lugs.

That aside, Bentleys also includes the pin numbers at the trans end. They tally with what I said at post 30 and the diagram I was talking about. Demetk kindly posted it above and the colours tally too. The grey wire goes from pin 2 at the trans end to pin 20 of the TCM. (I realise you are calling it pin 8) It controls the lockout solenoid. As I said, the later trans doesn't have that solenoid so that wire has probably been deleted from your replacement loom. But yours does.

The absence of that wire could account for the trans prog code as the TCM isn't seeing a return voltage at pin 20

[M535 From Japan]

Whiskey, please know that it isn't that I don't want to follow advice, it's that I am really new to this and just didn't understand what you meant with some posts. Also, PLEASE know that I appreciate yours, Demetk and Shogun's help - You can't understand how much I appreciate all of your help!!! You guys are great to take the time to help me with this.
At TCM pin# 20 there is a Brown/Violet wire, which is from the Shift Lock Solenoid (it works in conjunction with TCM#1 wire), if I use pin #20 for the Grey wire coming from Trans Socket #2, what do I do with the Brown/Violet from the Shift Lock Solenoid?
I'd rather ask instead of screwing something up...

[M535 From Japan]

Ok, so:
On the positive side of things, all the stuff that has been done so far has shown that the mode selector switch is working just fine. I can switch from E to S
to M without problem. It wasn't the case before.

Not sure if this matters but the shift lock never actually locks. But it does work, I tested it.

Now, for remaining issue:
- I unplugged the 2 wire plug that goes from TCM #1 (Violet) and TCM #20 (Violet Brown) to the Shift Lock -- That way I could plug in that Grey wire that comes from the transmission socket into the Violet Brown wire which leads back to TCM #20, essentially deleting the Shift Lock and getting Grey Wire into #20 position. It didn't change anything.
- And I also just spliced the Grey Wire and sent its current into TCM #20 while the Shift Lock was plugged in: Didn't work either.

When I put the key to accessory position, I have power from TCM Pins #3 (empty slot), 12, 18, 28, 34, 35. Could one of these serve as power to the shift lock??
My guess is that I'm looking for a power source that will know when the mode selector is placed in Manual mode and allow gears to be changed.
Do you have any suggestions please?

[whiskychaser]

Always pleased to help. It is certainly better not to change anything without checking and being convinced that doing that is absolutely right. If pin 20 is used for the shift lock now you cannot just connect the stray grey wire to that.

It would be very unusual to have an 8 pin plug if the reverse lockout solenoid is not present. When they make changes like that, they change the design so you cant even plug it in. But it might be worth checking what you get on your meter if you connect it to pins 2 and 8. And if you still have your original loom, how that is wired. There will be a way round it. We just have not found it yet

Edit: With a few exceptions, BMW circuits are live and grounding them completes the circuit. The TCM controls whether that happens or not. There is probably no voltage coming from the grey wire so it would not a difference. But I would avoid taking chances

[demetk]

At this point you're not sure if the TCM is OK or not. I would imagine trying to find one of those rare 190 TCM's on the market may prove difficult. There are plenty of 007 TCM's around for a couple of bucks and they were designed for the 8 pin EH trannies. Millions of cars came with the EH tranny and without the shift lock so it's not that important. I would get the tranny working again and maybe add the shift lock functionality later.

[M535 From Japan]

I would get the tranny working again and maybe add the shift lock functionality later.

How? I tried plugging the Grey Wire directly into TCM pin #20 - It didn't work. Honestly, I couldn't care less about the shift lock...
Would it make sense that the spot where that Grey Wire goes might be an empty spot???
Unused:
TCM #3 sends power
TCM #31 no power
TCM #32 no power

[M535 From Japan]

Always pleased to help --> You Rock!
But it might be worth checking what you get on your meter if you connect it to pins 2 and 8.

TCM pin#2 goes to the kickdown throttle
and #8 is the brown wire on the Round Transmission Socket.

[whiskychaser]

TCM pin#2 goes to the kickdown throttle
and #8 is the brown wire on the Round Transmission Socket.

My apologies. I meant using your meter on ohms on pins 2 and 8 on the TCM socket - to confirm that there is actually a reverse lockout solenoid in there.

[M535 From Japan]

This is how I see the connections. TCM pin first, trans socket pin second:
20 - 2
1 - 8

So, I ohmed TCM Pins #1 and #20 together and I get 17.8

[M535 From Japan]

I just found something that might be wrongly setup:
On my original setup:
TCM Wire #10 (Brown) and #26 (Blue/Red) worked towards a dual wire plug that (I believe) goes to Brake Light Switch
So in mimicking the old setup, I arranged things the same way on the new loom.
But on the new loom wire #10 is grey and used to lead to the 6-pin blue plug that connects to the selector mode switch. I had to modify that also, if I were to mimic the old setup and expect it to work.
Upon looking at the different charts, they only have Blue/Red wire to the Brake Light Switch -- just one wire. So, could Grey #10 serve another purpose?