Intake Air Temperature Sensor (All Except 944 Turbo)
Pull off airflow sensor plug. Connect an ohmmeter to terminals No. 1 and 4 of airflow sensor (on control unit terminal No. 6 and 22). Readings should be as shown in INTAKE AIR TEMPERATURE SENSOR SPECIFICATION table. If temperature sensor has an open circuit, it should cause a richer mixture. If temperature sensor has a grounded circuit, it should be leaner mixture.
NOTE:
It is important that intake air temperature be 60-85°F (15-35°C) for CO level adjustments.
INTAKE AIR TEMPERATURE SENSOR SPECIFICATION
| Temperature | Ohms |
|---|---|
| 32°F (0°C) | 4400-6800 |
| 60-85°F (15-30°C) | 1400-3600 |
| 105°F (40°C) | 1000-1300 |