[icingdeath88]

Originally Posted by Huskymaniac

Here is some data. I captured the data with the Fluke Scopemeter shown. The plot is of 13 sequential time frames overlaid on each other. As you can see, the signal is low speed and quite repetative. It wouldn't be difficult to make a small circuit that would replicate this signal. Someone with an OBD2 car with a 5 speed swap could inject this signal into the appropriate pin on the TCU connector (the one that leads to Pin 80 on the ECU) an see if the CEL stays away after being cleared.

Ok, first, how would one go about "injecting" the signal into the ECU?

Second, do/can we know whether the signal that you read on the scope is enough to satisfy the ECU?

Let's keep the brainstorming going before momentum is lost.