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 COMPONENT LOCATIONS . See Fig 1 . See MANIFOLD ABSOLUTE PRESSURE/CHARGE AIR PRESSURE SENSOR VOLTAGES table. 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 deferring engine temperatures. See Fig 1 . 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". See Fig 1 . Turn ignition off. Disconnect intake air temperature sensor connector. Start engine. Measure resistance between intake air temperature sensor terminals "B" and "D".
MANIFOLD ABSOLUTE PRESSURE/CHARGE AIR PRESSURE SENSOR VOLTAGES
| Vacuum/Pressure | Volts | |
|---|---|---|
| In. Hg | ||
| 7.4 | 0.9 | |
| 14.8 | 1.3 | |
| 29.53 | 2.1 | |
| psi | ||
| 18.1 | 2.5 | |
| 21.8 | 2.9 | |
| 25.4 | 3.3 | |
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE
| Temperature - °F (°C) | Volts | Ohms |
|---|---|---|
| -22 (-30) | 4.5 | 20,000-30,000 |
| 14 (-10) | 3.9 | 7000-11,400 |
| 68 (20) | 2.4 | 2100-2900 |
| 104 (40) | 1.5 | 1000-1300 |
| 140 (60) | 0.9 | 565-670 |
| 176 (80) | 0.5 | 295-365 |
| 194 (90) | 0.4 | 240-260 |