manwithgun
Unknown member
I haven't used a ScanGauge but have stumbled across some discussions regarding Trans temps and monitoring. One thing to keep in mind is that the trans fluid is cooled by the coolant radiator (the trans lines run through it) so their temps should align if everything is working as it should. Also, actual trans temps are not broadcast while in Park or Neutral, only while in gear.It works well, except for the Transmission Fluid Temp. My Sprinter is a 2008 3500 Winnebago RV, and these things are hard on transmissions. I thought the information would be good to know, so I can slow down, downshift, etc., to keep the trans temp below 200 degrees.
These links are referencing the T1N but I believe the NCV3 functions the same:
https://sprinter-source.com/forum/showpost.php?p=782852&postcount=55
"The transmission temperature is only broadcast over the CAN when the transmission is in either Drive or Reverse. When in Neutral or Park the signal is locked at 5 V to signify Neutral. So you may only be able to find the PID when in D or R.
From this old thread... https://sprinter-source.com/forum/sh...ad.php?t=47396
Keith."
https://sprinter-source.com/forum/showpost.php?p=810672&postcount=9
"A class C Sprinter motor home is a completely different animal than what you have. I often need to be in 3rd when ascending hills on the interstate. I'll lug up in 4th, but when rpm drops too low it's time to downshift again.
Lugging doesn't adversely affect tranny temperature. I don't believe downshifting, in order to keep tranny temperature low does much good. Tranny temperature is well regulated by the stock cooler/radiator. Coolant temp and tranny temp are closely coupled. They are almost always less than 15 F apart.
Here's a plot from this spring. Just past the 120 minute mark there's a longer duration with 100% LOD (red plot). Oil temp (upper plot) peaks at 273 F. Next two plots are coolant (purple) and tranny (green) temps. Coolant peaks at 221 F, and tranny temp peaks at 213 F. The viscus fan was holding temperatures in check."