Alfa Romeo 146 2001 1.4-LITRE - Air mass meter circuit at faultArchived Message
Posted by EAMONN GREENE on March 7, 2005, 7:02 pm
THE AIR MASS METER (AIR MASS METER CIRCUIT)IS AT FAULT WITH THIS CAR.BUT THIS IS IT'S SECOND SPURIOUS AIR MASS METER WITHIN A FEW WEEKS. NOW THERE IS NO OUTPUT AT ALL ON THE SIGNAL WIRE OF THE AIR MASS METER. WHAT I WANT TO KNOW IS THIS; HOW DO I KNOW IF THE PROBLEM IS WITH THE ECU OR THE AIR MASS METER ITSELF. WITH THE CONNECTOR DISCONNECTED THERE IS NEITHER NEGITIVE OR POSITIVE VOLTAGE ON THE SIGNAL WIRE COMING FROM THE ECU. YET WHEN I TRIED THIS TEST ON TWO FORDS THERE WAS A NEGITIVE COMING FROM THE ECU WITH THE AIR MASS METER DISCONNECTED. IF I CUT THE SIGNAL WIRE (SOMEWHERE BETWEEN THE MAF AND ECU) SHOULD I GET A VOLTAGE FROM THE AIR MASS METER ITSELF , THAT IS IF IT IS WORKING. I'M AFRAID THE ECU IS CORRUPTING THIS SIGNAL FOR WHAT EVER REASON. THE OTHER WIRES ON THE AIR MASS METER ARE PERFECT WITH IT'S FIVE VOLT REFERENCE AND A GOOD EARTH. THANKS A LOT FOR YOUR TIME REGARDS EAMONN