Code 93 in Corsa MPFI

I have a Chevrolet Corsa in the workshop, with GMMultec MPFI injection, I had a failure that would be more or less like that.
Regulated (in idle) as in 3 cylinders and when accelerating black smoke by the escape.
Clean injectors, and change the empty hose of the MAP (punctured), then proceeded to "scan" the ECU (with SPC960) delete a series of faults, (apparently old) and perform the test of actuators and restart everything, delete all the failures and put it in progress.
The car feels good, the march is a couple and not long smoke, replenishes with agility and everything.
But I start a fault code that is "93-Exit quadrup (UM) (U8)"
so I could find out is a failure in one of the Driver of the ECU (U8), but which can also be attributed to an electrical failure in the ignition coil or its circuit.
Can anyone give me something else about this fault?
Thank you.
Juan Meoniz

Hello Juan, I tell you that I was reneging with a corsita that had the same fault.
That code can indicate the following failures: Board failure light, canister purge valve, coil circuit.
In my case, the car made current cuts when the engine reached working temperature, and regulated very badly in idle.
I was lucky to have a friend of a friend, so I started changing the canister valve, but the fault continued. What I did later was to control the coil wiring.
When I did that control I gave myself that the cables were very dry for temperature, so I changed them from the ECU to the coil, with a file included, and the problem was solved.
I hope it serves you info, greetings

Thank you very much, for the fact, the funny thing is that you the car failed, in this case after doing what I said works perfect until today, but the code is still present.
It is the most weird.

Hello, because if it does not present a fault, the code can be presented by the fault witness signal. If you want, you tell me which engine number and sent you the electric diagram ....

Ok, it may be that the failure is of the canister valve; If it does not work, the only problem it causes is a smell of fuel.
It can also be the witness light of the board