Correcting speedo error
 

A GPS is as accurate at calculating your vehicle speed as is a 'certified'
speedo in a police car. So when the speedometer in my 2006 Liberty was
registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
next service interval. The mechanic came up with a relatively easy fix. He
re-programmed the computer to make it think I had different sized tires on the
car. He got it dead on. However, the odometer still registers less kilometers
than the GPS records. I have verified the GPS odometer with the markers along
the highway.

Can anyone confirm that electronically altering the speedometer reading would
not necessarily change the odometer as well?

Thanks

Re: Correcting speedo error
 

On Tue, 28 Aug 2007 10:18:15 -0400, budman@frozenorth.ca wrote:

>
>A GPS is as accurate at calculating your vehicle speed as is a 'certified'
>speedo in a police car. So when the speedometer in my 2006 Liberty was
>registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
>next service interval. The mechanic came up with a relatively easy fix. He
>re-programmed the computer to make it think I had different sized tires on the
>car. He got it dead on. However, the odometer still registers less kilometers
>than the GPS records. I have verified the GPS odometer with the markers along
>the highway.
>
>Can anyone confirm that electronically altering the speedometer reading would
>not necessarily change the odometer as well?
>
>Thanks


Strange, it should correct it too unless speedo gage itself is out of
cal (amount a signal to it need to show desire deflection) and if this
is the case correcting speedo reading via ECM would fix speed and
through odometer off. I suggest you take it back to dealer and have
them restore programing and pull speedo gage and have it checked for
calibration. I had this problem once on a GM truck and speedo itself
was bad.
-----------------
TheSnoMan.com

Re: Correcting speedo error
 

On Tue, 28 Aug 2007 10:18:15 -0400, budman@frozenorth.ca wrote:

>
>A GPS is as accurate at calculating your vehicle speed as is a 'certified'
>speedo in a police car. So when the speedometer in my 2006 Liberty was
>registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
>next service interval. The mechanic came up with a relatively easy fix. He
>re-programmed the computer to make it think I had different sized tires on the
>car. He got it dead on. However, the odometer still registers less kilometers
>than the GPS records. I have verified the GPS odometer with the markers along
>the highway.
>
>Can anyone confirm that electronically altering the speedometer reading would
>not necessarily change the odometer as well?
>
>Thanks


Strange, it should correct it too unless speedo gage itself is out of
cal (amount a signal to it need to show desire deflection) and if this
is the case correcting speedo reading via ECM would fix speed and
through odometer off. I suggest you take it back to dealer and have
them restore programing and pull speedo gage and have it checked for
calibration. I had this problem once on a GM truck and speedo itself
was bad.
-----------------
TheSnoMan.com

Re: Correcting speedo error
 

On Tue, 28 Aug 2007 10:18:15 -0400, budman@frozenorth.ca wrote:

>
>A GPS is as accurate at calculating your vehicle speed as is a 'certified'
>speedo in a police car. So when the speedometer in my 2006 Liberty was
>registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
>next service interval. The mechanic came up with a relatively easy fix. He
>re-programmed the computer to make it think I had different sized tires on the
>car. He got it dead on. However, the odometer still registers less kilometers
>than the GPS records. I have verified the GPS odometer with the markers along
>the highway.
>
>Can anyone confirm that electronically altering the speedometer reading would
>not necessarily change the odometer as well?
>
>Thanks


Strange, it should correct it too unless speedo gage itself is out of
cal (amount a signal to it need to show desire deflection) and if this
is the case correcting speedo reading via ECM would fix speed and
through odometer off. I suggest you take it back to dealer and have
them restore programing and pull speedo gage and have it checked for
calibration. I had this problem once on a GM truck and speedo itself
was bad.
-----------------
TheSnoMan.com

Re: Correcting speedo error
 

On Tue, 28 Aug 2007 10:18:15 -0400, budman@frozenorth.ca wrote:

>
>A GPS is as accurate at calculating your vehicle speed as is a 'certified'
>speedo in a police car. So when the speedometer in my 2006 Liberty was
>registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
>next service interval. The mechanic came up with a relatively easy fix. He
>re-programmed the computer to make it think I had different sized tires on the
>car. He got it dead on. However, the odometer still registers less kilometers
>than the GPS records. I have verified the GPS odometer with the markers along
>the highway.
>
>Can anyone confirm that electronically altering the speedometer reading would
>not necessarily change the odometer as well?
>
>Thanks


Strange, it should correct it too unless speedo gage itself is out of
cal (amount a signal to it need to show desire deflection) and if this
is the case correcting speedo reading via ECM would fix speed and
through odometer off. I suggest you take it back to dealer and have
them restore programing and pull speedo gage and have it checked for
calibration. I had this problem once on a GM truck and speedo itself
was bad.
-----------------
TheSnoMan.com