ronthenekred Posted March 23, 2013 Share Posted March 23, 2013 Is it possible to read from the cars ECU if any dash warning lights have previously been turned off? Link to comment Share on other sites More sharing options...
tallanddopey Posted March 23, 2013 Share Posted March 23, 2013 Im pretty sure its possible on proper diagnostic equipment, but im unsure if it can be done via laptop diagnostic software. Link to comment Share on other sites More sharing options...
Dardandec Posted March 23, 2013 Share Posted March 23, 2013 Usually freeze data is cleared when any dtc's (Diagnostic trouble codes) are cleared. Snap shots can be taken using diagnostic equipment but this is only stored on the equipment and needs to be set up to do so, but also will only register a fault if there is one when the test is being carried out. Also some engine ecu's can be reset which would also clear any freeze data. Freeze data only usually gives certain information like engine revs, coolant temperature and other parameters like that when a fault occurs. So I would say no it is probably not possible to retrieve this information if the fault code has been cleared. Link to comment Share on other sites More sharing options...
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