MAF (Mass Air Flow) Sensor Location on Scenic 1.9 dci - Renault Forums :: Independent Renault forum

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post #1 of 4 (permalink) Old 20th November 2010 Thread Starter
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MAF (Mass Air Flow) Sensor Location on Scenic 1.9 dci

Hi

This is the first time I haven't found the answer to my question on this forum, so I've been forced into registering to ask it after 2 years of lurking. Just goes to show the wealth of info on here...

Anyhoo...

Renault Scenic 1.9 dci on a 52 plate. Diognosed as having a problem with the Air Mass Meter this morning.

Symptoms:

She loses power intermittently: sometimes just loses accelleration (usually up hill, but not always) but sometimes it's like hitting a brick wall, or at least a rev limiter. Dipping the clutch when it happens doesn't cause it to rev as you'd expect.

Doesn't matter if it's hot or just started, although more often than not, it's within the first 15 miles.

"Electronic warning" light comes on on the dash occassionally but not always.

As I said, Local Garage diagnosed it as requiring a new Air Mass Meter and quoted 253 +vat to replace. Seems abit steep to me so I'll be doing it myself, whether I know what I'm doing or not. Obviously, I want to know as much about what I'm doing as poss before I start.

Problem is, I can't find the damn thing, so I can't find a part number/ oem number to order a new one. I assume it'll be connected to the air box somewhere.

Any help would be massively appreciated: locations, directions, instructions, photos, videos, come round n do it for me. Whatever you can do, I'd be very grateful for.

Cheers

Andy
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MAF (Mass Air Flow) Sensor Location on Scenic 1.9... Exhausts dsom73 3 18294 20th November 2010 04:32 PM
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post #2 of 4 (permalink) Old 20th November 2010
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Re: MAF (Mass Air Flow) Sensor Location on Scenic 1.9 dci

I have seen numerous code readers come up with MAF faults and it turned out not to be the case - this occurs in around 70% of cases. As Renault use a different protocol in their ECU's not all code readers are compatible.
So be careful before spending your hard earned cash.

The MAF sensor is usually located close to the air filter - see attached photo for a sample unit - it may help you identity it. Before removing the MAF try disconnecting its multi-plug and see how the car runs. Disconnecting forces the ECU into default mode so overiding many sensors. Sadly this method of testing is no guarantee the MAF unit is faulty but it may help nail down the likley problem. Try disconnecting and come back to us. It is rare for MAF units to have intermittent faults - when they go they usually don't recover.

I take it the EGR valve has had a good cleaning and checked if operating correctly.
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post #3 of 4 (permalink) Old 20th November 2010
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Re: MAF (Mass Air Flow) Sensor Location on Scenic 1.9 dci

Have a look here,it's concerning a similar fault and shows an engine bay layout on a similar aged Megane.....

Reanult Scenic DCi - loss of power

I'm pretty sure the MAF sensor is down the back of the engine.
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post #4 of 4 (permalink) Old 20th November 2010 Thread Starter
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Re: MAF (Mass Air Flow) Sensor Location on Scenic 1.9 dci

Crikey, wasn't expecting a reply so quickly, especially on a saturday night. You guys must live n breathe this stuff, I'm obviously in the right place

It's funny you should both mention the EGR valve actually. When I searched these forums a couple of weeks ago, my symptoms pointed me towards either a knackered fuel filter or a clogged EGR valve. Someone said both might as well be looked at so I fitted a new fuel filter and priced up a new egr valve.

The guy at the trade counter suggested I try this spray stuff to clean the egr valve out without having to take it off. Just remove the air filter and spray it in bursts while the engine's being revved. Maybe it didn't clean it as well as I'd hoped, if at all. Symptoms didn't disappear anyway.

Seems quite a straight forward job to take off and clean so I'll start there. Suppose I was just being lazy with that spray...

Cheers lads, I'll let you know how it goes.
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