ATTS Problems - Honda Prelude Forum

heitfeka · 09-23-2002, 05:05 PM

I just purchased a 97 type sh lude a little over a month ago and I am experiencing problems with the ATTS. Three times so far the light has come on. Every time it happened, I was starting from a complete stop and turning at an intersection. Twice it acted like it was going to stall, so I let off the gas and looked at the instruments and saw the ATTS light on. The other time it actually did stall. When I arrived at my final destination I turned the car off, turned the key back to the on position, waited for all the lights to go out, and started the car. The first two times I did this the ATTS light went out and was fine. This past time it has stayed on. The previous owner kept all of his records and had a problem with the light. The service department replaced the unit twice for him, both under warenty.

I was wondering if anyone has had or ever heard of similar experiences. Thanks for any help.

ThatPreludeGuy · 09-23-2002, 05:08 PM

Mine sucks like that too, never stalling but it does bog the car for a second. I would reset the ECU by disconnecting the battery for a minute or two and then see what happens. It usually helps for a while.

heitfeka · 09-23-2002, 05:15 PM

I was thinking about that, but I do not have my radio code. Need to call the dealer.

SHLude97 · 09-24-2002, 12:33 PM

i've had the same problem. it's a pain in the arse. something with the O2 sensor usually is the problem, from what i've gathered from the board.

i reset my ECU once a week and that usually helps.
remember that you don't need the ATTS to function. it's an added benefit, yes, but still not necessary for the integral functioning of the car. also, a lot of people in here just disconnect it. basically if it stops working (and you don't have the 1000 to fix the control and head unit) you'll just be driving around in an SH with no ATTS. that shouldn't be that big of a deal unless you're taking the twisties with regularity.

loungmastr · 09-24-2002, 12:37 PM

mine does that occasionally too... about once a month or so. turning off the car and restarting always fixes it for me.

MJShelgosh · 09-24-2002, 12:37 PM

Jumper out the service connector and see what codes you get for the ATTS... I know someone that has the code list for ATTS and Ill see if we can get some more help on this... unless someone else here has one... also.. I think that some of the first generatin ATTS control units had a " bug " in them in which they were replacing the units due to various problems, but I am not positive.. try a search about that one. Oh did you recently change rim size, drop the vehicle execssively?? Or have anything else done to your suspension/handling/rims/tires??

pearl type sh · 09-24-2002, 12:44 PM

i have had it come on when i power slide on some turns..but that is to an extreme of using it. dont know about the dead stop and it coming on. have it checked.

but the ATTS is allso like a chick that is PMS'ing.. AHHAHAH
to tempermental.

SHLude97 · 09-24-2002, 12:53 PM

Quote:

Originally posted by MJShelgosh
Or have anything else done to your suspension/handling/rims/tires??

good point- i didn't have any problems with it until i lowered my lude with HR sports. 1.75 inch drop. i'm wondering if that has something to do with it.

MJShelgosh · 09-24-2002, 12:58 PM

Quote:

Originally posted by SHLude97

good point- i didn't have any problems with it until i lowered my lude with HR sports. 1.75 inch drop. i'm wondering if that has something to do with it.

Yup.... The honda tech told me that there are pseed sensors inside the unit that. when you change rim size.. throw the sensor off.. ( only drastic rim size change.. like a 19" or something... I know poeple with 17" that have no problems. ) Also.. if you drop it too drastically it throws off the sensors/contrl unit.. so keep that in mind. I personally have a 1.3 all around drop with the Eibch pro kit.. and no issues.. I want to get 17"" when my tires wear out.. so well see..!! check the service code though...

heitfeka · 09-24-2002, 03:08 PM

Quote:

I think that some of the first generatin ATTS control units had a " bug " in them in which they were replacing the units due to various problems, but I am not positive.. try a search about that one

I searched for a while on the internet, and found this:

http://prelude.vtec.net/gen5/faq/tsb.html

Date: 3/17/97
Applies to: Type SH
Number: 97-024
VIN range: JHMBB6...VC007624
Problem: ATTS Light On / DTC 78
The ATTS control unit may occasionally turn on the instrument panel ATTS indicator, shut down the system, and store a DTC 78 when there is no real problem.
Corrective Action:
Inspect the part number of the ATTS control unit. Replace if it is not an updated unit.

Old unit P/N: 48310-P5P-003
New unit P/N: 48310-P5P-013

But the part numbers do not match with the ones I found from the previous owner: 48310-P5P-305
supposedly the control unit

I went to a few sites to try and check the numbers but found nothing. Any info would help.

Quote:

Oh did you recently change rim size, drop the vehicle execssively?? Or have anything else done to your suspension/handling/rims/tires??

No the car is completely bone stock

Also, I do have something from the prev owner, which are several copied papers from Mitchell Repair Information Company. These talk about testing the ATTS by raising the front end, going in reverse to 6mph, stopping, setting and release parking brake, and then going frwd to 12 mph. This is supposed to reset the system. If this doesn't work, they say to find and clear DTCs. The prev owner found code 78-1 and 79-1.

I was given a 3 month 3,000 mile warranty when I bought the car, but I am not sure if the ATTS is covered.

I understand that ATTS is not needed but I am one of those guys that like my car to be perfect and hate it when something is going wrong.

I appreciate all your help. I am hoping to get some info before I do anything to it myself and f*ck it up, since most of my experience is with old muscle cars. Also I would like to fix it myself and not pay the ungodly labor charges.

heitfeka · 09-24-2002, 03:44 PM

Also found this thread:

ATTS Question

clean_green · 02-09-2011, 01:53 PM

Sorry to resurrect his old thread but my 97 SH is having ATTS issues now and the dealer tells me that I need a new ATTS control unit. The best price that I can find a new one for is just under $400 at Majestic Honda so I'm trying to find a good, used unit. Does anyone know what model year Honda cut over to the latest 48310-P5P-305 model? TSB 98-002 was issued in March of 1998, so I'm thinking the '99 models may have it?

ThatPreludeGuy · 02-09-2011, 04:21 PM

At this point you can probably find a used one for dirt cheap, I would assume all years would be interchangable but I couldnt say for sure. I think I sold mine for like $35 on ebay after I did my JDM swap.

clean_green · 02-09-2011, 04:32 PM

Quote:

Originally Posted by ThatPreludeGuy

At this point you can probably find a used one for dirt cheap, I would assume all years would be interchangable but I couldnt say for sure. I think I sold mine for like $35 on ebay after I did my JDM swap.

they will interchange but the earlier ones are prone to be bad too. I just put in one from anther 97 and it was bad too. I'd rather find a later model unless I can find a dirt cheap one

Cruiserdude · 02-09-2011, 07:20 PM

I wish I could help you out, but I ended up re-using my stock USDM '01 control unit in conjunction with the JDM Type-S ecu, because it oddly seemed to work better than the JDM '98 Type-S control unit did. I've got the JDM unit in my garage, but I don't know if it would work any better for you. Besides, I'm not sure I want to get rid of it just yet, so I unfortunately can't offer it to you dirt cheap, sorry!

Alikat · 02-10-2011, 10:23 AM

May be totally obvious and off base....but you do know that you have to change the ATTS fluid at every 60K, right?

clean_green · 02-10-2011, 10:55 AM

Yes, I had all of my fluids changed at 100K miles and I'm now at 145K. When I first started seeing the ATTS light, I took it to the dealership for a diagnostic and the code said one of the oil pressure sensors was out so I replaced it, then a new code popped up saying that the control unit needed replacing.

clean_green · 03-23-2011, 03:55 PM

An update on this issue. I replaced the ATTS control unit with a completely new one from Majestic Honda and the ATTS light is still on. I took it to the dealership again and they said that it is not even throwing a code now. They have a call in to American Honda for help but have heard nothing as of yet. George is getting frustrated! (Seinfeld ref

)

ThatPreludeGuy · 03-23-2011, 04:31 PM

Yeah mine used to come on in the summer when I'd used the A/C, when it was time to swap motors I ditched it for a JDM OEM LSD trans. I liked it but the LSD was better IMHO and no more worrying about the dumb light coming on at random times. Sorry its not working out for you yet, keep us posted though it will be interesting to here what the problem was once its figured out.

Kronn 98SH · 03-23-2011, 06:31 PM

Did you try pulling the ATTS code via the 2pin connection?

Did you try resetting the ATTS unit via the procedure outlined in the Service Manual?