# OBDII freeze frame data interpretation

**URL:** <https://community.cartalk.com/t/obdii-freeze-frame-data-interpretation/112333>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, equinox\
**Created:** [February 15, 2018, 10:47pm UTC](https://community.cartalk.com/t/obdii-freeze-frame-data-interpretation/112333 "2018-02-15T22:47:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![BBG](https://avatars.discourse-cdn.com/v4/letter/b/b4bc9f/32.png) [@BBG](https://community.cartalk.com/u/BBG)\
**Post date:** [February 15, 2018, 10:47pm UTC](https://community.cartalk.com/t/obdii-freeze-frame-data-interpretation/112333/1 "2018-02-15T22:47:17Z")

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Freeze Frame:

DTCFR2F P0191

Fuel SYS1 CL

Fuel SYS2 N/A

Load PCT 27.1

ETC (F) 181

ShrtFT1 (%) -2.3

Long FT1 % 26.6

FPR (psi) 59.2

Map kpa 11.5

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [February 16, 2018, 3:44am UTC](https://community.cartalk.com/t/obdii-freeze-frame-data-interpretation/112333/2 "2018-02-16T03:44:57Z")

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The “ETC” means the coolant temperature is 181 deg F. That’s a typo, it probably says ECT, right? Engine coolant temperature. That seems ok.

> [@BBG](#):
>
> ShrtFT1 (%) -2.3
> 
> Long FT1 % 26.6

Short and Long term fuel trims. A 26.6 % long term fuel trim means the computer is needing to inject an extra 26.6% more gasoline (to satisfy the O2 sensor) than it thinks would be required for that operating condition. That’s a problem. The engine is running too lean for some reason.

> [@BBG](#):
>
> FPR (psi) 59.2

That’s probably the fuel rail pressure, 59.2 pounds per square inch. That sounds ok. Verify by checking the fuel pressure specs for your engine.

> [@BBG](#):
>
> Map kpa 11.5

MAP == manifold absolute pressure of 11.5 kpascals . A kpa is about 0.15 psi, so that’s about 1.7 psi. Or 3.5 inches of mercury. I think that’s too low. The typical idle manifold would be around -20 in hg vacuum, or about 30-20 = 10 inches of mercury absolute. (30 inches of mercury is sea level atmosphere pressure) . It appears you may have a problem with your MAP sensor. That could cause a lean condition. (Double check that your MAP reading isn’t adjusted to sea level pressure, if so that would change the diagnosis.)

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**Author:** ![keith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/keith/32/5518_2.png) [@keith](https://community.cartalk.com/u/keith)\
**Post date:** [February 17, 2018, 12:41am UTC](https://community.cartalk.com/t/obdii-freeze-frame-data-interpretation/112333/3 "2018-02-17T00:41:17Z")

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[https://www.obd-codes.com/p0191](https://www.obd-codes.com/p0191)

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [February 17, 2018, 12:48am UTC](https://community.cartalk.com/t/obdii-freeze-frame-data-interpretation/112333/4 "2018-02-17T00:48:29Z")

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Yes, it is interesting that the diagnostic code is for fuel pressure rather than for the map sensor.