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mass air flow sensor effecting transmission? ??


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dizzy
New User

Oct 21, 2013, 7:26 AM

Post #1 of 5 (3085 views)
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I have a 2003 Kia Rio with about 170,000 miles on it 1.6 liter Automatic transmission.
My acceleration is slow to build up to 2000rpm and on the way upthe needle on the rpm bounces as if I am pressing the accelerator intermittently. However, this happens as I have constant pressure on the pedal.
My engine light comes and goes. I got it diagnosed and 3 trouble codes came up. Mass air flow circuit range/performance problem, gear four incorrect ratio, check TCM.
the tech told me that the mass airflow may be the issue but to clean it first and it works fine for two days then back to the same thing.
The thing that has me skeptical is the fact that this problem comes and goes


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 21, 2013, 1:43 PM

Post #2 of 5 (3071 views)
Re: mass air flow sensor effecting transmission? ?? Sign In

You need to post actual code numbers, not descriptions.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
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Oct 21, 2013, 5:16 PM

Post #3 of 5 (3061 views)
Re: mass air flow sensor effecting transmission? ?? Sign In

If you getting a MAF code, you need to fix that problem first before going after the transmission. The MAF sensor is a critical sensor and is used in calculating what the transmission's line pressure should be depending on engine load. If the MAF is messing up and causing the PCM to miscalculate engine load, it could damage the transmission.

The MAF sensor can be tested with a volt meter or scope. A scope is preferable because the problem the MAF might be having is a glitch a multimeter can't catch. Inspect the MAF sensor connector, wiring, and terminal tension. Wiggle the harness around while your watching the MAF's output to see if you have some sort of connection issue. Also make sure the intake ducting isn't ripped or has hoses disconnected from it.





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(This post was edited by Discretesignals on Oct 21, 2013, 5:17 PM)


dizzy
New User

Oct 22, 2013, 4:40 AM

Post #4 of 5 (3043 views)
Re: mass air flow sensor effecting transmission? ?? Sign In


In Reply To
You need to post actual code numbers, not descriptions.


The 3 codes that come up are p0101, p0734, p1529


dizzy
New User

Oct 22, 2013, 4:47 AM

Post #5 of 5 (3041 views)
Re: mass air flow sensor effecting transmission? ?? Sign In


In Reply To
If you getting a MAF code, you need to fix that problem first before going after the transmission. The MAF sensor is a critical sensor and is used in calculating what the transmission's line pressure should be depending on engine load. If the MAF is messing up and causing the PCM to miscalculate engine load, it could damage the transmission.

The MAF sensor can be tested with a volt meter or scope. A scope is preferable because the problem the MAF might be having is a glitch a multimeter can't catch. Inspect the MAF sensor connector, wiring, and terminal tension. Wiggle the harness around while your watching the MAF's output to see if you have some sort of connection issue. Also make sure the intake ducting isn't ripped or has hoses disconnected from it.


Thanks so much. Gonna get a new MAF today since I cleaned and checked wiring only to have the issue come back. I will update you on the out come. Thank you for your assistance.






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