Flash codes

This test was on car and the engine I used was a 4a-fe out of a 1992 toyota corolla.I was given a jumper wire with a fus to prevent blowing anything up.The tutor made some faults on my engine,I had to use the jumper wire in the diagnostic plug to try and find the fault.I used the manufacturers manual and found that I had to use my jumper wire between TE1 and E1 to get a code.The code apears on the dash as the engine light.If the engine light flashes 2times then stops and flashes 4times then the code is 24. In the manufacturers manual it has all the codes and what they mean.I was given 3 faults on my engine and found them.

code number                           system affected                        condition described
24                                           intake air temp                          effect air fuel ratio
31                                           vacuum sensor                         running real bad
41                                           tps                                           bad idle

After i found these faults i did a visual inspection on the engine at these sensors and found that all those sensors were unpluged so to repair these faults all I had to do was plug the plugs back in.To clear these codes you turn the ignition of and back on again.To recheck the codes i fixed the faults and reset the codes and it was clear.The faults I found can effect the performance of the car because with vacuum sensor wiil run rich and use more fuel and with the tps it will hav a flatspot and also with the iat but difrent more jerking type.after test are done just had to make sure are lights on dash are off