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Old 11-25-2002, 07:02 PM   #1
impreza2002
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1999 Impreza 2.5RS
RALLY BLUE

Default Need help to locate the wires!

Hi,
I have difficulty to locate the wires of the IAT (intake air temperature) sensor for my impreza'99 2.5RS. As far as I know, the IAT sensor is combined with the Mass Air Flow Sensor. And I just found four wires coming out from the plug of the Mass Air Flow Meter! The color of the wires are (coming out from the plug starting from left to right) red, red/blue, black, and yellow. Please help to find out which two are the wires for the IAT sensor. Thank you very much.
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Old 11-25-2002, 07:51 PM   #2
Mulder
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You didn't buy one of those kits on ebay that is supposed to give some huge HP increase by fooling the ECU by modifiying the IAT signal, did you? If you did don't install it, they don't work and may screw up your car.
If you're asking for a different reason then ignore this

Last edited by Mulder; 11-25-2002 at 09:23 PM.
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Old 11-25-2002, 08:02 PM   #3
ciper
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Thats exactly what I was thinking too.

I dont think we even have this sensor. The Barrometric pressure sensor in the ECU is the closest thing I know of.
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Old 11-25-2002, 09:11 PM   #4
Legacy777
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MAP based cars have an IAT sensor......MAF based cars do not have one.
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Old 11-26-2002, 02:28 AM   #5
impreza2002
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Isnt that the IAT sensor is built inside the MAF? If the MAF based cars do not have the IAT sensor, then how do these cars sense the temperature of the air coming from outside?
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Old 11-26-2002, 08:47 AM   #6
Legacy777
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Quote:
Originally posted by impreza2002
Isnt that the IAT sensor is built inside the MAF? If the MAF based cars do not have the IAT sensor, then how do these cars sense the temperature of the air coming from outside?
They don't. That's the whole point. MAF units measure the mass or the amount of air going into the engine. Air temp will change the reading in the MAF's measurements. So any additional air temp sensor is not needed.

MAP system use pressure & other sensors, like air temp charge to determine the amount of air going into the engine.
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