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Technical MAF Sensor

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Technical MAF Sensor

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Gimba

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Ive read to test a MAF sensor, you turn the car on and disconnect the MAF sensor, and if the car stalls/goes to limp mode that means the sensor is fine, but if the car carries on as normal when the MAF is disconnected that means the MAF sensor is bad, how true is this specially for our Puntos?

There are plenty posts and youtube videos about this, but i'm wondering if for us it might not be necessary true
 

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That is not a MAF, that is a MAP.

This is a MAP

That is not always true.
The sensor could fail but not in all the range.. it could read gradually wrong.. as the pressure (throttle) varies.
The best way to test is is using MES .. see it on a graph
 
aurick86 said:
That is not a MAF, that is a MAP.

This is a MAP

That is not always true.
The sensor could fail but not in all the range.. it could read gradually wrong.. as the pressure (throttle) varies.
The best way to test is is using MES .. see it on a graph
Click to expand...

Erm, yes it is. What Gimba has referred to and pictured is indeed a MAF. It monitors airflow. MAP wasn't mentioned.

Gimba, If you disconnect it while the engine is running, it will indeed stop the engine running and illuminate the engine management light on the dash.

If you disconnect it BEFORE turning on the ignition, the ECU should be able to run the engine, but with limited power.


Incidentally, you will only find a MAF in a diesel Grande Punto, So if you have a petrol engine, then you won't find one ;)
 
:eek: Need to get my glasses checked... i was sure he was talking about a 1.2 GP.

But what i said is still relevant.
 
brickfoot said:
Erm, yes it is. What Gimba has referred to and pictured is indeed a MAF. It monitors airflow. MAP wasn't mentioned.

Gimba, If you disconnect it while the engine is running, it will indeed stop the engine running and illuminate the engine management light on the dash.

If you disconnect it BEFORE turning on the ignition, the ECU should be able to run the engine, but with limited power.


Incidentally, you will only find a MAF in a diesel Grande Punto, So if you have a petrol engine, then you won't find one ;)
Click to expand...

aHH, SOOOOOO ... I unplugged the sensor whilst the engine is on, and nothing changed, didnt cut out, didnt show an engine error, would that mean the MAF is bad?, if ya know?
 
Gimba said:
aHH, SOOOOOO ... I unplugged the sensor whilst the engine is on, and nothing changed, didnt cut out, didnt show an engine error, would that mean the MAF is bad?, if ya know?
Click to expand...

Could mean one of 2 things.

Faulty connector, or faulty MAF. I'd say go for a drive with the MAF disconnected, and if there is no difference, then you almost certainly have a faulty sensor.

Only way to tell for sure is to either...
Plug in a diagnostic such as MES and see if you get a reading from the MAF
OR
If you happen to have a spare MAF, plug that in and see if there is any noticable improvement.
 
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