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

I bought a replacement transmission for my 850T from ebay, it arrived, mechanic had it resealed, went to put it in, and says its DIFFERENT

Both are AW/50-42 (same trans in all US model 850s), but one has the (I think) engine speed sensor (or rpm?) more towards the flywheel and the other is further back on the trans. Also, they are both two post connectors, but different plugs, so would not just swap into the car.

Easy solution is to cut and adapt, but if reading from different areas/different things, could be a big problem?

What gives?? I thought all AW/50-42s were the same? This one is from a 96!! What can I do?? Please tell me it's fine, it's the same (hall?) sensor/thiny and to just have him cut the wire and adapt it. I will have pics up tomorrow if it would help.

Please advise! =(

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

phoenix_iii,

I can't help you on this one. Let's wait for Tech. BTW, what year is your car?

Regards
Axel

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

Original Car = 95 850 Turbo
Donor = 96 ebay trans.

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

I would like to see the pics.
Some cars have a red sensor by where the passenger side axle goes and some don't.
The rest of the sensors should be the same.

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

It might be that the '95, although it has an OBD II port like the '94, is truly a OBD I car. Thus, the OBD II related connector is different. - AB

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

Here we go. See pics! =D Need help, mechanic is waiting for how to proceed.

http://pho3nixserver.no-ip.org/forum...anscallout.jpg

Replacement

http://pho3nixserver.no-ip.org/forum...anscallout.jpg

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

"VEHICLE SPEED SENSOR
Vehicle speed sensor, mounted in transaxle housing, is an
input device consisting of speed sensor rotor and speed sensor. Input
signal is delivered from speed sensor to TCM with each revolution of
axle shaft. TCM uses speed sensor input signal for controlling
transaxle operation."

Seems that both read the axle speed. GREAT. So which is which when we do the wiring? =)

Difference is '95' and '96' according to the manual.

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

Does the empty plug go all the way through so you can install the sensor in the new one?
Does the old one have the sensor on the top like the new one?
I haven't run into this yet and have done a few tranny swaps like this one before.

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

The 96 is plugged in that the outer cover incorporates that dimple, but it's plugged by that outer cover. Could I swap outer covers? Is it just a hall sensor? Not sure how the whole thing works, hence having it done at the mechanics.

Tech - Can you provide me the PART #. If it's the same for both, I can tell the mechanic to wire something up, or whatever other advice you may have. I will call him tomorrow to discuss. I am hopeful they are the same. =D

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

Exactly which part #'s do you want for both sensors?

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

According to Vadis one is a Tachometer sensor the pigtail sensor on top.(3515266)
The other one by the Axle is a veh. speed sensor (9148788)
Thats for a 1995
Info for 1996
9168039 says only output signal for the 1996 it shows a pick of both sensors like the 1995 but can't get any part #'s which means the parts don't exist.
I can try doing some more checking tomorrow at work.

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

Hmm. The Volvo pdf I have for the trans says both are vehicle speed sensors. If you could find out anything that would be GREAT, I would even pay you if necessary! There is a big data plug that they both share further up on the trans (multipin). I just hope the pdf for the trans is right and they are both vehicle speed, both from the axle, and I can hook it up accordingly.

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

http://img77.imageshack.us/img77/7210/vss1gp9.jpg

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

I was checking today but didn't come up with anything.

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

Thank you for looking. Just about ready to tell the mechanic to hook it up and see what happens. =(

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

You never know.

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

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.

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

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!!!!

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

Glad you got it figured out and all is good so far.

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

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:

[ul][*] 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. [/ul]

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! =)
p3