Join Date: Mar 2002
Location: Austin, TX, USA
Re: Who runs nitro in thier wheels??
I personally don't own a vehicle with air pressure sensors. However, I was just reading a popular mechanics article talking about the two different types and a relearn procedure.
The first type is called indirect TMPS and uses the ABS wheel speed to detect tire rotation speeds. Unfortunately, if your tires aren't worn evenly you can get false pressure detection issues and there isn't much you can do about it other than reset it from the driver controls panel or using a scan tool.
Some vehicles have battery operated pressure sensors called direct reading TMPS in the wheel that transmit the tire pressure to the ECM. These have a relearn procedure you can do that goes something like this...
1) Place the ignition in the ACC position
2) Simultaiously press the keyless entry transmitter's lock and unlock buttons until a horn chirp is heard. The system will be in the learn mode.
3) Start with the LF tire. Increase/decrease the tire pressure for 5 to 8 seconds, then wait for the horn to beep. (The article isn't clear if increase/decrease means increase AND decrease or increase OR decrease the pressure). The horn beep can happen before the 5 to 8 seconds has elapsed or up to 30 seconds after.
4) After the horn chirp has sounded repeat step 3 of the next three sensors in the following order: RF, RR, LR.
5) Once the relearn procedure is complete, the horn will chirp twice indicating that the relearn procedure is complete.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI