Anyone that can shine some light on ECU/OBD data

001Stunna · Nov 23, 2011

Being a bit overly obsessive about somethings lately i've been monitoring the data below to see if there's anything weird i can notice. Reason being...i feel that the car still runs rich.

Anyone who can shed some light on the data below...trends or etc...
I tried to take a snapshot every ~500rpm from idle up to ~3500 and then back to idle.

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 27.8
ETC(°C) 101
SHRTFT1(%) -13.3
LONGFT1(%) -8.6
MAP(kPa) 29
RPM(/min) 761
VSS(km/h) 0
SPARKADV(°) 12
IAT(°C) 54
TP(%) 9.4
O2S B1S12--B2S----
O2B1S1(V) 0.210
SHRTFTB1S1(%) -10.
O2B1S2(V) 0.075
SHRTFTB1S2(%) -5.5
OBD OBD2
------------------

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 27.1
ETC(°C) 103
SHRTFT1(%) -9.4
LONGFT1(%) -9.4
MAP(kPa) 27
RPM(/min) 966
VSS(km/h) 0
SPARKADV(°) 20
IAT(°C) 55
TP(%) 11.8
O2S B1S12--B2S----
O2B1S1(V) 0.780
SHRTFTB1S1(%) -7.0
O2B1S2(V) 0.760
SHRTFTB1S2(%) -3.9
OBD OBD2
------------------

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 27.1
ETC(°C) 103
SHRTFT1(%) -10.9
LONGFT1(%) -8.6
MAP(kPa) 27
RPM(/min) 1054
VSS(km/h) 0
SPARKADV(°) 19
IAT(°C) 55
TP(%) 10.2
O2S B1S12--B2S----
O2B1S1(V) 0.780
SHRTFTB1S1(%) -10.
O2B1S2(V) 0.505
SHRTFTB1S2(%) -7.8
OBD OBD2
-----------------

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 25.1
ETC(°C) 103
SHRTFT1(%) -3.1
LONGFT1(%) -9.4
MAP(kPa) 25
RPM(/min) 1526
VSS(km/h) 0
SPARKADV(°) 28
IAT(°C) 55
TP(%) 12.9
O2S B1S12--B2S----
O2B1S1(V) 0.780
SHRTFTB1S1(%) -3.1
O2B1S2(V) 0.835
SHRTFTB1S2(%) -1.6
OBD OBD2
---------------

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 26.7
ETC(°C) 103
SHRTFT1(%) -3.1
LONGFT1(%) -9.4
MAP(kPa) 26
RPM(/min) 2095
VSS(km/h) 0
SPARKADV(°) 30
IAT(°C) 55
TP(%) 14.5
O2S B1S12--B2S----
O2B1S1(V) 0.780
SHRTFTB1S1(%) 1.6
O2B1S2(V) 0.410
SHRTFTB1S2(%) -0.8
OBD OBD2
--------------------

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 27.1
ETC(°C) 105
SHRTFT1(%) 3.1
LONGFT1(%) -9.4
MAP(kPa) 27
RPM(/min) 2399
VSS(km/h) 0
SPARKADV(°) 30
IAT(°C) 55
TP(%) 15.3
O2S B1S12--B2S----
O2B1S1(V) 0.780
SHRTFTB1S1(%) -1.6
O2B1S2(V) 0.740
SHRTFTB1S2(%) 0.0
OBD OBD2
-------------------

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 26.7
ETC(°C) 105
SHRTFT1(%) 2.3
LONGFT1(%) -9.4
MAP(kPa) 26
RPM(/min) 2534
VSS(km/h) 0
SPARKADV(°) 31
IAT(°C) 55
TP(%) 15.7
O2S B1S12--B2S----
O2B1S1(V) 0.780
SHRTFTB1S1(%) -1.6
O2B1S2(V) 0.700
SHRTFTB1S2(%) 1.6
OBD OBD2
----------------

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 26.7
ETC(°C) 105
SHRTFT1(%) 0.0
LONGFT1(%) -9.4
MAP(kPa) 27
RPM(/min) 2910
VSS(km/h) 0
SPARKADV(°) 33
IAT(°C) 55
TP(%) 16.5
O2S B1S12--B2S----
O2B1S1(V) 0.760
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.780
SHRTFTB1S2(%) 0.0
OBD OBD2
--------------------

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 27.1
ETC(°C) 107
SHRTFT1(%) -0.8
LONGFT1(%) -9.4
MAP(kPa) 27
RPM(/min) 3001
VSS(km/h) 0
SPARKADV(°) 33
IAT(°C) 55
TP(%) 17.6
O2S B1S12--B2S----
O2B1S1(V) 0.625
SHRTFTB1S1(%) 8.6
O2B1S2(V) 0.895
SHRTFTB1S2(%) 8.6
OBD OBD2
--------------------

DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 29.4
ETC(°C) 107
SHRTFT1(%) 4.7
LONGFT1(%) -9.4
MAP(kPa) 30
RPM(/min) 3602
VSS(km/h) 0
SPARKADV(°) 33
IAT(°C) 55
TP(%) 19.2
O2S B1S12--B2S----
O2B1S1(V) 0.640
SHRTFTB1S1(%) 4.7
O2B1S2(V) 0.895
SHRTFTB1S2(%) 3.1
OBD OBD2
--------------------DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 46.3
ETC(°C) 109
SHRTFT1(%) -10.9
LONGFT1(%) -9.4
MAP(kPa) 22
RPM(/min) 1079
VSS(km/h) 0
SPARKADV(°) 8
IAT(°C) 55
TP(%) 9.4
O2S B1S12--B2S----
O2B1S1(V) 0.820
SHRTFTB1S1(%) -16.
O2B1S2(V) 0.915
SHRTFTB1S2(%) -18.
OBD OBD2
--------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT(%) 33.7
ETC(°C) 109
SHRTFT1(%) -14.8
LONGFT1(%) -9.4
MAP(kPa) 33
RPM(/min) 767
VSS(km/h) 0
SPARKADV(°) 13
IAT(°C) 57
TP(%) 9.4
O2S B1S12--B2S----
O2B1S1(V) 0.155
SHRTFTB1S1(%) -12.
O2B1S2(V) 0.075
SHRTFTB1S2(%) -12.
OBD OBD2

adrenalinas · Dec 8, 2011

Hi. what program you are using for dataloging? what interface? you could upload log file somewhere and post a link here. I will do so too if you're interested. but i have f20b6 engine so data will be slightly different

AFAccord · Dec 8, 2011

Your ECT goes from 101 to 109, meaning your car is warming up (~180 is normal operating temp), and your ECU is dumping fuel as it should. What's the problem here?

001Stunna · Dec 8, 2011

adrenalinas said:
Hi. what program you are using for dataloging? what interface? you could upload log file somewhere and post a link here. I will do so too if you're interested. but i have f20b6 engine so data will be slightly different

I used an MaxiDiag PRO MD801 OBD2 code reader that has live scan/recording capability.

AFAccord said:
Your ECT goes from 101 to 109, meaning your car is warming up (~180 is normal operating temp), and your ECU is dumping fuel as it should. What's the problem here?

The temp is in Celsius, not in Fahrenheit.
so..213.8 ºF - 228.2 ºF
...one thing i've been trying to make reason of is the fact that both LTFT and STFT are in negative most of the time, which to me means that something is off as even the ECU itself sense too much fuel is being dumped and is trying to cutback.

AFAccord · Dec 8, 2011

001Stunna said:
The temp is in Celsius, not in Fahrenheit.
so..213.8 ºF - 228.2 ºF

Ahh... didn't see that the first time I read it on my phone. That's still a bit on the hot side. Normally I like to see 184-194, maybe up to 200 on a hot day.

001Stunna said:
...one thing i've been trying to make reason of is the fact that both LTFT and STFT are in negative most of the time, which to me means that something is off as even the ECU itself sense too much fuel is being dumped and is trying to cutback.

Fuel trim being negative is not a definitive indicator of a problem. +10/-10 is pretty normal. Stock Honda ECU's run pretty rich anyway. Other than obsessiveness over these numbers, is there any other reason you think it's running super rich? Are you having any drivability problems? When was the last time you changed your plugs or your O2 sensors? How many miles does the car have on it? Have you tried resetting the ECU to clear the LTFT's as the weather gets colder?

001Stunna · Dec 8, 2011

AFAccord said:
Ahh... didn't see that the first time I read it on my phone. That's still a bit on the hot side. Normally I like to see 184-194, maybe up to 200 on a hot day.

Fuel trim being negative is not a definitive indicator of a problem. +10/-10 is pretty normal. Stock Honda ECU's run pretty rich anyway. Other than obsessiveness over these numbers, is there any other reason you think it's running super rich? Are you having any drivability problems? When was the last time you changed your plugs or your O2 sensors? How many miles does the car have on it? Have you tried resetting the ECU to clear the LTFT's as the weather gets colder?

Car has about 226XXXkm(140XXX miles) on it right now.

My obsessiveness started a few years ago(late 2009) when i was getting a too lean code(p0171) followed by oem cat going bad.

Short story is..
-code came up for the first time on a trip Toronto-Montreal(6hour trip). I checked and reset it and continued the trip. It didn't come back until on the drive back to Toronto 5mins before arriving home.
-took the car to a close-by shop as i was going to New York in 2 days, they changed the wrong sensor(one on cat instead of one on exhaust manifold) to cure the too lean code.
-on my trip to NY the too lean code came up again so i called the shop to give them **** and found out they changed the sensor on the cat with a universal one.
-once back home i ordered and changed both o2 sensors with Denso OE FIT sensors
-returned the Denso OE FIT Sensors and bought OEM o2 sensors from OEMACURAPARTS; changed FPR with one ordered of RockAuto after reading about too lean code being caused by moisture etc existing in the FPR vacuum lines etc.
-Within the last year pcv valve, plugs, cap/rotor, seafoam, bg44k, t.belt and pump has been done.

Before the too lean code and cat going bad i was getting a guaranteed 9-10L/100km(26.13-23.52mpg). After such issues it started going downhill and settled at 12-13L/100km(19.60-18.09mpg)

The car drives great, no hesitating in any way shape or form. Only other change i can think off is moving houses and now the car being parked outside versus an underground garage before. Nevertheless in the winter (then and now) i wait about 5mins before driving off; and about 1-2mins in the summer.

More about the cause to my obsessiveness lolz
http://www.6thgenaccord.com/forums/showthread.php?t=23814
http://www.6thgenaccord.com/forums/showthread.php?t=24598
http://www.6thgenaccord.com/forums/showthread.php?t=25899
http://www.6thgenaccord.com/forums/showthread.php?t=32890

adrenalinas · Dec 9, 2011

my data table

graph with scanXL program and elm327 USB interface

secondary O2 sensor is not logged.
and i'm having bad mileage. 15.5L/100km (15.18 MPG) and can't find any problems why it is so.
changed everything except HT leads, but they seems to be good.
Car is about 150k km ~100'000 miles. automatic transmission. Catalytic converter looks like new. (checked by myself, no signs of clogging). no errors at the moment. I did ECU reset procedure before doing log. ran for ~200km and then did this log.

any suggestions where should i search problems? no one in my city can find why is so

I need some info also. Which one SHRTFT shows what mixture i have. and which one shows one ecu is doing. i believe they should be different. maybe even opposite or smth like that.

and where from dataloger get SHRTFT3 if there is only two sensors?

i attached log in XLS format http://www.2shared.com/file/HUMr-_C_/log_stoppped.html

one more question. does anybode knows what LAF sensor voltage means? For example what AFR is at 0.2V,0.8V etc?

Jevik · Apr 9, 2012

Did you discover the cause of this issue? My cars currently at a +17-21% for STFT and LTFT

001Stunna · Apr 9, 2012

Jevik said:
Did you discover the cause of this issue? My cars currently at a +17-21% for STFT and LTFT

From my reads around a -/+ 10 is usually ok...if yours are more then that though, something is off. Check your front o2 sensor for voltage output, try some fuel injector cleaner, clean/replace air filter and do a tuneup and reset ECU and check it again.

Jevik · Apr 10, 2012

O2 sensor is brand new, oem. Air filter brand new(short ram intake, non-oiled), ran several containers of injector cleaner, Sparks new, full tuneup, cleaned map sensor and egr.. all it did was trip the check engine light 60 miles later... same data.

I did change the fuel pressure regulator today and the light went off, like it usually does. so im hoping that was it. I'll know for sure if it acts up again, but it seems like it picked up a couple ponies... :huh: