08-10-2015, 09:42 AM
bad earths could cause all types of faults on a ECU controlled engine,
as most of the sensors rely on a stable 5v reference to earth, if the earth is bad the signal from the sensors will fluctuate and the ecu will over compensate,
or if the sensor reading is outside its range/tolerance set buy map values,the ECU will flag a EML light if programed too.
that is why cleaning up the earth's on these engines is always a good starting point, before you start in depth diagnosis
as most of the sensors rely on a stable 5v reference to earth, if the earth is bad the signal from the sensors will fluctuate and the ecu will over compensate,
or if the sensor reading is outside its range/tolerance set buy map values,the ECU will flag a EML light if programed too.
that is why cleaning up the earth's on these engines is always a good starting point, before you start in depth diagnosis
https://www.check-mot.service.gov.uk/
GTI6 Info
Don’t drive faster than your guardian angel can fly.