I do not have a supply voltage to MAF sensor

Good morning,

The brown/pink wire is the one that supplies 12 volts to the sensor. It is controlled by a fuse. I attached the diagram for you of the wiring.

The other 4 go to the ECM for the controls.

https://www.2carpros.com/articles/how-to-check-wiring

Roy

So I should have continuity between fuse 2 and MAF sensor. Note MAF sensor only has 3 wires.

TIA
George

Correct. The power comes from the fuse as in the diagram.

Can I have the complete VIN if you have a 3 wire sensor?

Roy

I have never seen a MAF with 3 wires? Can you double check the engine size 2.5?

Seems to be standard on the discovery 2.

Could you please post the VIN number for me?

Roy

See photo.

Thank you.

This is a turbo diesel. I will need some time to track down the information.

Roy

Yeh Td5.
What problems would a faulty MAF sensor give?
The understanding I have pin.
1 ground.
3 live feed.
2 signal return. (Vary between 1 and 5 volt)
Now have live feed, bur nothing on pin2 and no air flow on obd reader.

Okay, there should be a 5-volt reference voltage supplied by the ECM. There will be a return or ground going back to the ECM as well. The third wire is the signal wire. That will have 5 volts as well and will vary in voltage from 0 to 5 volts depending on engine load. As you accelerate the voltage should change on the signal wire. If it does not, then you either have a bad sensor or a broken wire.

Roy

Thanks Roy. Got 12v (supply) but nothing on signal wire. I have pinned the back of sensor so even with a damaged signal wire I should still get something?

That is correct. It comes from the ECM to the sensor.

Roy

Is signal not from sensor to ECU.

No, the ECM sends a signal voltage, then the sensor will drop or rise that voltage depending on the amount of air going through the sensor.

Roy