[kevinjohnson3216]

Minimum & Max o2 and maf voltages?

Vg33e

What is the minimum and maximum output voltages for the primary o2 sensors?

What is the minimum and maximum output voltages for the MAF sensor?

Thanks

 

[smj999smj]

Front oxygen sensors:

0-volts (lean) to 1-volt (rich).
At 2000 RPM (engine at normal operating temperature), specification is 0-0.3v on the low side and 0.6-1.0v on the high side, with lean-to-rich cycling changing more than 5x in 10 secs. The oxygen sensor, itself, generates the voltage. The ECM has an internal fail-safe for the oxygen sensors; if it doesn't read a voltage from the sensor, it faults to an internal 0.33 volts for a reference.


MAFS:

This is a little different in operation. Technically, the answer would be minimum voltage of "less than 1-volt" and maximum voltage of up to 5v. The sensor is fed battery voltage and sends a signal voltage to the ECM. Specifications call for (with engine warmed up and running) 1.0-1.7v @ idle and 1.7-2.3v @ 2500 RPM. It would be less than 1.0v with key "on" engine "off" and approx. 4 volts @ 4000 RPM.

 

[kevinjohnson3216]

Thanks smj.