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LEAFer
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Re: Leaf Tire Pressure Monitoring?

Thu Jan 06, 2011 7:12 pm

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

I know of an owner of a Lexus whose wheels have been thru at least a handful (or more) of tire changes (due to frequent nails requiring removal and patching). One sensor was cracked during that repair process at a tire center, but continues to work fine. The car does not report actual pressures for each tire, only when a sudden or large drop in pressure occurs in any one tire, at which point it pops up an alert, without identifying the bad tire.
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GroundLoop
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Re: Leaf Tire Pressure Monitoring?

Thu Jun 23, 2011 11:54 am

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

I know of an owner of a Lexus whose wheels have been thru at least a handful (or more) of tire changes (due to frequent nails requiring removal and patching). One sensor was cracked during that repair process at a tire center, but continues to work fine. The car does not report actual pressures for each tire, only when a sudden or large drop in pressure occurs in any one tire, at which point it pops up an alert, without identifying the bad tire.

The LEAF sensors report PSI for each tire (along with serial number).

The "car" (dash) just turns it into an idiot light.

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Randy
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Re: Leaf Tire Pressure Monitoring?

Thu Jun 23, 2011 1:28 pm

Not sure that dealers will go to the trouble, but there is a process in the service manual to re-train the car so that when the tires are rotated the dash indication will be correct if a tire pressure sensor indicates a problem.

Same thing would apply when purchasing new tires, but that's a ways down the road....

GroundLoop
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Re: Leaf Tire Pressure Monitoring?

Thu Jun 23, 2011 1:54 pm

If I can get my hands on a Consult tool..

The TPMS serial numbers are shown on the device. Just knowing what the serial numbers are would likely make finding them in the CAN Bus stream much easier. I would guess the tire pressure data is nearby.

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garygid
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Re: Leaf Tire Pressure Monitoring?

Thu Jun 23, 2011 8:29 pm

The Nissan Tire Pressure Sensor (TPS) is a LOT more than $20, more like $90 one dealer said (as I recall).

Maybe one of the 0, 1, 2, 3 data series (with some missing points at times) we see is something like tire pressure?
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palmermd
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Re: Leaf Tire Pressure Monitoring?

Thu Jun 23, 2011 9:23 pm

GroundLoop wrote:If I can get my hands on a Consult tool..

The TPMS serial numbers are shown on the device. Just knowing what the serial numbers are would likely make finding them in the CAN Bus stream much easier. I would guess the tire pressure data is nearby.


I don't know if you wanted your actual serial number or just the format of the numbers off of a unit, but here is a picture of one of mine. Not the best image, but you can zoom in enough to read the format (3E1028).

Image
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TEG
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Re: Leaf Tire Pressure Monitoring?

Fri Jun 24, 2011 12:42 pm

garygid wrote:The Nissan Tire Pressure Sensor (TPS) is a LOT more than $20, more like $90 one dealer said (as I recall).


Do they have to be Nissan brand, or are these generic?

For instance, I noticed TireRack offers to provide and mount TPS if you buy wheels and tires together as a package.

rawhog
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Fri Jun 24, 2011 1:50 pm

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Last edited by rawhog on Fri Sep 09, 2011 1:50 pm, edited 1 time in total.
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LEAFfan
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Re: Leaf Tire Pressure Monitoring?

Fri Jun 24, 2011 3:31 pm

I wonder if one of our 'hackers' can change the reading for low pressure to 36 (have mine inflated to 41 which is supposedly the highest still-safe pressure).
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