pagerart Posted July 15, 2008 Report Share Posted July 15, 2008 It's been over three weeks since I got my new razors. I purchased new tire sensors on ebay and had them installed on the new wheels and tires. From that point everything seemed fine. Well today I took the car out and got a tire fault warning and it keeps coming back everytime I restart the car. I checked the air pressure and it shows around 35 in the rear and 30-32 in the front. Is there a way to know if it is a bad sensor, or do I just need to add more air? The warning isn't very descriptive. Link to comment Share on other sites More sharing options...
motorjock205 Posted July 15, 2008 Report Share Posted July 15, 2008 It's been over three weeks since I got my new razors. I purchased new tire sensors on ebay and had them installed on the new wheels and tires. From that point everything seemed fine. Well today I took the car out and got a tire fault warning and it keeps coming back everytime I restart the car. I checked the air pressure and it shows around 35 in the rear and 30-32 in the front. Is there a way to know if it is a bad sensor, or do I just need to add more air? The warning isn't very descriptive. You probably just need to have the sensors reset. I had a TPMS fault show up on my SGT after putting the GT500 wheels on as well and driving a few miles, so I went to Discount Tire and had them reset the sensors and the TPMS fault went away. Any tire store should be able to reset the sensors...if not, go to the dealer and they can do it too... Also, I would probably reverse your pressures in your tires and run 34-36 in the front and 28-30 in the rears as the rear of the car carries a lot less weight than the front of the car...I think you might find that the car actually handles a lot better with those as starting pressures. Link to comment Share on other sites More sharing options...
ColdwaterHotrod Posted July 15, 2008 Report Share Posted July 15, 2008 add more psi to the fronts & see if it goes off, this will tell you if you are on the edge/limit of the sensor for triggering the alarm. anthing below 32 & mine go off Link to comment Share on other sites More sharing options...
JeffIsHereToo Posted July 16, 2008 Report Share Posted July 16, 2008 It's been over three weeks since I got my new razors. I purchased new tire sensors on ebay and had them installed on the new wheels and tires. From that point everything seemed fine. Well today I took the car out and got a tire fault warning and it keeps coming back everytime I restart the car. I checked the air pressure and it shows around 35 in the rear and 30-32 in the front. Is there a way to know if it is a bad sensor, or do I just need to add more air? The warning isn't very descriptive. There is a complete TPS guide that was posted. I will look for it and post tonight maybe that will help too if you still have the issue. Link to comment Share on other sites More sharing options...
msouhlas Posted July 18, 2008 Report Share Posted July 18, 2008 It's been over three weeks since I got my new razors. I purchased new tire sensors on ebay and had them installed on the new wheels and tires. From that point everything seemed fine. Well today I took the car out and got a tire fault warning and it keeps coming back everytime I restart the car. I checked the air pressure and it shows around 35 in the rear and 30-32 in the front. Is there a way to know if it is a bad sensor, or do I just need to add more air? The warning isn't very descriptive. Assuming that you have the correct sensors, you probably need to "train" the new sensors to the car's computer. There is a $13 tool available from Ford that lets you do this. It is typically used on stock wheels when rotating them so that the computer knows which wheel is where... Link to comment Share on other sites More sharing options...
blueshawk Posted July 18, 2008 Report Share Posted July 18, 2008 Assuming that you have the correct sensors, you probably need to "train" the new sensors to the car's computer. There is a $13 tool available from Ford that lets you do this. It is typically used on stock wheels when rotating them so that the computer knows which wheel is where... I rotated my stock tires and did not need to retrain. The tool can't sense "direction". It only senses if the wheel is within the maximum distance. Many people who replace their wheels with aftermarket ones take all the wheel sensors, place them in a pressurized PVC tube with pipe caps one each end and a pressure fitting. Then throw the tube in the trunk and that satisfies the computer. Link to comment Share on other sites More sharing options...
SpeedRacer Posted July 18, 2008 Report Share Posted July 18, 2008 Here are the instructions to train the sensors: Stuart tpms_tool.pdf tpms_tool.pdf Link to comment Share on other sites More sharing options...
msouhlas Posted July 18, 2008 Report Share Posted July 18, 2008 I rotated my stock tires and did not need to retrain. The tool can't sense "direction". It only senses if the wheel is within the maximum distance. Many people who replace their wheels with aftermarket ones take all the wheel sensors, place them in a pressurized PVC tube with pipe caps one each end and a pressure fitting. Then throw the tube in the trunk and that satisfies the computer. The TPMS identifies the 4 wheels separately so that when there is a fault with one of the wheels, the dash indicator tells you which tire is low. This is why you should retrain the sensors after rotating the tires. It has nothing to do with the direction of rotation, but just the unique ID/address of the sensor. It prompts you to train the left rear, left front, right front them right rear in that order so that it associates each sensor with a particular wheel position... If you did not retrain, you won't get a system fault, but if one of your tires goes low, the dask will tell you that it's the wrong wheel. Hope that this clears things up... Link to comment Share on other sites More sharing options...
ColdwaterHotrod Posted July 18, 2008 Report Share Posted July 18, 2008 I think you guys need to go let some air out of your tires & read the message again. Mine doesn't tell me which tire it is, it will only illuminate a "low tire pressure" message when one or more of your tires is significantly under-inflated. It is not specific to which one (RF, LF, RR, LR), which allows tires to be rotated w/o reprogramming the TPMS each time. Check your owners manual (starting on pg 144) for more info on how the TPMS system works. I could be wrong & they are different for the SGT vs. the GT500, but I don't think they would make them specific to each corner. Link to comment Share on other sites More sharing options...
AstroDan Posted July 18, 2008 Report Share Posted July 18, 2008 add more psi to the fronts & see if it goes off, this will tell you if you are on the edge/limit of the sensor for triggering the alarm. anthing below 32 & mine go off Mine too. Even 31 Link to comment Share on other sites More sharing options...
LuLu Posted July 18, 2008 Report Share Posted July 18, 2008 It's been over three weeks since I got my new razors. I purchased new tire sensors on ebay and had them installed on the new wheels and tires. From that point everything seemed fine. Well today I took the car out and got a tire fault warning and it keeps coming back everytime I restart the car. I checked the air pressure and it shows around 35 in the rear and 30-32 in the front. Is there a way to know if it is a bad sensor, or do I just need to add more air? The warning isn't very descriptive. If you got the sensors off of ebay, one may have a dead battery. I suggest you fill all the tires to -5 PSI under what is stated on the sidewall as "max pressure" and see if it goes away. After balancing out the PSI, reset/clear the dash warning and go for a drive. 15 minutes or more, and over 20 MPH. If the code comes back, and it flashes before sticking on, that would indicate a problem with the sensor. Take it to a Ford Dealership, they have a radio based test tool that can verify sensor transmission to the Smart Junction Box (SJB) by holding it against the sidewall. I think you guys need to go let some air out of your tires & read the message again. Mine doesn't tell me which tire it is, it will only illuminate a "low tire pressure" message when one or more of your tires is significantly under-inflated. It is not specific to which one (RF, LF, RR, LR), which allows tires to be rotated w/o reprogramming the TPMS each time. Check your owners manual (starting on pg 144) for more info on how the TPMS system works. I could be wrong & they are different for the SGT vs. the GT500, but I don't think they would make them specific to each corner. Agreed. I pulled out my "big red books" and reviewed section 204-04-23 through 204-13-36. This is a lot of material, and I found nothing about identification of which tire is low. The sensors report PSI to the SJB and when one or more tires are significantly lower than others, the SJB will throw a code. 30 PSI in the front and 35 PSI in the rear may be enough of a spread for the SJB to report a low tire. The books are for the '07 Mustang GT and GT 500, The TPMS may have been updated in '08. When I tested my TPMS, the threshold for a code on my SGT tested out to 30 PSI or under. Link to comment Share on other sites More sharing options...
motorjock205 Posted July 19, 2008 Report Share Posted July 19, 2008 The TPMS identifies the 4 wheels separately so that when there is a fault with one of the wheels, the dash indicator tells you which tire is low. This is why you should retrain the sensors after rotating the tires. It has nothing to do with the direction of rotation, but just the unique ID/address of the sensor. It prompts you to train the left rear, left front, right front them right rear in that order so that it associates each sensor with a particular wheel position... If you did not retrain, you won't get a system fault, but if one of your tires goes low, the dask will tell you that it's the wrong wheel. Hope that this clears things up... The SGT does NOT indicate which tire is low...it merely throws the low pressure warning... When I installed my GT500 Wheels and Tires that I purchased from a GT500 owner, I got the TPMS FAULT after driving for about 30 miles or so, so I went to Discount Tire and had them reset the sensors to my car...No problem since, and I'm running 36 PSI in the fronts and 30 PSI in the rears, so I don't think the spread difference is a big thing either..perhaps I'm just lucky there, I don't know... Link to comment Share on other sites More sharing options...
pagerart Posted July 20, 2008 Author Report Share Posted July 20, 2008 Thanks for all the input. I ordered the reset tool online and will try it out next week. If that doesn't do the trick, I will get it checked out next time I am in for an oil change. Link to comment Share on other sites More sharing options...
blueshawk Posted July 21, 2008 Report Share Posted July 21, 2008 The TPMS identifies the 4 wheels separately so that when there is a fault with one of the wheels, the dash indicator tells you which tire is low. This is why you should retrain the sensors after rotating the tires. It has nothing to do with the direction of rotation, but just the unique ID/address of the sensor. It prompts you to train the left rear, left front, right front them right rear in that order so that it associates each sensor with a particular wheel position... If you did not retrain, you won't get a system fault, but if one of your tires goes low, the dask will tell you that it's the wrong wheel. Hope that this clears things up... From the Ford .pdf instructions for TPMS training: NOTE: The tire pressure monitoring system is not affected by wheel and tire rotation. Link to comment Share on other sites More sharing options...
IASHELBYGT Posted July 21, 2008 Report Share Posted July 21, 2008 Here is a good link to information about the TPMS. http://www.americanmuscle.com/understandin...stang-tpms.html Link to comment Share on other sites More sharing options...
kaiserkreb Posted July 24, 2008 Report Share Posted July 24, 2008 Thanks for all the input. I ordered the reset tool online and will try it out next week. If that doesn't do the trick, I will get it checked out next time I am in for an oil change. Just for the record, mine does the same thing and I ordered the tool, calibrated the sensors according to that pdf file and mine still throws a code. None of the tires are below 32 and the sensor indicates training is successful until you start the car, then bam, another fault message. I wonder if my SJB is buggered or something. I've noticed some weird issues with the windows forgetting their auto up/down calibration and whenever I start the car the CD changer started going through all of the cds again to see what was in the trays instead of remembering them as it always has before. Also, the odometer randomly switches back to imperial as opposed to my having set it on metric. Weird. Guess I should go for a drive and find a decent Ford dealer instead of my small local shops who never get to work on anything newer than 96. Link to comment Share on other sites More sharing options...
LuLu Posted July 24, 2008 Report Share Posted July 24, 2008 Just for the record, mine does the same thing and I ordered the tool, calibrated the sensors according to that pdf file and mine still throws a code. None of the tires are below 32 and the sensor indicates training is successful until you start the car, then bam, another fault message. I wonder if my SJB is buggered or something. I've noticed some weird issues with the windows forgetting their auto up/down calibration and whenever I start the car the CD changer started going through all of the cds again to see what was in the trays instead of remembering them as it always has before. Also, the odometer randomly switches back to imperial as opposed to my having set it on metric. Weird. Guess I should go for a drive and find a decent Ford dealer instead of my small local shops who never get to work on anything newer than 96. This sounds like an intermittent short that interrupts power to the PCM and once it's restored (key-on), all systems default to standard parameters. Get it checked out, you may end up with a dead car at a very inconveinent moment. Link to comment Share on other sites More sharing options...
kaiserkreb Posted July 24, 2008 Report Share Posted July 24, 2008 This sounds like an intermittent short that interrupts power to the PCM and once it's restored (key-on), all systems default to standard parameters. Get it checked out, you may end up with a dead car at a very inconveinent moment. Yeah it's really bizarre. I will definitely have to get it in ASAP. Crappy thing is I have to take it to a large dealer in the city an hour away so it's not exactly convenient. Oh well. C'est la vie. Link to comment Share on other sites More sharing options...
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