HELP!!! 07 Cooper S: replaced my auto trans & it was shifting smooth then a couple of days later it won’t shift at all! No matter which gear I put it in it acts like it’s in neutral. I plugged my scanner in my solenoids are reading s1 & s2 “off”, all of my electronic pressure control valves are reading between 980-1000 except for the last one is only reading 200

 

did you check the shifter cable?

 

yes everything looks fine

 

can you check the ATF fluid while the car is running. there should be a a little bit of fluid coming out, otherwise, it might be low on ATF

 

I’ll check it out. The manual says I have to pull the filler plug out first then the drain plug then start the vehicle but the last time I did that ATF shot back out the filler plug hole...any suggestions?

 

it did that maybe because it was overfilled? try starting the car then opening the filler and drain plugs.

When I did mine after a filter replacement, I would fill it until it starts seeping from the drain plug. Then, I would start the car with the tube still in the filler hole and the drain plug removed. while the car is running, I would fill maybe another 2 qrts before it starts seeping again. after each qrt or half a qrt, I would go through the gears, 3 seconds each.

 

Whoa, no, don't open the filler to check the fluid level or as you found it'll spray out fluid.

I'm assuming you have the Aisin 6-speed auto. With the car level on jack stands and engine/transmission cold, start the engine and leave it in park. THEN open only the drain plug (if you open the drain plug with the engine off you'll lose fluid) and let it warm up at idle. No fluid should come out until the fluid temperature hits 35-45C (95-113F) at which point it should be a steady trickle. If fluid comes out before 95F it's overfilled: let it drain until the fluid is at 95-113F and then plug the transmission before you turn off the car. If fluid doesn't come out until over 113F it's underfilled and you need to add more.

Proper checking & filling of the transmission is doable but a bit tricky, so make sure to read up on all the nuances before you mess with this, or leave it to a pro. You definitely need a good way to measure the dripping fluid temperature like a high quality instant-read thermometer or a thermocouple.

 

I beg to differ.

This was my personal experience with not 1 or 2 transmission filter replacements but a handful.

I should also draw your attention that the fill plfilis the one in the back by the axle, not the one under the shifter safety switch by the thermostat.

 

Well the one under the thermostat is the one that'll spray fluid, so I'm gonna go out on a limb and guess that that's the one he opened. That's the fill plug referenced in most of the online guides and it's not a great option, so don't open that with the engine running.

I did the drain & fill from the bottom using an ATF pressure filler. Did not have to open either fill port and the fill level came out fine (referenced to the amount of fluid I removed). You can't clean the pan this way but it sure makes the job easier, and I'll take doing more frequent fluid changes over dropping the dang pan.

 

Not sure which guide you're looking at, but this is the one I use https://www.newtis.info/tisv2/a/en/r...ission/HfYkp5P

 

Ok so I let the temp reach 89f before I removed the drain plug & fluid started pouring out. I’m assuming it was overfilled? Any advice on what to do now?

 

You do definitely have the plastic standoff tube thingy in there above the drain plug, right? That needs to be in place to set the level. If that's there then, yes, sounds like it's overfilled.

If that's the case, follow the procedure I gave above. Start the car with it level & cooled down. Start it, shift through the gears briefly with your foot on the brake, put it back in park, and then with it idling remove the drain plug. Stick a digital instant-read thermometer in the fluid that comes out. When the fluid dribbling out hits 95F (but before it hits 113F) then reinsert the drain plug and it should be at the proper level and you're done.

Don't try this with a hot engine & transmission, it needs to be cool when you start. Also engine needs to be running when you remove the drain plug.

 

 

Well, I can't help you with that, I'm not familiar with what the parameters should be. I would guess if something is wrong with the valve body then it's possible the fluid level could be messed up, but I'm no expert on the Aisin transmission, I just have some experience changing the fluid on it.

You said you replaced the transmission: was this a rebuilt unit? Did it come with any warranty? How did you set the initial fill level, or did it come pre-filled?

 

Bump.