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 !

FacebookGoogle Bookmarks


Leave your comments

Post comment as a guest

0 / 300 Character restriction
Your text should be in between 10-300 characters

    Comments (2)

      • Robert Davis

        I am rebuilding a 2006 Rendezvous

      • Ted

        In reply to: Robert Davis

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

      Search Us Here...


      How Things Work

      Windshield Wiper System Operation

      The windshield wiper motor module is part of the windshield wiper motor cover and controls wiper motor operation. The accessory voltage supply circuit to the windshield wiper motor assembly is used to operate the wiper motor in all modes. The windshield wiper motor is a 2 speed motor and is operated at low speed in all modes except HIGH.

      Read more...

      Common Engine Codes

      P0128 Coolant Temp Below Themostat Threshold

      An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the powertrain control module (PCM) for engine control and as an enabling criteria for some diagnostics.

      Read more...