Offroad-Express

As some of you may know, i got my truck submerged in water, filling all diffs and gearbox with water.... So i decided instead of spending $300 on a flush, to just buy a decent new auto for $500, as mine was already slipping. Got the new box in and if i put in 'D' it would start in 3rd(i think) if i put into '1' it would start in 2nd(im pretty sure, it may be first but not sure) Also with old box, and most autos i have driven, when rolling back in reverse, then selecting 'D' it just smoothly takes off, But with mine its like a launch..
I know the box is good, as i test drove it, and the torque converter looked brand new(wrecker seemed to think it had been overhauled recently, dont think he was overly happy about the price agreed before removing it)

I have tried a new trans computer, but it is still doing the same thing...numbers on the computer were different, but was from an auto D21 so cant be that much different?

Hoping someone might be able to give me a solution?

Cheers

Sounds very much like limp mode to me. Would have thought the trans computers would have been the same though. I would have a look at the looms and check that the plugs are clean and connecting properly and that the trans comp is getting all the right signals.

meatc wrote:Sounds very much like limp mode to me. Would have thought the trans computers would have been the same though. I would have a look at the looms and check that the plugs are clean and connecting properly and that the trans comp is getting all the right signals.

I made sure that every plug i unplugged during the swap is plugged back in, and i tried another new computer(this time one with exactly same part number) and its was still the same. It must be just an electrical issue, but finding it is going to be difficult...

Cheers for that.

This gonna sound dumb but check the shift switch, that is the lever on the side of the box, and make sure that it is in the right places for the shift lever. Also chack the switch/lever is aligned right. The switch works off the lever to tell the comp what you want but they can misalign, it may have takne a knock, then you saying you want 1st is tellling the comp you want second etc. (The fowards gears are a manual to be fowards and electronic to which one is actually selected.)

If you get real stuck I have a full service manual (PDF) for a car with the same box, it has all the wiring, faults etc, I can prob try and get the relevant section out of it and sent it to you. (the whole doc is 900pg and about 45mb)

meatc wrote:This gonna sound dumb but check the shift switch, that is the lever on the side of the box, and make sure that it is in the right places for the shift lever. Also chack the switch/lever is aligned right. The switch works off the lever to tell the comp what you want but they can misalign, it may have takne a knock, then you saying you want 1st is tellling the comp you want second etc. (The fowards gears are a manual to be fowards and electronic to which one is actually selected.)

If you get real stuck I have a full service manual (PDF) for a car with the same box, it has all the wiring, faults etc, I can prob try and get the relevant section out of it and sent it to you. (the whole doc is 900pg and about 45mb)

Do you think by just looking i should beable to tell if its misaligned? Im hoping that work might have a scanner that i can connect to it and see if it brings up any faults, will find that out tomorrow.

Thanks alot

Cant remember if the terrano is cable or shaft shift, but loosen the adjusting nuts off on both sides of the fiting that goes into the lever on the box. Select Park on the shift lever in the cab then make sure the lever on the box is all the way back and adjust the nuts to suit, then shift all the way to first and loosen them again to check there is no variance. As far as adjusting the switch to the lever on the box, there is a simple process, I just cant remember what it is. I cant lay my hands on the memory stick with the doc on it at this stage, but will find it in the morning and pluck a few pages out that should assist. Its got all the pin outs and stuff to check signals etc, pretty basic to do if you can follow the charts. PM me a email addy and I will send thenm through

meatc wrote:Cant remember if the terrano is cable or shaft shift, but loosen the adjusting nuts off on both sides of the fiting that goes into the lever on the box. Select Park on the shift lever in the cab then make sure the lever on the box is all the way back and adjust the nuts to suit, then shift all the way to first and loosen them again to check there is no variance. As far as adjusting the switch to the lever on the box, there is a simple process, I just cant remember what it is. I cant lay my hands on the memory stick with the doc on it at this stage, but will find it in the morning and pluck a few pages out that should assist. Its got all the pin outs and stuff to check signals etc, pretty basic to do if you can follow the charts. PM me a email addy and I will send thenm through

Definitely cable shit for gearbox, lever for transfer. I'll loosen off the nuts in park etc tomorrow after work and see what i come up with.
Pm'ed you aswel, Thanks alot for your help!

Cheers

Bump, still needing some help for this. 99% sure its electrical as i remember the last time i drove my truck with old box, it would select low gear in D. Is there fuses for any of the gearbox somewhere?

Thanks in advance.

Ive found with my Terrano if its in hold it will not select 1st stage of the tranny but if i run it in the other two stages on the switch it will go down to 1st stage are you sure its not stuck in the hold pattern ?.

u13turbo wrote:Bump, still needing some help for this. 99% sure its electrical as i remember the last time i drove my truck with old box, it would select low gear in D. Is there fuses for any of the gearbox somewhere?

Thanks in advance.

long wrote:Ive found with my Terrano if its in hold it will not select 1st stage of the tranny but if i run it in the other two stages on the switch it will go down to 1st stage are you sure its not stuck in the hold pattern ?.

u13turbo wrote:Bump, still needing some help for this. 99% sure its electrical as i remember the last time i drove my truck with old box, it would select low gear in D. Is there fuses for any of the gearbox somewhere?

Thanks in advance.

Switch definitly isnt on hold, that is for sure, how am i meant to check if its stuck in hold though?

Hey, sorry i hadn't got back to yah, we shifted since I last used my manual and I cant find the flashdrive its on. , It'll be here somewhere, and I'm running out of unopened boxes to choose from. i did find the stuff I printed when I wired my truck but it doesnt have what you need I'll keep hunting.

meatc wrote:Hey, sorry i hadn't got back to yah, we shifted since I last used my manual and I cant find the flashdrive its on. , It'll be here somewhere, and I'm running out of unopened boxes to choose from. i did find the stuff I printed when I wired my truck but it doesnt have what you need I'll keep hunting.

Hey mate. dont worry to much about it though, only if you get time. cheers

Guy at work took alook today, reckons it could be the tps/stepper motor ontop of the injector pump. just wondering if anyone knows how to test these?

If you check the voltages at the tps, with key on-engine off, you will find a 0v, 5v (possibly 12v) and one that varies from 0-5v as you move throttle.
Make sure your multimeter earth lead is on battery -pole.
Slowly move throttle through range of motion and check that the varying voltage is smooth, has no sudden rises or dropoffs.
The voltage that its set to at idle affects kickdown operation, sorry its been ages since I've adjusted one so I cant remember what idle voltage they should be.
Hope this helps

Sweeeet thanks for that, its the most likely cause of the issues i think. I'll give that ago as soon as i can get my hands on a voltmeter

So i checked the voltage on the tps. one was 2.6volts, one 12v, and one like 6 i think? reving didnt change any of them, they always stayed the same. Also i unplugged it and went for a drive, nothing changed, same symptoms. Im guessing it could be buggered?

have ya got anyone ya know who has same kinda 4wd as you..if so park next to it and start swapping sensors , tps etc until it runs fine...then go and buy that said sensor ..saves cash and time...that's what i did after last swim and trans swap.....

yeti wrote:have ya got anyone ya know who has same kinda 4wd as you..if so park next to it and start swapping sensors , tps etc until it runs fine...then go and buy that said sensor ..saves cash and time...that's what i did after last swim and trans swap.....

Yeah very true, i dont know anyone off hand with an auto one. And also, the tps, is it an injector pump out job or does it just bolt ontop easily?

Tps will unscrew off the top of pump pretty easily (just be careful not to drop any bits)
It definitely should make a difference if you unplug tps from a good going one, but as yours doesn't then it does point at tps being at fault.
And no changing voltage with throttle shaft moving isn't a good thing...
See what you can find on trademe etc, mistral will be same or anything td27 auto thats not late model with efi pump. Probably rd28 or td42 from a laurel/safari would work too

slide wrote:Tps will unscrew off the top of pump pretty easily (just be careful not to drop any bits)
It definitely should make a difference if you unplug tps from a good going one, but as yours doesn't then it does point at tps being at fault.
And no changing voltage with throttle shaft moving isn't a good thing...
See what you can find on trademe etc, mistral will be same or anything td27 auto thats not late model with efi pump. Probably rd28 or td42 from a laurel/safari would work too

Sweet as! thanks alot for your help mate.