Help! Y'all know how the Jap spec autobox has that power/hold switch? I need to know what pins it connects to on the autobox ECU. I have a UK spec, so don't have the switch. But I need the hold function so I can get a decent run in 3rd on a rolling road. It just didn't wanna know trying in 2nd - too much wheelspin! I had a look at the online manual... couldn't find it. Anyone got any ideas? I need to get this switch wired up soon... like, tomorrow if possible.

Leave the overdrive off and that is 3rd gear.

 

Jeff

Yeah, tried that... with overdrive off, it's still kicking down. Even with the kick-down switch disconnected it's doing it. Needs that hold switch. Or something like shift-at-will... but I aint gonna be able to make one of those by tomorrow ;) Is there anything in a Consult (a real one) that could fix it in a gear, or is it monitor only?

Noone know?

Blimey, still nothing?! Guess all you guys with Jap autos don't own a multimeter! I thought MrP would know, even if he h'aint got auto n'more.

I assumed the difference between the UK and J spec autos was a bit more complicated than just a switch!

 

I would have thought that the ECUs were different at the very least, if not the gearboxes themselves.

It cant be that simple to tell the autobox to stay in 3rd or 4th, otherwise they'd do that at rolling roads :confused:

 

Pete

On UK spec, you can't make it set off in second like the jap spec on hold, as it's not the same box, either mechanically or electrically!! Sorry!!

 

Paul N

Pete - yeah, you can... but you have to be a bit trick about it. 4th you probably can't but you wanna be doing a rolling road session in 3rd (ie. 1:1) anyway. That's what the hold button is for - you get it up and running so it's in 3rd (40 odd mph?) then hit the hold switch and jam your foot on the go-pedal and it /shouldn't/ kick down. AFAIK, that's what they were doing at the rolling road day with Jap autos.

 

Paul - the Jap / UK boxes aren't /that/ much different, but it doesn't matter anyway... how they function is down to the autobox ECU, and they are the same in both cases. The UK just doesn't have the power/hold switch wired up - there's a few blank pins in the UK manual (book, dammit) but it doesn't say what they're for. I simply need to know what pins to wire the switch up to - there's only, like, two wires... and maybe a ground! Someone's gotta know!

Nah they used 2nd gear, I discussed it with the guy operating, hence why autos redlined in about zero seconds LOL.

The Hold button/switch on a Jap box , when switched on merely locks 1st gear out , so that you pull away in 2nd, for slippery conditions , ice , mud etc , it does not "hold "the transmiision in any gear ratio,,,!!

To stop it going to top gear, 4th , overdrive should be switched off and then it stays in 3rd.

Thats why the more modern Auto boxes have 1,2,3,D,N,R,P, so you can select a particular gear ratio.:slap:

Aaargh!

 

Pete - OK, understood. But I absolutely can't do mine in 2nd (same rolling road, btw) because it just lights up the rear wheels as soon as it starts making boost! Too much damn pooooooooer!

 

JD - the way I understood it, yeah OK, you /can/ pull away in 2nd using hold, but you can also use it to prevent kick-down (in my case from 3rd to 2nd). It /must/ work, and if I'd had time to go poke around in a Jap auto I'd have had the switch wired up by now. I'm just hoping Pete (SE) doesn't tell me to p*ss off later when I turn up after work (multimeter in hand)... cos it's sounding like none of you feckers wanna tell me what the wires are! ;)

 

Incidentally, even in "modern" auto boxes (unless they're switched to semi-manual) it only limits it to the max gear - if it needs to, it'll still kick down. So that's no help anyway.

Now I really am PMSL...

 

All this discussion about how to get an auto box into a particular gear!

 

I've had a great new idea! Let's have cars where the driver gets to choose which gear to use... we could call it something like... what's the opposite of "automatic"... I know... MANUAL!

 

:slap:

Cheers for that zevans... very helpful! ;) This thread aint gonna turn into another auto vs manual one. I'll just say: what's being attempted on the rolling road is something you'd probably *never* wanna do in reality - stuff it in 4th at 2K and floor it all the way to 7.5K! And the autobox ECU knows just how wrong it is. So I dunno why you're so PYSL... in this case, a manual would simply allow you to get your driving in reality totally wrong.

 

Talking of being able to get the right gear tho, if anyone's interested I will be (*FACT* as a certain mod might say) making my own shift-at-will... not cos I wanna make one, but because the guy that used to make them doesn't any more. Pete's said SE could fabricate the shift paddles, so if you want one, you know who to ask (that's SE, not me!).

 

Right, hating to answer my own friggin' question, the pins on the autobox ECU are (and it's possible I've got these swapped):

 

Hold: 42

Power: 38

 

Apply 12V to the pin to get the function to work. I'd be wiring it up right now except it's cold and dark out, and I've just opened a bottle of Bud. Plus there's a Project Gotham 2 in my XB waiting to be played. So... I'll let you bunch of useless feckers know if it works tomorrow :D

iirc in hold mode it will still kick down if you floor it, but it wont kick down under normal driving at all (well, not full bore anyway ;)).

Ah, but is that because of the full-throttle kick-down switch tho? It's disconnected on mine at the mo.

the kickdown switch is only about 3/4 way down the pedal travel though. You said yourself you disconnected the kickdown switch but it still kicked down, it detects full throttle usage from the TPS signal.

Yeah sure. I think the kick-down switch is actually near full throttle. But anyway, I'm saying it's still kicking down without it connected but it *shouldn't* if I had it in hold mode... which I can't do because I've got a UK spec without the switch. I'll find out tomorrow. I just hope there's time to get it on the rolling road again - need the rest of that mapping done so I can make some real horses! :D

Originally posted by 51x

Cheers for that zevans... very helpful! ;)

 

 

LOL couldn't resist. I've got a serious point then...

 

You just said (and I agree) that in hard driving in the real world, the ECU (or the hooman bean in a manwell) will keep your revs over 4k anyway - so why care about the behaviour of the engine below the range you're gonna use? If you're after more power, surely you want it in the power band anyway?

 

Anyway more power to your elbow, it's a proper bit of hacking, who cares if it's any use?

:dance:

Originally posted by zevans

You just said (and I agree) that in hard driving in the real world, the ECU (or the hooman bean in a manwell) will keep your revs over 4k anyway

Did I? Blimey, my memory must be going. But anyway...

 

- so why care about the behaviour of the engine below the range you're gonna use?

Err... well you kinda have to use low revs at some point, especially in an auto cos you can't exactly slip the clutch and pull away at 4K. I don't really get your question TBH. Yeah, the majority of power (and increase in power) is up the top end. My point about autoboxes not letting you get it wrong - I mean like, if you accidentally stab it in 4th instead of 2nd with a manual.

 

So... I got the switch wired up this morning... got the 12V pin wrong so had to make a minor mod. But now the Consult is reporting my hacked-in Hold switch is working... on my UK spec autobox ECU and box. Dunno what you guys were on about - Jap box being electrically different!? TBH, I can't tell if it's functioning as it should be. I guess we'll see next week when it goes on the rollers (no time today).