Above are the information we could obtain from this vehicle .
Fault codes :
I checked on the scan tool but there were no fault codes recorded .
after lecturer intoduced the faults :
1st: turn on the car and check for fault codes 100 MAF , 110 IAT this will indicate the area .
2nd: turn on the vehicle and now compare the reading with the previous reading which we did earlier ... IAT was 25.46 deg/C and now 19.85 deg/C . MAF was 1.87 V and now 0 Volts
3rd: visual check the sensors and wires and noticed MAF and IAT sensor plug was not plugged in properly
4th: Repaired the fault by connecting the plugs properly and clear the fault codes using the function on the scan tool .
5th: Recheck the live data to make sure they are back to normal IAT 25.46 deg/C and MAF 1.87 Volts .
6th: recheck the system for any faults and none were recorded .
Live data is a very important, usefull also easiest ways to diagnosis a problem specially if there is no fault codes recorded . It is a good way to check the performance of the vehicle under different conditions where some faults could be hiding in ...
Parameters are as important as the live data because how would you know if this data you are getting is within the manufacturer specs (normal) ??? you'll have to compare the live data with the parameters to make sure that they are within the parameteres that is concidered normal for this vehicle .
Scan tool can aid us to check the live data against the parameters and point us in the direction we need to be looking ... it might not pin point where the problem is but its a good start for direction and even if the sensor is faulty after checking the circuit for bad connections , bad earth ... by comparing the live reading against the parameters
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