Charge Air Pressure/Intake Air Temperature Sensor

Connect vacuum/pressure gauge to intake manifold. Turn ignition on. Backprobing charge air pressure/intake air temperature sensor connector, measure voltage between charge air pressure/intake air temperature sensor connector terminals "A" and "C" with pressure and vacuum applied. See Fig 1 & MANIFOLD ABSOLUTE PRESSURE/CHARGE AIR PRESSURE SENSOR VOLTAGES . Replace sensor if voltage is not as specified.
To test intake air temperature sensor on 9-3 and 9-5 (2.3L) models, turn ignition on. Backprobing, measure voltage between intake air temperature sensor terminals "A" and "B" with engine running and at differing engine temperatures. Turn ignition off. Disconnect intake air temperature sensor connector. Start engine. Measure resistance between intake air temperature sensor terminals "A" and "B" at deferring engine temperatures.
To test intake air temperature sensor on 9-5 (3.0L) models, turn ignition on. Backprobing, measure voltage between intake air temperature sensor terminals "B" and "D". Turn ignition off. Disconnect intake air temperature sensor connector. Start engine. Measure resistance between intake air temperature sensor terminals "B" and "D".

Fig 1: Charge Air Pressure/Intake Air Temperature Sensor Connector View (All Models)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

MANIFOLD ABSOLUTE PRESSURE/CHARGE AIR PRESSURE SENSOR VOLTAGES

INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE