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post #1 of 5 (permalink) Old 01-04-2010, 06:16 PM Thread Starter
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Post Need Some Help, IAT Sensor

Ok heres the layout, droping parts in my 2000 Malibu, everything is fine. Put a cold air intake in, manufactured by MP Racing did everything the right way. Driving the car and the engine light comes on. Read the code and its "P0113" if you dont know what that means it reffers to the Intake Air Temperature Sensor. Reset the system and it came back on. I bought a new sensor and put it in and reseted the system again and it came back on. So i need some help, what should i do? Btw it seems like it comes on when i "open it up", decide to speed up.
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post #2 of 5 (permalink) Old 01-12-2010, 04:48 PM
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Re: Need Some Help, IAT Sensor

I'm guessing you went to AZ for a code read? Can you get a scanner and monitor the IAT readings and report back?

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post #3 of 5 (permalink) Old 01-22-2010, 08:03 AM Thread Starter
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Unhappy Re: Need Some Help, IAT Sensor

Ok so yeah i got a scanner and i have been monitoring it and its still shooting the same code. P0113, like i said i purchased a new sensor. I reset it and all but it keeps coming back because everything i have tried isnt working. I even tried something that worked in my previous car but didnt work. I bought a rubber tube and put the sensor in one end and pluged the other end into the intake and it still doing the same thing. I have to get my inspection done by the end of Feb, what else should i do.
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post #4 of 5 (permalink) Old 01-22-2010, 06:07 PM
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P0113 is an IAT Circuit High Input error. That indicates you could have:
Open circuit in harness
Sensor signal short to power
Damaged sensor
Improper harness connection
Damaged PCM

It's not impossible that a damaged or improperly relocated Mass Air Flow sensor can be behind this whole issue.

I haven't actually done a CAI (yet), but what I've seen on some sites and on TV's PowerBlock is a section of the intake that is the same diameter as the original for the MAF so it will continue to measure airflow correctly. If both IAT sensors, old and new, are causing the same code, then maybe the plug on the factory harness is damaged (pin bent/missing or wire shorted/cut) or the wire somewhere between the IAT and the PCM is damaged. Also check your MAF wiring.

When you open it up you have a higher airspeed, translating into lower temperature air, which is the whole idea in getting a CAI in the first place, right? So, if driving in the winter with a factory system doesn't cause the wind chill factor to cause an error, what changed from factory to CAI? If the sensor from factory to CAI was the original one, then I would suspect the wiring (again) because you've already replaced the sensor once. Unless you just happened upon one that was bad out of the box - rare, but it happens.

Did you relocate the MAF and install it in a larger tube? Did you rebuild or move the wires in any plugs? Is the wire in the same location or has it been moved and possibly routed over a sharp corner?

Check your wiring is what I would suggest.


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post #5 of 5 (permalink) Old 01-22-2010, 06:25 PM
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Re: Need Some Help, IAT Sensor

A Scanner would show the readings. The Air Temp reading is controlled by the resistance of the IAT.

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