Mercedes w203 Mass Air Flow sensor - How to Test it - c200 2002

[@gusvlachos]

My friend in your very nice post there are few mistakes according to Mercedes DAS & my personal on board checks on a W203 C200 kompressor, 2000cc with DAS diagnostic. a) #1 pin is Ground for IAT and NOT MAF sensor, #2 pin is Power supply 12v, #3 pin is the MAF sensor, #4 pin is Power Ground, # 5 IAT sensor, all other are Ok.. b) IAT sensor #5 must NOT decrease as revs go up (!!?!!), instead must be steady approx. 2.5 - 2.8 volt (or 6060 Ω) at 20 degrees C. at IDLE, and as inlet air temperature rises, slowly volts (or ohms) must going down to 1.1 - 1.3 volt (or 1760 Ω) at approx. 60 degrees C.They can use a hair dryer to check it, thus to prevent misleading your followers. With respect to your post, Gus Vlachos

[@abs-gameplay6587]

What is the mass air rate grame per second at idel and cold start ?

[@ELdanizz]

Hi. What pin do you connect the plus and minus leads of the multimeter to to the maf sensor? (Pin 1 2 3 4 5?) Please write

[@kaarthikkannan]

Seeking your advice for M271 engine. to run the engine permanently lean mode to save more fuel and we don't want power due to road traffic. What supposed to do in MAF sensor to get more and more fuel ⛽ efficiency 🙏 thank you in advance

[@w3sky93]

Hello, give me an idea for help, I changed spark plugs and coils and every time when it is below 10 degrees for 1 minute it breaks on a cold start, then there are no problems until the next day! otherwise, in general, the car runs well and it's fine, but this morning annoys me a lot, I changed the throttle and it's not from him either!

[@prenomnom6642]

Look at the water temperature censor.

[@w3sky93]

@@prenomnom6642 it was changed and he is still the same…

[@edward3105]

Hi man! When you checked the IAT sendeo with the engine on,how you placed the probes,you didn't showed. Red to which pin and black to witch,tell me the numbers.

[@GuadalupeOrtiz2926]

Muchas gracias es muy interesante,tengo un detalle el mercedes q veo tengo en la alimentacion de 12v. Llega menos de 5v.viene de la ecu y tanvien esa señal lo reparte al map y al sensor de Oxigeno y a una valvula de carga y el carro normal enciende pero se consume mucha gasolina no estoy seguro si debe salir 12 v de la ecu ayudeme porfa

[@SLTHIS]

A have same problem. But sensor is new ! How to get an earring to maf sensor ???

[@buscoclanlatinol2494]

Hi friend , getting from 3.40 to 3.60 g\s at a very cold day is a good reading? 2001 w203 c200k

[@whlawson5812]

MAF should not be less than 4.5g/second at 0.5barg manifold intake pressure unless there is slight vacuum leak after throttle valve body of very slight crack in hoses along PCV valve. In early morning dip for engine oil level. Then start engine and switch on air cond. Keep engine running. After 2 minutes dip again for engine oil level with the engine still running. Oil level should drop by 20mm. If oil level increases more than 10mm then consider high blowby by your pistons. This would be the case if your PCV and hoses is still good.

[@mainrig4981]

aftermarket cheap maf sensors do not have temperature sensor.is an issuee if i buy one?it will be good?

[@GuadalupeOrtiz2926]

Me olvidaba la meche q no llega 12v.es C230 M111 del 2001 de 5 pines al plush del MAF

[@SuperKhachen]

Can you show me how to change MB w203 M271 please.

[@enriqueorihuela8717]

Hola maestro muchas gracias,tengo mercedes c230 M111 del 2001 en el MAF en el pin 2 esta llegando menos de 5 v. De la ecu no estoi seguro con ese voltaje el vehiculo cosume demasiado combustible ud dice q a ese pin (2 ) debe llegar 12v ese sera mi problema porq esa señal no viene de fusible. Porfa

[@jonasmartins500]

hello, if you can give me a tip, my car the flow of the maf sensor is between 2.5 and 4.2 g s, at 750 rpm stopped, is this normal? thanks!

[@doit_vehicles]

No , it should be a lot more steady and direct proportional with rpms

[@Afrikaansoldies]

Do you know what the reading of the MAF should be at idle in grams per second? I'm getting 2.3-2.4 g/s at idle when car is warm. But it sometimes drops to 1.8 g/s. I'm using an OBD scan tool with Torque Pro to monitor these readings.

[@doit_vehicles]

it should be around 4 grams at 750 RPMs . It looks like a dirty MAF sensor

[@whlawson5812]

During engine idling at 750rpm my MAF is reading at 4.6g/second at 0.5bar intake manifold pressure vs 5.7g/second by theoretical calculation. 750rpm/2/60 x 1.8litre engine x air density of 0.506g/litre at 0.5barg = 5.7g/second. Pressure in each cylinder at DBC, during end of intake stroke, should be a bit lower than the manifold intake pressure of 0.5barg. It is possible to be as low as 0.4 to 0.45barg when each piston is at BDC. This would account for MAF reading not getting to 5.7g/second. Further more blowby flow coming from PCV is not measured by the MAF sensor.

[@kaarthikkannan]

Hello dear friend, FOR TESTING ONLY, what happens if I connect the additional MAF sensor to connector and fully closed IN and OUT without removing existing MAF sensor from the intake. Looking forwarded your replay Thanks Karthikkannan

[@doit_vehicles]

The engine will get a noticeable idle change and depending on how the PCM is programed , it's gonna run the engine on default mode with preestablished values . It will obviously trow a code and it will also run rich most of the time during the change in rpm .

[@kaarthikkannan]

Seeking your advice to run the engine permanently lean mode to save more fuel and we don't want power due to road traffic. What supposed to do in MAF sensor. Thanks

[@AHMED63177]

Hello Sir, Please answer me, at idle (690~ RPM) I'm getting a MAF rate of 4.50 g/s or 14.3 kg/h in another scanner. The car is C230 2007 Mercedes V6. Do you think this is good?

[@whlawson5812]

4.5g/second by MAF at 750rpm at intake pressure of 0.5bar is likely a bit too low for a V6. Is it a 3 litre engine?. Nevertheless MAF should not be more than 9g/second even if it is a 3 litre engine sucking in air at 0.5barg at 750rpm. Connect your scanner into a similar car as yours to compare.

[@PlecakPN]

What could be the problem with my mercedes in 203 c180 petrol 2002? I drove home, turned off the engine. This morning it wouldn't start, I couldn't hear the fuel pump so I replaced it. The car still does not start, there was no pressure on the fuel rail, so I changed the fuel pressure regulator. The car still does not start. Do you have ideas what could be the problem?

[@gusvlachos]

Did you check pump's fuse (4th from the top in right) & pump's relay (on top), in the rear SAM ??!!

[@PlecakPN]

@@gusvlachos yes . Its ok there

[@gusvlachos]

@@PlecakPN Do you listen the pump ?, did you change the fuel filter with regulator ?, Is there fuel pressure now ? Must be at least 3.0 - 3.2 bars to start the engine, (proper value: 3.7 - 4.2 bars) . Do you have proper tools & skills for the checks ?, to guide you step by step to solve your problem. Inform me to plan next step, otherwise go to a MB specialized garage.

[@djroyalt3728]

hi, it would be nice if you could help me. I changed the air mass meter, but my car C200K M111.955 sometimes has speed fluctuations when it is stationary and it is sometimes a bit high. When I read the error, the error boost pressure too low came twice and mixture adaptation 1 was additive to fat sometimes the car has not the whole power but sometimes it has good power and i dont know what to do anymore😅 would be great if you have an Idea love youre Vids🙏

[@mainrig4981]

yup.i have 2.9 volts and when i hit the sensor i lose continuity : (((((..... if i unplug the plug the car still runs

[@ihtishamarshad9033]

Brother i have a w203 220cdi and i have also problem of egr , i watched some videos on KZbin and i have done the same job that you also did.But after 2 week i have got the same problem that egr is not working any more and the engine light in on also. And when i have done diagnosis it show the error P0404 , P2062, P2014. Can you please help me!!!

[@doit_vehicles]

Have you watched this : kzbin.info/www/bejne/hILEnKl9hMyWitE ?

[@doit_vehicles]

what did you noticed after the inspection ? is the egr valve moving , the selenoid getting power and so on ?

[@zorankrstev1220]

Hey mate i have question i have merc c220cdi 2008 old shape. Won't rev over 3000rpm any help or advice please. It's been on and off i have vhanged brand new air filter was fi e and then started again. Thank you very much appreciated.

[@doit_vehicles]

Any trouble codes ? Since it's a 2008 you can see some live data like the fuel pressure or check the egr valve

[@zorankrstev1220]

@@doit_vehicles im doing diagnostics on tuesday so will know thank you for your reply

[@MrChopemup]

Zoran Krstev any results.?

[@DisckjockeyF]

Hello, i followed your great video, and I found that my w203 C180k has the same MAF sensor (5 male pins), and the connector cable has also 5 holes BUT only 4 of them have copper connection, there is one (for the fifth Pin from left to rigth) that only carries a plastic hole, seems that there is no connection at all from that Hole, is that normal? (the cable doesn't seems damaged, i wonder if the design is correct for my car) someone helpme thank in advance

[@gusvlachos]

Yes this is normal for w203 C180K, #5 pin is for intake air temperature sensor (as it is on w203 c200k) and in your case this sensor is in a separate place from the MAF unit !

[@djerooooo9184]

Hi Buddy I need your help , I have trouble with my w203 c200 Komoressor it’s shows this on obd2 P0101 Mass or Volume Air Flow Circuit Range/Performance what it may be , I really need your help Thnx!!

[@doit_vehicles]

Hi . First thing check out if you get some response from the sensor on the live data under a variable ( rev up the engine ) . Have you done some test from this video ?

[@djerooooo9184]

doit_vehicles when engine idle shows 4,5 g/s its show things like this voltage e.t why this error come if maf works

[@emimari12]

I have a problem with my car. There was a problem with Air Flow. I bought a new im Internet, 2 hours the car was fast, now not. When the car is cold for 1 minute works not good, works a bit more like the Diesel engine 30 the latest sec that no fuel. This happened when I had interfaced the air Flow.

[@doit_vehicles]

Hi ! What was the problem with the MAF sensor at the beggining ?

[@darius2k192]

HI do you have a update for this problem ?

[@Emiljano-m7p]

Yes, I had to change the fuel filter.

[@persianchris2451]

Very useful

[@adstesting5740]

Hi, I thank you for this Video. I have changed my MAF this week et now I have a P0113 code, IAT. Can you tell me please where I can find it (I mean localise it on the Engine) ? If I need to buy a new? I have the same Engine of you. I Thank you.

[@doit_vehicles]

Hi ! Can you describe first the symptoms that made you change the MAF and what codes did you had before changing it ? The IAT sensor it's on the same unit as the MAF sensor as I mentioned in the video ... If you have the exact engine , you will find 6 wires connector on the MAF & IAT unit . You might have to check if you get any signal from the PCM on that 6 wires connector first ..

[@adstesting5740]

​@@doit_vehicles I thank you for your response. In 28/11/2018 I have seen this code P0101 and since this time my car loss power and when I lift my foot on the accelerator; the rev-counters goes down to 500 and goes up to 1000 and stays like that for a sevral seconds. In the last 3 weeks this behavior happens more than one time by day. In the last week, I have disconnected the MAF for 3 days and my car works good (without the symptoms). I have put the new MA in the last weekend and the code P0113 appears and I feel that my car is not good at all.

[@doit_vehicles]

First I am sorry to say but you probabily should not replace the MAF sensor . Try to do the test on the old MAF and clean the hot wires . The new MAF it sounds to me that it's not compatible with the car or you might have a short betwen the MAF unit connector and PCM - so test that . If you have a scan tool which shows you the values of the MAF and other data , the diagnostic process would be easier . Otherwise I can only guees it's a vacumm leak , a short or just dirty MAF sensor (the old one) and the new one is not compatible or defective(very rare) .

[@adstesting5740]

I thank you man and I will try. but the problem of the IAT appeared just after the disconnection of the old MAF and after the connection of the old MAF, the problem persists. I have buy the new MAF with OEN of found on the old. www.autodoc.co.uk/mapco/7074907 I have the scan tool and the IAT parameter is at 50.

[@salahhage7431]

I'm still having problem in my car

[@doit_vehicles]

What can I do for you ?

[@salahhage7431]

Okay limited you what happened what exactly happened I lost my range sensor the shifter and then I replace it everything is was was fine okay I drove the car smooth and easy the next day the try to start the car at 1 since that day the car is not cranking

[@salahhage7431]

I have a good battery I have good power everything but the car won't start and won't even click after I replace the shifter

[@doit_vehicles]

it might be because the computer thinks you are in D ( drive ) instead of (P) parking . you have to gather more data about the issue .

[@doit_vehicles]

what do you meen by " limited you " ?

[@GeorgeP10]

Like

[@александрвайнер-ь9р]

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