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Ecu
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poj20




Joined: 28 May 2005
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PostPosted: Mon Dec 11, 2017 9:21 am    Post subject: Ecu Reply with quote Reply with quote including images

Hi ,!looking for an ecu for rev 2 mr2 I have numbers of my existing one , but i
Would like to borrow one initially to eliminate if thereís a problem with mine . Willing to pay . Thanks in anticipation mick[/list]
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Crazy95




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1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Tue Dec 12, 2017 12:42 am    Post subject: Reply with quote Reply with quote including images

what engine model? got 3sfe ecu here
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poj20




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PostPosted: Tue Dec 12, 2017 6:00 am    Post subject: Ecu Reply with quote Reply with quote including images

Hi , 3sgte , thanks anyway , appreciate your time, mick
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markstevieandmads




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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Tue Dec 12, 2017 7:22 am    Post subject: Reply with quote Reply with quote including images

The rev u posted before was for a rev 2 turbo.
Also check these for blown capacitors and damage to tracks as this is known to happen on these models.

However i believe you need a ps ecu not the main ecu as previously stated
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poj20




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PostPosted: Tue Dec 12, 2017 12:16 pm    Post subject: Power steering Reply with quote Reply with quote including images

Hi ,it is a rev 2 turbo . Mechanic says heís had all that checked and thinks itís the main ecu .says heís changed p/s ecu . I donít know anything about them so in his hands really , cheers
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markstevieandmads




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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Wed Dec 13, 2017 8:09 am    Post subject: Re: Power steering Reply with quote Reply with quote including images

poj20 wrote:
Hi ,it is a rev 2 turbo . Mechanic says heís had all that checked and thinks itís the main ecu .says heís changed p/s ecu . I donít know anything about them so in his hands really , cheers


Id get it to a specialist. In 10yrs ive never heard the main ecu failing taking out the ps. Normally gives other symptons.
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PW@Woodsport
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PostPosted: Thu Dec 14, 2017 7:32 am    Post subject: Reply with quote Reply with quote including images

I'll second that, in 20 years running an Mr2 specialist garage i've never heard or seen the engine ECU take out the power steering, having said that there is a pin on the engine ECU that does have the ability to turn the PS off.

That pin is called PSCT, but it is very easy to check if PSCT is causing your PS not to work, just disconnect the engine ECU and turn ignition on, if the PS now works then the PSCT pin is causing it, if the PS still doesn't work then it has nothing to do with the engine ECU.

For info you can quite happily cut the PSCT wire if it is causing a problem and the PS will work as normal, no need to buy an engine ECU.
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poj20




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PostPosted: Thu Dec 14, 2017 3:33 pm    Post subject: Power steering Reply with quote Reply with quote including images

Hi , thanks Paul , Iíll pass on info cheers mick
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poj20




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PostPosted: Thu Dec 14, 2017 5:23 pm    Post subject: Power steering Reply with quote Reply with quote including images

My mechanic says heís swapped all of system in the trunk , relays and ps ecu . Says they have had it working , works when first start car then packs up . How does he identify psct pin/ wire in the main ecu ? Cheers
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Pauln
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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Thu Dec 14, 2017 7:22 pm    Post subject: Reply with quote Reply with quote including images

The psct connections between the power steering ecu and the main ecu are shown on this diagram as a lilac and yellow cable.

Wiring Diagram

This also explains how it works, and basic checks that can be made with a meter.

Paul D
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poj20




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PostPosted: Thu Dec 14, 2017 8:46 pm    Post subject: Ecu Reply with quote Reply with quote including images

You sir are a star !!!
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Eksterminator




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PostPosted: Mon Dec 25, 2017 12:59 pm    Post subject: Re: Ecu Reply with quote Reply with quote including images

poj20 wrote:
You sir are a star !!!

Have You sorted out the problem ?
I got various MR2 ECU's including the REV2 Turbo.

And BTW - You can check any pin out just opening ecu cover (4 screws - You don't even have to disconnect the ecu) and every pin got it's description shortcut on the PCB next to it's soldering point.

What I DO NOT recommend is following the advice to cut any wires !
Sooner or later it may cause some problems.
Humidity usually damages any modified wiring pieces so when anything starts to fail - I check the stuff first...

Instead You can simply unplug any wire from the connector.
You need to flip the plastic flap locking all wire terminals in place and than using a needle press the metal flap preventing it to slide out of the connector an pull it out - it takes 1 min. to do it and You don't need to damage anything - no soldering required (I'm not even talking about using wires clip on connectors - using them is playing roulette).
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PW@Woodsport
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PostPosted: Tue Dec 26, 2017 10:14 am    Post subject: Reply with quote Reply with quote including images

Quote:
What I DO NOT recommend is following the advice to cut any wires !


If PSCT was causing the problem the circuit can be safely cut without any further problems and will fix his issue without the need for a new ECU, so i stand by that advice even if it seems extreme, cutting one wire in my eyes is nothing if it means saving him money.

On V6 conversions for example, PSCT doesn't even exist, and they work perfectly fine without it.

[thumleft]
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Pauln
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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Tue Dec 26, 2017 11:04 pm    Post subject: Reply with quote Reply with quote including images

PW@Woodsport wrote:
Quote:
What I DO NOT recommend is following the advice to cut any wires !


If PSCT was causing the problem the circuit can be safely cut without any further problems and will fix his issue without the need for a new ECU, so i stand by that advice even if it seems extreme, cutting one wire in my eyes is nothing if it means saving him money.

On V6 conversions for example, PSCT doesn't even exist, and they work perfectly fine without it.

[thumleft]


I've no wish to get involved in the cut or no cut discussion, but am curious about what the PSCT connection is actually for, ie under what circumstances would the main ecu turn off the power steering, or is this connection just letting the main ECU know power steering is operational?

Paul
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poj20




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PostPosted: Wed Dec 27, 2017 9:44 am    Post subject: Ecu Reply with quote Reply with quote including images

No problem not solved , heís took the main ecu out , shown me a wobbly connection saying itís burnt out , I donít think he disconnected main ecu from p/s ecu . Three months heís had it now . Iíve to spreak to him when heís open again to see if he followed previous advice . Shown him all diagrams etc but no progress ?? Iíll report back after speaking to him , I think he would speak to someone if anyone willing to give him advice over the phone . Cheers
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PW@Woodsport
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PostPosted: Wed Dec 27, 2017 9:50 am    Post subject: Reply with quote Reply with quote including images

I believe it's there to tell the PS ECU that the engine is running, and to give the engine ECU the ability to turn the PS off when it wants to.

We've observed though that it doesn't seem to make any real world difference to be concerned about wether connected or not.
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markstevieandmads




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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Thu Dec 28, 2017 12:59 pm    Post subject: Reply with quote Reply with quote including images

Just get it to a specialist that knows what they are doing
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Pauln
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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Thu Dec 28, 2017 4:22 pm    Post subject: Reply with quote Reply with quote including images

Whats actually burnt out?

Was the wobbly connection on the main ecu on the outside where the connectors fit, or inside on the pcb board.

Rev 2 ECU's are prone to blown capacitors, which can usually be repaired provided there's not too much damage to the PC.

But three months is an awful long time for a "mechanic" to be looking into this and then just come up with a wobbly connection that's burnt out.

I have to agree with markstevieandmads it really is time to take your car to a specialist with a better understanding of the MR2.

Paul
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poj20




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PostPosted: Fri Dec 29, 2017 7:23 pm    Post subject: Ecu Reply with quote Reply with quote including images

Hi ,it is on the mother board , a cylydrical component I think , but I donít know why heís removed the ecu at all as every thing but the p/s was fine ?? Iíll post more when Iíve seen him in new year , thanks to all for info .
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Pauln
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1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Fri Dec 29, 2017 8:01 pm    Post subject: Reply with quote Reply with quote including images

OK, well that's probably a blown capacitor which ought to be replaced for long term reliability of the ecu. The problem with these capacitors is when the blow they can leave a nasty deposit on the pcb which will slowly eat into the tracks and cause other issues.



These are two photos I took of my ECU after I'd replaced the two capacitors circled in red. They are numbered on the circuit board. Capacitor C810 is on the main (larger) board close to the output terminals, so I suspect this is what he's talking about. Capacitor C512 is on the smaller (daughter board).

These two seem to be the most prone to blowing in the Rev2 ECU. My previous ECU was pretty much destroyed by this issue. So when I obtained a replacement, the first thing I did was to open it up to see what state they were in. I was lucky, only one of them had just started to show signs of leaking, so I replaced both as a precaution so as to avoid future problems.

Having said that, I've not heard of damage to these capacitors causing problems with the power steering. More usually it's idling or running issues.

Paul
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