04 MDX Wont catch gears unless sits along time. - Acura MDX Forum : Acura MDX SUV Forums
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post #1 of 17 (permalink) Old 03-18-2019 Thread Starter
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04 MDX Wont catch gears unless sits along time.

04 MDX after sitting for a day it grinds and catches 1st or reverse. But thats it if i drive in 1st a bit then take it out of first its done. It feels like it wont build up enough pressure to go back in gear and its just floating in nuetral in any gear no grinds doesnt even try and go into gear. Im thinking its the cloged internal filter? Im gonna try and drop the tranny and open the bell cover then remove the filter also jump test the solenoids while im in there. I have a obd2 but Id like to buy a scanner to test the solenoids before i take it apart but. I got p0980 p0974 p2770, D5 blinking, VSA, cel, maint required light, tpms light, vtm lock light sometimes comes on after reving it. Is there any point in wasting my time or shoud i try removing the filter. When i disconect the lines theres no pressure just dribbles out. It started as intermitten slip out of gear and now it only goes into 1st with a long grind and i got one shot at moving it then no more driving if i take it out of gear. Will go in revrse or 1st sometimes only after sitting is this because of pressure finally equallizing after sitting. I put the thick lucas no leak into it at first but that made it worse and now its like this. I changed out 5 qts and it mabey helped it just begin to grind better makes me think filter? I took off the external solenoids no junk in the screens. When i have it open ill check the 4 internal ones for screen buildup. Check the filter and check for the splines on the tourque converter shaft the meets at the rear main seal. I have no idea about transmissions but read about this alot. Sprag gear? Sensors? Bad pcm? Open in wire harness? I dont know. I have a mdx cd shop manual and a multimeter but the filter is what I know i can mabey do. Im not good at diagnoses but i guess im gonna learn over the next couple months. This has been the bane of my existance for all winter and up here on the east coast Canada im on an ice driveway no garage freezing temps still till halfway through april. Parts cost way more with shipping and theres no big places local. Anybody read this far and recognize these symptoms? Any help would be appreciated. I searched the forums for months yes I found the videos of the teardowns and the intenal filter swap for b&m external tran filter. The radbypassed cooler was already on it when i bout it. The external solenoids i jumped 12v bike battery they worked. I blew compresses air through backwards hoping a last ditch effort to clean out some junk off that internal filter for a test seemed to do something slamed into gear for a minute then back to not going into gear unless it sits for a day. My output speed sensor it not torn up and i back probed and got a 3v on one of the wires? Its old and has other wiring issues a trailer an alarm the back hatch was all cut messed with wiring redid that for the rear plate lights n backup camera. I paid 3500 and got another 3 or 4 grand f parts in it so far so dont want to junk amd cantafford a rebuild unless i do it myself cant belive i am even thinkin of doin that ill probly ruin it even more. Anyways shoot in the dark here mabey one of yous guys out there knows whats up with this. Thanks either way. Will update with pics and proper write ups if i do something soon. Help!

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post #2 of 17 (permalink) Old 03-18-2019
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Ouch. I hate seeing someone go through something like this.

First off, having a laptop with the HDS (Honda Diagnostic System) on it, along with the appropriate interface box would be a HUGE help, as you could monitor the status of the shift solenoid A (the one that's indicated as bad by the P0980 OBD code). You can even manually set it with the HDS, to check for the (subtle) mechanical "click" when it changes state.

The error code suggests that the computer isn't seeing the coil on the Shift Solenoid A, which would indicate either the solenoid itself has failed, or a connection (wire / connector) isn't making a complete circuit.

I believe you can test the coil on the solenoid by just taking off the PCM connector per the following instructions. Don't know if it's really necessary to jump anything (would assume that the solenoid is wired across the connector directly, but I could be wrong). Anyway, here's the troubleshooting procedure for the P0980 OBD code, as well as the "important page" for how to get to the Shift Solenoids.




I have NO idea why I can't post images (I've posted hundreds here before...). Here are links that will hopefully work...

http://www.habcycles.com/mdxp0980a.jpg
http://www.habcycles.com/mdxp0980b.jpg
http://www.habcycles.com/mdxp0980c.jpg
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post #3 of 17 (permalink) Old 03-18-2019
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I would start at steps 16 and 17. That way if you have an out-of-spec. solenoid, you save yourself a lot of troubleshooting time.

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post #4 of 17 (permalink) Old 03-29-2019 Thread Starter
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THANKYOU Habby and Bluepill! You guy's seem to be goto guys on here since I been reading this mdxers stuff, thanks your service you guy's are like Mechanic soldiers spreading the knowledge thanks. I'm gonna check this way that you said with my volt meter and see what the spec is in my manual I been watchin you tube how to test for circuit integraty and the 5 volt reference 12v feed and good powers and grounds, got a voltmeter at Canadian Tire for 10 bucks, and my old man gave me a basic fluke with 3 settings, I will try and upload the CD I bought on ebay off some dude in Florida here somehow. I'm just changing this from fixing my car to a learning experience, I'm goin all out stupid yes, a pussy no! So I got a rebuild kit in the mail, and a shift kit, B&M filter setup, Raybestos clutches. the x is down out of service so i'm tearing it apart and rewiring-ish and rebuilding the tranny not the bearings or geras only the sprag gear low inner race from acura on route and an ebay sprag one way gear thing, to smack in the outter race with a socket race driver or sommethin, also gonna get a foot press and puller tools for the pullin gears off the shaft and bench buddy to polish the valve bodies, i'm all in so i'm riding this ship down and you all can watch and if I get it done that means you can do it to. Gonna put some links on here and up load all whats up with this cuz I havent seen any 04 MDKA teardown rebuilds on the youtubes or on here. Stay posted so you can make corrections to what i'm saying as I go so ppl dont follow along if I f something up and post it as how to. Thanks again for the response it is greatly appreciated and I will try and earn my worth by making this thread something at least not garbage but something good for readers with this issue, if it turns out to be the sprag issue which is what i'm thinking. Mostly cuz of this, which is dead on whats up with my mdx but also I have a gut feeling you guys are right on with the wiring since up here wires last like 10 winters and then there toast. K here is a couple diagrams that might help others in the future and i'll put a pic/video link and more as I go untill i fix this, I don't care if it takes me all year, I will be tackling this in order to progress to the next level. Thanks dudes. I'd buy you all a round of beers but i'm way the f up here and my mdx wont frikin drive!!!
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post #5 of 17 (permalink) Old 03-29-2019 Thread Starter
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Cool

So I got 5 or more youtube videos and I can't post them cuz I don't have enough time in here yet. So i'll hurry up and wait more hahaha.
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post #6 of 17 (permalink) Old 03-29-2019
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Good on you, way more energy than my tired old bones have. Keep posting updates of the tear down and rebuild.

2004 Slate Grey Pearl
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post #7 of 17 (permalink) Old 03-30-2019
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Dustyrandall, good on ya, mate! (I used to live in Australia). ;-) Just remember that like most things, none of the individual steps in what you're taking on are going to be too bad. It's just that there are a LOT of 'em.

There are a lot of things that can go wrong, so be careful when you've got your tranny laid out on the bench. I think it's quite possible you're right about the Sprag clutch thing - that is a "common" failure (in a relative sense).

BUT (big but) don't try to "symptom troubleshoot" by looking for the most similar symptoms on the 'net. That can end in disaster. Thing is, you KNOW you have a P0980 error code, which tells you that Shift Solenoid Valve C (not A) has a problem (wiring or a bad solenoid). THAT can cause the kind of problems you're seeing, and will be about 5% of the effort to fix. Yeah, you could have a bad Sprag clutch AND a bad shift solenoid, but that would be a little like getting hit by lightning twice the same weekend.
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post #8 of 17 (permalink) Old 4 Weeks Ago Thread Starter
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Hey so I got the parts in the mail like a month or two ago but the 3 b's in my life been keepin me sidetracked - beer, bikes, & *****es 😃

So ill try and upload the pics also i got some broken tables from work and fixed them, now i gota shop set up haha, and i got some local northeast coast beers so im bavk at the rig fixing. Sorry for the late updaye but up here in kanadakosh we aint get no next day mail like them southern folks lol. Here y'ALL go.
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post #9 of 17 (permalink) Old 4 Weeks Ago Thread Starter
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Here is all the parts that showed up so far.
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post #10 of 17 (permalink) Old 4 Weeks Ago Thread Starter
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The shift kit that changes when the tranny pressure decides its enough to shift a gear.
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post #11 of 17 (permalink) Old 4 Weeks Ago Thread Starter
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The trans rebuild kit aint nothin but clutch disks metals disks and the friggin gaskets and seals n o rings.
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post #12 of 17 (permalink) Old 4 Weeks Ago Thread Starter
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The rebuild kit is the box with the circles in it. Yes thats a kz1000 gas tank off the only bike i crashed! Mad max style.
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post #13 of 17 (permalink) Old 4 Weeks Ago Thread Starter
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Habby guy did you see the gas tank? Hahahaha lol.
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post #14 of 17 (permalink) Old 4 Weeks Ago Thread Starter
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Before this gets to deep here are the instructions that came in the rebuilt kit also the shift kit which is sold seperately and not required. I just got it cuz im all in at this point and also i have the sprag and inner race on route. As well as set of gear pullers, and a foot press, as I plan on doing this to at least 3 more vehicles this summer if i learn how successfully.
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post #15 of 17 (permalink) Old 4 Weeks Ago Thread Starter
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And this is the rebuilt kit instructions here.
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