2nd IAT sensor?

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Aug 3, 2009 | 06:38 PM

bynumj

Thread Starter

1st Gear Member

Joined: Jun 2007

Posts: 91

From: Portland, Oregon

2nd IAT sensor?

I installed the IAT relocation kit on my car because I am running a Vortech V3 non-cooled kit. I installed it by using the GY and GY-RD wires that went to the MAF (which has an IAT sensor in it). The GY wire is the IAT SN input to the PCM and the GY-RD is the SIG RT to the PCM. Can anyone explain how this works? I now that the IAT sensor is like a 2-wire RTD (resistance temperature detection) that varies resistance based on temperature. How does this sensor interact with the PCM. The GY-RD wire looks like it is a common. I want to use the sensor in the MAF to record the IAT before the supercharger; does anyone know how I can use the IAT sensor for this purpose?

Aug 3, 2009 | 07:29 PM

BruceH

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Joined: Jul 2008

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Last edited by BruceH; Jan 1, 2011 at 08:48 PM.

Aug 3, 2009 | 07:31 PM

BruceH

5th Gear Member

Joined: Jul 2008

Posts: 2,057

From: ......

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Last edited by BruceH; Jan 1, 2011 at 08:48 PM.

Aug 4, 2009 | 05:15 PM

bynumj

Thread Starter

1st Gear Member

Joined: Jun 2007

Posts: 91

From: Portland, Oregon

Quote:

Originally Posted by BruceH

Just went out and measured mine. With the key on I'm getting 2.5v on the gray wire. My guess would be it's the power line and the purple striped gray is the signal that comes after the sensor which as you guessed is more than likely a thermistor.

I did some more research and this is what I have found out so far.

PMC]---GR-RD (5V)---[IAT sensor/thermistor]---GR (var voltage)---[PMC---Resistor---

The PMC has a resistor in it that is in series with the IAT sensor. The voltage is read across the resistor to calculate the air intake temperature. Now all I need to know is what the IAT sensor specifications or chart looks like.

Last edited by bynumj; Aug 4, 2009 at 05:17 PM.