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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
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