kolmstead
Posts: 479
Joined: Mon Aug 09, 2010 9:07 pm
Delivery Date: 15 Jan 2011
Leaf Number: 000257
Location: Ridgecrest, California (100 miles east of Bakersfield)

OAT indicator reads low

Wed Feb 02, 2011 3:24 pm

This one is petty, but a little annoying. The LEAF has an outside air temperature sensor located up front. Mine reads at least ten degrees Fahrenheit lower than actual outside temperature, compared with numerous thermometers and a calibrated weather station at work. For several days I was wondering why it felt pretty nice out in the morning despite the 25 F reading in the car. Eventually I figured out that the car was wrong. The error seems to diminish as temps go up; at 70 degrees, it's probably close to nil.

Apparently Nissan knows about this one; there's a disclaimer in the owner's manual that the car's indicator will probably not agree with other sources. If that's the case, why bother? And what's this low OAT warning at 38 degrees about? Is something bad supposed to happen at that temp?

Just my personal bias as an instrumentation guy. Better to display no data than incorrect data...

-Karl

User avatar
GeekEV
Posts: 1825
Joined: Tue Jan 18, 2011 4:11 pm
Delivery Date: 15 Feb 2011
Leaf Number: 0308
Location: NorCal, USA

Re: OAT indicator reads low

Wed Feb 02, 2011 4:09 pm

At 37/38 and below you're much more likely to encounter black ice on the road if there's any moisture at all. It's warning you to be careful.

2014 Chevy Spark EV 2LT
2013 Tesla Model S 60kWh[/url]
AV L2 EVSE + kWh meter
9.4kW Solar Array + enphase energy

Rat
Posts: 955
Joined: Sun Apr 25, 2010 7:47 pm
Delivery Date: 08 Sep 2011
Location: Silicon Valley
Contact: Website Twitter

Re: OAT indicator reads low

Wed Feb 02, 2011 9:38 pm

My Volvo lights up a little snowflake on the dash somewhere around there, maybe at 35 or so. Same reason, I'm sure.
2011 SL down to 9 capacity bars
OnWords

User avatar
EVDRIVER
Moderator
Posts: 6687
Joined: Sat Apr 24, 2010 7:51 am

Re: OAT indicator reads low

Wed Feb 02, 2011 9:51 pm

Karl,

I could not agree more. My Toyota truck and other brand cars I have owned have had decent accuracy on the temp sensors and the clocks were always perfect. I have never been a Nissan owner because I always felt there cars were not up to par with the quality of other brands at some levels although they have been improving. Making an accurate temp sensor and clock is as simple as it gets, if they can'e get it within + - 2 degrees F then it does not belong there. If their clocks really are off minutes each week they need to fire some engineers or take them out. A high tech car should not have such gross errors like this. Even the most basic temp sensors have calibration adjustments, what's the point of the fancy telematics if you can't fix these issues. Makes me wonder about their pack sensors. Anyone checked the speedometer?

LEAFfan
Posts: 4828
Joined: Fri Apr 23, 2010 6:08 pm
Delivery Date: 08 Jun 2011
Leaf Number: 1855
Location: Phoenix Area

Re: OAT indicator reads low

Wed Feb 02, 2011 11:37 pm

EVDRIVER wrote:Anyone checked the speedometer?
You must have missed an earlier post from Skywagon. He said it is only off by +1 according to his GPS. I have yet to see a speedo be low. Most I've seen are off by +4-5 mph. My Honda Civic was off by +4 until I changed the tire size. Now it's only +1 all the way up to 75mph.
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
4.8 kW DC PV ($ .91/W fully installed)/ Dec., 2010

User avatar
garygid
Gold Member
Posts: 12464
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: OAT indicator reads low

Wed Feb 02, 2011 11:54 pm

Speedometer is required by law to read high, I believe.
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

LEAFfan
Posts: 4828
Joined: Fri Apr 23, 2010 6:08 pm
Delivery Date: 08 Jun 2011
Leaf Number: 1855
Location: Phoenix Area

Re: OAT indicator reads low

Thu Feb 03, 2011 12:19 am

garygid wrote:Speedometer is required by law to read high, I believe.
Since when? When I had VW Rabbits (77-84) with VDO gauges, the speedo was exactly 60 at 60mph. I've never seen more accurate gauges since so that's why I'm wondering if and when that became a law to be high.
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
4.8 kW DC PV ($ .91/W fully installed)/ Dec., 2010

User avatar
garygid
Gold Member
Posts: 12464
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: OAT indicator reads low

Thu Feb 03, 2011 2:31 am

I thought (do not know the law or ruling) that the US requires the manufacturer-displayed speed readings to be a percent high, and Europe requires more, like perhaps 2% high. But, I could be wrong.

Note that many/most/all/some built-in GPS Nav systems do not display speed at all.

However, most hand-held GPS Nav devices do.
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

User avatar
turbo2ltr
Posts: 1376
Joined: Fri Jul 30, 2010 11:13 pm
Delivery Date: 04 Feb 2011
Leaf Number: 185
Location: Phoenix, AZ

Re: OAT indicator reads low

Thu Feb 03, 2011 8:21 am

My 01 Grand Cherokee matches my GPS exactly. The OAT reads a little weird sometimes though.
Silver SL-e
Ford F450 Crew Cab Hybrid Conversion

BnBinSD
Posts: 60
Joined: Wed Dec 29, 2010 11:08 am
Delivery Date: 11 May 2011
Leaf Number: 2255
Location: Alpine, CA

Re: OAT indicator reads low

Fri Feb 04, 2011 8:44 pm

Regarding the accuracy of any speedometer, be aware that this will vary with the age of your tires and their wear impacting the overall diameter. The best source of tire information I've found online is at TireRack. I've found many of my assumptions about tires proven incorrect using their research, which they actually perform.

Try the link below, then click the Speedometer Accuracy link. There's a chart there you can use to verify your speedometer.

http://www.tirerack.com/tires/tiretech/tiretech.jsp

[quote="garygid"]I thought (do not know the law or ruling) that the US requires the manufacturer-displayed speed readings to be a percent high, and Europe requires more, like perhaps 2% high. But, I could be wrong.
Driving my Glacier Pearl SL ETEC is a joy, like a magic carpet!
7.5 kW PV in Alpine, CA
Thank-you Nissan, for your bravery, conviction and willingness to actually manufacture the Leaf!

Return to “Problems / Troubleshooting”