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Old 12-04-2012, 02:03 PM
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Mass airflow problem

Hi, i have a 2008 grand cherokee crd, and i have a trouble with the mass airflow, the check engine is always on and give the code to de mass airflow, so i change dit to a new one, still not working. They checked the cable and there is 2 ohm on brown cable but its supose to be 10 ohm, they bypassed the cable from the computer to de mass airflow but the check engine came back quickly. One day of testing and we dont know whats wrong, he think it might be the computer. Anyone know whats wrong with my jeep ? it already cost me a lot of money and the problem is not solved. I need your help please.

And by the way, sorry if my english is bad, im french.


Thanks a lot.
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Old 12-05-2012, 08:02 AM
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Re: Mass airflow problem

the wiring goes back to the main ECU. The main ECU is underneath the battery tray. On some Jeeps, the battery leaks and acid will drip on to your ECU. Has your shop tried removing the battery and looking underneath the battery tray to see if battery acid has leaked on the ECU?
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Old 12-05-2012, 06:09 PM
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Re: Mass airflow problem

what is the error code ?
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Old 12-06-2012, 11:58 AM
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Re: Mass airflow problem

no battery leak, and the code is p0101. thanks a lot for helping me.
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Old 12-06-2012, 07:40 PM
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Re: Mass airflow problem

Could be caused by intake air leaks or even a dirty air intake filter.
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Old 12-07-2012, 11:08 AM
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Re: Mass airflow problem

Quote:
Originally Posted by Frango100 View Post
Could be caused by intake air leaks or even a dirty air intake filter.
i asked them and they checked that twice. he say too that there is a cable with 5 volt. any idea ?
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Old 12-07-2012, 04:26 PM
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Re: Mass airflow problem

I don't have electrical schematics for a WK, but that is probably the 5 V feed for the Mass Airflow sensor, which comes from the PCM.
There seems to be a fuse as well for the Mass Airflow sensor, only don't know the position on the WK. Not sure if the 5V measured before is coming via this fuse.
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Old 12-07-2012, 05:11 PM
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Re: Mass airflow problem

have them clear the code using an OBD2 tool and also disconnect your battery for 5 minutes to reset the PCM.
can you post a photo of your engine compartment including the air filter housing and intake tube? its best to take the photo with the engine cover removed.

I wonder if there is a crack in the air intake tube. The other thing is the throttle control valve. The throttle control valve meters the fresh air versus the EGR air to your intercooler. I would've expected a different code from the throttle control valve, but I suppose anything is possible. No easy way to test the throttle control valve without the proper Chrysler tools.
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Old 12-17-2012, 12:58 PM
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Re: Mass airflow problem

i think the battery was disconnected for more than 5 min, but ill ask them for sure.

here the pic :
http://imageshack.us/a/img846/7734/jeepmoteur1.jpg
http://imageshack.us/a/img805/565/jeepmoteur2.jpg
http://imageshack.us/a/img16/9060/jeepmoteur3.jpg
http://imageshack.us/a/img600/3969/jeepmoteur5.jpg
http://imageshack.us/a/img109/5060/jeepmoteur4.jpg
http://imageshack.us/a/img248/3100/jeepmoteur6.jpg
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Old 12-17-2012, 05:46 PM
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Re: Mass airflow problem

has your jeep been in water? looks to me like the engine compartment was wet at some point and water can do strange things to electronics if it sits long enough.

also, what is that in the bottom of your air box in picture number 5? is it oil? if so, how did oil get there?

there are 2 sensors on the air box lid. One sensor is for Mass Air Flow (MAF). Another sensor is for Mass Air Pressure (MAP). Do you know for sure which sensor they changed? Can you post a part number and a picture of the part that was changed? I wonder which part they changed.

The MAF sensor is 53013673AA and costs at least $80US, probably much more in Quebec, like $125 Canadian.

The MAP sensor is 68066040AA and costs at least $40US, probably much more in Quebec, like $75 Canadian.

A MAF sensor looks very different from a MAP sensor.
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Old 12-17-2012, 07:13 PM
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Re: Mass airflow problem

never was in water for long time, not me, but i have it since a few month.

in picture 5 its not oil, its ice, there was a little piece of ice

for MAF or MAP i dont remember de price, but its the one that you need to remove the part right after air filter, ill take a pic of the old one tomorow, if i have time its starting to snow a lot here.

thanks for the help
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Old 12-19-2012, 08:39 PM
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Re: Mass airflow problem

here the pic of the piece that was changed

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