SCAN TOOL DIAGNOSTICS

THEORY

The scan tool is a hand-held computer that is used for interrogating the electronic control system through the data link connector.

PROCESS

·       I took my car for the scanning.

·       Connect the scanner, power it on, follow the instructions and input the correct vehicle information it asks for so you can view the data.

·       Then take the readings as listed in the following table:-

Type of information (PID = Parameter Identification)	Letters to describe it E.g. TPS	Value of data	Units for data E.g. volts
Engine Load (how much air comes in)	Intake	15%	Percentage
Engine RPM	RPM	725	Revolutions per minute
Throttle angle	TPS	0.96v	Voltage
Engine coolant temperature	ECT	33°C	Degree Celsius
Intake air temperature	IAT	3.73
Fuel Injection opening pulse	FIOP	4.71	Ms
Transmission select position	-
Vehicle Speed	-	0	KM/H
Oxygen sensor(s)	O2	0.10-0.70v	Voltage
Fuel Trim	-
Idle control	IAC	43%	Percentage
Power steering Load		0.02v	Voltage
Air conditioning condition	AC	3.91	Voltage
Exhaust Gas Recirculation (EGR)
Fuel Evap or Purge condition
Malfunction Indicator Light (MIL)
Barometric Pressure		78	Hz

·       Then I found where the codes were listed

·       There were no faults as such in the car

·       Then my lecturer created some faults in the car

·       Then I did the scan again and found the following faults

ode number	System affected	Condition described
PO113	Intake Air temp	High Input
PO100	MAP	High Input
PO122	TPS	Low Input

·       Record the PIDs that have changed below:

Type of information (PID = Parameter Identification)	Letters to describe it	Value of data	Units for data
Throttle Position Sensor	TPS	0v	Volts
Intake Air Temp	IAC	15°C	4.98

·       Then I looked under the bonnet and saw the faults that were created by the lecturer. Then I got them back in the right place and then cleared the codes from the car and then did the scan test again and found that it showed no problem at all in the car.