Engine: Troubleshoot Intake Air Temperature Sensor (IAT)

Intake Air Temperature Sensor (IAT)

Aftermarket IAT Sensor Wiring

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

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 :

Most Standalone ECUS use GM IAT Sensor

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

GM IAT Sensor : 25036751 Pig Tail : 12102620