Bought replacement trans for 850 but it's DIFFERENT??HELP!!

phoenix_iii · Post by **phoenix_iii** » 19 Nov 2007, 19:28

Trans is back in. Going to try a direct wire. If no joy, ,going to read off of the front wheel abs sensor... =)

phoenix_iii · Post by **phoenix_iii** » 26 Dec 2007, 08:29

Good News!

Trans is IN. VSS is NOT hooked up. Mechanic says the car drivers perfectly. Shifts correctly, pulls well, etc.

VSS not hooked up = no Speedo, and check engine light

He is going to try hooking up the VSS to the 'new' spot by splicing the wires. If that doesn't work, I will take it upon myself to do the ABS wheel sensor trick.

Post by **sseir39** » 26 Dec 2007, 18:21

Happy to hear things are progressing. Be sure to keep us informed as you are breaking important ground for a bunch of us.

phoenix_iii · Post by **phoenix_iii** » 27 Dec 2007, 06:01

sseir39 wrote:Happy to hear things are progressing. Be sure to keep us informed as you are breaking important ground for a bunch of us.

Once I/we get the VSS from the ABS or the actual VSS and speedo works and code is cleared, I will post actual trans #s (I have them written down somewhere) so we know what works...

=) Goodmorning... sleepy. Just wanted to reply. I know this thread will be useful to some one some day.

phoenix_iii · Post by **phoenix_iii** » 28 Jan 2008, 17:41

Everything works perfectly now. I did the wiring trick and everything works! Driving 100 mile trip now to test it for sure... will post all details soon!!!!

Post by **sseir39** » 28 Jan 2008, 18:40

Great! Hope this solution gets into the repair or replacement section.

Dick

Post by **MadeInJapan** » 28 Jan 2008, 19:05

sseir39 wrote:Great! Hope this solution gets into the repair or replacement section.

Good suggestion, Dick....it's done!

phoenix_iii · Post by **phoenix_iii** » 29 Jan 2008, 07:15

The Project:
Take a 96+ Volvo 850 Turbo trans and put it in my 95 850 Turbo

The Problem:
The VSS (Vehicle Speed Sensor) wiring is different/reads from a different spot on the 'newer' trans. The original spot on the newer trans is filled in, and the heads on the connectors are different. Despite being both two posts/wires, my mechanic said he hooked up the wiring directly to the new trans, and it did not work. Taking his word on this, I moved onto the following.

The Solution:

Take the two wires (yellow and black, green and yellow) coming from the transmission wiring harness (and would 'normally' plug into your 'older' trans), and cut the connector off.

Go over to your drivers side wheel. Remove the wheel. Properly unplug the abs sensor (while squeezing the obvious tab, wiggle it side to side to help break the 'crud' seal, then pull up and out). Cut the end off the ABS wheel sensor, but *leave enough room to splace more wire onto it!*... like an inch and half if you can.

Solder, and heatshrink tube, about 2 inches of wire to the ABS wheel sensor head (hence you left the extra working room). Make sure to splice and expose both ends of the new wire first, no need to solder/heatshrink and THEN try to remove the shielding on the other end. All we are doing here is giving you more room to work, or if you bugger up the end, you can try again

Solder and heatshrink tube a good foot (or two, I really only needed like 18 inches and that was almost too much) wire to the two transmission wiring harness wires.

Solder and heatshrink tube a good few inches to go onto the other end of the ABS wiring that you cut.

Well great, now you've got six wires hanging around, when you started off with 2. wth? =) Easy. If you are nutty like me, you want to check your work at this point. Simply plug in the ABS head again, and twist the new wires together (the black wire from abs goes back to black wire from abs wiring harness and brown(or dirty, dirty red?) wire goes back to brown (or dirty, dirty red). Turn car on, start car if crazy (I had mine secured on jack stands, both wheels in the air). No ABS codes. If your ABS and TRACS light is on, then you may have swapped wires. Oops. Swap them, and try test again. Idiot lights go out when hooked up correctly, may have to clear engine codes later.

Alright, now it's time for the big test. Twist in your wires, bumble-bee (yellow/black from the trans harness) to the brown wire from ABS wiring, and the green/yellow from trans harness to the black. Now originally, I had my wiring at this part backwards, and it didn't work, and I think it threw up ABS/TRAC light too (wth?). Anyway, if adding this wiring makes things worse (doesn't work or you get idiot lights), just REVERSE the wiring, meaning put yellow/black to BLACK on the abs harness and yellow/green to BROWN on the abs harness. I've done it, nothing caught fire. =)

When I first had this working, I thought it was FUBAR, because at idle (make sure to put the car in DRIVE. I had it in park and thought it didn't work! speedo won't go no matter how high you rev in PARK!!). Anyway, in drive, at 'idle' with foot off the brake, it shot up to 15mph, then 25! Then back down to 15. This is NORMAL and you are ready to close shop! Remember, with the front of the car on the ground, you get a few mph. Take 3000lbs off of the car, and 'idle'/coast = 15mph+ I had one wheel off too.

Anyway, that's it. Once you are happy, you need to solder and heatshrink the cluster together, and then zip tie excess wiring so it doesn't rub away the shielding and give you guff later. You want this to be water tight now, so take your time. =)

I used thick cable (10gauge, when the oem wiring is 18gauge/16gauge), because that's what I had. Pics up when I get them off my phone. I can verify wire colors when I get under there to finish it up myself (needed more heatshrink!) But it's great. Car actually would downshift aggressively in sport mode... the flashing up arrow... gone, the flashing econ/sport mode button, solid! =)

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Post by **MadeInJapan** » 29 Jan 2008, 14:19

Nice job! This will be a great addition to the repair database. If anyone needs this info, it's now here on MVS!

phoenix_iii · Post by **phoenix_iii** » 11 Feb 2008, 19:35

Original 95 850 Turbo Trans

'Made in Japan'
Serial...

50-42

1280
560

--------

Replacement from 96+ 850 Turbo

Made in Japan

50-42LE

1208
840