Torque Convertor lock up instal

[LeighW Avid PP Poster! Find all posts View Profile Close LeighW]

I don't think the lock up will be the issue either, I would be more concerned with
the clutch packs and their not being designed to take the full engine load when
changing gears, same for spider gears etc, if you have a motor spinning at
3000 RPM and gear changes up and you have to suddenly absorb 1000 RPM
with considerable inertia behind it may not be good for the clutches or gears.

I believe if the manufacture unlocks the torque convertor before changing gears
he mostly likely does it for a good reason and without knowing what it is I would
try and keep the same functionality in any after market mods.

Would you rev your motoring to 1500RPM then throw it into drive, no you wouldn't
because as you know it would not be good for the gear box, but with torque convertor
locked and changing gears is more or less the same thing.

If you ride a motor bike then you would most like up shift without using the clutch as with straight cut gears and quick changes where engine speeds quickly fall to match transmission speeds up shifting without using the clutch is normal. You wouldn't do the same down shifting though as your then have to speed the motor up and all you do is lock up the rear wheel and put a hell of a load on everything.

If you only intend to keep the car for a short time then it may not be of concern.

[Davis Dieso Junior Member Find all posts View Profile Close Davis Dieso]

Good points Leigh. It is going to be this exact thing I will be going to find out. I personally don't think it will be that dramatic though. I think the clutches would be subjected to similar loads and slip under heavy acceleration. Not very often I drive like that. As I've stated before, I don't experience what i would call, excessive slippage. Doesn't seem to be much different to normal. But, I may have to eat my words down the track, so I'll just see how it goes. Time will tell.
Cheers, Jamie.

[chardo Junior Member Find all posts View Profile Close chardo]

Hi Jamie, I have been following your super installation for some time now, as I tow a 17 ft Jayco pop top and have the 5th gear slipping in and out quite a bit while travelling. Because my prado is 5 speed there is a difference in wire colouring and placement. I have a Haynes workshop manual I have been looking through and I think I can seen where I am going. I helped my nephew install a lock up kit to his 200 series from Automotive Services. It had a resistor/heat sink looking gadget on it. Is this needed on my model. Has anyone else with a 5speed diesel carried out your installation that you know of???? My last trip to Broome from here near Darwin was not too bad,but knowing about the your lock up kit had me thinking each time 5th gear unlocked on a small incline. My nephew said his was brilliant on the way home to Bunbury, saved some fuel too. OK must go, thanks for the great kit. Cheers Bill.

[chardo Junior Member Find all posts View Profile Close chardo]

Hi out there, has anybody with a 5 speed auto prado carried out Jamies Lock up Kit. I am about to buy the bits and pieces for it, but I admit that even though I carry out all my own mechanical work on the prado, I don't know much about the relay side of things and how to read the diagram. I have a Haynes workshop manual and I think I have worked out the colours or the wiring needed in the system (different to Jamies, mine 2007). I am up to Darwin today to get the diodes and wiring need,(have bought relays on Ebay like Jamie) so the main thing I need is someone to clarify that I am looking at the right wires, etc. Thanks and cheers Bill.

[MRW82 Member Find all posts View Profile Close MRW82]

Interested to know what wire is for the 5 speeds lock up solenoid too. Been waiting for my auto leckie to get back to me with an answer from his wiring diagram. I've got conflicting info from different sources so have been hesitant to go wildly chopping into it.
I'll get onto him again tomorrow and let you know what he says.

[Davis Dieso Junior Member Find all posts View Profile Close Davis Dieso]

Hi Jamie, I have been following your super installation for some time now, as I tow a 17 ft Jayco pop top and have the 5th gear slipping in and out quite a bit while travelling. Because my prado is 5 speed there is a difference in wire colouring and placement. I have a Haynes workshop manual I have been looking through and I think I can seen where I am going. I helped my nephew install a lock up kit to his 200 series from Automotive Services. It had a resistor/heat sink looking gadget on it. Is this needed on my model. Has anyone else with a 5speed diesel carried out your installation that you know of???? My last trip to Broome from here near Darwin was not too bad,but knowing about the your lock up kit had me thinking each time 5th gear unlocked on a small incline. My nephew said his was brilliant on the way home to Bunbury, saved some fuel too. OK must go, thanks for the great kit. Cheers Bill.

Hi Bill,
I know what you mean, they are a pain in the but the way they unlock and kick back the gears so early. Cant even get to put the boot into it. It is a heap better with the lockup convertor. It will still kick back, but more when its really necessary rather than when it thinks it needs (too bloody early).
Go back to page 3 and see if the article I wrote about the 5 speed box helps you out at all. The 5 speed is completely different as explained, it earths out to lockup, no power fed. Has 5 plugs not 4. Different coloured wires, etc etc. Check it out and let me know how you go. The diodes I used may not be needed for the 5 speed and depends on how you wire it. It is only required for the "N" and "P" lock out relay. ie: to prevent lock up while in N or P.
Cheers, Jamie
Cheers, Jamie

[chardo Junior Member Find all posts View Profile Close chardo]

Hi MRW82 and Jamie, Thanks for getting back to me. Just when I thought I was getting my head around the system you have kyboshed me again.
You are right with the lock up wires being green/red, yellow/red.Thats what they are in my bible.
I also found that the wires going to the gearshift lamps are green/red - Neutral and green/white - Park.
I have your plan of attack here in front of me, but now I don't know what you mean when you say it earths out to lock up. I can do most anything on the vehicle, but this has me baffled. I really don't know where to start, I think I could have followed the original plans. Is there any way you can update them for me PLEASE.
I think we need to find out how to get some refreshments to you by the looks at what you have already done here in pradopoint.

What year is your prado MRW82. I have a prado bible here with me. Does my spiel help you out any. I can look up most of the bits from 1996 to 2009 in this book. Doesn't mean I understand it all though. OK thanks for getting back to me and I will go back to another beer while I think about it. Does anyone need to fit a trans oil temp gauge in their prado. I worked out a cheap easy way. Helps a lot to see what is going on in there. Thanks and cheers Bill.

[MRW82 Member Find all posts View Profile Close MRW82]

Hi bill mines an 08 D4D. I'd love a copy of this bible if at all possible, or a lead of where to get one. Pm me if you prefer.

I had missed Jamie's post on page 3, I'll have to recheck my wires to see if I get a match up.

Thanks, mark.

[chardo Junior Member Find all posts View Profile Close chardo]

Hi Mark, The bible is a Haynes Repair manual for Toyota Prado from 1996 to 2009. Includes Series 95 and 120. Petrol and diesel, 4 and V6 cylinders. I bought mine in Repco for $48 a year ago.It tells you anything and everything you need to know about the beasts. Mine goes in the prado wherever we go.
You were asking about hooking the lock up to the "LO" light in the suspension lights. This is in the bible as well. It is the NB wire - Brown/black in the "C" connector, terminal 18. It seems to be in behind the glove box near the transmission plug somewhere.Hope this helps.
I am lost now with the wiring, Hope Jamie has a trick up his sleeve. Cheers Bill.

[MRW82 Member Find all posts View Profile Close MRW82]

Oh ok. Thought you might have a Toyota factory service manual. I'll have to get myself a Haynes. Thanks again.

[MRW82 Member Find all posts View Profile Close MRW82]

Got myself a Haynes manual. What a gem of a book. I've sat down and done some research and here's what I've come up with for my setup in the 1kd-ftv. Would like opinion from those in the know if I've missed something or got anything wrong.



NOTE: I have not installed this yet and therefore cannot confirm it works, I am asking for opinions before I give my prado the chop chop.

One other thing in the 1kd-ftv is that the TCM is under the drivers side, between the steering column and the diagnostics plug. Still haven't been able to find the SCM plugs though.....

[chardo Junior Member Find all posts View Profile Close chardo]

Hi Mark, glad you like the bible, I am going to have a good look at your diagram in a minute, but I noticed the SCM the other night while looking around the book. Try looking at Page 12-119,right at the bottom left No. 20- SCM. It is over very close to where the TCM is on Jamies model on the passengers side under the glove box. Cheers Bill

[LeighW Avid PP Poster! Find all posts View Profile Close LeighW]

MRW82,

Just a question, why not use a relay with two sets of change over
contacts in place of relays two and three?

Not sure what terminal 87 labeling reads but by rearranging the circuit it would appear
you could get away with one double pole double throw relay instead of three, ie

ie relay is normally operated to prevent lock, this means when in park or neutral
relay operates to restore wiring to normal, on/off switch would also operate relay
to turn off? Down side would be if relay fails then you would have lockup by default.

Cheers
Leigh

[chardo Junior Member Find all posts View Profile Close chardo]

Im keeping my fingers crossed for you Mark, You have lost me. I noticed that you have deleted the brake relay that Jamie has in. The lock up kit I helped my nephew install didn't have one either. It just had an on off switch in the dash. It would stall his motor if not switched off before stopping.It also had a resister included in the wiring. I don't know what that was for, though they warned that it got quite hot and to place it in a good open spot. The kit was for a Toyota 200 series from Wholesales Automatic transmissions. OK mate Im watching with eyes wide open. Cheers Bill.

[MRW82 Member Find all posts View Profile Close MRW82]

Leigh, thanks for the feedback. I like your idea of simplifying it down to one relay, although I don't like the idea of a relay failure locking the torque converter ON. Fail safe is a good thing to consider. Does a standard single relay fail in the open position (would the activation relay fail open so the torque converter would just operate as per normal?)

Pin 87 on the LO light relay is (incorrectly) labeled '(earthed) via dash switch illumination' but after posting it up I realised that switch light illumination needs to come from the dash/headlight circuit. So pin 87 will just go to earth.