wildephoenix

Hello all,

I recently got the TPMS check system light. Also, the System function error.

What are the steps to reset?? I can't find this "elusive" button under the steering wheel :-)

Thank you.

Tyrone503

Check tire pressure first by scrolling through the MID, Could be either low tire pressure or tpms battery is out. Message won't completely go away until issue is resolved.

wildephoenix

What's MID? You mean on the console where I see the error? Thanks

Tyrone503

Yes, Exactly.

wildephoenix

Well, I didn't take a pic of that but all 4 readings are just a line (no numbers). Like it can't detect pressure from ANY tire. Thanks

NBP04TL4ME

MID = Multi Information Display

If is isn't showing tire pressure for any tire there is likely an issue with the TPMS central system vs. the actual sensors themselves as it is unlikely that all four would go bad at the same time.

Robbym

One of the batteries in the sensors died. The only way to fix it is replacing the TMPS sensor which requires removing the tire.

Mizouse

Yup. Likely one of the sensors battery is low. if one sensor goes out, the whole system goes out showing “- -“ as the reading.

Mine is currently intermittently telling me my TPMS system has an error. Mostly on colder days it doesn’t work.

if you can access the pressure readings as soon as you start the car, you MAY be able to see which sensor isn’t working in that it will show a 58 PSI reading.
for me it’s the front drivers side.

NBP04TL4ME

Really?? I have two set of tires and rims with TPMS and have yet to have a sensor battery die, so I don't have any direct experience. Seem kind of silly to have the whole system go down just because a portion of it is down. Wonder what the logic behind that is???

Mizouse

Yea depends on how old the sensors are and the environment your car is in.

if I recall the batteries last around 14 years. Mines an 07 and never had the sensors replaced. So it was about time.

The TPMS sensors in the wheel use one of those like coin watch batteries.
You could maybe open up the sensor and solder on a new battery but that’s too much work.

and yes, I don’t understand the logic either on having the whole system go out for 1 sensor.

wildephoenix

That's exactly what it's showing, nothing but a LINE for each

NBP04TL4ME

As Mizouse mentioned, perhaps it really is only one sensor..................

wildephoenix

Thanks all for the info/replies

Yea, this is exactly like mine....the front right driver side. You're right, it seems to be right when the car starts, I can see if briefly.

So, if I removed the tire, what's all involved to replace? Taking to shop is probably a rape I would guess

WDPanda

The 2006 year TPMS is hands down the best system I have seen. It resets upon start up and does not need cycling to reset. I was mad when I noticed low batteries on my 2008 would be much harder to pin point if you weren't ontop of the pressures to begin with and monitor vs just restarting the vehicle to gain access to the MID readings.

skillman11

I have the same issue. The sensors were all replaced 2 years ago when some kept dropping out showing 58PSI, or some other abnormal reading.

SilverSVT

Any input on what sensor to use for replacement? My Acura Service advisor recommended Continental "off the record" and I can find them @ Rock Auto for ~$27 each. OEM Acura Parts is $48 each but on backorder for the OEM units.

He also said at 170K I might as well do all 4, but I am pretty sure it is my right rear that is DOA.

Mizouse

I recall seeing these were recommended for aftermarket sensors and it does match the part number.
But you might want to search around Azine to make sure.

Part number: 06421-S3V-A04

i haven’t changed mine yet because now that the weather is warm the sensor hasn’t gone off anymore and I’m going to wait for new tires.

MORESENSOR Compact PRO Series 315MHz Preprogrammed TPMS Tire Pressure Sensor 4-Pack | Clamp-in | Compatible with Select 30+ Japanese Brand Models 06421-S3V-A04 | KX-S015-4 https://a.co/d/bsEeZZf

SilverSVT

Lol, today was the first day under 70, and mine started working again.

Of course I already ordered a new set from rockauto.....

Chad05TL

It reads 58 when it cannot talk to the sensor.
I just bought these sensors and removed 1 tire and just put the sensor in the wheel well, and it did not work. It was just Free air. no pressure. Just testing before I mount tires on new wheels.
So, I disconnected my battery to give it a jolt... Still nothing!!
Now I am nervous about installing these sensors because I do not know if they will work.
I did install OEM TPMS on my 2005 and it works fine. These new sensors are for an extra Set of rims.
So I bought OEM sensors a long time ago when I did the upgrade but I think I did not do anything special to get them to sync.
but for some reason these are not syncing in 5 minutes. I turned the key on and off a few times. But again, its just free air, no pressure, and it reads 58 lbs on my screen.
I don't know if you can see this picture.
https://drive.google.com/file/d/10RX...ew?usp=sharing

Mizouse

If I remember right you have to drive around a few miles for them to reprogram and it should change from 58 to the actual pressure.

Also I think they would give an error or improper reading if you put the sensor by itself in the wheel well since there’s no pressure to read.

but yea I understand your concern with them not working right after installation.

Chad05TL

Ya I was wondering if I would get and error or "Zero" pressure.. But I figure anything would tell me if it was going to work..
But I know atmosphereic pressure has something too..
In Dallas today the barometric pressure is 1017 hPa
According to google
1 hPa = 100 pascals (Pa)
1 psi = 6894.76 pascals (Pa)
So 1017 hPa = 101,700 Pa
101,700 Pa / 6894.76 = 14.75 PSI

So based on the math, I would think that the sensor should read 14.7 PSI in free air...
But this is only theoretical and not real world.
And My math s correct because Google defines atmosphere pressure as:
Definitions
Definitions from Oxford Languages ·
at·mos·pher·ic pres·sure
/ˈˌatməˈsfirik ˈpreSHər/
noun

1. the pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals (roughly 14.6959 pounds per square inch) (At sea level)

peter6

If I remember correctly from my school days, absolute pressure = atmospheric pressure + gauge pressure.
Basically, those sensors measure difference between atmospheric (outside the tire) vs inside of the tire.

We don't care about how much air exactly is inside the tire, but we care about the difference of inside vs atmosphere (outside), as that difference "pushes" on the tire.

For example, if on sea level you inflate tire to 30 psi with standard gauge, and take that tire high in the mountains, now pressure reading with the same gauge will be higher.
Amount of air inside the tire didn't change and absolute pressure didn't change, but because ambient went lower (because of change in elevation) now difference between in and out is higher and bigger force is created.

For another example, let's inflate tire to 30 psi and then put it inside the chamber also pressurized to 30 psi. Tire would appear flat. Measuring with standard gauge inside the chamber would yield 0 psi, but if you would somehow get that gauge outside the chamber and measure inside of the tire, it would say 30 psi, despite tire looking flat.

Chad05TL

I don't think the sensors I have measure the outside air pressure..
Atmospheric pressure is fairly constant at 14.7 psi.. It would be insignificant to measure outside air pressure..
I have three other tire pressure gauges and none of them compare outside air pressure..

peter6

They all do in one way or another, or they would show 14.7psi as soon as you turn them on.
And they would need to have perfect vacuum on one side of chamber used to measure pressure. (or pressurized to some known fixed pressure)

Simple mechanical are probably a spring loaded piston that is pushed further the higher pressure there is. It compares tire pressure to the ambient air pressure because that's what is between membrane / piston / seals.
On one side of the piston you have tire's pressure, on other side ambient air.

Electronic tire gauges have some kind of pressure transducer. There are different types but usually they work by measuring deformation of some kind of membrane. I don't know if one side is sealed chamber pressurized to some fixed pressure and then microcontroller is calibrated, or is that chamber simply open to the ambient air, but taking into consideration pressure variation with temp I would assume one side of the chamber is open to ambient air, so once again we compare atmosphere to whatever you're measuring (tire).

I'm not sure how it's done in TPMS sensors as there's no easy way to set part of the sensor on the outside of the tire, so I'll bet there's a chamber inside and sensor is calibrated at atmospheric level to read 0. With measuring temp and some calibration it can fairly accurately deduce what's the pressure.
If somebody knows how TPMS sensors actually measure the pressure please chime in.

And measuring air pressure relatively to atmosphere kinda makes sense. I mean imagine your tire is completely flat, you connect your air compressor, and gauge shows 14.7psi. Kinda doesn't make sense right?

Anyways, sensors must compare one reading to another. One side is what you're measuring, other might be sealed vacuum, some kind of sealed special gas, or simply open to atmosphere. And making it open is simplest and makes the most sense.

Chad05TL

Over thinking it... outside vs. inside pressure?