ChinaRiders Forums - View Single Post - Working With Diagnostic Data Cable & Software

katflap · 05-16-2016, 12:15 PM

Hi peter,

my best guess is that we are using the narrowband O2 sensor.

Apparently a wideband sensor has 5 or more wires, ours only has 4.

Not a very technical answer but all I have at the moment.

I didn't realize they were so expensive

I had another look over the recording, I decided to ignore the "AFR TARGET" &" AFR COMMAND" readings and focus on the "O2 RICH" indicator and the O2 voltage".
Assuming that an O2 voltage of 450mv is equivalent to an AFR of 14.6:1

and indeed it did appear to be running at this AFR for most of my trip, with the "O2 RICH" indicator alternating between rich and lean equally. Convincing me more that the EFI is held in closed loop more than originally thought.

It was also clear that when it entered "POWER ENRICHMENT MODE" at about 75% throttle opening, it was definitely in open loop.

05-16-2016, 12:15 PM	#133
katflap Join Date: Jan 2015 Location: England Posts: 382	Hi peter, my best guess is that we are using the narrowband O2 sensor. Apparently a wideband sensor has 5 or more wires, ours only has 4. Not a very technical answer but all I have at the moment. I didn't realize they were so expensive I had another look over the recording, I decided to ignore the "AFR TARGET" &" AFR COMMAND" readings and focus on the "O2 RICH" indicator and the O2 voltage". Assuming that an O2 voltage of 450mv is equivalent to an AFR of 14.6:1 and indeed it did appear to be running at this AFR for most of my trip, with the "O2 RICH" indicator alternating between rich and lean equally. Convincing me more that the EFI is held in closed loop more than originally thought. It was also clear that when it entered "POWER ENRICHMENT MODE" at about 75% throttle opening, it was definitely in open loop.
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