I'm(still) trying to get rid of the check engine light on my 2001 Sport, caused by my AW4 trans swap. My Sport came with the Invecs-II transmission, which I swapped out for the 30-43le(AW4)(with aftermarket controller) in order to use the NP231 t-case. Now I get four or five trouble codes all having to do with transmission solenoid and shaft speed sensor failures. My plan to fix this was to get The ECU and harness from the 97-99 Sports that came with the 30-43le and swap that in, but I'm having trouble finding that stuff for reasonable $$.

So, I read and heard that the 98-06 mitsu computers are reprogrammable. Has anyone done it themselves, or know of a shop that will do this? I just have to get the computer to ignore the trans that is no longer there. Since the 30-43le is manually controlled I don't need any computer controlling, (I shift it manually). Thanks in advance for any advice.
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Three years later and I'm still wondering about this.^^^

Anyone?

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Welcome to my world.

'97, '98 and some '99 ECMs are not flashable. No how, now way, so forget that idea. Nor are they re-chipable - already pursued that and was shot down. When the Sport went from an ECM to a PCM is the cut-off. ECM are not flashable, (most) PCMs are. I had to hunt high and low to get a '99 3.5L PCM that was - there are VERY few and AFAIKT, the ONLY '99 that is flashable is the 3.5L PCM, so ....

Tactrix. Unfortunately, the process for us is somewhat of a PITA. You'll be starting from scratch. I checked the other day and there still aren't any images for us that someone else has already noodled through. I was successful in pulling from my '03 and pushing back to my '03, but that's all. I stopped there. I'm not interested in learning XML and spending months and months on this as I don't plan to ever go beyond '99 - the newer Sports are too hard to turn into crawlers.



All Mitsu computers are not created equal. The Montero and Montero Sport are a world unto themselves.

Anyway, ...

You can fake out the shift solinoids. I can tell you how if you're interested. The speed sensors ... well, haven't figured that out yet. Take a look at the docs on my site for the 3.0-3.5L swap - ECM/PCM pin-outs. I have notes in there that might be of interest.

If you want more info, let me know. Been working on this for years now. <img src="/forums/images/graemlins/frown.gif" alt="" /> Maybe we can figure out the speed sensor thing. That's where I stopped in retrofitting the '99 ECM to the '97-'98 Sports. Sigh.

Edward

Can you use the MUT-II tool to make the new values the ECU is getting acceptable?

Some among the 3/S camp have found that our 98-99 ECU's are flashable. Relevant to the Monteros? http://chromedecu.org/

Has any one tried to tune with a MAFT?

Danny's problem is that the parts aren't there as I understand his post.

The TCM/PCM checks for the presence of the shift solenoids in exactly the same manner as the ECM/PCM checks the injectors at key on. It runs a resistance check - if it finds too much resistance or an open circuit, it triggers a code and CEL.

The speed sensors are different - like the crank and cam sensors for the engine. If I remember correctly the TCM/PCM checks that the front and rear are there, that their functioning (TCM/PCM is receiving a signal), and that they're in the correct range of each other depending on what gear the transmission is in. I think I remember that correctly.

So, no the MUT can't be used to 'fix' this problem.

Danny is on the right track. This has to be 'edited' out of the ROM. And, I'm not even sure that's possible since some of this feeds data to other functions of the PCM. It depends on how much and what exactly he's 'missing'.

Danny, post back what all is now missing with the tranny swap, the P codes and anything else you think helpful, if you can.


Here's the link to all my notes. The input/output shaft speed sensor diagram isn't workable but the specs are correct. 1999 PCM to 1997 Harness Docs

Edward

Two guys have used the MAF piece of the AEM F/IC 8 on Sports with blowers. Works pretty well as far as I know. I don't have any use for that piece so I haven't fiddled with it.

(FYI: The F/IC 8 supports a frequency MAF; the F/IC 6 will not work on Montero Sports. Probably not the Montero either since I think it uses the same MAF)

Edward

Do you mean 'your' as in your GT/Eclipse/Diamonte? Yes, some/most of those are. The Montero Sport ECM is completely different until you start getting past '00.

Re: Cromed ECU

Expensive. This could run $1000 in hardware/software and cabling. More $$$ for some serious tuning - and you'd need to do some, that's for sure.

I'll have to look at the ROM. We don't have turbos, or blowers, active exhaust, knock sensors .... Maybe for a price we could get a ROM built that would work if its impossible to "turn stuff off" via software.

Might work for Danny if he want's to replace his PCM and spend a lot of time/$$$ tuning. It won't be cheap either way. Sport pin functions differ from the Eclipse/GT/Dimonte/etc. even if the plugs are the same so you need to either hack the factory harness - which I STRONGLY discourage - or get a Boomslang harness.

I'm worried more about the ROM. Lots of stuff interacts in an ECM/PCM. You can't just leave some things disconnected if you don't use them because that can affect how other seemingly unrelated calculations are made which will affect how (or if) the vehicle runs overall.

I don't know how practical this really is. The only thing it gets you since this is NOT a drop in replacement is OBD and the only reason you really need to retain OBD is for emissions testing. So, if you HAVE to have it - as I do - it might be worthwhile. Otherwise, I could put together a MS for less money that would be a lot less of a PITA.

Edward

I see now that I was unclear in the original post. The wire harness for the stock trans is gone, no connection between computer and the new(older model year) trans.


Here are the codes I'm dealing with.

P0740 TCC ckt malfunction
P0750 shift sol A malfunction
P0755 shift sol B malfunction
P0760 shift sol C malfunction
P0765 shift sol D malfunction

Thanks for the tips. ES, I read about the struggle you're having with yours. I'm not looking to spend lots of time and money on mine either. I think I'll keep looking for a cheap 97-99 Sport to grab out the harness, ecm, and tcm.

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