Engine: Troubleshoot Intake Air Temperature Sensor (IAT)

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Intake Air Temperature Sensor (IAT)[edit]

IATStock01.gif

IATStock02.gif

IATStock03.gif

IATStock04.gif

IATStock05.gif

Aftermarket IAT Sensor Wiring[edit]

If you want to use an aftermarket IAT sensor when replacing the stock MAF you want to wire it like this:

IATWires.jpg

  1. Green With Yellow Stripe: 5V power for Baro Sensor (Pin 61 on 91-93 ECU)
  2. Orange: Baro Singal to ECU (Pin 65 on 91-93 ECU)
  3. Blue with Yellow Stripe: Airflow Signal to ECU(Pin 70 on 91-93 ECU)
  4. Red: Power for Airflow sensor, (To Control Relay)
  5. Black: Ground for IAT, Airflow and BARO signal (Pin 72 on 91-93 ECU)
  6. Red with Blue Stripe: IAT signal going to ECU (Pin 52 on 91-93 ECU)
  7. Red With White Stripe: Air Flow sensor Reset Signal (Pin 19 on 91-93 ECU)
  8. Not used :

MAF18.jpg

Mafwires.jpg

Most Standalone ECUS use GM IAT Sensor[edit]

GMIAT.jpg

Found at GM parts Direct: http://www.gmpartsdirect.com/

GM IAT Sensor : 25036751 Pig Tail : 12102620

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