96 Abs Module In A 94 Turbo

[Cal3thousand]

I want to run a 98 cluster. What would it take to run a 96 ABS Module in my 1994 turbo

Do i need a new Master Cyl? Or would it be just module and sensors? Or am I dreaming?

[FCP Euro]

I never thought to do this but I would think you would have to swap out the master cylinder and everything.

[Cal3thousand]

I never thought to do this but I would think you would have to swap out the master cylinder and everything.

Would VADIS be of any use here?

[Gage]

Would VADIS be of any use here?

i would think so but the main issue would be how to plug it all in as the 96 and 94 have totaly dif plugs

[Ozark Lee]

I'm not so sure that you need to change it at all. I know on a lot of manual swaps that a wheel sensor has been tapped to replace the VSS which leads me to believe that the original VSS on the 94 would behave the same as the integrated wheel speed sensor signal on the later versions.

...Lee

[Cal3thousand]

I'm not so sure that you need to change it at all. I know on a lot of manual swaps that a wheel sensor has been tapped to replace the VSS which leads me to believe that the original VSS on the 94 would behave the same as the integrated wheel speed sensor signal on the later versions.

...Lee

Well... I've brought the topic up before. And during the last thread, someone stated that the signal going to the cluster was a digital signal and my car outputs an analog signal. But I'm not sure either way. I'm going to search for that thread and I'll edit this with the link if I find it soon.

EDIT: found the old thread: VS - Cluster Talk Thread

[Cal3thousand]

This was posted by AnthonyR and pretty much explains the whole shebang:

"Posted 07 April 2006 - 06:02 PM

no, the 95ABS computer does not send out a digital speed pulse like the 96+. Which doesn't matter anyways, because the 95- clusters use an analog speed signal. Whats the difference you ask? Digital speed pulse pulses +12VDC a certain number of times for each wheel revolution (in the Volvo's case, 48 +12VDC pulses for every wheel turn) digital also works on one wire. where as an analog speed signal operates over 2 wires (+and-) and operates on a rising AC voltage (as the car increases speed, the AC voltage across those 2 wires increases)

Now you're not tapping off the abs computer, you are picking an individual wheel ABS sensor and tapping off of the 2 wires that run from the sensor to the abs computer as the ABS sensor works with an analog speed signal. In my case I tapped off the Front Right ABS sensor and it had a black and red wire, black was - and red was +. I just spliced those 2 wires and ran them to the back of the instrument cluster to pins 2 and 3 (I will dig up the schematic)

This also allowed me to have the 850 cluster read speed and output the digital pulse (pin 6) and run it to an S70 cluster in my dash, but that is entirely optional. "

Looks like I would have to upgrade to a 96 ABS unit or cannibalize my old cluster and "hide" it somewhere between the 94 ABS unit and the 98 cluster.

Gage also pointed out that the "plugs" are different. I think he means the harness at the ABS connection?

[Ozark Lee]

I need to boot up a Windows partition to fire up VADIS to look at the waveform charts - Vadis won't run under Linux even with the Windows Wine emulator. The wheel sensors are a definitely a digital signal from the hall effect sensors that read the reluctance rings on the axles. I'm not real sure what the output of the VSS is on the early models - analog or digital. The VSS signal to the speedometer on the early models never runs through the ABS module. The ABS module is its own "system" that doesn't really interact with the rest of the car.

On the '96 and on it all got combined through the ABS module which was a horribly bad decision but they saved the cost of a sensor on the transaxle. I guess they never figured that each and every '96 and on ABS module would fail.

Even if the transaxle output is analog I think you can tap a wheel sensor and get the speedometer to work. My gut tells me it will polarity sensitive so as to not screw up the ABS system.

...Lee

[Cal3thousand]

I need to boot up a Windows partition to fire up VADIS to look at the waveform charts - Vadis won't run under Linux even with the Windows Wine emulator. The wheel sensors are a definitely a digital signal from the hall effect sensors that read the reluctance rings on the axles. I'm not real sure what the output of the VSS is on the early models - analog or digital. The VSS signal to the speedometer on the early models never runs through the ABS module. The ABS module is its own "system" that doesn't really interact with the rest of the car.

On the '96 and on it all got combined through the ABS module which was a horribly bad decision but they saved the cost of a sensor on the transaxle. I guess they never figured that each and every '96 and on ABS module would fail.

Even if the transaxle output is analog I think you can tap a wheel sensor and get the speedometer to work. My gut tells me it will polarity sensitive so as to not screw up the ABS system.

...Lee

Where in VADIS would I find the waveform charts?

So, are you saying that all ABS sensors put out the same type of digital signal? And that the pre 96 speedo takes its speed in analog form from the Tranny? AND if so, I can just take the signal by tapping one of the 2 ABS sensor wires from any sensor?

I'm just wondering why nobody has done this. And why AnthonyR went through his old cluster instead of going right to the new cluster from the sensor. I'm going to PM him and see if he can chime in.

I'm sure there are plenty others that are ultimately interested in the outcome.

Ozark Lee, Thanks for your input. It is always taken with high regard :)

[Ozark Lee]

I finally found the answer in VADIS. The signal from the VSS on the transmission is in fact digital, 48 pulses/revolution. Conveniently the ABS is also 48 pulses/revolution so it should be plug and play.

...Lee

[Cal3thousand]

I finally found the answer in VADIS. The signal from the VSS on the transmission is in fact digital, 48 pulses/revolution. Conveniently the ABS is also 48 pulses/revolution so it should be plug and play.

...Lee

So since the 98 cluster takes the digital signal on the +12VDC, I just need to tap the (+) positive line going from the tranny VSS and hook it to the cluster?

Sounds so simple... Hopefully I can test this out this weekend. I'll report back if that's the case.

[Ozark Lee]

I pulled the diagrams for both clusters and it should just plug in and work. No need to tap battery voltage at all. The speedometer - signal is just ground. The Speedometer + signal is the pulsed signal from the sensor. If it doesn't just work try grounding the Green / Yellow wire on pin 2 of the connector to the chassis or to the Brown wire on pin 15.

...Lee

[Cal3thousand]

I pulled the diagrams for both clusters and it should just plug in and work. No need to tap battery voltage at all. The speedometer - signal is just ground. The Speedometer + signal is the pulsed signal from the sensor. If it doesn't just work try grounding the Green / Yellow wire on pin 2 of the connector to the chassis or to the Brown wire on pin 15.

...Lee

OK... will do... are there any possibilities for ill effects if it doesn't go as planned? Of course I hope for the best, but I want to be prepared for the worst :lol:

[lotsofmagnets]

feel a bit rude making this my 1st post but i´ve been lurking for ages. i promise to get around to an introduction soon enough has anything come of this yet? i´m receiving a 98 v70r cluster in the coming days and am hoping to put it in my 93 next week. i found anthonyr´s original writeup where he used the original cluster to convert the signal although i´ve never found the schematic bu was wondering if a neater solution has been found yet. i guess i could use the hack as here in iceland the earlier 850s didn´t have airbags so i have a place to stash the old cluster! cheers :)

[Cal3thousand]

feel a bit rude making this my 1st post but i´ve been lurking for ages. i promise to get around to an introduction soon enough has anything come of this yet? i´m receiving a 98 v70r cluster in the coming days and am hoping to put it in my 93 next week. i found anthonyr´s original writeup where he used the original cluster to convert the signal although i´ve never found the schematic bu was wondering if a neater solution has been found yet. i guess i could use the hack as here in iceland the earlier 850s didn´t have airbags so i have a place to stash the old cluster! cheers

I haven't had time to check. More pressing issues including a oil return line that was missing a fastener . Yeah, under a oil soaked car at midnight is no fun.