WS2 Flash Codes

Toyota

Flash Codes finding faults from the vehicle
Firstly teachers come to the engine and did somthing on it
Then our chance to find the faulty on the dashboard . i found the faults of the water temperature and ashowin up it was flashing on the dash board for like three times . when the teacher did like unplug the wiers then we add the jumpe wire on the code and we looked the manfucator spefiecation n found the number for each codes,

i was lookin around the where the fualts were. one of the connection was loosed when the teacher was doing somthing while we were looking other side if we looked at the teacher doing somthing that means it cheating i wont able to learn if icheat.
I Find the plug of the TPS and MAF was unpluged so i plug it bk then it fash around twice and started to work when the ingiton was on. how did i clear the code by disconnect the ingiton for 30 seconds then turn the power on. how to find the faults it wil show on the dash board or u can see somthing wrong with the engine so somtimes it wil show on the dashborad flasing or light on.The other test to check everyting it working well and make sure no light on n flashing and make sure the engine opearting well.