Will a bad speedometer affect trans shifting this is a HUD cluster in 1993 Altima

ELLISONE

MEMBER
1993 NISSAN ALTIMA
165,000 MILES

Have replaced VSS, Revolution sensor, tps, did tune up, and replaced fuel filter. Also replaced bad injector. Checked all wiring from sensors to dash all were ok. The car runs great. But the speedometer is showing 40 mph while standing still and car warm when this happens I have shifting problems. When car is cold and the hud view is out and speedometer needle reads zero the car runs fine and shifts correctly. Now does this sound like the cluster needs to be replaced to correct the shift problem the book I have does not show or state if the ECM receives the speed signal after going to the control mod on the cluster first. If so would this cause shift problem since computer is receiving the wrong data under certain conditions.

Thank You

2 Replies

PROAUTOTECH

MECHANIC
288 POSTS

Your car should not rely on information it is displaying to you, like a tach or speedo. They are secondary. The car should already know the data it is displaying to you. But, a bad speed sensor, which tells your speedometer how fast you are going, and also communicates with your tranny would cause this. Check the speed sensor.

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Saturday, January 7th, 2012 AT 5:43 AM

ELLISONE

MEMBER
32 POSTS

The VSS sensor has been replaced with new one which I pulled again and tested good there is also a Revolution sensor on tail end of tranny witch I did not replace with a new one yet. All info I have read points to speedometer being bad. When the speedometer is out the loop and showing no reading at all the car runs fine as soon as the speedo and hud start working car will start shifting funny. Been at this for months and this is something I have noticed every time. Also ran test and watched flashes on OD lite and it will come on when key turned to on position and then it will flash 16 times and then stop. As to VSS sensor have replaced it twice and have made sure it is correctly seated in tranny

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Saturday, January 7th, 2012 AT 5:30 PM