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General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
The hydraulic parts are identical, so yes, the pump, valve block are interchangeable. The ECUs are electrically different, so you can only use a 2wd ECU on a 2wd loom, and a 4x4 ECU on a 4x4 loom. The 4x4 ECU's also programmed differently, so not suited to a 2wd application.
The wheel sensors I think are different at the front, not 100% on that though.
Most common faults are wheel sensors and the fluid level sensor in the cap.
Thanks for the thread link mark So what did you do in the end? Are we saying 100% that the pump, servo valve etc etc is the same from a 2wd and 4x4 saph? This is doing my head in lol
People convert to 2wd from 4x4 all the time, what do they do? Leave the 4x4 abs system in?
Last edited by DixieTheKid; 16-08-2012 at 02:16 PM.
that "gadget" is there to join the pipes rather than using one long pipe
you can use the mechanical bits from either car but you must use the electrical bits from the 2wd or the 4wd cars for each application
the sensors only differ in the amount of shielding they run to stop the signals getting interfered with from other sources and, from memory they were something silly like 104 108 and 112, but what the numbers mean i have no idea
the bigger numbers were from the granadas as they ran more electrical stuff so they required more shielding on the cables
the 4wd ones also had additional relays i the fuse box and the abs trigger time was both later and less effective so as to stop the transfer box killing itself under repeated heavy stopping
that "gadget" is there to join the pipes rather than using one long pipe
you can use the mechanical bits from either car but you must use the electrical bits from the 2wd or the 4wd cars for each application
the sensors only differ in the amount of shielding they run to stop the signals getting interfered with from other sources and, from memory they were something silly like 104 108 and 112, but what the numbers mean i have no idea
the bigger numbers were from the granadas as they ran more electrical stuff so they required more shielding on the cables
the 4wd ones also had additional relays i the fuse box and the abs trigger time was both later and less effective so as to stop the transfer box killing itself under repeated heavy stopping
Thats great info thanks, so if im using a 4x4 loom its best to use a 4x4 pump so all the electrics are correct? Do you know why the reservoirs are different between the 2wd and 4x4. Is it some thing to do with the turbo position?
the pump and stuff will still hook up exactly the same, it's the ecu and stuff that's different
can't remember if they are green for the 2wd and red for the 4wd but they have big stickers on them so you don't mix them up
and the resivours are on different sides as you say to stop the fluid from heating up when they are fitted to cars with the exhauts on one side or the other, they are simply reversed
the pump and stuff will still hook up exactly the same, it's the ecu and stuff that's different
can't remember if they are green for the 2wd and red for the 4wd but they have big stickers on them so you don't mix them up
and the resivours are on different sides as you say to stop the fluid from heating up when they are fitted to cars with the exhauts on one side or the other, they are simply reversed
so basically the more weight the car has at the back he valve has something inside it possibly a ball bearing, so it increases the braking pressure accordingly to the back, 4wd are built onto the valve block on the inner wing
the ecus and abs looms are different aswell as sensors
the pumps are different aswell as they swapped the bottle over
when most people convert to 2wd from 4wd its easier just to take the shafts apart and leave the cv joints in so they use the 4wd sensors still
so basically the more weight the car has at the back he valve has something inside it possibly a ball bearing, so it increases the braking pressure accordingly to the back, 4wd are built onto the valve block on the inner wing
the ecus and abs looms are different aswell as sensors
the pumps are different aswell as they swapped the bottle over
when most people convert to 2wd from 4wd its easier just to take the shafts apart and leave the cv joints in so they use the 4wd sensors still
This is getting hard work . I have a 4x4 loom & ecu and 2wd running gear so how do i get this to work? I have yet to buy a pump and valve block.
first why don't you think about it for a bit and see if you think that the braking requirements under near locking conditions are the same for a car whose front and back wheels are effectively joined, and one where they are not. if you can answer that, that should tell you what ecu you need to use, as that is what reads the sensors and based on their rate of change starts to limit the pressure front and back.
the red plug will not sim[ply fit into a green ecu and vice versa as there are some pegs to prevent it
That's incorrect, the red plug will plug straight into a 2wd ecu, but if its the other way around the 4x4 ecu either needs a small roll pin removing or a little notch cutting in the outer connector cover.. Either of which will take less than a minute to carry out so I don't see your point!
My point is that it will just plug on!! Red plug 4x4 connector WILL plug straight onto a 2wd ECU!
4x4 plug has the notch
So will fit 2wd as there's no notch on a 2wd connector.
He is right I tried it today. 4x4 loom, 2wd Ecu. The Ecu is cooked as it's been in a mates garden but yes it fits in the plug. I'll let you know when I power it up. Thanks martin.
It's only taken me 6 years to get around to fitting the loom
4x4 plug will not plug directly into the 2WD ECU I have, not a problem that can't be sorted with a file but the pin layout is different between the two plugs.
Thanks for the offer mate, I'm 2WD and the 4x4 ECU is not meant to work properly from what I've read.
Think I'm going to forget the 4x4 loom and tidy up the 2WD one, probably less work than finding out the 4x4 one doesn't do the job and swapping it all over later!
19-10-2011, 11:45 AM
Can 2WD and 4x4 ABS parts be mixed ?
So what did you do in the end? Are we saying 100% that the pump, servo valve etc etc is the same from a 2wd and 4x4 saph? This is doing my head in lol 
