A-110: DIY Guide to replacing 3rd & 4th gear pressure switch for 3G TL (2004-2006) - AcuraZine Community
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Old 05-31-2009, 2:27 PM   #1
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A-110: DIY Guide to replacing 3rd & 4th gear pressure switch for 3G TL (2004-2006)

Since there is no formal guide other than the one in the service manual, I decided to document the replacement of my 3rd and 4th gear pressure switches.

For the record, my transmission has about 35,xxx miles at the time and I am the first owner. The shift quality is decent, I haven't noticed anything unusual other than 3rd gear holding on steep inclines under load. I just recently did a 1x1 drain/refill of the transmission fluid at an Acura dealer as well (about 1K miles ago prior).

Materials needed:
x1 3rd Gear Pressure Switch (28600-P7Z-003)
x1 4th Gear Pressure Switch (28600-P7W-003)
x2 sealing gasket (90471-PW7-A00)
x1 brake cleaner (to wash away residual AT fluid)

Tools required:
10mm wrench
22mm wrench
flathead screwdriver
lift (or jackstands)


On to the pictures.

Click the image to open in full size.

Click the image to open in full size.

I brought my car to my friend's shop (where he did the Accord foglight install). the car was raised and immediately, you will have access to one of the switches. You first undo the two 10mm bolts that hold a shroud, and then unplug the two connectors just so that you can swing the shroud out of the way:

Click the image to open in full size.

to see which bolts im talking about, see this pic from e30cabrio:

Click the image to open in full size.

that open hole in the middle of the pic is for one of the bolts. the TL has two holding that shroud.

the other switch is visible once you remove part of the splash cover along the inner fenderwall. this is what you should see:

Click the image to open in full size.


You will need a 22mm wrench to unscrew each switch from their location. once you got them loose, unscrew by hand. unplug the connectors as you go and reconnect them once you put everything back. I suggest doing one sensor at a time.

Click the image to open in full size.

Now for the details.

I noticed that the transmission housing has moulds on it that actually tell you which is which. Now, those who may know which switch is which may have no problem, but in the event you forgot (like me), one way to determine which goes where is by looking for these indicators, see below:

Click the image to open in full size.

The amount of fluid that drips out is not much, but to get a sense what to expect, I took a shot:

Click the image to open in full size.

You will need to use the brake cleaner to remove the residue of the AT fluid on the parts of the suspension. depending on how much got out and where, you can just spray liberally:

Click the image to open in full size.


Finally a pic of the switches I replaced. 3rd gear on the left, 4th gear on the right.

Click the image to open in full size.



Driving Impressions

Immediately after having these put in, I did notice an improvement of the car's shifting habits. I can't really quantify it much, but the shift from 2nd to 3rd and 3rd to 4th now happen much quicker. Put it in another way, they arent as "sloppy" as before. Even after applying load and a couple of WOTs, they are just noticeably different. Frankly it feels like Im driving a brand new car.

I would definitely recommend this as a Preventive Maintenance item. I likely will do it in around 70K miles just to keep the 35K mile mark I set. for the low cost and ease (even though I personally didnt do it), I think it is a worthwhile investment, along with doing the drain/refill procedure for the 3G TL AT transmission.


thanks to I hate cars for starting the transmission thread and credit goes to those that provided the part numbers as well as e30cabrio for one of his reference pics.
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Old 05-31-2009, 2:32 PM   #2
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Wow! What an awesome right-up! Thanks for creating the DIY
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Old 05-31-2009, 4:10 PM   #3
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Wow! What an awesome right-up! Thanks for creating the DIY
It's been added to the 3G garage A-110!
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Old 05-31-2009, 4:36 PM   #4
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awesome write-up!
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Old 05-31-2009, 5:15 PM   #5
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I'm ignorant... what does this do?
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Old 05-31-2009, 6:08 PM   #6
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Awesome write up!!!!!!!!!!

+1 Matt is a hero indeed
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Old 05-31-2009, 6:35 PM   #7
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Quote:
Originally Posted by gatdammit View Post
I'm ignorant... what does this do?
It is more of a preventive measure for those with the AT transmission on the 3G TL.

I hate cars had started a thread that brought about looking into doing this to prevent transmission failures for owners.

the thread is here:

http://tl.acurazine.com/forums/showthread.php?t=721508

see posts #1, #46, #139. those pretty much tell you all you need to know. personally I felt an improvement and, despite being under warranty, I just wouldn't want to break my OEM transmission and end up getting a reman. I plan to do this as part of my regular maintenance as it doesnt do any harm, and very easily does more good.
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Old 06-01-2009, 12:16 AM   #8
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Does anyone know anywhere in norcal I can have this done? I have the parts already...just need a place/mechanic.
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Old 06-01-2009, 9:09 AM   #9
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Quote:
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Does anyone know anywhere in norcal I can have this done? I have the parts already...just need a place/mechanic.
you can try a local dealer if you have to. otherwise, any regular mechanic should be able to follow the instructions quite easily.
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Old 06-01-2009, 10:59 AM   #10
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Quote:
Originally Posted by sixsixfour View Post
Since there is no formal guide other than the one in the service manual, I decided to document the replacement of my 3rd and 4th gear pressure switches.

For the record, my transmission has about 35,xxx miles at the time and I am the first owner. The shift quality is decent, I haven't noticed anything unusual other than 3rd gear holding on steep inclines under load. I just recently did a 1x1 drain/refill of the transmission fluid at an Acura dealer as well (about 1K miles ago prior).

Materials needed:
x1 3rd Gear Pressure Switch (28600-P7Z-003)
x1 4th Gear Pressure Switch (28600-P7W-003)
x2 sealing gasket (90471-PW7-A00)
x1 brake cleaner (to wash away residual AT fluid)
Hey bud.. nice write up... but,

Those are the wrong P/N's.. Those go to 2G TL's the 1G MDX ('01-'02) and 1 & 2G CL..

I'm not sure on the specs of those pressure switches but the rating for the 3rd Gear should 33psi and the 4th gear is 27psi.. I believe the colors are black/ grey & beige.

The correct P/N for the 3G TL should be:

04-06 TL (Texas Instruments, TI)
28610-RAY-003
28600-RAY-003

also compatible with
05-08 RL
07-09+ RDX
03-09+ MDX

07-08 TL (Washimiya?)
28610-RKE-004
28600-RKE-004

Edit: Don't panic.. just because those pressure sensors / switches go to the gen of crap transmissions doesn't mean they aren't good, the transmission design itself was poor.. but the specs may be different.. I'd change them out and flea bay those if you can't return them.

Last edited by Majofo; 06-01-2009 at 11:02 AM.
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Old 06-01-2009, 11:13 AM   #11
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Quote:
Originally Posted by Majofo View Post
Hey bud.. nice write up... but,

Those are the wrong P/N's.. Those go to 2G TL's the 1G MDX ('01-'02) and 1 & 2G CL..

I'm not sure on the specs of those pressure switches but the rating for the 3rd Gear should 33psi and the 4th gear is 27psi.. I believe the colors are black/ grey & beige.

The correct P/N for the 3G TL should be:

04-06 TL (Texas Instruments, TI)
28610-RAY-003
28600-RAY-003

also compatible with
05-08 RL
07-09+ RDX
03-09+ MDX

07-08 TL (Washimiya?)
28610-RKE-004
28600-RKE-004

Edit: Don't panic.. just because those pressure sensors / switches go to the gen of crap transmissions doesn't mean they aren't good, the transmission design itself was poor.. but the specs may be different.. I'd change them out and flea bay those if you can't return them.
that's odd. I went to three different local dealers and looked them up personally and these are the correct P/Ns. i had them print the sheets out to confirm we were looking at the same thing.
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Old 06-01-2009, 11:17 AM   #12
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Okay I verified that the pressure spec is the same but the body of the switches and possible reliability spec is different. The switches you have are described as stepped body whereas the matching P/N's have a flat body. Did you notice a difference between the new & old switches physically or to the harness connection?
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Old 06-01-2009, 11:22 AM   #13
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Originally Posted by Majofo View Post
Okay I verified that the pressure spec is the same but the body of the switches and possible reliability spec is different. The switches you have are described as stepped body whereas the matching P/N's have a flat body. Did you notice a difference between the new & old switches physically or to the harness connection?
nope, they are identical as far as i can remember. i watched the entire time and the plugs and connectors/harnesses fit fine. im pretty anal when it comes to my car and i went to three dealers to confirm the part numbers (as the transmission thread showed two different part numbers, those with the -RAY- in the middle and those with the P7W/Z in the middle). i specifically asked the three different parts people and had them print out from their screen the part in question.

after i was satisfied, then that's when i proceeded. so the part numbers you pointed out and the ones I got are technically (for all sakes and purposes) work the same and work on the 3G TL.


the entire process (including me interrupting for pics) took no more than 15 mins. nothing fancy was done nor any special fitting. it was all plug and play.
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Old 06-01-2009, 11:24 AM   #14
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This should be the physical verification:

They look the same except for the flush connection.. could be a redesign for several reasons including thermal / reliability, although the actual spec is the same.
Click the image to open in full size.
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Old 06-01-2009, 11:31 AM   #15
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Quote:
Originally Posted by Majofo View Post
This should be the physical verification:

They look the same except for the flush connection.. could be a redesign for several reasons including thermal / reliability, although the actual spec is the same.
Click the image to open in full size.
that's very good information. since the spec is the same, personally I dont think it matters at this point. we checked to make sure the connections were secure and that nothing didn't seat right.

plus, as I've said, I had peace of mind confirming from the (three different) parts department that the switches were indeed compatible. I gave them the part numbers you specified and they were ok.

but thanks for the clarification
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Old 06-01-2009, 11:36 AM   #16
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Whoa.. I started digging a little more to find out why 07/08 had a different P/N.. come to find out there are two 3rd clutch pressure switches for that bad boy.. it was redesigned.. wow..

07-08 TL

#13 (2) & #14
Click the image to open in full size.

04-06 TL

#12 (1) & #13 (1)

Click the image to open in full size.

edit:

Quote:
The standard transmission for both the TL and TL Type-S is an all-new 5-speed automatic transmission with Sequential SportShift and Grade Logic Control. Similar to the transmission in the RL luxury sedan, this two-wheel drive version features thicker and larger gears than the previous automatic for increased torque capacity. It is also more compact than the previous 5-speed automatic. TL Type-S models have an even more aggressive shift program, as well as the Paddle Shifters mounted on the steering wheel. The Sequential SportShift has been re-programmed to provide smooth downshifts by 'blipping' the throttle between gears, matching revs and significantly improving overall driving smoothness.

Optional only on the TL Type-S is a 6-speed manual transmission. For 2007, the transmission has been strengthened for increased durability with the more powerful 3.5-liter engine.
learn something new everyday...

Last edited by Majofo; 06-01-2009 at 11:39 AM.
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Old 06-01-2009, 11:40 AM   #17
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Whoa.. I started digging a little more to find out why 07/08 had a different P/N.. come to find out there are two 3rd clutch pressure switches for that bad boy.. it was redesigned.. wow..

learn something new everyday...
wow thanks! at least we have all this useful information in one place. much easier for those not as fully mechanically inclined like me
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Old 06-01-2009, 11:47 AM   #18
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wow thanks! at least we have all this useful information in one place. much easier for those not as fully mechanically inclined like me
Yeah.. it seems the adding of an addition pressure switch to the 3rd clutch just reinforces Matt & his transmission guys theory.. that the switches failing will cause premature transmission failure or at least reinforces the importance of their functionality.. I wonder how different the clutch specs are between the two sets and which year clutch Matt looked at.. hmm..

we should start calling them 3G & 3.5G.. jeezz.. I'm gonna trade for an 07..
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Old 06-01-2009, 11:52 AM   #19
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Originally Posted by Majofo View Post
Yeah.. it seems the adding of an addition pressure switch to the 3rd clutch just reinforces Matt & his transmission guys theory.. that the switches failing will cause premature transmission failure or at least reinforces the importance of their functionality.. I wonder how different the clutch specs are between the two sets and which year clutch Matt looked at.. hmm..

we should start calling them 3G & 3.5G.. jeezz.. I'm gonna trade for an 07..
I know. Im going to PM a mod to change the title to include (2004-2006 3G TL only)

thanks for the additional info!
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Old 06-01-2009, 1:14 PM   #20
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very nice wright up, I might give this a go over the weekend.
This helps as-well for shift speeds http://tl.acurazine.com/forums/showthread.php?t=728370
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Old 06-01-2009, 2:10 PM   #21
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Great Write-up.
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Old 06-01-2009, 6:27 PM   #22
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I know. Im going to PM a mod to change the title to include (2004-2006 3G TL only)

thanks for the additional info!

Done. Too long for the "only" but I got the year in.

Nice catch majofo.

Looks pretty much like the same procedure for the '07/'08 just different part numbers and the one additional 3rd gear pressure switch, right?
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Old 06-01-2009, 10:25 PM   #23
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Done. Too long for the "only" but I got the year in.

Nice catch majofo.

Looks pretty much like the same procedure for the '07/'08 just different part numbers and the one additional 3rd gear pressure switch, right?
thanks again for the edit!

the procedure seems pretty much the same in a way. and yes, it's an additional 3rd gear pressure sensor/switch for the 07-08 cars.
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Old 06-04-2009, 7:46 PM   #24
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Old 06-06-2009, 11:03 AM   #25
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Isn't the 07/08 a different transmission. Like the one from the RL? And if so, is this maintenance really needed? I haven't heard much of trans failures from those guys? I figgure there's a reason why they changed the transmission on those years...

oh, and AWESOME write-up. I tackled those switches on my 04 a few weeks ago with my 105k service. I can't say I noticed any difference, but for the $$, I don't mind the peace-of-mind if the theory holds true. It made sense to me.

Last edited by NE14RoxCJ; 06-06-2009 at 11:05 AM.
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Old 06-07-2009, 2:19 PM   #26
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Isn't the 07/08 a different transmission. Like the one from the RL? And if so, is this maintenance really needed? I haven't heard much of trans failures from those guys? I figgure there's a reason why they changed the transmission on those years...

oh, and AWESOME write-up. I tackled those switches on my 04 a few weeks ago with my 105k service. I can't say I noticed any difference, but for the $$, I don't mind the peace-of-mind if the theory holds true. It made sense to me.
the 07-08s have an extra 3rd gear sensor/switch to replace, as noted by Majofo above. I believe I read somewhere that they use a tranny similar to/or based on the RL tranny.

for preventive maintenance, these switches are worth it imo. i for one have noticed an improvement within the first few minutes of driving.
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Old 06-07-2009, 2:32 PM   #27
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Nice pictures!!! Its also possible to do this without getting the car on a lift (which my car can't get on )

I was too slow to pictures, but thorough!! Good job
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Old 06-07-2009, 4:20 PM   #28
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Nice pictures!!! Its also possible to do this without getting the car on a lift (which my car can't get on )

I was too slow to pictures, but thorough!! Good job
you can jack up the driver side, put it on a jackstand and remove the driver side front wheel. its just easier to do this on a lift as you can reach behind the tire and replace the sensors that way.
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Old 06-26-2009, 1:50 PM   #29
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added some scans from the service manual:

3rd gear switch:

Click the image to open in full size.


4th gear switch:

Click the image to open in full size.
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Old 06-28-2009, 10:49 AM   #30
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sick write up!! That took a lot time and knowledge, thanks for the great DIY
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Old 07-05-2009, 11:21 AM   #31
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anyone done it on jacks yet? how much harder was it on just jacking up the driver side? gonna do this later today.
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Old 07-05-2009, 11:30 AM   #32
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anyone done it on jacks yet? how much harder was it on just jacking up the driver side? gonna do this later today.
i think it shouldnt be that bad. I personally would remove the driver side front wheel to give you more room. the switches are literally on the other side of the splash cover.
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Old 07-05-2009, 11:55 AM   #33
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thanks. going to do this later. i'll add more pics with the wheel taken off and the car on jacks.
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Old 07-17-2009, 7:45 AM   #34
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Well I just did both sensors and a 3x3 fluid drain. All I can say is the difference is night and day... The occasional vibration I was getting while shifting has not occured since but a few days will tell the full story there, thanks for the awesome writeup.

mk
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Old 07-17-2009, 8:54 AM   #35
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Well I just did both sensors and a 3x3 fluid drain. All I can say is the difference is night and day... The occasional vibration I was getting while shifting has not occured since but a few days will tell the full story there, thanks for the awesome writeup.

mk
that's good news! keep us updated
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Old 07-17-2009, 11:17 AM   #36
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i was planning to change the tranny fluid and pressure switches at 30k miles as some PM... if a writeup for the 07+ isn't up by then, ill take pics of the addt'l switch to add into a writeup...
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Old 07-18-2009, 3:17 PM   #37
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Quick question... how fragile are the sensors? My 2 year old daughter got a hold of them and dropped them from counter height onto a tile floor. They seem ok but not sure if there are fragile internals that might be broken.

Jung
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Old 07-20-2009, 9:31 AM   #38
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Quick question... how fragile are the sensors? My 2 year old daughter got a hold of them and dropped them from counter height onto a tile floor. They seem ok but not sure if there are fragile internals that might be broken.

Jung
They are usually packaged to withstand great mechanical stress. I wouldn't worry at all. The components within should be very durable.
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Old 07-21-2009, 10:41 PM   #39
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anyone done it on jacks yet? how much harder was it on just jacking up the driver side? gonna do this later today.
Did my 04 with 88K this evening. Definite improvement in both up shifts and down shifts. Just bought the car a couple of weeks ago and wasn't satisfied with the shifting. Came back to this forum, had CLs previously, to find a solution. Thanks to all.

Used jacks and didn't remove the wheel. Should have removed the wheel. You have to be pretty ambidextrous to accomplish the task in that tight of space.

Be aware that the wire connectors have a release tab on the end where the wire exits. Just press the tab & pull the connector off of the sensor.

This is a lot more than "Preventive Maintenance". In my case, its better than a remanufactured transmission.

Now I can really enjoy my TL.
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Old 07-30-2009, 10:08 AM   #40
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Thanks for posting. I did this last night... very, very easy thanks to your pics. I ended up just jacking up the corner and removing the tire.

After I changed the switches, I took a test drive and immediately noticed a difference -- much more clean shifts. I can confirm too on my 1hr commute this morning (in traffic and on hills) that the shifting is much, much better. Cheers to whoever figured this one out.
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