284: ECM-980F Air flow. Faulty flow

[adriansimo]

Hello,

Error: 284: ECM-980F Air flow. Faulty flow.

Can you help me?

Thank you.

[VOLVOBOY]

Hi.
The ECM measures the amount that the throttle is open , ie. engine demand.
Then calculates a value that the MAF Sensor and MAP sensor should both read. If there is a too large a discrepancy between the two then this DTC is set.
It does not necessarily mean that one of the sensors is faulty , but that could be the case.
In the first instance you should carefully check all the induction pipework for splits , leaks or blockages.
Secondly , check the cables and connectors.

[adriansimo]

Hello,

I've checked but everything seems to be fine!

Engine stops when I press the brake pedal.

Can you assist me further?

Thank you.

[VOLVOBOY]

Hi.
OK. The next thing to look at is the Throttle Position Sensor on the throttle body. This could be at fault if not one of the previously mentioned.. This is a sealed unit. You now have the choice of opening it up carefully to see if it can be cleaned and repaired or just replacing it. There are guides on the internet if you search.
This and the MAP Sensor are the least expensive although in all likelihood it may turn out to be the MAF Sensor. This is where really good diagnostic kit is a godsend.
I`ve said all this based on just your first post. Now you`ve thrown something else into the mix. It may be a symptom of the above. It may be something entirely different now. Is there anything else going on that you`ve not mentioned ? Your info is very vague . When you say the engine stops when you apply the brake do you mean it cuts out (electrically ) or it stalls out ?

[adriansimo]

Hello,

Engine stalled out only when I drive car and I press brake pedal.

Strange is that Vida Dice does not show any faults any more.

Thank you.

[adriansimo]

I have deleted the errors last time when I've seen the error in first post.

[jgjones095]

As a guess try the one way valves on the vacumm lines.

[adriansimo]

Hello,

I put Vida Dice again and it shows air flow mass somewhere around 3g in idle, anyway a mechanic told me is way too little.
I pull out the cable from MAF sensor and now engine works fine but with check lamp on.

I will try to replace MAF sensor.

Thank you.

[VOLVOBOY]

Hi.
If replacing the MAF does not fix the problem and the engine still stalls out check the Brake Booster and EVAP system for leaks and the Crankcase Breather System for blockages.

[traebbe]

Originally Posted by adriansimo

Hello,

I put Vida Dice again and it shows air flow mass somewhere around 3g in idle, anyway a mechanic told me is way too little.
I pull out the cable from MAF sensor and now engine works fine but with check lamp on.

I will try to replace MAF sensor.

Thank you.

Hi,

had the same Error when the V70 was new to me.
I replaced the air Filter and all was fine.