No O2 Function

N

Nightmare

Member
I’ve checked the exh fuse and am running brand new NTK sensor. What else should I check? Car starts and runs. Thank you!
 
N

Nightmare

Member
Thank you for your response.

I did a quick log at idle and sent to tuner. He said no O2 function to use GM or NTK sensor and check fuse. If my AF gauge is correct it’s hitting 7.
 
G

Gtstorey

Goblin Guru
Are the dtc's for the o2 sensor turned off in the tune?

Not really much to work with here so far to trouble shoot. Have you confirmed it is plugged in? Have you confirmed continuity from the sensor to the ECM?

I don't know that an engine would run at an A/F ration of 7.
 
N

Nightmare

Member
Not sure, I will ask.

it is plugged in and I have checked wire from sensor to ECM.

Tuner didn’t mention either of those things not working, I will ask.

Not sure if AFR gauge is accurate or not.

thank you for your help.
 
Rauq

Rauq

Goblin Guru
If the tuner is not seeing O2 function then my first guess would not be misconfiguration in the tune, unless the wideband is wired (or not wired) into the ECM in a way where the tuner can't find it.

Do you have two narrowbands and a wideband, or what?
Is it the narrowband or wideband O2 sensor the tuner is having an issue with?
If it's the wideband, what wideband is it? Does it have its own gauge? Does that work?
How's the wideband hooked into the ECM, or where's it hooked into?
What's no O2 function mean? Can't find the channel, reading is high/low/static?
What's 7 AFR mean? I don't think most widebands will show richer than .68λ which is 10:1 AFR on gas or 6.6:1 on E85
 
N

Nightmare

Member
I’m working on getting a hold of the tuner via phone to get all these questions answered. Thank you for your help, I’m learning.
 
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