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2wd-4wd change failure

CGpatman

CGpatman

1️⃣ Getting Started...
Joined
Mar 9, 2021
Messages
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Location
Frazier Park, can.// Top of the*Grapevine*
2018 TRD OR DCSB Auto
Quicksand
I just replaced the front diff ADD unit 3rd one! the 1st 2 were Chinese knockoffs both crap. And the 3rd one is a genuine oem part after replacing the unit I tested 4 wheel drive system everything was great clear down to 4lo w/mts system function check. 30 minutes later I went to utilise 4 wheel drive system And received 2 wheel drive to 4 wheel drive change failure.. Here's my question what are troubleshooting steps to go from your transfer case to your front diff something I can do without a multimeter if possible and also code clearances for the issue how do I do so without a OBD metre unit.
 
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