Low tire pressure limp mode

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Aug 17, 2019 | 10:14 AM

billiardcue

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Racer

Joined: Feb 2004

Posts: 455

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From: Roanoke VA

Low tire pressure limp mode

Will low tire pressure cause a limp mode or rev limiting condition?
If so can this be changed in the ECM with EFI Live?

Aug 17, 2019 | 10:46 AM

JonMN

Safety Car

Joined: May 2016

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From: MN

^^^I don't think low pressure can cause limp mode. I just had a nail in a tire, and all I got was the low pressure warning.

Aug 17, 2019 | 10:47 AM

eboggs_jkvl

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Joined: Jun 2001

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From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati

2015 C7 of the Year Finalist

Guys run at the track w/o TPS in the wheels. I don't think you'll start limping.

Elmer

Aug 17, 2019 | 11:37 AM

billiardcue

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Racer

Joined: Feb 2004

Posts: 455

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From: Roanoke VA

Quote:

Originally Posted by eboggs_jkvl

Guys run at the track w/o TPS in the wheels. I don't think you'll start limping.

At the drag strip last night lowered tire pressure to 18 psi - M/T Street Radial - the car wouldn't rev above 5000.
There are sensors in the wheels.
I don't want to remove the sensors if they are the problem if I can disable them thru the computer. I use EFI Live.

Aug 18, 2019 | 05:26 PM

billiardcue

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Racer

Joined: Feb 2004

Posts: 455

Likes: 11

From: Roanoke VA

Quote:

Originally Posted by JonMN

^^^I don't think low pressure can cause limp mode. I just had a nail in a tire, and all I got was the low pressure warning.

Maybe not 'limp mode' but 'rev limiting' and/or 'torque limiting' mode.
It happened on 2 passes on the drag strip at WOT.
Car revved to 5k and shifted gears at less than full power.
Normally shifts around 6500 at WOT.

Aug 18, 2019 | 05:42 PM

Bill Dearborn

Tech Contributor

Joined: Oct 1999

Posts: 41,058

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From: Charlotte, NC (formerly Endicott, NY)

They connect to the BCM and EBCM not the ECM. If a low tire pressure warning is received the EBCM will adjust the stability control system to account for change in handling due to the low pressure.

Bill

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