Ok what type of scanner are you using?
You've got me there. They were used by two different auto electritians and I've got no idea what kind they were.
Well i recommend you to tell the electricians to tests the OBDII conector to see if there are the voltage they need to use the scanner, other way is to use the Consult tool this is the original scanner for the nissan´s car´s, sometimes when the OBDII port doesn´t work, the consult tool works.
Now i guess the problem on your car is the TPS sensor, and also the MAP sensor, BUT i prefer to help you when you got the scanner readings.