em light on corsa b 1.2 16v ecotec

[corsabus 1]

Hi got a wee fault with the girls corsa b 1.2 16v ecotec, em light on put my code reader on it and getting a code up for the air flow meter, replaced with another good non one cleared the codes and still the same any ideas? any thing comon? cheers del (i am a mechanic so sensible comments lol)

[Vinci]

What does the code exactly say? Usually it's something like voltage too low or high....

Further the engine is running fine?

[Vinci]

What does the code exactly say? Usually it's something like voltage too low or high....

Further the engine is running fine?

Some tests:

Tests with the MAF sensor plugged up:

-With ignition on you need to measure aprox. 5V between pin 3 and 5 on the plug.

-With the engine idling this goes down to roughly 1,5V

-With accelerating briefly it should read 4,2V

Check earth connection:

-Zero ohms between pin 3 and earth

Check voltages:

-2 & earth battery voltage

-4 & earth 5V aprox.


Wire colours:

pin1 Blue
pin2 Red/Blue
pin3 Brown
pin4 Red/Black
pin5 Green

Good luck!