I bought the scan tool actron 9185 I have a 015 code and quad driver 1,2,4 are bad plz help what are the quad drivers

 

oh its a 94 3.4 lt

 

I am going off of 23 year old memory but the quad drive is the part of the PCM and can drive something like an injector. It is like a relay on a much smaller scale. Quad drivers can fail (bad PCM) or if the thing it is driving is drawing to much power it can show a bad quad driver but the quad will come around once the circuit is fixed.

While this can mean just a bad PCM it is a warning to the tech he needs to check that circuit because if the quad drivers failed because of something is drawing too much power the new PCM could fry the second you plug it in. Hopefull someone will look it up.