Chim 4.0 MAF

[kelvinwannell]

Can anyone tell me how to test my MAF with a multimeter? I now think this is my problem. Thanks for your help guys.

[Belle427]

Info here
http://g33.co.uk/pages/technical-fuel-injection.ht...

[Polly Grigora]

https://www.actproducts.co.uk/2011/lucas-14cux-fue...

[blitzracing]

The important bit is the standby voltage with no airflow as it settles to after the initial warm up spike. It should settle to 0.3-0.34 volts between the negative red/black wire (sensor ground), and the positive blue/green wire (Airflow signal). Any significant deviance from this voltage throws the voltage out over the whole airflow range. Full load tests are difficult to say the least.

[kelvinwannell]

Hi again

After trying this test, there is no voltage at all coming through. Also rover gauge shows 99%, which I believe should be 30% to 35%, is it most likely my MAF is dead?

thanks in advance.

[blitzracing]

kelvinwannell said:

Hi again

After trying this test, there is no voltage at all coming through. Also rover gauge shows 99%, which I believe should be 30% to 35%, is it most likely my MAF is dead?

thanks in advance.

Thats the wrong way around ? RoverGauge will show 100% if the output is stuck at 5 volts (never seen this)- 1.6 to 1.7 volts is your 30% plus range with the car at idle. To test the standby voltage on the AFM in RoverGauge you can try just touching the starter for a moment but dont actually start. This kicks the ECU into reading the AFM and it should read about 6% on direct.

Edited by blitzracing on Thursday 11th August 16:54

[blitzracing]

BTW- dont use car earth for readings- you must measure across the wire pins in the connector as the ground sides are not connected between ECU sensors and chassis.