Please stop calling it pin 4..there is NO pin 4 ..it is the DM.
And NO, the DM will not flash 1 like the PIN ONES do until the DM does a complete Emmissions self test.
Go here.
E320 16 PIN DTC Charts inc. pin 8, pin 14
I believe you could have a bad MAF sensor , bad wiring harness to it, or a bad feed from the OVP. You do not have the equipment to test these, so you may want someone to look at it or you may want to chance the OVP, although my first suspect with those codes would be the MAF sensor or wire harness..Archieve search it..sometimes the MAF can be cleaned and you can cut open the harness and take a peak. Harness short is suspect b/c you are getting immediate codes. While it is running, flex the harness and see if engine changes.