Air Temperature Sensor
- Turn ignition off. Disconnect airflow meter. Check air temperature sensor circuit of airflow meter by measuring resistance across airflow meter terminals No. 1 and No. 4 (Gray/Blue and Gray/Violet wire terminals).
- Compare resistance values with specification in AIR TEMPERATURE SENSOR RESISTANCE table. If resistance is not within specification, replace airflow meter.
AIR TEMPERATURE SENSOR RESISTANCE
| Air Temperature - °F (°C) | Ohms |
|---|---|
| 14 (-10) | 8,260-10,560 |
| 63-73 (17-23) | 2,200-2,700 |
| 117-127 (47-53) | 760-910 |
NOTE:
On 525i, 535i and 735i models with self-diagnostics, a short or open in the air temperature sensor will set a Code 44. If Code 44 is set, MCU will operate engine with preset air temperature value.