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[Mk2] [Turbo] Power steering
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poj20




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PostPosted: Fri Oct 20, 2017 9:10 am    Post subject: [Mk2] [Turbo] Power steering Reply with quote Reply with quote including images

[list=]hi all , does anyone have or know where to locate a wiring diagram for power steering to a mk2 mr2 . K reg thanks in anticipation mick[/list]
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pbmr2
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PostPosted: Fri Oct 20, 2017 9:32 am    Post subject: Reply with quote Reply with quote including images

yeah, in the BGB.

what's your problem?
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poj20




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PostPosted: Fri Oct 20, 2017 9:41 am    Post subject: Power steering Reply with quote Reply with quote including images

[list=Thanks for reply , power steering not working , itís at local garage and the auto electrician canít get it to work , so was asking me for diagram of wiring . Excuse my ignorance , buts whatís bgb ? Cheers[/list]
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Pauln
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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Fri Oct 20, 2017 11:42 am    Post subject: Reply with quote Reply with quote including images

BGB = Big Green Book = workshop manual

I've never seen the original manual but assume it must have had a green cover [Smile]

There are various online versions around, just google mr2 bgb.
eg. 1991 Mr2 Turbo BGB

When you say the power steering doesn't work, I assume the p/s warning light is coming on and the steering is very heavy. Often that's just due to a sticky relay, which you can usually clear by turning the ignition on and off about a dozen times. If you haven't tried that yet, might be worth it before getting stuck in to major fault finding.

Paul
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poj20




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PostPosted: Fri Oct 20, 2017 4:06 pm    Post subject: Power steering Reply with quote Reply with quote including images

Hi Paul , yes youíre right about light and heavy steering , Iíll try and see what happens . Cheers
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pbmr2
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PostPosted: Fri Oct 20, 2017 6:26 pm    Post subject: Reply with quote Reply with quote including images

yeah relay, big round one on the left hand side of the frunk. on the suspension tower.

http://carpron.com/multisite/d/387310-1/photo+2+_3_.JPG?g2_GALLERYSID=9c73b3f7bb4e3cf83e183b479a3bdf62
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shinny




Joined: 27 Nov 2006
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1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Fri Oct 20, 2017 6:48 pm    Post subject: Reply with quote Reply with quote including images

Wiring diagram: http://shinny.co.uk/toyota/MR2_SW_1993_ELECTRICALWIRINGDIAGRAMS/ehps.pdf

(Likely not a perfect match to your car, but a very good start)
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poj20




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PostPosted: Sat Oct 21, 2017 6:08 pm    Post subject: Power steering Reply with quote Reply with quote including images

Thanks guys
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poj20




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PostPosted: Sat Dec 02, 2017 8:25 am    Post subject: Power steering Reply with quote Reply with quote including images

Well after garage having car for six weeks , still no joy in fixing electrical problem . I supplied wiring diagram for the car but they itís no good , not the relay , they say the problem is in the ecu . Anyone had similar problems and a solution or point me in right direction ? Thanks in advance .
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Marty J




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PostPosted: Sat Dec 02, 2017 9:39 am    Post subject: Reply with quote Reply with quote including images

There is a fuse in the frunk which is marked ABS (even if your MR2 does not have ABS), it's also for the power steering. You might want to check that too.
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poj20




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PostPosted: Sat Dec 02, 2017 12:17 pm    Post subject: Power steering Reply with quote Reply with quote including images

Cheers , Iíll tell him .
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poj20




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PostPosted: Tue Dec 05, 2017 9:21 pm    Post subject: Reply with quote Reply with quote including images

Hi, any experts on power steering ? Problem seems to be in the ecu . Anyone had similar problems and how did you rectify it ? Thanks in advance mick
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Pauln
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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Tue Dec 05, 2017 11:59 pm    Post subject: Reply with quote Reply with quote including images

As I understand it, the ECU uses the speed sensor signal to turn the power steering off at high speed to avoid your steering becoming too "light".

So in theory I guess it's possible that an ECU fault could keep the power steering off, though I don't recall every seeing any mention of that happening.

When folks use a simple inline electronic speed converter on JDM models around the back of the speedo, this usually fools the speedo into thinking your going slower than you really are ie 70 kph rather than 70mph. Unfortunately this can also fool the power steering into thinking the same, so it doesn't turn off at high speed.

If however a Stef clamp converter/delimiter is bolted directly onto the back of the speedo gauge, this works differently and only modifies the signal going to the speedo, leaving the signal going to the power steering unchanged.

It's a really long shot, but if you have a Stef type converter it's possible that a fault in the line that passes the speed sensor signal to the power steering could be a possibility. But that really does feel like clutching at straws.

Given your mechanic seems to think this is where the problem is, if you can borrow another ECU, it's very easy to swap them over to prove whether that really is the problem.

Have you actually taken the cover off the ECU to see if there are any obvious signs of component failure?

Paul
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poj20




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PostPosted: Wed Dec 06, 2017 6:54 am    Post subject: Poet steering Reply with quote Reply with quote including images

Hi Paul , I havnt done anything as I havnt a clue but he and an auto electrician are baffled , he said he looking for an ecu with same numbers ?? are you saying any ecu would be ok as long as itís off same year and model ? Heís had it six weeks already . Cheers
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Pauln
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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Wed Dec 06, 2017 10:30 am    Post subject: Reply with quote Reply with quote including images

No the ECUs are model specific so it's best to stick with the correct number, as there are variants within models like with cruise control, etc.

As your turbo is K reg, I'm assuming this is a rev2. Rev 1 and 2 ECUs have a red block around the number on the label, whereas rev3+ usually have a black block.

A couple of the capacitors in the rev2 ECU are very prone to leaking/blowing with age. This usually results in more serious running issues rather than just losing the power steering. But if they leak this can easily cause damage to the tracks on the circuit board inside the ECU, but this is very easy to spot if the take the cover off.

Unfortunately finding a good s/h rev 2 ECU can be quite hard as there don't seem to be so many of them around as the rev 3. As I found out when I had to replace mine a couple of years back after the car had been left standing in the body shop for over 6 months.

Breakers like MR2 Ben may be able to help, but it won't be cheap which is why it's best to see if you can borrow one for a swap first to make sure this is the issue.

You could try putting out a plea on here to see if anyone in your area can help.

Paul
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poj20




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PostPosted: Wed Dec 06, 2017 12:46 pm    Post subject: Power steering Reply with quote Reply with quote including images

Ok thanks for your help and time ,Iíll put this to him and see where we are cheers mick
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markstevieandmads




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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Wed Dec 06, 2017 4:02 pm    Post subject: Reply with quote Reply with quote including images

I think pauln could be getting confused between the main ecu and there is a seperate power steering ecu too which is more likely to be the problem. Also these are more easily available.
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poj20




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PostPosted: Wed Dec 06, 2017 4:30 pm    Post subject: Power steering Reply with quote Reply with quote including images

Oh ok , where will that be located ? Cheers
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Pauln
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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Thu Dec 07, 2017 1:11 am    Post subject: Reply with quote Reply with quote including images

markstevieandmads wrote:
I think pauln could be getting confused between the main ecu and there is a seperate power steering ecu too which is more likely to be the problem. Also these are more easily available.


Yes, sorry for confusion, I thought the speed sensor signal went via the main ECU, but looking at the wiring diagram again it actually splits at a junction point and then goes to both the main ECU and the power steering ECU.

The power steering ECU can be found in the frunk. There are a few on ebay at the moment, just make sure the part number matches that on your existing unit.

Paul
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poj20




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PostPosted: Thu Dec 07, 2017 6:09 am    Post subject: Power steering Reply with quote Reply with quote including images

Hi , Iím glad there are people like you on here to help . Havnt a clue with cars . Thanks again mick
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