not sure how you get mass air flow codes on a MAP system....
Most codes like O2 codes or sensor codes are called "manufacturer" codes and will set pretty much as soon as you start or turn key on. Some O2 codes, like the heater relay codes will set after a certain time limit. If you have manufacturer codes, it wont go into closed loop and most emission codes only set in closed loop.
If you fix the VSS code and O2 heater relay code, it should go into closed loop at which point it will set another half dozen codes for no evap solenoid, large vacuum leak, small vacuum leak, batt temp sensor , etc. Then you will get O2 volts low codes due to no cat. A flash will fix several of these codes assuming you built the harness correctly.
