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Discussion Starter · #1 · (Edited)
I read some info from this forum as well as from Bosch's site.

I know that the wideband O2 sensor needs a data logger to
tune the ECM. But what indeed is the wideband O2 trying to tune?
The narrowband O2 sensor generate a voltage signal to the ECM,
so the ECM adjust the injector pulse width in a PID fashion to
drive it back to 450mV, which suggests a 14.7 air/fuel ratio.

The wideband connector has 5 or 6 wires, so it cannot be directly
plugged into the original female connector in the car, then how can
the ECM read the O2 content in exhaust gas? I 'm confused.
 

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Discussion Starter · #2 ·
Is the tuning process trying to calibrate the MAF sensor?

QUOTE=chenripp;1623884]I read some info from this forum as well as from Bosch's site.

I know that the wideband O2 sensor needs a data logger to
tune the ECM. But what indeed is the wideband O2 trying to tune?
The narrowband O2 sensor generate a voltage signal to the ECM,
so the ECM adjust the injector pulse width in a PID fashion to
drive it back to 450mV, which suggests a 14.7 air/fuel ratio.

The wideband connector has 5 or 6 wires, so it cannot be directly
plugged into the original female connector in the car, then how can
the ECM read the O2 content in exhaust gas? I 'm confused.[/QUOTE]
 
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