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Old 11-10-2008, 03:10 PM   #1
KB21
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Join Date: Aug 2008
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2004 Impreza WRX
PSM

Default P0102 and P0113 CELs

My car felt kinda sluggish this morning so I decided to see if I had any CELs (no light but I decided to check anyways). AP read two CELs--P0102 (Mass Air Flow Circuit Low Input) and P0113 (Intake Air Temperature Circuit High Input). I checked to make sure that all hoses were connected and it seems like nothing is loose. What could be the cause of these? And what should I check?

Current mods: Injen CAI, Invidia catted DP, GrimmSpeed catless UP (with resistor mod), HKS catback, AP V1 with Clark Turner Stage 2 base map (tuned for Injen CAI).

Please help me out.

Thanks!
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Old 11-10-2008, 03:20 PM   #2
thejordan
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put on the stock airbox and run the cobb stg 2, your map might not be as compatible as you think. thats the simplest/easiest first step.
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Old 11-10-2008, 08:14 PM   #3
romanlynch
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if hes tuned for the cai then hes tuned for the cai. you could try cleaning your maf sensor.
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Old 11-10-2008, 09:41 PM   #4
my4isflat
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Were these pending codes? Oil impregnated filter that was recently cleaned, or never cleaned? Clean the MAF sensor and go from there.
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Old 11-10-2008, 09:58 PM   #5
KB21
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The CAI filter does need to be cleaned/changed. I actually have a brand new one sitting around. It's just such a pain in the a$$ to take the bumper off... but I guess it needs to be done.

What do you mean by "pending codes"? I thought that all codes are of the same variety.

Can you guys please explain, step by step, how to clean the MAF sensor? I know these suckers are really sensitive and I don't want to destroy it so it would be nice to have good instructions.

Thanks!
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Old 11-11-2008, 04:25 AM   #6
KB21
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I found an old thread that explains how to clean MAF so I'll do that tomorrow. The only thing that I am unsure of is whether I need to disconnect the battery before I take the MAF sensor out. So... do I need to disconnect the battery?
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Old 11-11-2008, 10:16 AM   #7
Haelan
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Quote:
Originally Posted by KB21 View Post
I found an old thread that explains how to clean MAF so I'll do that tomorrow. The only thing that I am unsure of is whether I need to disconnect the battery before I take the MAF sensor out. So... do I need to disconnect the battery?
The service manual usually recommends disconnecting the battery. I've unplugged my MAF several times without doing so with no ill effects.

As for your codes, you have a wiring issue or your MAF is dead. Your MAF consists of two sensors housed in one unit: air flow and temperature. Since you're getting codes for both it sound like the wiring harness is unplugged or cut.

Trace the wiring and you'll probably find the issue.
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Old 11-11-2008, 10:44 AM   #8
KB21
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Quote:
Originally Posted by Haelan View Post
The service manual usually recommends disconnecting the battery. I've unplugged my MAF several times without doing so with no ill effects.

As for your codes, you have a wiring issue or your MAF is dead. Your MAF consists of two sensors housed in one unit: air flow and temperature. Since you're getting codes for both it sound like the wiring harness is unplugged or cut.

Trace the wiring and you'll probably find the issue.
Thanks for suggestions, man. I hope that MAF is still alive. I'll trace the wires as you suggested, but the first time I looked, I didn't find anything disconnected. I don't even get the "check engine" light (at least, not yet). If I didn't run CELs off the AP, I wouldn't have even known.

Once I take MAF sensor out for cleaning is there a way to tell if it's fried?
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Old 11-11-2008, 11:02 AM   #9
Haelan
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Quote:
Originally Posted by KB21 View Post
Thanks for suggestions, man. I hope that MAF is still alive. I'll trace the wires as you suggested, but the first time I looked, I didn't find anything disconnected. I don't even get the "check engine" light (at least, not yet). If I didn't run CELs off the AP, I wouldn't have even known.

Once I take MAF sensor out for cleaning is there a way to tell if it's fried?
Easiest way is to swap MAF's with a buddy. Since both portions of the MAF are not working correctly you probably won't be able to see any physical signs of the problem unless you cracked it open (which I don't recommend).

Trace the wiring all the way back to the ECU. Check for a loose wiring plug there too.
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