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OT-4R100 transmission problem

M

mite-help

Member
Hello all--hoping for some help on my 2001 super duty trans. OD lite flashing, code po715-'turbine shaft input speed' scantool shows erratic movement til a few mph, than drops 0 speed. yeah, that's gotta be sensor, I thought--wrong. new one same thing. gears all seem to be there, just shifts different. Is there a reading I can take @ sensor connector-[now I think of that lol]is there anything internal that can be involved? I changed fluid shortly before this happened, it seemed to act funny in reverse, since it turned cold] fluid was fine, no smell, real pretty,so probly my cold diesel engine was prob. Thanks for any help-& yes, this is what I haul my tractors with, but hasn't seen any heavy pulling at all.
 
Was the sensor you replaced toward the front of the trans? These sensors are known to fail as you describe. They produce a low a/c voltage signal so you unplug sensor and measure A/C voltage across the pins (eng running). You can also measure resistance of the sensor too ( 781-1979 ohms). If your meter has the function to measure frequency/Hz, you can check that also. For A/C or Hz the readings should gradually increase as RPM increases (in P or N ), no glitches or drop-outs.

Sounds like you have a scan tool that monitors data? If so, you should be able to look at sensor data engine running in park or neutral. TSS sensor should match or be real close to the engine RPM at idle, or even holding a higher RPM.
 
From your description, it does sound like a sensor. However, there is also the possibility of a bad connector or a broken or shorted wire in between the PCM and the transmission.
This sensor reads the speed of the input side of the transmission. There is another sensor on the output side. The two sensors are compared by the PCM. That is how the PCM knows if the transmission is in the gear that it has commanded.
Since all of the gears are there, it would seem to eliminate the possibility of a mechanical failure. The component that corresponds to the sensor is a toothed wheel on a part that is directly connected to the input shaft (turbine shaft). If that were not turning, the transmission would not move the truck.
I suspect that your problem is either that you have replaced the wrong sensor or that there is a break in the wiring between the trans and the PCM. Recheck to see that you have replaced the correct sensor.
 
Thanks for the replies. I now have a little better understanding. yes, I replaced the front sensor, left side top of trans. the output speed sensor in rear shows smooth rpm. by not knowing exactly how it worked, I was thinking broken 'tone ring' like can happen on some diffs. the tss & oss sensors show to be the same part #-[ I did make sure new sensor was same length] I will check more tomorrow, I think scantool I was using will show more info than I was looking for, I just looked @ tss rpm. now that I got more info & the tone ring' thing out of my head, i'll ck some more--THANKS
 
It's starting to sound like a wiring/connection problem. I would start with the TSS connector, check the pins real good, make sure there is no corrosion or the pins are spread out. You can use the scanner to monitor TSS RPM and wiggle the connector and harness to see if you can get a bad result. Try to follow the harness back to the PCM the best you can, look for rubbing or pinching etc.
 
The 4R55E and 5R55E are noted for gasket failures. This trans is a completely different unit. It is the evolution of the old C6. First, it was extended and an overdrive was added, and called E4OD. Now, they went to a different set of designations. Still the same old E4OD with the bugs worked out of it.
 
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