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TomT
Posts: 10640
Joined: Sun Aug 08, 2010 12:09 pm
Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: California, now Georgia
Contact: Website

Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 2:59 pm

All vehicles these days are required to have a tire pressure monitoring system (thank you, Ford Exploder)...

They basically fall in to two camps:

There is the cheap and limited version that simply uses the ABS wheel speed sensors to compare the rotational speed of the four tires. When a tire drops pressure, it's speed will increase and this can be used to detect a low tire. The main problem with this system is that it won't detect if all tires are equally low. It can also be fooled if you put new tires on only one axle.

The much better but more expensive system actually uses tire pressure sensors in each tire to wirelessly send the actual tire pressure to a monitor in the car.

Does anyone know which version the Leaf uses? Based on the fact that I did not see a tire pressure readout anywhere in the data screens for the instrumentation in the car, I'm forced to conclude that they took the cheap route...
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
2019 Model 3; LR, RWD, FSD, 19" Sport Wheels, silver/black; built 3/17/19, delivered 3/29/19.

Train
Posts: 405
Joined: Mon Dec 13, 2010 11:08 pm

Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 3:11 pm

Nissan uses sensors mounted on the wheel on their other models so I would presume they use the same on the Leaf.

Smidge204
Posts: 940
Joined: Wed Nov 24, 2010 1:42 pm

Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 3:14 pm

The owner's manual mentions that using the tire repair kit will damage the tire pressure sensors, so that seems to corroborate Train's point.

Considering all the other bells and whistles they put on the thing it would seem odd to skimp on that detail.
=Smidge=

smkettner
Posts: 7355
Joined: Mon Aug 09, 2010 10:13 pm
Delivery Date: 26 Feb 2014
Location: Orange County, CA

Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 3:19 pm

What car uses the ABS?
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV
RAV4 traded in for I-Pace Dec 2018

User avatar
TomT
Posts: 10640
Joined: Sun Aug 08, 2010 12:09 pm
Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: California, now Georgia
Contact: Website

Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 4:04 pm

It's too bad that they went to all of the trouble and expense to install a system that can give you actual pressures for each tire, and then screwed it all up by not giving us a way to access that info... Not giving a warning until the tire is down to 30 pounds (6 pounds below factory recommenced pressure) is not really acceptable...

Smidge204 wrote:The owner's manual mentions that using the tire repair kit will damage the tire pressure sensors, so that seems to corroborate Train's point.

Considering all the other bells and whistles they put on the thing it would seem odd to skimp on that detail.
=Smidge=
Last edited by TomT on Thu Jun 23, 2011 1:24 pm, edited 1 time in total.
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
2019 Model 3; LR, RWD, FSD, 19" Sport Wheels, silver/black; built 3/17/19, delivered 3/29/19.

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LakeLeaf
Posts: 1424
Joined: Mon Jun 07, 2010 4:15 pm
Delivery Date: 04 Aug 2018
Location: South Lake Tahoe, California

Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 5:06 pm

Smidge204 wrote:The owner's manual mentions that using the tire repair kit will damage the tire pressure sensors, so that seems to corroborate Train's point.

Considering all the other bells and whistles they put on the thing it would seem odd to skimp on that detail.
=Smidge=



If fixing a tire will ruin a sensor - and most sensors I know of cost $100+ - not sure why one would even bother to try to fix the tire. I'd likely just call the tow company to come bring me in, or do a real fix to the tire on the spot. After all - the tow company is free for three years, isn't it? Most of the fix a flat stuff doesn't really "fix" the tire, just slows the leak for a while, so it's not a permanent solution, just a temporary one.

And if the used the expensive wheel sensor - you're out even more money.

GroundLoop
Posts: 1725
Joined: Mon Sep 13, 2010 9:31 pm

Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 5:09 pm

The spray goo is a last-ditch effort, I would think.

I'd certainly try the glue-on-a-rubber-rope plug kit first, or an expanding mushroom (Plug-N-Go).

The PSI data from the tire sensors is generally available on the CANBus if you know where to look.

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LakeLeaf
Posts: 1424
Joined: Mon Jun 07, 2010 4:15 pm
Delivery Date: 04 Aug 2018
Location: South Lake Tahoe, California

Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 5:21 pm

Yes, if a repair is going to cost you a sensor, it looks like it would be smart to purchase a real patch kit and try that first.

AndyH
Posts: 6388
Joined: Fri Apr 23, 2010 3:43 pm
Location: San Antonio

Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 6:30 pm

Service manual to the rescue. :D
The tire pressure sensor integrated with a valve is installed on a wheel, and transmits a detected air pressure signal by radio wave.

mynameisjim
Posts: 140
Joined: Fri Oct 08, 2010 2:12 pm
Delivery Date: 17 Jul 2012
Leaf Number: 23226
Location: Minneapolis, MN

Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 6:46 pm

I think the sensors cost around $20 and are supposed to be replaced every time the tire comes off of the rim

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