GR86 TPMS Light

leosayer said:
So if I want to run lower pressures (say 2.2 bar) do I have to do a reset after adjusting the pressure?
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No, if you did that I think it would show 2.4 bar, you would need to inflate to 2.4 bar, reset it, then let them down to 2.2. The display should then show 2.2 bar
 
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86GR said:
No, if you did that I think it would show 2.4 bar, you would need to inflate to 2.4 bar, reset it, then let them down to 2.2. The display should then show 2.2 bar
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The system doesn't know what the correct tyre pressures for your tyres are. It just measures a significant change in pressures from the point it was last reset.

So if you're intentionally dropping your tyre pressures to 2.2, you should reset the system again, otherwise it will measure it from 2.4 or whatever it was reset at previously and alert you any time the tyres are cold.
 
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beorg said:
The system doesn't know what the correct tyre pressures for your tyres are. It just measures a significant change in pressures from the point it was last reset.

So if you're intentionally dropping your tyre pressures to 2.2, you should reset the system again, otherwise it will measure it from 2.4 or whatever it was reset at previously and alert you any time the tyres are cold.
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It’s not totally clear to me how it works, I thought I’d read somewhere resetting it calibrates the readout, but think your explanation might be correct and maybe the reset just sets the baseline for the low pressure warning.
 
How does the car know what corner each wheel is at? I'm thinking of rotating for wear soon but even as they are I'm not convinced that they are correct on the same axle. The tyres I think would heat more and increase pressure on the drive I'm on seem to be opposite to what I'd expect.
 
KobayashiMaru86 said:
How does the car know what corner each wheel is at? I'm thinking of rotating for wear soon but even as they are I'm not convinced that they are correct on the same axle. The tyres I think would heat more and increase pressure on the drive I'm on seem to be opposite to what I'd expect.
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The usual setup is to have a receiver in each corner.

It should be easy to check they are working correctly by letting some air out of one tyre.

What pressure changes are you experiencing? I would expect the fronts to heat more because of steering, braking, weight of the engine and heat soak from the engine. Unless you've been doing donuts or drifting!
 
My TPMS light stayed on from pickup on day 1. Took back to Dealer, who fixed and said that the sensors / system needed woken-up.
 
ravydavygravy said:
What does the over-inflating do?

I don't understand.

TPMS is doing my tits in.
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In what way?
If you're getting TPMS warnings simply because the cold weather has set in and the pressure drops enough to trigger it, you can try doing what I did - let the tyres down a little (say, 28PSI), then reset the TPMS system so 28PSI becomes it's set value. Then just pump the tyres back up to 35PSI (or whatever sir prefers).

That should give you more than enough leeway - it's unlikely to get cold enough for the tyre pressure to drop back to 28PSI and trigger annoying warnings, but you'll still get it come up in good time in the event of a genuine pressure loss caused by a puncture or whatever.
 
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Conscript said:
In what way?
If you're getting TPMS warnings simply because the cold weather has set in and the pressure drops enough to trigger it, you can try doing what I did - let the tyres down a little (say, 28PSI), then reset the TPMS system so 28PSI becomes it's set value. Then just pump the tyres back up to 35PSI (or whatever sir prefers).

That should give you more than enough leeway - it's unlikely to get cold enough for the tyre pressure to drop back to 28PSI and trigger annoying warnings, but you'll still get it come up in good time in the event of a genuine pressure loss caused by a puncture or whatever.
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Warnings all over the shop. Reset it and it lasts two minutes before more warnings.

I tried that and it didn't work. Need to try again.

I'm confused by the over-inflate/deflate then set the tpms. Surely it sets at the deflated value?
 
ravydavygravy said:
Warnings all over the shop. Reset it and it lasts two minutes before more warnings.

I tried that and it didn't work. Need to try again.

I'm confused by the over-inflate/deflate then set the tpms. Surely it sets at the deflated value?
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Yeah. But if you set it at the deflated value, and then just inflate back to your normal pressure, it stops warnings coming up just because the tyre pressure drops a little in the cold. The warning only happens if pressure drops below a certain threshold, not if you inflate over it.

But it sounds like you have a different issue if you're resetting the system and it's still going off without any actual pressure drops. Perhaps time to call a priest.
 
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GRMatt74 said:
I was going to do that until I read on here to pump up to 40 psi and then let down to 35.
Worked straight away.
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@GRMatt74 Pumping up to 40psi is probably what the dealer did. It sounds like getting pumping up to 40psi is what wakes up and activates the sensors to work. Then let down to the running pressure and set.
 
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Noel McC said:
@ravydavygravy Believe that over inflating to at least 40psi re-awakens / calibrates turns sensors on. Then deflate to running pressures, reset with glovebox button and drive a few miles to the car relearns that those sensors belong to that car.
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Thanks.

The manual is very vague - wait a few minutes. Assume because the sensors only transmit intermittently. Will try wake them up with 40 psi.
 
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