Freeze Frame stats
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Junior User
Joined: Oct 2010
Posts: 62
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Freeze Frame stats
So I just realized that the OBD II scanner I have access to has a freeze frame, that pretty much tells me the stats of a bunch of crap going on. I don't have a clue what any of it means, so I figure I'd post it on here, and see if someone can tell me if it's good or bad.
Now mind you, I just plugged in the scanner to clear my CEL cause I have an ongoing problem with the EVAP system. The code is p0455, evap gross leak. I've had it for a while now so it's nothing new to me. But here is what came up in freeze frame just as the truck was parked and running when I scanned it...
Fuel Sys 1 - CL
Fuel Sys 2 - NA
Calc Load % - 49.0
ECT - 95C
STFT B1% - -1.5
LTFT B1% - +9.3
STFT B2% - -0.7
LTFT B2% - +8.5
Eng RPM 1769
Now I don't know where it got the RPM read at, because the truck never went above 1000RPM.
Someone please let me know if that all looks good? Thanks! =)
ALSO....if any of that seems whack, I've also got a bad EGR valve that is not fully closing all the way, therefore giving me a helluva vacuum leak, and absolutely horrible gas mileage.
Now mind you, I just plugged in the scanner to clear my CEL cause I have an ongoing problem with the EVAP system. The code is p0455, evap gross leak. I've had it for a while now so it's nothing new to me. But here is what came up in freeze frame just as the truck was parked and running when I scanned it...
Fuel Sys 1 - CL
Fuel Sys 2 - NA
Calc Load % - 49.0
ECT - 95C
STFT B1% - -1.5
LTFT B1% - +9.3
STFT B2% - -0.7
LTFT B2% - +8.5
Eng RPM 1769
Now I don't know where it got the RPM read at, because the truck never went above 1000RPM.
Someone please let me know if that all looks good? Thanks! =)
ALSO....if any of that seems whack, I've also got a bad EGR valve that is not fully closing all the way, therefore giving me a helluva vacuum leak, and absolutely horrible gas mileage.
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
The FF info was recorded when the CEL was activated.. that was not when it was in the driveway...
Your LTFT should be in the -1 to +5 range, you are running lean (probably the EGR leak) compensated by dumping in additional fuel (+ readings)
You are running CL (Closed Loop) which is good.
Running in this condition leaves you in danger of melting the CAT ($$$$).
Your LTFT should be in the -1 to +5 range, you are running lean (probably the EGR leak) compensated by dumping in additional fuel (+ readings)
You are running CL (Closed Loop) which is good.
Running in this condition leaves you in danger of melting the CAT ($$$$).
Logistics Pro
Joined: Jun 2009
Posts: 4,823
Likes: 83
From: Cedar Rapids, IA
A datatstream mode would tell you what's going on at the time you check it. Freeze Frame data is the capture of various parameters at the time the diagnostic code was set, which explains the engine RPM being higher than you expected.
The fuel trims don't look too bad. Long Term Fuel Trims (LTFT) would indicate it was running slightly lean for the most part, and the Short Term FT is attempting to compensate for a slight rich condition at the time to code was set. The fuel trim numbers indicate percentage change to the fuel injector pulse width - positive numbers are longer pulse width (more fuel) and negative numbers are shorter pulse width (less fuel).
An Engine Coolant Temperature (ECT) of 95C is 203 degrees F so that's about right. The engine was up to temperature at the time.
Overall none of the parameters would necessarily raise a flag.
-Rod
The fuel trims don't look too bad. Long Term Fuel Trims (LTFT) would indicate it was running slightly lean for the most part, and the Short Term FT is attempting to compensate for a slight rich condition at the time to code was set. The fuel trim numbers indicate percentage change to the fuel injector pulse width - positive numbers are longer pulse width (more fuel) and negative numbers are shorter pulse width (less fuel).
An Engine Coolant Temperature (ECT) of 95C is 203 degrees F so that's about right. The engine was up to temperature at the time.
Overall none of the parameters would necessarily raise a flag.
-Rod
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