Automatic Transmission Will Not Upshift

[Neil Rebua]

Hello mga sir! I have a Nissan Exalta Grandeur 02 A/T. My problem is minsan hindi nagsshift from 1st gear to second gear yung transmission kahit inaabot na ng 4k yung RPM sa tachometer. Then minsan bigla naman siya magdown-shift then hindi na mag-upshift. Most of the time pati nangayayari siya kapag galing yung kotse sa matagal na pahinga (overnight na di nagamit). Then after I re-start the car, nawawala na ulit yung problem. I had it checked yesterday and hindi daw sliding yung tranny sabi nung mechanic. Ano pa kaya pwedeng maging cause nung problem sa tranny? Salamat!

[saksidriver]

Baka kailangan mo na magpalit ng transmission fluid.


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[Neil Rebua]

Baka kailangan mo na magpalit ng transmission fluid.

mga 3x na ako nagpapalit sir simula June, ganun pa din.

[non-vtec]

Have it scanned muna to isolate possible electrical problems. Anong fluid pala ginamit mo?


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[Neil Rebua]

Have it scanned muna to isolate possible electrical problems. Anong fluid pala ginamit mo?


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yung Castrol Transmax ata yun na Dexron III sir..

[mrjeff]

Transmission range o tcm


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[non-vtec]

Ilan na mileage? Last resort you should do is to try atf dialysis using Nissan Matic D fluid. Otherwise change to surplus na lang.


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[HULK8030]

mga boss gud pm, yung pajero po namin ayaw mag-overdrive kahit naka-on na ang overdrive button, 4m40 po engine 94 pajero JDM. dati pag-ilagay ko sa "snow" ay mag-upshift xa to overdrive kaso ngayon ayaw na talaga, stuck n ako sa 3rd gear, ang tranny b may problema nito or yung electronics/TCM?

[jick.cejoco]

before blaming the TCM or PCM, check the inputs first. remember in computer lingo GIGO? in the inputs are not within range, the output will be garbage. check if the MIL is on and/or the O/D light is flashing. the inputs to the transmission control includes but is not limited to : throttle sensor, engine coolant temperature sensor, vehicle speed sensor, the O/D request switch, transmission oil temperature sensor and some other malfunctioning systems of the powertrain or engine control that would place it under "limp" mode.

[HULK8030]

before blaming the TCM or PCM, check the inputs first. remember in computer lingo GIGO? in the inputs are not within range, the output will be garbage. check if the MIL is on and/or the O/D light is flashing. the inputs to the transmission control includes but is not limited to : throttle sensor, engine coolant temperature sensor, vehicle speed sensor, the O/D request switch, transmission oil temperature sensor and some other malfunctioning systems of the powertrain or engine control that would place it under "limp" mode.

AT temp lights does blink after a few kms, speedo not working anymore.

[t2erns]

AT temp lights does blink after a few kms, speedo not working anymore.

no vehicle speed signal (odo )=no trans shifting ; some transmissions use the trans output sensor, some have separate speed sensor, some use the abs wheel speed sensor. to sum it up you will need a scanner to diagnose the sensor.