[Mariowinax1]

Nissan Sentra 2008 Base 2.0L Petrol CVT
Hello folks, I need help
I replaced my tranny with a used one (CVT) everything is working fine but I have noticed hard shift from 1st gear to 2nd gear; btw I know CVT doesn't have a shift point like traditional automatic gearbox but its mimics it.
I feel my transmission lag to shift from 1st to 2nd.

Do I need to reprogram something ? Caliberation or mechanical stuff?
Can you direct me to monitor anything via OBD? TCM,ECM?

Please help

 

[amc49]

Shift lag and hard 'shifts' can be signs of a line pressure leak due to wear. A real good possibility that the replacement trans is bad too, not the first person to experience it, CVT being a common reason cars are junked.

 

[Mariowinax1]

Shift lag and hard 'shifts' can be signs of a line pressure leak due to wear. A real good possibility that the replacement trans is bad too, not the first person to experience it, CVT being a common reason cars are junked.

I doubt if its a bad transmission, I see so much improvement in this one than my old one I replaced.
More power, smooth shift (Except from 1st to 2nd), no trouble code, good fuel economy.

Might be just TCM software update or just a calibration reset, or software related.

 

[chidog]

With most of these electronic transmissions the ROM, that little electronic "black box" on the old transmission should be put on the new transmission, otherwise after a swap it may need to be initialized by the dealer, to work properly. Yes isn't electronics wonderful?