Tire sensor question
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Pro
Joined: Jan 2005
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From: APPOMATTOX VIRGINIA
Tire sensor question
Installed a different set of wheels which is causing incorrect pressure information on the display screen for 1 rear driver side wheel and 1 passenger side front. The pressure is correct when I check with my calibrated tire gauge. What's the solution?
Le Mans Master
Joined: Dec 2002
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From: Montreal Qc
Are you using the original sensors or did you install new wheels with different sensors? If they are the original sensors they are likely mounted on the wrong corner of the car, so you can either move them to their correct location which would involve demounting the tires to get to the sensors....or if that is not a good solution for you or they are indeed different sensors, then they must be re-trained with a special tool designed to do just that. The job of retraining them takes less than 2 minutes but you must either buy the tool or find someone who has one, the dealer or perhaps a tire shop. You might also find a member who has such a tool, I have one as I have two sets of wheels and must reset them whenever I swap wheels. 
FYI, I have seen a couple of these tools for sale in the parts section recently.
FYI, I have seen a couple of these tools for sale in the parts section recently.
Race Director
Joined: Jan 2005
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From: Daytona Beach FL
Originally Posted by tluck
Installed a different set of wheels which is causing incorrect pressure information on the display screen for 1 rear driver side wheel and 1 passenger side front. The pressure is correct when I check with my calibrated tire gauge. What's the solution?
Until we find out if you got new sensors or just had the old ones remounted in your new wheels, we're kinda conjecturing here.
Butt......I'd be willing to bet that your tire shop "registered" the sensors in the wrong order.
When you put the TPMS in the "learn" mode, you must "excite" the sensors in the correct order to "register" them with TPMS so the DIC will display properly.
You need to start at the Left Front, then do the RF, then RR, then lastly the LR.
When the sensors are registered, the TPMS and DIC interpret the first one to be registered to be the LF, the second the RF, and so on.
It sounds like your tire shop may have registered the LF first, so it displays properly. Then they may have gone around the car the wrong way, i.e., the second one they registered was the LR (and the DIC would display the second sensor registered as the pressure in the RF). The third one registered was the RR (which would be the third one either way they went around the car if they started at the LF) so it is displaying properly in the DIC. Then the fourth one they did was the RF, and the DIC interprets the last one to be registered as the LR.
So, if they did that, you'd have exactly the problem you're experiencing - the pressure in the RF tire would be displayed in the LR position on the DIC, and the LR would be displaying as the RF.
Take it back to the shop and tell them to re-register your sensors going around the car in the proper order.
Bob
Safety Car
Joined: Dec 2004
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From: stafford country, va. Avatar: Me on turn 3 @ Bristol (The World's Fastest Half-Mile)
Originally Posted by beezeye
......I'd be willing to bet that your tire shop "registered" the sensors in the wrong order.
When you put the TPMS in the "learn" mode, you must "excite" the sensors in the correct order to "register" them with TPMS so the DIC will display properly.
You need to start at the Left Front, then do the RF, then RR, then lastly the LR.
When the sensors are registered, the TPMS and DIC interpret the first one to be registered to be the LF, the second the RF, and so on.
It sounds like your tire shop may have registered the LF first, so it displays properly. Then they may have gone around the car the wrong way, i.e., the second one they registered was the LR (and the DIC would display the second sensor registered as the pressure in the RF). The third one registered was the RR (which would be the third one either way they went around the car if they started at the LF) so it is displaying properly in the DIC. Then the fourth one they did was the RF, and the DIC interprets the last one to be registered as the LR.
So, if they did that, you'd have exactly the problem you're experiencing - the pressure in the RF tire would be displayed in the LR position on the DIC, and the LR would be displaying as the RF.
When you put the TPMS in the "learn" mode, you must "excite" the sensors in the correct order to "register" them with TPMS so the DIC will display properly.
You need to start at the Left Front, then do the RF, then RR, then lastly the LR.
When the sensors are registered, the TPMS and DIC interpret the first one to be registered to be the LF, the second the RF, and so on.
It sounds like your tire shop may have registered the LF first, so it displays properly. Then they may have gone around the car the wrong way, i.e., the second one they registered was the LR (and the DIC would display the second sensor registered as the pressure in the RF). The third one registered was the RR (which would be the third one either way they went around the car if they started at the LF) so it is displaying properly in the DIC. Then the fourth one they did was the RF, and the DIC interprets the last one to be registered as the LR.
So, if they did that, you'd have exactly the problem you're experiencing - the pressure in the RF tire would be displayed in the LR position on the DIC, and the LR would be displaying as the RF.
would the 'suspension' be effected due to an incorrect pressure location.
does the msrc use 'tire pressure' as one of it's inputs ?
Race Director
Joined: Jan 2005
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From: Daytona Beach FL
Originally Posted by Zig
how would you suspect this to impact an msrc equipped car ?
would the 'suspension' be effected due to an incorrect pressure location.
does the msrc use 'tire pressure' as one of it's inputs ?
would the 'suspension' be effected due to an incorrect pressure location.
does the msrc use 'tire pressure' as one of it's inputs ?
I don't think the tire pressure is one of the measured parameters - amount of suspension deflection, rates of shock movement, steering inputs, maybe even some TC, AH, ABS, and yaw/acceleration info are taken into account, but I doubt tire pressures are mixed in.
Bob
