nissan titan tranny HELP

Covering the 2003-2015 first-gen and 2016+ Titan and Titan XD lineup
mudhole
Posts: 2
Joined: Thu Jul 05, 2018 5:23 pm
Car: Nissan titan

nissan titan tranny HELP

Postby mudhole » Thu Jul 05, 2018 5:32 pm

long story, over the last 1.5 years i would occassionally get a p1774 code (low coast brake solenoid), it would cause it to go into limp mode, if i turned it off and on, it would run fine...it went away for about 1 year then came back and did it more frequently.

i decided to take out the valve body/tcm and repair it, i replaced all the shift solenoids (the low coast brake solenoid was bad and wouldnt "click" when energized by car battery, I also took the tcm apart and checked for any breaks in continuity from the shift solenoid pins, all seemed to be in good order.

i put everything back together and now it wont ever leave limp mode, i cannot shift manually and it is throwing p1772 code.

people i bought the shift solenoids from say the transmission must be flashed...this doesnt seem correct since i didnt change the valve body or tcm, just the shift solenoids.


mudhole
Posts: 2
Joined: Thu Jul 05, 2018 5:23 pm
Car: Nissan titan

Re: nissan titan tranny HELP

Postby mudhole » Tue Jul 10, 2018 8:38 pm

so i took the valve body back out, i dissassebled the tcm, and i found that the low coast brake solenoid wiring seems to lose continuity at the positive block... all the others have continuity with a certain amount of resistance...

amc49
Posts: 1158
Joined: Mon Jun 19, 2017 7:24 pm
Car: '11 Versa
'17 Altima

Re: nissan titan tranny HELP

Postby amc49 » Sat Aug 04, 2018 3:53 pm

Many TCMs have memory that decays when power is lost. As well, being a solid state part in places means that simple use of a voltmeter can provide enough voltage to blow one out.


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