Volusiano
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Low tire pressure warning

Sat Sep 17, 2011 8:32 pm

My Leaf's low tire pressure warning came on yesterday. I measured them out and one was 36 psi, a couple at 35 psi, and one at 33 psi. I put them all back to 36psi and the low tire pressure warning light went away.

This makes me wonder what is supposed to be the trigger point for the warning light to come on? It looks like in my case, it goes on after a 10% drop or so.

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TomT
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Re: Low tire pressure warning

Sat Sep 17, 2011 9:29 pm

Interesting. I had read that is was 6 pounds low (30) but your experience would seem to contradict that...

Volusiano wrote:My Leaf's low tire pressure warning came on yesterday. I measured them out and one was 36 psi, a couple at 35 psi, and one at 33 psi. I put them all back to 36psi and the low tire pressure warning light went away. This makes me wonder what is supposed to be the trigger point for the warning light to come on? It looks like in my case, it goes on after a 10% drop or so.
59,991 miles/12 bars/289 Gids/68.54 AHr/101% SOH/101.64% Hx 7May15 w/ new Lizard (barely made the warranty).
71,770 miles/12 bars/256 Gids/59.04 AHr/88% SOH/87.92% Hx 3Mar16 at lease return.

Now driving a 2016 Volt Premier. Model 3 reserved.

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garygid
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Re: Low tire pressure warning

Sat Sep 17, 2011 10:07 pm

I thought these tire pressure sensors were not pre-set to a fixed "fault" pressure, but that they can be "initialized" at some "higher" pressure, and that the fault will occur at some fixed percentage of that "higher" value.

Does the service manual describe these, and now to initialize them?
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TonyWilliams
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Re: Low tire pressure warning

Sun Sep 18, 2011 1:35 am

I got the low pressure warning, and ignored it. Drove another mile or two, and the car started pulling to the right.

Hmmmm... pulled into tire shop. Flat tire.

LEAFfan
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Re: Low tire pressure warning

Sun Sep 18, 2011 1:56 am

Volusiano wrote:My Leaf's low tire pressure warning came on yesterday. I measured them out and one was 36 psi, a couple at 35 psi, and one at 33 psi. I put them all back to 36psi and the low tire pressure warning light went away.
This makes me wonder what is supposed to be the trigger point for the warning light to come on? It looks like in my case, it goes on after a 10% drop or so.


That sounds about right. My wife's Corolla's is set to come on at 28 (less than 10%) and the recommended pressure is 30. The recommended pressure for the LEAF is 36 so I'm guessing it may have come on when your tire was 34 and by the time you checked, it had dropped to 33.
2013 LEAF SV Del. 2/28/13
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TomT
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Re: Low tire pressure warning

Sun Sep 18, 2011 8:10 am

Here is what the service manual says about pressures:

DTC Display Item Malfunction detected condition. Possible causes:
C1704 LOW PRESSURE FL Front LH tire pressure drops to * kPa (* kg/cm2, * psi) or less.
C1705 LOW PRESSURE FR Front RH tire pressure drops to * kPa (* kg/cm2, * psi) or less.
C1706 LOW PRESSURE RR Rear RH tire pressure drops to * kPa (* kg/cm2, * psi) or less.
C1707 LOW PRESSURE RL Rear LH tire pressure drops to * kPa (* kg/cm2, * psi) or less.
*:196.5 kPa (2.0 kg/cm2, 28 psi) [Standard air pressure is for 250 kPa (2.5 kg/cm2,36 psi) vehicles.]
59,991 miles/12 bars/289 Gids/68.54 AHr/101% SOH/101.64% Hx 7May15 w/ new Lizard (barely made the warranty).
71,770 miles/12 bars/256 Gids/59.04 AHr/88% SOH/87.92% Hx 3Mar16 at lease return.

Now driving a 2016 Volt Premier. Model 3 reserved.

Volusiano
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Re: Low tire pressure warning

Sun Sep 18, 2011 11:45 am

TomT wrote:Here is what the service manual says about pressures:

DTC Display Item Malfunction detected condition. Possible causes:
C1704 LOW PRESSURE FL Front LH tire pressure drops to * kPa (* kg/cm2, * psi) or less.
C1705 LOW PRESSURE FR Front RH tire pressure drops to * kPa (* kg/cm2, * psi) or less.
C1706 LOW PRESSURE RR Rear RH tire pressure drops to * kPa (* kg/cm2, * psi) or less.
C1707 LOW PRESSURE RL Rear LH tire pressure drops to * kPa (* kg/cm2, * psi) or less.
*:196.5 kPa (2.0 kg/cm2, 28 psi) [Standard air pressure is for 250 kPa (2.5 kg/cm2,36 psi) vehicles.]
I'm pretty sure none of my tires dropped to 28 psi when my warning light came on. The lowest one was 33 psi.

I use one of those round analog tire pressure gauge that's supposed to be pretty accurate. I must admit that I measured and refilled them right after a trip and didn't give them a chance to cool down first. But even after they cooled down, I remeasured the pressure and they were still at the recommended pressure of 36 psi.

I would like to hear from others who've had their warning light come on to see what low pressure level their tires reached.

LEAFfan
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Re: Low tire pressure warning

Sun Sep 18, 2011 2:45 pm

Unless I have a leak from a nail or something, I doubt I will ever see the low pressure warning because I keep them at 41 for less rolling resistance. I have coasted in 'N' for over a mile already! I have a 'Milton' pen gauge that the Pros use. It's really heavy unlike the other inexpensive pen gauges. I've tried all kinds of other gauges, circular like what's on pumps, digital, etc., and they are all off (low) by several pounds.
2013 LEAF SV Del. 2/28/13
2013 LEAF World Record for Most Miles Driven On One Charge-188 miles/8.8 m/kW h
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wsbca
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Re: Low tire pressure warning

Sun Sep 18, 2011 2:58 pm

Volusiano wrote:
TomT wrote:Here is what the service manual says about pressures:

...28 psi) [Standard air pressure is 36 psi)
I'm pretty sure none of my tires dropped to 28 psi when my warning light came on. The lowest one was 33 psi.


We checked ours today and all were at 31 (now at 36) - no warning lights.
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ggodman
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Re: Low tire pressure warning

Sun Sep 18, 2011 10:21 pm

I've had my light on for a while now, finally filled them tonight, 1 @ 29 and 3 @ 30, this is strange, i'm not sure if they were not filled correctly or there is a slow leak with these tires, I will check pressure again in a couple weeks and let you know the results.

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