mazda capella wagon:
Trouble codes found were 100 & 110 MAF & IAT respectively. These components wern't working properly. Using the scan tool the codes that changed were IAT 19.85degrees & MAF 0volts. Using the scan tool information I did a visual inspection and found air flow cold box meter sensor not properly pluged in and MAF sensor plug was also not plugged in properly. To repair the fault I plugged both connector bak in and now working fine. (good readings).
Recheck Data:
IAT 25.46degrees & MAF 1.87volts
Clear codes: removed scan tool for a couple minutes then plugged it back up and searched for codes. No fault codes found.
The importance of live data is that you can get information about the can then and there when its operating. For example you might get an O2 reading of 0volts and you might thick thats ok but when you check live data itl stay O2 sensor open loop and the voltage should be .45v.
The need for parameters when checking live data is that all signals come in and are calculated then an outcome is made, if one signal was faulty it could be affecting another components so we have parameters so we can monitor an idividual component.
A scan tool can aid you when fault finding because its current data and its telling you exactly whats happening and the fault codes it gives is a good indication on what and where the fault might be. (always start from the battery)
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