abs computer

[Finfon]

my abs computer is broken i tested it as lofty described when i first joined this bbs (thanks lofty btw) the light stays on in the car indicating a blown computer,i might have sourced a replacement from a member on here anyway is there a difference between turbo - n/a and auto / manual computers? my car is a n/a auto btw. I need to change it after a near miss the other night :flush:
cheers
Paul

[Lofty]

It looks to me like the ABS ECU was different on 86-88 and 89+ card. Take a look at the EPC (http://www.cygnusx1.net/supra/library/EPC/MKIII/parts/89540.html) and you will see what I mean. It doesn't show a difference between NA and turbo cars.

[Finfon]

cheers lofty if i have a look at mine i can get the relevant numbers to compare with the replacement to see if theyl work
thanks
Paul

[MKS]

so what yeah is ya car Finnon ?

[Finfon]

so what yeah is ya car Finnon ?
87 d reg MKS

[Finfon]

i had a look at the label on the skid control cpu 2day
it says:-
skid control
89540-14010

so it must deffo be an early one and not changed at some point

[Delphius]

i had a look at the label on the skid control cpu 2day
it says:-
skid control
89540-14010

so it must deffo be an early one and not changed at some point

If the one you've sourced isn't the right one, I've got one, same part number going spare. It was off a D reg N/A manual.

Mark.

[MKS]

89541-14010


guess its different :( sorry man

[Finfon]

89541-14010


guess its different :( sorry man
ney botha chap thanks for your help anyway :yes:

[Finfon]

right got my new abs comp today thanks delphius :notworthy
but the light is still on :crybaby: the check conector is the one coloured whitejust behind the actuator isnt it? and not the other one as i checked for a fault code from the white one
also to check it i turn the ignition on then unplug it dont i? then see what the light does
sorry for posting this i tried the trsm but it was being so slow id be a skeleton before i fix my brakes

on the old comp underneath the part number there is these numbers:-

079400-0254

on the new one:-

079400-0253

is this just a serial number or something?

[Finfon]

just a thought do i need to reset anything to clear old fault codes?
cheers

[Delphius]

just a thought do i need to reset anything to clear old fault codes?
cheers

Sorry to hear the computer didn't make a difference.

What fault code are you getting when you disconnect the ABS link?

According to the diagnostic info in the link below, to erase the ABS codes, all you do is disconnect the ABS check connector, then depress the brake pedal 8 or more times within 3 seconds.

Here are some links that may help:

The brake system index is here:

http://www.cygnusx1.net/supra/library/TSRM/br/BR_01.html

I'd advise running through the troubleshooting guide which is here:

http://www.cygnusx1.net/supra/library/TSRM/br/BR_02.html

And details of the ABS diagnostics are here:

http://www.cygnusx1.net/supra/library/TSRM/br/BR_51.html

Are you sure it's not an ABS sensor down, or something wrong with the actuator?

How did you get to the point of making the decision it was the computer at fault?

Sorry for all the questions, but I'd like to try and help...


Mark.

[rodgill]

just a thought do i need to reset anything to clear old fault codes?
cheers
if yer need any abs bits let me now,as i am breaking a couple of supes :crybaby:
free to a good home :)

[Finfon]

if yer need any abs bits let me now,as i am breaking a couple of supes :crybaby:
free to a good home :)
ill get on it tomorrow or the weekend at the latest your in yorkshire
where abouts? if its easy travelin distance ie somewhere close to leeds i might be able to come round
cheers
Paul

[Finfon]

Sorry to hear the computer didn't make a difference.

What fault code are you getting when you disconnect the ABS link?

According to the diagnostic info in the link below, to erase the ABS codes, all you do is disconnect the ABS check connector, then depress the brake pedal 8 or more times within 3 seconds.

Here are some links that may help:

The brake system index is here:

http://www.cygnusx1.net/supra/library/TSRM/br/BR_01.html

I'd advise running through the troubleshooting guide which is here:

http://www.cygnusx1.net/supra/library/TSRM/br/BR_02.html

And details of the ABS diagnostics are here:

http://www.cygnusx1.net/supra/library/TSRM/br/BR_51.html

Are you sure it's not an ABS sensor down, or something wrong with the actuator?

How did you get to the point of making the decision it was the computer at fault?

Sorry for all the questions, but I'd like to try and help...


Mark.
hey mark its no bother it could be a new fault or i havent cleared old fault codes properly when i checked it 6 months ago that was the only fault there maybe more now

i checked the tsrm i did what it said to get the fault code and the light stayed on constantly which according to the trsm is a shafted comphaving said that ill try it again and see what happens

thanks for every ones help ill look into it again tomorow
once again thankyou :notworthy everybody

[Finfon]

just had a look at the trsm ill have a go tomorrow see if theres another fault
i hope this isnt goin to be one of those weekends youl know what i mean if youv seen my thread in the chit chat section :banghead: :crybaby:

[rodgill]

ill get on it tomorrow or the weekend at the latest your in yorkshire
where abouts? if its easy travelin distance ie somewhere close to leeds i might be able to come round
cheers
Paul
just down the A1 from you at Leeming Bar. :)
don't wait too long only got one left, due to lack of room. :rant:

[Finfon]

right i tried again for fault codes i must have had a :blonde: moment last time i checked as i disconected the wrong wire on my car the plug is black and at the front of the abs actuator it read i think 3 codes:-
code 23 - open or short circuit in 3 position solenoid of rear wheel
code 32 - left front wheel speed sensor signal malfunction
code 34 - open circiut in front speed sensor
so now i think i have a spare abs computer as the one i removed may not have been faulty oh well so tomorrow im going to try cleaning them all up and check for loose conections is this advisable? will it be all 3 speed sensors? if so how much are new ones approx? are they toyota only parts? its goin to be expensive isnt it :crybaby:
cheers
Paul

[Finfon]

can the speed sensors be cleaned up using brake cleaner? this fault is doin my head in now sometimes it works most of the time it doesnt id love to know why the bloke i bought the car of didnt investigate further

[Delphius]

can the speed sensors be cleaned up using brake cleaner? this fault is doin my head in now sometimes it works most of the time it doesnt id love to know why the bloke i bought the car of didnt investigate further

The tsrm mentions cleaning the faces of the ABS sensors of rust. Because they work on a magnetic principle, any rusty cr*p build up near them would cause them to malfunction. I'd just give them a wipe.

The same goes for the notched bit of the wheel hub that the sensor "senses". Any crap filling the notches would cause the sensor to not sense the notches.

The other thing is as for any intermittent electrical problem: check the wires aren't chafed, unplug the connectors, give them a squirt of WD40 and connect/disconnect them a few times to get rid of any corrosion on the contacts.

Finally, check your earthing points. Near the ABS computer and any used by the ABS sensors. You may have rust under the earths and that's a surefire way of generating dodgy electrics!

Mark.