95 Altima GXE Speedometer Calibration

rboccio · #1 (**permalink**) 03-13-2008, 07:11 PM

Hey,
Does anyone know how to calibrate and reset the speedometer? I put new tires and an alignment on the car last monday, and the speedometer is now 3 mph off at 55mph. I have a radar gun to verify this and I went to the repair shop today and they said that the speedometer cannot be calibrated. The ECU does have 3 codes, Speed Sensor A, O2 Sensor, and EGR Flow. Would any of these codes have to do with the speedometer being off by this much.

Thanks,
Ronald

Special7 · #2 (**permalink**) 03-13-2008, 07:26 PM

What size tires did you put on?

rboccio · #3 (**permalink**) 03-13-2008, 07:36 PM

Quote:

Originally Posted by Special7

What size tires did you put on?

Goodyear Viva2 205/60/R15 or it might be 205/65/R15 Not sure on the 60/65 part.....

I replaced all 4 tires then got the alignment with the new tires.

Ronald

bkal · #4 (**permalink**) 03-13-2008, 07:38 PM

well, the 60/65 part makes a difference. The speed sensor feeds the speedo, so that could be at fault.

rboccio · #5 (**permalink**) 03-13-2008, 08:00 PM

I just checked, it is 205/65/r15...

jserrano · #6 (**permalink**) 03-14-2008, 04:12 PM

Reset the ECU and see which codes come back.

rboccio · #7 (**permalink**) 03-17-2008, 04:35 AM

Well, I found that that the recommended Tires are 205/60R15 and since I have 205/65/R15, the 5 difference will cause my speedometer to be undereporting by ~3.2 MPH which according to my radar gun, it is correct. When my speedometer says 60MPH, I am going 63MPH. I didnt know that the little difference would make the speedometer off by 3MPH.

runcoolisback · #8 (**permalink**) 03-17-2008, 09:43 AM

Well, there is a way that you can get a fixed speed. But it would be digital and would require some sort of cable hooked up. I've researched this greatly but just haven't had time to complete my project. What some of the people working on this project, they are ripping everyone off. Charging 80+ bucks for A SIMPLE cable. then ripping us off on software that doesn't work anyway. But some of the software that can be used be setup to show on a palm device and blahblahblah. you get the point. **I need to goto bed.

haven't been there yet.

**

rboccio · #9 (**permalink**) 03-17-2008, 01:53 PM

I am not really worried about it. I just waned to know if there was an easy way to recalibrate the speedometer for the 3 MPH difference. I know the speed is reported from the computer and even if I get a ScanGuage it will still show 60 when I am really doing 63. I do appreciate all of the help though.

Thanks
Ronald

Pulski · #10 (**permalink**) 03-18-2008, 02:22 PM

Not easy. Just buy the right tires next time.

rboccio · #11 (**permalink**) 03-18-2008, 03:52 PM

Quote:

Originally Posted by Pulski

Not easy. Just buy the right tires next time.

I got the tires at walmart and 205/65r15 is what te computer said i needed on the car. If I had known to get the 205/60r15, i would have.

Ronald

magicalox · #12 (**permalink**) 03-18-2008, 07:54 PM

just take it back to wal-mart, telling them they made the mistake and that you actually need 205/60/15 should be fine within 30 days or so. if anything show your car's manual guide

rboccio · #13 (**permalink**) 03-18-2008, 10:40 PM

Quote:

Originally Posted by magicalox

just take it back to wal-mart, telling them they made the mistake and that you actually need 205/60/15 should be fine within 30 days or so. if anything show your car's manual guide

10-4. Will call them tonight when I get home and see if they will be willing to change the tires. I have only had them for 2 weeks today. Hopefully they will.

Thanks,
Ronald

Pulski · #14 (**permalink**) 03-19-2008, 04:34 AM

Quote:

Originally Posted by rboccio

I got the tires at walmart and 205/65r15 is what te computer said i needed on the car. If I had known to get the 205/60r15, i would have.

Ronald

Wasn't faulting you, just offering advice for next time.

215/45-17 isn't exact for either my car or the Altima, but I've had them on both. No biggie.