scan tool diagnostics

We did this on the 1zz engines.We were given a scan tool.

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first I had to know what the folowing means

Type of information(PID=Parameter Identification)	Letters to describe it	Value of data	Units for data
Engine Load(how much air comes in)	AFM(MAF)	2.58	Gm/s
Engine RPM	Engine speed	700	RPM
Throttle angle	Throttle position	11	%
Engine coolant temperature	Coolant temperature	71	C
Intake air temperature	Intake air temperature	22	C
Fuel Injection opening pulse	Injector pulse width	2.7	ms
Transmission select position	shift	4
Vehicle speed	0	0	Km/h
Oxygen sensor(s)	O2 sensor B1 S1	0.89	V
Fuel Trim	Short fuel trim#1	-20.3	%
Idle control	IAC duty ratio	37.5	%
Power steering condition	PS	off
Air Conditioning condition	A/C cut signal	on
Exhaust Gas Recirculation(EGR)	-	-	-
Fuel Evap or Purge condition	EVAP VCV	OFF	-
Malfunction Indicator Light	Warning light/MIL	on	on
I got this information from http://ttec4826-vlad.blogspot.com/2011/05/scan-tool-diagnosatics.html

I plug the scantool in to the diagnostic plug the I got the lecturer to create a fault.He did this and after selecting the vehicle and engine on the scantool the fault code came up.The code number was po120 I looked it up and found that it was the tps.The lecturer switched this of.By doing this he had caused a circuit malfunction.After this I had to find out what parameter identification of system voltage(pid)has changed. the type of informayion is throttle position letters to describe this is tps value of data is 0 units for data is % I did this with ignition on.I did a visual inspection to find the fault.To do this I checked for corotion,I checked plugs to make sure they are in properly.I checked all the wires and chech yhe voltage.I found that there was a circuit malfunction and when i could not repair it I got lecturer to turn back on.On the tps the yellow wire is the 5v supply the brown is the reference and the green is the signal wire.To clear the codes I said clear codes on scantoolI turned the ignition of. to recheck the codes I turned ignition on again and no codes came up.Live data is important because it shows faults and changes in the system and what is happening with the faults in the system.parameters is needed when checking live data because it shows changes and what is hapening in the system.A scan tool can aid you when fault finding because it is acurate and tels you what is wrong to be able to fix the car faster.