Auto transmission problem on cold, fault code P1757 [SOLVED]

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eltaro

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Hi, i have a 2009 Malaysia 2.5 Auto Diesel D40 that stalls every time i used it after sitting more then an hour or so at the parking lot. Problem is much worse during the morning hours as i'm off to work.
Start and reverse and when i push the throttle at the Drive gear the car moves forward and few seconds later there would be a sudden jerk at the bottom of the car, almost as if it engages the 3rd or higher gear.(The jerking is not that hard compared to when for example changing to Drive from Reverse before making sure the care is stopped completely)
Then it would take an effort to get the car to speed.
Turning off the car and starting it back again(sometimes 2,3,4 times) would always solve the problem and there won't be any issues all day long accept if i were to park it for and hour or so.

Here what i have done so far;
1. SCV being the common problem leads me to get my mech to have it replaced but problem still the same.
2. Have my mech replace the fuel filter.
3. Checked and cleaned MAF sensor and brand new air filter.
4. New turbo Boost Control Solenoid.(Replaced it cause it was causing lots of noise vibrating into the cabin)
5. Checked and cleaned the fuel common rail pressure sensor.
6. Used the free OBD2 software and compared engine temperature/MAF flow/Turbo boost/common rail pressure/rpm/ during problem and during normal conditions. Comparison showed no difference what so ever leading me to believe its nothing to do with air/fuel system. My guest got stronger when i started to hit fault code P1757.

From my research it tells me
P1757 NISSAN Description Front brake solenoid valve is controlled by the
Transmission Control Module (TCM) in response to signals sent from the
PNP switch, vehicle speed sensor and accelerator pedal position sensor (throttle position sensor).
Gears will then be shifted to the optimum position.

Im hoping that this code could be solved by checking/cleaning/replacing
the 3 sensors mentioned. Trying to avoid opening/replacing the valve body/TCM ($$$$!).

Any suggestions and help would be greatly appreciated. Where do i find each of these sensors in the car anyways??
 
Welcome to the forum!

It's always good to try the cheaper solutions first.

The PNP switch detects the position of the gear selected by the lever. If yours is displaying the chosen gear correctly in the dash, then your PNP is likely to be good.

The "vehicle speed sensor" is probably the revolution sensor in the gearbox. 2009 D40s get the actual speed (for the ECU, not the TCM) from the ABS sensors on the wheels. While I've never heard of any problems with this sensor, it's possible for any sensor to fail. It is inside and sends a pulse signal based on the rotation of the idler gear parking pawl lock gear (on the output shaft at the rear of the gearbox).

The throttle position sensor is an easy one, and easily replaced if required, but a clean of it and its electrical connections should happen first.

The problem is likely to be in the valve body itself though. There are 3 solenoids in the valve body and the middle one is the one usually responsible for this error. Flushing the gearbox may not help, but checking for fluid contamination is very important.

Fluid contamination can be caused by water entering the gearbox (dipstick, or breather) or through the radiator - at the bottom of the radiator you'll find two hoses that head back to the gearbox. These hoses connect to a transmission cooler inside the radiator. Many people bypass that cooler and install an external one so that any radiator damage doesn't turn out to damage the transmission as well (I have done this mod on my own car too).
 
Thanks for your reply. Will have the transmission fluid check for contamination
Meanwhile will check if cleaning those 3 sensors does the trick...
But in the end do agree with you on that most probable cause...
Been seeing the youtube videos on a common connecting pin breaks or solenoid for p1757 code.. those guys actually solder it back. Wonder if my mech is willing to do that..unless its water or falty solenoid..
 
Update on my p1757 code. Had a transmission specialist check my vavle body
and walla! broken circuit in 2 places on my TCM board. Had it soldered and refilled now problem solved!! :) .
Apparently my solenoid were fine. Serviced and plugged back in.

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That's great news, thanks for getting back to us about it!

Very odd that the circuit on the TCM should break. Did they say what they think might have caused the circuit to break in the first place, like maybe a particular vibration that could have been avoided?
 
It did struck my mind but didnt really ask them why cause was too exited my TCM got fixed :)
But if i could guest due to my hard offroading and 3+inch lift. I had my car lifted and bushing replaced with cheap teflons last year and the suspension does feels like its dropping with a hard sound whenever i hit a hole or going up a bump.. my next available budget will definitely go to rebuilding my suspension with a more professional/experienced mech. (No offroading or fast bumper pass for the time being...)

Having said that, i do agree with you, how could it break? make me wonder if the circuit moves
whenever solenoid engages.. can figure out the "L" seciton of the circuit breaks but along the horizontal breakkk?? how? even if the TCM shakes hard during offroading, the horizontal circuit connection shouldnt snap..
 

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