DPS6 Transmission

Jose Diagnostician Indiana Posted   Latest   Edited  
Resolved
Drivetrain
2012 Ford Focus SE 2.0L (2 Flex) 5-spd (MTX75)
P285C — Shift Fork "A" Actuator Circuit Performance
P2860 — Shift Fork "B" Actuator Circuit Performance
P2872 — Clutch "A" Stuck Engaged
P287A — Clutch "B" Stuck Engaged
No Transmission Engagement, Fails Shift Drum Learning

Came from a different shop, they replaced both Shift fork actuators. I spun both forks 13 times and they return fine. Tried doing the learn procedure for the transmission and it fails at shift drum adaptive learning. I'm suspecting a bad tranmission module since I'm getting circuit faults and wiring integrity is good from transmission to the actuators and all power and grounds are present at the TCM. Not familiar with the way this tranmission does a self test to detect these circuit faults so I'm hoping that someone can lead me to a direction to confirm the TCM is indeed unable to actuate these shift solenoids. I scoped both input shaft speed sensors and they are not moving when I start the car.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

You should be able to remove module and rotate the shift gears with a little help from a flat head. They should go in fairly easy and come out fairly easy. Make sure each shaft can go from stop to stop! There are two big wires feeding the module. These wires will power the shift motors. Clamp around both with one clamp. On the scope a good signal should kinda look like a outline of Norte Dame…

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Helpful
Interesting
Jose Diagnostician
Indiana
Jose
 

No sounds come from the actuators. The only thing I hear is the throttle plate cycling. I did also get P286F Disengagement time performance/ too slow. I have the two towers you speak of, I used a jumper to clamp at the fuse box 25A #15, I get around 13.1 and 10.3 for the second one. It varies and I get these when I start the car only. When I run the adaptation tests I dont see any amp draw…

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Jeffrey Mobile Technician
Illinois
Jeffrey
   

ok that seems like low current to me. I’ll have to look at my saved files. I have one where shift motor A is fine but B position was bad. Pretty sure I saw more than fuse current on A. Its really hard to catch it in data. I think I might have a small fragment of data current saved.

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Jose Diagnostician
Indiana
Jose
 

There are two feeds from this 25 amps that splice into the transmission and the other one is a 15 amp. I saw Bernie using this fuse as well to test for amp draw by these two actuators.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

Did Bernie state a known good current?

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Jose Diagnostician
Indiana
Jose
 

I dont recall that he did, he only explained what the actuators were trying to engage because in his case, one of the input speed sensors was detecting a spin which he said is not normal and that the clutches were bad in his case. The amp draw was crazy high though and had longer pulsations and repeatedly in his case.

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Jose Diagnostician
Indiana
Jose
   

Jeff, I have my peaks shown here and I believe it is too short (about 2.8ms from start to end); it only shows up when I start the car. I also noticed that these peaks are not consistent. Would love to see the waveform you have. Thank you for your help.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

Those do not look good at all. I’ll look today for them.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

I see a lot of negative current which doesn’t look good compared to my memory. But then my memory might not be good. Kinda looks like the motor tries and gives up then repeats.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

The first file is the psdata file. The second file is of motor B, TCM set a code for motor B due to the syncros being very worn and not being able to engage at all. Third file is of motor A which alwaays worked good and no codes. My current was a little off I guess. Yellow and green are both current. I had a amp clamp around each power feed wire into TCM. Red and blue are both voltages at power…

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

What range amp clamp are you using. To me it seems like there isn't enough current to even move the motors. I'd say put some voltage readings on there with a smaller time base. I'd say have your voltage readings right at the TCM so you can get the full effect of any voltage drops. clear all codes and cycle key to KOEO.

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Jose Diagnostician
Indiana
Jose
 

This is what I had been suspecting that the TCM is unable to control the motors at all. The spikes do not hold enough current to actuate the motors as they do not make any sound. I'm using the cc65 with 1mV = 100mA setting.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

Ok so they are able to pull 10 amps, so I think we might be looking at internal TCM issue. I’m kinda wondering about your time base and sampling on the pico. I personally always run a 5Ms or higher to start with. I’ll look up specks on the amp clamps frequency. The waveform just looks a bit choppy to me. Hopefully others can chime in on my opinion

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Jose Diagnostician
Indiana
Jose
 

I will pull the big dog from my pico 4425a and get a capture. I agree that it is a long sampling time since I felt that I may not be able to catch it but it was so small it looked like noise.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

It looks like the CC65 has the same specs as the pico I used. You could use the 20 amp pico setting built into the scope if desired.

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Jose Diagnostician
Indiana
Jose
 

I got the data from good known waveforms during start up from a 2015 Focus. This spike is just like you described, the waveforms that you have look different. The only time I got a different waveform was when I would switch the key off. First pic is ignition off waveform feedback and the 3 towers are when I start the car. What you have on the second picture capture is the ignition being switched…

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

Okay so the scope capture I have is from the initial key on event. The motors can be heard shifting through the gears. The car will not crank during this time. This is after clearing all codes. TCM is attempting to initialize the motors. Normal working trans will not initialize like this on key cycle. I could see the tail end in motor a current on the IDS. Very difficult to get IDS to read…

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

Side question. Is that a Rotkee MTlabs scope screen shot?

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Jose Diagnostician
Indiana
Jose
 

Yes, this is the Rotkee MT 4.1 Pro. Very nice inexpensive scope and has presets for Hantek accessories.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

I have one. Have used it much. I like the 6 into cable!

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Michael Owner/Technician
Texas
Michael
 

I can't get shift drum to pass with Autel. I think I had the same issue with IDS, but would have to try it again next week. I don't have any issue not passing it, I just skip that part. I'm still waiting on Ford to address the issue for P090C, but module is on back order and dealer won't take the vehicle because of backlog. Rentals are part of the warranty now if the module is at fault.

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Casey Mechanic
Indiana
Casey
 

Tcm known issues

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Agree
Jose Diagnostician
Indiana
Jose
 

The adaptation fails without that shift drum step. Also, in my case, the tranmission does not engage at all when shifting gears.

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Michael Owner/Technician
Texas
Michael
 

Learn shift position and try. PRNDL

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Jose Diagnostician
Indiana
Jose
 

Shift position is good and change accordingly.

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Matthew Owner/Technician
Oregon
Matthew
 

I fought 2 of these recently and never came out with a satisfactory result. I think this was mostly due to parts availability, but in my research I found there was a class action lawsuit and buyback of thousands of these cars. I would double check that this doesn't qualify for a TCM and probably a whole transmission warranty. Parts were on backorder from Ford last I checked. I never got any of…

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Jose Diagnostician
Indiana
Jose
 

It ended up being the tranmission module. The scope captures were indicating a poor feed to the motors which is supplied by the TCM itself. Before the module swap, I ended up opening up the original bad module and resoldering about 70% of the pressed on joints. The TCM passed the previously failed steps during the initial failure but never quite completed the other steps. There are some pins…

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Karl Owner/Technician
Pennsylvania
Karl
 

I just got done replacing a TCM on one of these. They are on back order. I waited 3 months for mine. The customer only had 29,000 miles on the one I did. It was setting internal control module fault codes. The problem is it was a reconstructed title so no warranty applies to it. But what I found interesting was with the new module Ford did not have any recommendations for the relearn procedure…

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Jose Diagnostician
Indiana
Jose Resolution
 

The issue was the TCM. Installed a used one, did all the relearn procedures and passed. The last phase to avoid the driving learn took a coupe of tries but it completed it as well with the scanner. I used the Verus Pro which works really well.

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