Couple questions about the TPS:

1. How do the TPS sensors work? Are they calibrated for the stock wheel pressures (ie. OEM 18" or 19" around 30-35psi)?

2. Or does it not matter what pressure they are at and that they will alarm when a drop in pressure is detected? If so, what drop in pressure will cause them to alarm?

Reason why I'm asking is the 20"s I'm running are at 38psi and 40psi for the front and rear, respectively. If the pressure drops to 30-35psi then that's normal for 18", 19" but low for 20"s running the risk of damaging the side walls.

Thanks,

Rich

 

TPS is set to go off at 28PSI

 

The TPM transmitters on the wheels transmit to the BCM through the keyless remote entry receiver and they are set for a specific minimum pressure, not a pressure drop. A Consult-II is used to set the warning pressures in the BCM for each wheel. Yours are set for whatever OEM wheel and tire combination you had.
I'm pretty sure the system can be set for any minimum pressure you want, and each wheel can be set individually if you run higher pressures in the rear. The service manual seems to recommend setting the warning at 5psi below the correct cold pressure for your tires.
I would check with a dealer.

 

Usual-suspect or anyone, would you happen to know how to raise the TPS alarm pressure?

If the 20" tires hit 28psi, it's too late already I think.

So basically the TPS is useless if you just transfer it from the stocks to 20"s or am I wrong?.

I mean yes, it will tell you that you have a flat, but so will the hundreds of vehicles passing you by on the side of the freeway when you have the flat.

Chime in anyone w/ 20" + TPS.

 

As I was saying, I know a Nissan/Infiniti tech can activate/deactivate them and set them for any OEM wheel/tire combo with a Consult-II. I'm willing to bet that they can set them for any required minimum pressure for your 20's.

 

+1

good explanation.. have it checked out at the dealer.. they can reset and set a lot of things for our cars..