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Re: Tire Registration

Posted: Tue Oct 10, 2017 6:36 pm
by derkraut
Powersurge said: "All this computer and phone app crap is turning us into a society of obsessive compulsive pussy willows that have to get their data just the way they like it or they have an embolism. They are probably the same ones that get their meal ingredients ordered by mail so they don't have to cut their own vegetables... As proof, there is even a guy that posted he is going to harrass the shop about it."

I couldn't have said it better myself. Seems like we're getting to the point where we expect someone to wipe our butt when we're done with business. Technology is wonderful, but I think it has its limits, if you want to enjoy life. :roll:

Re: Tire Registration

Posted: Wed Oct 11, 2017 10:38 am
by jlv
powersurge wrote:The TPMS goes on when ONE of them goes below a certain point. That ALERTS YOU that a tire is below pressure, and you should check ALL of them.
That is just because Nissan implemented a dummy-light on the dashboard. The car knows which of 4 sensors is reporting the low pressure -- in fact, the car knows what the exact tire pressures are. The car just doesn't tell you that because someone decided it's sufficient to just provide a the equivalent of a check engine light ("something is wrong; check everything and see what it is").

A better car interface would show you the four tires and the pressures. Leaf Spy Pro does that - and it's an advantage. Tesla does that on the dash.

Re: Tire Registration

Posted: Wed Oct 11, 2017 8:41 pm
by BrockWI
I thought about resetting them after I rotate them viz leaf spy, but then I thought, why bother? As others have said the only "real" thing the car will tell you is if one is low.

Does the car really care which is which? As in if it saw the front left was low does it actually do anything at all or different from if it saw the back left was low?

Re: Tire Registration

Posted: Thu Oct 12, 2017 1:44 pm
by Turbo3
BrockWI wrote:I thought about resetting them after I rotate them viz leaf spy, but then I thought, why bother? As others have said the only "real" thing the car will tell you is if one is low.

Does the car really care which is which? As in if it saw the front left was low does it actually do anything at all or different from if it saw the back left was low?
The DTC error codes for TPMS problems will point to the wrong wheel. This could be a problem if the tech person does not verify correct registration or does not use the external TPMS tool to verify which wheel has the problem. But to the driver it makes no difference if they are not using LeafSpy to see the tire pressures. I like to know which tire needs a little air so I keep them registered correctly. But it is definitely a personal preference.

You can set LeafSpy to not show tire pressures at all if it really bothers you.

Re: Tire Registration

Posted: Thu Oct 12, 2017 1:50 pm
by BrockWI
I am fine with seeing it in Leaf Spy and I don't count on it being in the correct place, If I see a tire off I check them all manually, honestly I check them more manually than with Leaf Spy.

I was just wondering, if TMPS being in the wrong location could affect say ABS or traction control or do those systems just do what they do?

Re: Tire Registration

Posted: Thu Oct 12, 2017 5:15 pm
by Turbo3
BrockWI wrote:I am fine with seeing it in Leaf Spy and I don't count on it being in the correct place, If I see a tire off I check them all manually, honestly I check them more manually than with Leaf Spy.

I was just wondering, if TMPS being in the wrong location could affect say ABS or traction control or do those systems just do what they do?
I would not think TMPS is used for anything other than the tire warning light. Tires get moved around all the time.

Re: Tire Registration

Posted: Thu Nov 02, 2017 2:05 am
by ivh
Hello! I hope it's ok to "hijack" this thread for an additional question.

I got new winter tires for my Leaf 2013 S over the web, and their TPMS-sensors came pre-programmed. I was planning to register them with LeafSpyPro, but have not succeeded yet. I tried the procedure several times, it gets initiated (blinking yellow tire light) but never finishes. I double-checked the pressures and also tried a larger spread (2.6, 2.3, 2.0, 1.7 bar) as suggested by LeafSpy app maker.

Now I'm just wondering if anyone can think of a reason why this fails. (Otherwise I'll go to a shop soon, but they all are very busy now in changing season.)

cheers
thomas

Re: Tire Registration

Posted: Thu Nov 02, 2017 6:08 am
by brotherjethro
jlv wrote:
powersurge wrote:The TPMS goes on when ONE of them goes below a certain point. That ALERTS YOU that a tire is below pressure, and you should check ALL of them.
That is just because Nissan implemented a dummy-light on the dashboard. The car knows which of 4 sensors is reporting the low pressure -- in fact, the car knows what the exact tire pressures are. The car just doesn't tell you that because someone decided it's sufficient to just provide a the equivalent of a check engine light ("something is wrong; check everything and see what it is").

A better car interface would show you the four tires and the pressures. Leaf Spy Pro does that - and it's an advantage. Tesla does that on the dash.
I agree the car should show you the actual pressure values. Let me relate two experiences which demonstrate why:

1. I was driving my 3/4 ton truck, towing a travel trailer to our campsite. While crossing the Astoria-Megler bridge, I got a low pressure warning. This bridge is over 4 miles long, one lane each direction, with no shoulder. https://en.wikipedia.org/wiki/Astoria%E ... ler_Bridge The point being that if you need to stop and change a tire on this bridge, you will cause a massive traffic jam and probably get a visit from the police. Luckily, the truck showed me all the tire pressures on the display, and I was able to see that I still had safe pressure. I made it across the bridge, and while keeping a close eye on the pressure, drove another 10 miles to my campsite, where I changed the tire safely.

2. We also own a Honda CR/V. While driving Hwy 58 in Oregon at about 4 in the morning, I got a low pressure warning in the middle of nowhere. It was cold and dark, and not safe to pull over. Unfortunately the vehicle does not show the actual pressures, so I had to decide whether to pull over somewhere dangerous, or wait until I hit the next tiny town. The car seemed to handle fine, so I sweated it out and kept going about 15 miles into town. When I got out and measured all the tires, they were all fine, though there was a spread of about 4psi between them. Apparently this was enough to set off the alert. Had I been able to read the pressures while driving, I wouldn't have stopped or worried about it until it was convenient, later in the day. (Equalizing all the pressures and resetting the system is all that was required).

Re: Tire Registration

Posted: Thu Nov 02, 2017 10:42 am
by Turbo3
ivh wrote:Hello! I hope it's ok to "hijack" this thread for an additional question.

I got new winter tires for my Leaf 2013 S over the web, and their TPMS-sensors came pre-programmed. I was planning to register them with LeafSpyPro, but have not succeeded yet. I tried the procedure several times, it gets initiated (blinking yellow tire light) but never finishes. I double-checked the pressures and also tried a larger spread (2.6, 2.3, 2.0, 1.7 bar) as suggested by LeafSpy app maker.

Now I'm just wondering if anyone can think of a reason why this fails. (Otherwise I'll go to a shop soon, but they all are very busy now in changing season.)

cheers
thomas
You should take an ELM trace while trying to Register and send it to me for review.

Re: Tire Registration

Posted: Sat Nov 04, 2017 3:20 am
by ivh
Turbo3 wrote:You should take an ELM trace while trying to Register and send it to me for review.
Thanks! I will do that on Monday.