240 air mass meter

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Beck - 25 Aug 2005 18:36 GMT

Have checked the diagnostic console and it is giving a code for an Air Mass
Meter problem. Looking in Haynes manual is difficult to know whether the
air mass meter is the whole of that large pipe or just a part of it as the
diagram is inconclusive.
Could it be that the whole pipe needs cleaning or something similar?
thanks.

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Tim McNamara - 26 Aug 2005 05:26 GMT

> Have checked the diagnostic console and it is giving a code for an
> Air Mass Meter problem. Looking in Haynes manual is difficult to
> know whether the air mass meter is the whole of that large pipe or
> just a part of it as the diagram is inconclusive.

The AMM is a unit about 6" long that has wires plugged into it, with
hose clamps on either side of it. There is the air intake box, a short
length of flex pipe, then the AMM, then more flex pipe leading to the
fuel injector unit. There is a 10 mm bolt holding the AMM onto the body
of the car. You also should replace the air box thermostat at the same
time as the AMM.

Replacing the AMM is about a 10 minute job. The air box thermostat is
kind of a pain in the tuchas.

Lots of info on the Web:

http://www.vlvworld.com/indexframe.html?200/Section_2_5.htm

http://www.vlvworld.com/indexframe.html?VolvoRepairManual/Section_2_5.htm

http://www.swedishbricks.net/faq/fiairmeter.html

http://www.fcpgroton.com/volvo240b23fuelinjection.htm

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Beck - 26 Aug 2005 11:45 GMT

>> Have checked the diagnostic console and it is giving a code for an
>> Air Mass Meter problem. Looking in Haynes manual is difficult to
[quoted text clipped - 20 lines]
>
> http://www.fcpgroton.com/volvo240b23fuelinjection.htm

Thanks for your help. We are going to give it a clean first and see if that
is the problem. No point in paying for it to be replaced if it just needs
cleaning. I know the bit you mean though, not the pipe itself, but the box
in the middle.
Its possible its also a rogue code that has flashed up for no reason. My
dad unplugged the car battery and replaced it again and the code has not
come back on again today. Its going in for an MOT today gawd knows what they
are going to find, we got conned by the salesman. Lets hope any fixes are
minor.

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Robert Lutwak - 27 Aug 2005 20:07 GMT

You can test the air mass meter in place with an ohmeter. I believe your
Haynes manual will tell you which pins to connect to and what to expect.

In my experience, the AMM sensor code is probably not the AMM but an air
leak in the big plsatic tube. Check it carefully, particularly in the ribs.
A replacement tube is about $25, AMM is probably $350.

-----

-RL

> Have checked the diagnostic console and it is giving a code for an Air
> Mass Meter problem. Looking in Haynes manual is difficult to know whether
> the air mass meter is the whole of that large pipe or just a part of it as
> the diagram is inconclusive.
> Could it be that the whole pipe needs cleaning or something similar?
> thanks.

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Tim McNamara - 28 Aug 2005 21:55 GMT

> You can test the air mass meter in place with an ohmeter. I believe
> your Haynes manual will tell you which pins to connect to and what to
[quoted text clipped - 3 lines]
> air leak in the big plsatic tube. Check it carefully, particularly
> in the ribs. A replacement tube is about $25, AMM is probably $350.

Especially the duct between the AMM and the injection system. Air
getting in there will cause problems for sure.

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