Oh! Sorry I just got out from hospital ;-(
The reason we though about ECM because my friend car have the problem with code P171 he replaced oxigen sensors, Injectors... but the check engine light went off after reset but then on again with same code...when I test withODBII in Monitor mode( I.M ) it showed Catalystic, Oxigen sensors, EVap not ready when i test on all other car it showed everything ready and we don't know why it has no communication so we think of ECM messup...If any expert in here can help we are really appreciated...
Here how it show on the screen of OBDII
Misfire Ready
Fuel Sys Ready
Comprehens Ready
Catalyst Not Ready
Evap Sys Not ready
O2 Sensor Not ready
HO2 Sensor Not ready