If your catalytic converter or secondary O2 sensor(s) is not working
properly, the Engine Control Unit (ECU) will receive a bad signal
from
the sensor(s) and the Check Engine Light (CEL) will come on. As
federal laws become more strict, a car displaying a Check or Service
engine soon will fail any kind of emissions or inspections programs in
place by your state.
The first (primary) sensor is upstream from the converter and is used
by the onboard computer to calculate the air/fuel mixture. The second
(secondary) sensor is downstream from the converter and its only job is
to report if the converter is working properly. The CEL will come on if: a: The converter has been removed/gutted or needs to be replaced b: The sensor has been removed or is malfunctioning.
A simulator will solve both of those problems!
This O2
Simulator sends the exact signal to the ECU that the secondary O2
sensor does when all is working fine. This could save you hundreds of
dollars in repairs that would have to be done before you could pass
emissions.
Here is a SAMPLE of this simulator for a four wire
02 sensor: Here is
a "go-between" for a wiring harness install: BUILDING YOUR OWN:
We know that after the cats the mixture should be lean (because
the cats function is to burn up any excess fuel that the engine did
not) so all we have to do is make the Output Signal sense a low voltage
(under 300mv) reading and oscillate the reading to make it look like a
working o2 sensor. This can be done via the following that painfully
simple circuit!
