D4 always lit

[xkjnboix]

Ok.[sigh] Ive been tryin to solve this problem since last year. for those of you who care to take the time reading this you've prob never heard of anything like it.

[Most times when the weather is wet, damp, moist etc this happens.]

I start the car and D4 is always lit no matter what gear im in... sooooo when I turn it on im in P and D4 sooo when I go to reverse im in R and D4 and then when I put it in d4 I start out in the equivalent of 3rd gear (which as you know if u put ur car in 3rd as your 1st gear u will go NOOOO WHERE AT ALLLL)

So to start off I have to put the car in 1st (which means 1 and 4 are lit up)
1st gear is equivalent to the real 1st gear but 2 3 and 4 are all the same gear which is equivalent to 3rd.

So pretty much I have two gears (1st and 3rd)

Now ive replaced the transmission soooo I know it’s not the transmission that’s causing the problem...

Today ive taken out the TCU and looked at it and there is no corrosion, moisture, or any apparent problems with it. Sooo I put it back together and sealed all the cracks w/ silicon to make sure it’s not a moisture problem

Pretty much after the car has been running for like 10-15 mins the D4 will blink off and the shifter will make the same sound as when you press the break to go from P to any gear.
Ive taken the center console out and noticed it was a little box and it seems to have a magnet in it.... ive tried taking the box appart but it’s like u cant (no bolts or screws in it.) and u can’t really take it off because it’s attached to the plastic in the mechanizm

I do notice a ticking sound when the error is going away underneath the car of close to the cylenoids.... I couldn’t really pinpoint where exactly (making the sound it does when you press the break to shift out of P)

sooo really im at a standstill cause I cant diagnose the problem ... im pretty sure its spittin me a code but I don’t wanna go to the dealer and them b like oh welllll u gotta spend like 800$ to fix it...sooo if you’ve heard of this before or know a solution then feel free to give me insight.

Im sorry but I hate program cars... all the shit eventually breaks or like malfunctions... id rather a stripped down car and deff a stick, but of course only sunroofs, rear calipers, rims, etc. come stock on the luxery models (and its very rare to find a an EX or V6 4door in stick) but to make our car a manual it would cost 3k ( and I don’t have parts or labor people to get hookups from soooo yeah, don’t post about me converting, I would appreciate that, ty ^_^ )

[tuner2be]

my friends d4 light stays on all the time too.

[93accordexcoupe]

i bet u its the TCU,u really dont notice much on them by looking at it when they go out on u

[xkjnboix]

yeah i opened it up and it looked brand new ( like its soooo clean ) no moisture or burn marks or n e thing.
ill go to the junk yard and try out a TCU since thats wha everyone thinks
thanks for the input guys

[accordaffair]

Hey, we talked in the chat when the site was down, I would def. try another tcu first. And you can pull the codes yourself, no need to go to the dealership yet. (If ever)

[xkjnboix]

srry idk how to pull codes but yeah i remember u ^_^ i was tryin the silicone trick that was discussed on there but its not really helpin soooooo yeah imao try another tcu.
ty for the help

[accordaffair]

I think if the tcu's messed up already, it won't help, but you can seal the new one if theres a lot of moisture getting in.

[xkjnboix]

yeah i know that but there wasnt any moisture in there
but yeah if anything its prob the TCU thanks ^_^

[xkjnboix]

its been about a week and a half since i sealed the TCU its been running fine ( i even left it uncovered in the rain ) im hoping that did the trick but i dont wanna jynx myself

and anyone else havin this prob, can take notes cause ill keep ya updated ^_^

[xkjnboix]

wellll the silicone only worked but like 2 weeks sooo i finally decided to pull a TCU from a 92 93
it works fine now SO FAR sooo if it jacks up again i know its something else

thanks again for the support guys ^_^

[xkjnboix]

yeah its been over a month now
about the same length of time i gave my silicone sealed TCU a try out
no problems ( hopefully it'll stay that way ) but im pretty sure it was the TCU but its fine now

thanks agin guys

[accordaffair]

Good to hear that. I hate to hear about ghost problems that people chase forever and never get fixed. Like my old 90 lx...