Ambient Air Temperature Sensor Circuit A High

Where it lives

For P0073, the circuit described runs through the sensor. The description of P0073 reports a fault at the sensor.

Check these first

• An open in the AAT sensor signal wire
• A failed AAT sensor reading above range
• Corrosion or damage at the AAT sensor connector
• High resistance in the AAT sensor circuit
• A fault in the ECM AAT input

What to do next

1. Read the AAT sensor value on a scan tool
2. Test the AAT signal wire for an open
3. Measure AAT sensor resistance and compare it to spec
4. Inspect the AAT connector and wiring for damage
5. Replace the AAT sensor if it reads above range
6. Clear the code and retest

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