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From what I know, some O2 sensors works on 0.7-3v? with a working current of 0-416uA.
So, if you can build a circuit that can put out those parameters your ECM will think you have a real O2 sensor.
The circuit I built does not replace the 02 sensor. When 12v power is applied to the circuit it switches the output from the sensor to ground with a relay, then sends 1.6v @ 6uA-415uA (Adjustable by potentiometer) in place of the 02 signal through the same relay.
I used diodes to supply the 1.6v. It might have been better to use an op-amp voltage regulator so that the output voltage remains factory for every application.
Note: I doubt all o2 sensors operate within the same specs. Know the specs of the unit you are working with, or know the range of all applicable values so you can select different values via switch.
Reguards - TT
Wiki User
∙ 15y ago
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