Interpreting O2 sensor readings...
#1
#2
Hello Zig,
A discussion about interpreting O2 sensor readings might not be a quick one!
However in a nutshell, the voltage readings from the sensors "switch" between zero and about 1.2 volts a few times every second.
Lean vs. rich is usually interpreted by the Long-Term Fuel Trim, which comes from data collected from the O2 sensors over time. In general, LTFT value in the negative range indicates rich running, while a value in the positive range indicates lean running.
Much debate usually ensues about the meaning of these readings and how they relate to the health and well-being of the engine.
My two AJ16s seem to settle into the range of -3.1 to -3.9, according to my generic scan tool.
Others here might provide more insight...
A discussion about interpreting O2 sensor readings might not be a quick one!
However in a nutshell, the voltage readings from the sensors "switch" between zero and about 1.2 volts a few times every second.
Lean vs. rich is usually interpreted by the Long-Term Fuel Trim, which comes from data collected from the O2 sensors over time. In general, LTFT value in the negative range indicates rich running, while a value in the positive range indicates lean running.
Much debate usually ensues about the meaning of these readings and how they relate to the health and well-being of the engine.
My two AJ16s seem to settle into the range of -3.1 to -3.9, according to my generic scan tool.
Others here might provide more insight...
The following users liked this post:
Ziggy (09-04-2013)
#3
Hello Zig,
A discussion about interpreting O2 sensor readings might not be a quick one!
However in a nutshell, the voltage readings from the sensors "switch" between zero and about 1.2 volts a few times every second.
Lean vs. rich is usually interpreted by the Long-Term Fuel Trim, which comes from data collected from the O2 sensors over time. In general, LTFT value in the negative range indicates rich running, while a value in the positive range indicates lean running.
Much debate usually ensues about the meaning of these readings and how they relate to the health and well-being of the engine.
My two AJ16s seem to settle into the range of -3.1 to -3.9, according to my generic scan tool.
Others here might provide more insight...
A discussion about interpreting O2 sensor readings might not be a quick one!
However in a nutshell, the voltage readings from the sensors "switch" between zero and about 1.2 volts a few times every second.
Lean vs. rich is usually interpreted by the Long-Term Fuel Trim, which comes from data collected from the O2 sensors over time. In general, LTFT value in the negative range indicates rich running, while a value in the positive range indicates lean running.
Much debate usually ensues about the meaning of these readings and how they relate to the health and well-being of the engine.
My two AJ16s seem to settle into the range of -3.1 to -3.9, according to my generic scan tool.
Others here might provide more insight...
#4
#5
It's probably going open-loop. You can't trim the fuelling if you aren't listening to the lambda sensor so it makes sense for the ECU to report zero.
There is a PID for open/closed loop - at least, I can see it on my Scangauge II.
Edit: I use the PIDs from http://www.scangauge.com/support/x-g...-vpw-vehicles/
There is a PID for open/closed loop - at least, I can see it on my Scangauge II.
Edit: I use the PIDs from http://www.scangauge.com/support/x-g...-vpw-vehicles/
The following users liked this post:
Ziggy (09-09-2013)
#6
It's probably going open-loop. You can't trim the fuelling if you aren't listening to the lambda sensor so it makes sense for the ECU to report zero.
There is a PID for open/closed loop - at least, I can see it on my Scangauge II.
Edit: I use the PIDs from XGauges for ISO & VPW Vehicles : Linear Logic : Home of the ScanGauge
There is a PID for open/closed loop - at least, I can see it on my Scangauge II.
Edit: I use the PIDs from XGauges for ISO & VPW Vehicles : Linear Logic : Home of the ScanGauge
Thanks for the link!
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