P0102 Problems

1312 Views 2 Replies 3 Participants Last post by snowwy66, Oct 20, 2018

mnhff

Discussion Starter · Oct 19, 2018

Hi all,

So i have the 2013 1.8L six speed manual. My car keeps on throwing me the P0102 Low MAF voltage code. So I tried the standard remedy of cleaning the MAF with no luck. MAF is as clean as can be. I also removed and inspected the rubber hose that goes from the MAF to the throttle body and inspected it for cracks. I did see and hand full of tears but they didn't look like they went all the way through the hose. I did a quick pressure test of the hose and didn't feel any air coming out of where the tears were so I don't think thats the problem. I also got a brand new air filter but that didn't help either.

I'm running out of ideas, anyone else have any?

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Robby

· #2 · Oct 19, 2018

The electrical sensor that is part of the maf has high resistance.....nothing to do with airflow.
That is why you are getting a low voltage code most likely.
The ecm sends a specific voltage to the maf and looks at return voltage, expecting a certain return voltage based on rpm/throttle position/engine load.

It does not like the return voltage....it is getting implausable information.
Inspecting any airplaths between the maf to the throttle body was the correct start of the diagnosis......as long as you are satisfied there are no vacuum leaks from hoses feeding the intake manifold there isn't much beyond part replacement.

Rob

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snowwy66

· #3 · Oct 20, 2018 (Edited)

The best way to check for vacuum leaks is to use a chemical. Propane, brake or carb cleaner. Even ether will work but not recommended.

Spray the hose. With short bursts. If it's leaking, it will suck in the chemical which will effect the idle.

If idle isn't effected. You've got not leaks. If it goes up or down. That's your leak. The computer might compensate and adjust the idle back to normal. So pay close attention to the sound of the idle speed.

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