TPMS questions

[92whiteZ]

After changing the fluids, putting on new gs calipers, pads, rotors, bleeding the system, replacing 3 of the amps and clay bar/ 2 coats of wax I finally took my z out for its maiden voyage. Put on about 70 miles. Damn these things run!

About half way through the "service tpms" light came on. I set all the pressures at 36 psi before I went out. And I had driven the car for about 10 miles before I did alk the work so to see it come on is a little surprising.

My car has shelbys on it. I do not know if the previous owner removed and reinstalled the sensors. My guess is they didn't as I have the original rims with the factory GS-Cs on them.

Does the system create an error if it doesn't detect the sensors? I have a Genisys scan tool and tried to read the codes but it couldn't detect there was a problem. Dont have access to a Tech 1 and I will try to ground the aldl port. But until then am I correct thinking the system doesn't like the sensors to be missing?

Any thing I can do to turn it off easily but restore it later?

Lastly will the 17" sensors fit an 18" rim?

Thx

[Franke]

The receiver under the instrument panel looks for a signal from each wheel and if it doesn't receive any one of them it will light the TPMS light after a complete cycle. I am pretty sure it doesn't set a code. Just the light coming on is for driver info that something is amiss with the system. If you have a FSM look in Section 3E - wheels and tires.

[92whiteZ]

I do have the service manual. Its says a code 99 will set if the module doesn't receive any will sensor signals for 3 consecutive 30 minute periods with thr ignition in the "on" position.

My guess is that's what it is. Just curious if everyone running wheels without sensors deals with this. May disconnect the negative battery terminal to reset and see if it pops up again.

If anyone has a loose wheel sensor I would love to know if there is enough adjustability in the band to fit 18" wheels.

Thx