1G O2 open loop questions

[jbeaton9292]

ok so im having some problems my car is stuck in open loop mode i dont know how to post an idle log so ill say what im logging and what its showing

rpm 850
timing 3.9deg
boostest -21.5j
afratioest 13.9
maf 40.2
mafraw 36.7
throtpos 0%
fronto2 0.04v
knockret 0.0deg
cooltemp 167
airflowperrev 0.28
closedloop 0
cominedft 0%
openloop 1
fuelflow 18.78cc/min
idlesw 1

does all this mean that my o2 is bad im not simulating it through link this is the factory 02 sensor im not throwing any codes on the car please help thanks in advance

 

[gieri002]

Most likely it's your o2. However, the important thing to look for here is that your o2 is cycling within range. Are you seeing movement or is it a constant 0.04v?

If your o2 sensor doesn't switch around 0.5v for over 20 seconds while running in closed loop mode the ECU locks itself in open loop.

The o2 is a 0-1v sensor, 0v is lean - .5v is stoich - 1v is rich.

 

[jbeaton9292]

Most likely it's your o2. However, the important thing to look for here is that your o2 is cycling within range. Are you seeing movement or is it a constant 0.04v?

If your o2 sensor doesn't switch around 0.5v for over 20 seconds while running in closed loop mode the ECU locks itself in open loop.

The o2 is a 0-1v sensor, 0v is lean - .5v is stoich - 1v is rich.

yes it sits at a constant .04 never moves so should be o2 then

 

[pauleyman]

What about coolant temp? You didn't notice how cold it is?

 

[snowborder714]

Check out all the reasons that can throw the ECU into open loop. If the front o2 not switching is the only one that might be an issue, try replacing the sensor. Otherwise, check out the other problems first.
fueltrimupdatepoints [ECMTuning - wiki]

 

[gieri002]

What about coolant temp? You didn't notice how cold it is?

His coolant temp is fine. He said he logged 167 in the first post. That is important though. Good luck with the o2 sensor replacement, those original ones can be a huge pain sometimes!

 

[lowboost13]

This happened to my friend it happened to be a setting in link.

 

[92AWDHX40]

Im dealing with the same thing too working on it.

 

[snowborder714]

This happened to my friend it happened to be a setting in link.

Did he accidentally (or on purpose, just without knowledge of function) check the "Lock in open loop" box?

 

[pauleyman]

I thought the switch point was 180

 

[snowborder714]

In case people are too lazy to go to the link above.

The ECU will force open loop mode for a number of different reasons. The following is intended to list out the more common reasons. If any one of these is true, then the ECU will run in full open loop mode. That is, STFT will not be used and, of course, learn mode will not be active either.

1G Open loop mode (any one true)

• Throttle position too high (varies by RPM)
• Airflow too low (units are tricky, but it's very low)
• Coolant temp < 87F
• The O2 sensor did not switch around 0.5v for over 20 seconds while running in closed loop mode. In that case, the ECU locks itself in open loop mode.

 

[Phantom DSM]

I thought the switch point was 180

On 2gs thats about right usualy at 183 i believe. From what i notice on 1gs the learn mode switch around 187-190

 

[snowborder714]

Well, now you're talking about two different things - open loop mode and learn mode. Let's not mix those up.

 

[Phantom DSM]

Well, now you're talking about two different things - open loop mode and learn mode. Let's not mix those up.

sorry went off topic a bit.
O2 sensor may be the culprit here, you can test ohm resistance on sensor plug and open loop not checked as said above.

 

[jbeaton9292]

sorry went off topic a bit.
O2 sensor may be the culprit here, you can test ohm resistance on sensor plug and open loop not checked as said above.

well now i have more problems go figure. gotta love a dsm, anyway i replaced the o2 with a brand new sensor i got it wired in and now it was cycling and all of a sudden its not cycling enless im on the gas free reving. my coolant temp wont get above 10* and the car wont start enless i hold the gas to the floor then it starts so i went into my settings and locked my coolant temp now the car starts properly. the car is going closed loop but running 10.4 afr and when i lock in open loop it idles at 14.3 afr but when i drive it its driving like crap still so anyway i decided to start digging and i found that i was running on only cylinder 2 and 3 now here is the weird thing i just replaced the plugs with ngk iridium bought new coil pack and ptu and wires all when i put the motor in which is less than 2k miles ago any ideas anyone

im so sick of this car its really trying to push me to my limit and its doing a good job too!

 

[92AWDHX40]

Hey its a dsm, its love hate I still love to hate mine but that's unusual all that, and still problems. Im still working on mine maybe I can get out there and see what link is doing with mine. Still not sure if its cycling yet.