Problem with my 2006 Buick Lucerne CXS
Engine size = 4.6 Northstar V8 (y)
Question = 5 plug wires for IAT, need help decoding the colors of the wires.


Answer: The intake air temperature (IAT) sensor is a variable resistor. The IAT sensor has a signal circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM) supplies 5 volts to the IAT signal circuit, and a ground for the IAT low reference circuit. When the IAT sensor is cold, the sensor resistance is high. When the air temperature increases, the sensor resistance decreases. With high sensor resistance, the ECM detects a high voltage on the IAT signal circuit. With lower sensor resistance, the ECM detects a lower voltage on the signal circuit.


The IAT is internal to the Mass Airflow Sensor. The unit is usually just refereed to as the MAF, or MAT/IAT. The wire colors are as follows.

  • Blk/wht- sensor ground
  • Tan/DkBlue- low reference to ECM
  • Pnk/Blk- fuse sensor supply voltage
  • Tan- IAT sensor signal
  • Tn/Yel- MAF sensor signal


More Auto Repair Help


Be Social With Us !

Leave your comments

Post comment as a guest

0
    • Guest - Ryan

      I have a 2012 GMC Sierra 1500 what color of wires are my IAT

    • Guest - Robert Davis

      I am rebuilding a 2006 Rendezvous

    • Guest - Ted

      In reply to: Guest - Robert Davis

      I am rebuilding a 2006 Rendezvous
      <br />Really? Gee isn't that nice !


    Latest Articles

    How Does the Keyless Entry ...

    The remote keyless entry system performs the following ...

    Engine Turns Over But Won't ...

    Question: I have a 2001 Ford Explorer 4.0. Engine turns ...

    2006 Ford Escape ABS And 4WD ...

    2006 Ford Escape 3.0 litre Warning lights = abs and ...

    Clicking In 1996 Buick Regal ...

    ABS Problem with my 1996 Buick Regal 3100-SFI -V6.ABS light ...

    How Things Work

    How Does the Keyless Entry System Work?

    The remote keyless entry system performs the following functions:

    Locking the vehicle doors
    Unlocking the vehicle doors
    Opening the rear compartment lid

    The keyless entry system is equipped with an alarm feature that performs the following functions:

    Read more...

    Common Engine Codes

    Oxygen Sensor Code P0130 - P0141

    The powertrain control module (PCM) supplies a bias voltage of about 450 mV between the heated oxygen sensor (HO2S) high signal circuit and the HO2S low reference circuit. When measured with a 10 mega ohm digital voltmeter, this may display as low as 350 mV. The oxygen sensor signal varies from about 800 mV when the exhaust is rich, to about 50 mV when the exhaust is lean.

    Read more...