RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
Intake Air Temperature Sensor: Testing and Inspection
To perform a complete test of the intake manifold air temperature sensor and its circuitry, refer to DRB tester and appropriate Powertrain Diagnostics
Procedures. To test the sensor only, refer to the following:
Intake Manifold Air Temperature Sensor - Typical
1. Disconnect the wire harness connector from the intake manifold air temperature sensor.
Sensor Resistance (Ohms) - Coolant Temperature Sensor/Intake Air Temperature Sensor Chart
2. Test the resistance of the sensor with an input impedance (digital) volt-ohmmeter. The resistance (as measured across the sensor terminals) should
be as shown in the SENSOR RESISTANCE (OHMS)-COOLANT TEMPERATURE SENSOR/INTAKE AIR TEMPERATURE SENSOR chart.
Replace the sensor if it is not within range of resistance specified in chart.
3. Test the resistance of the wire harness. Do this between the PCM wire harness connector A-15 and the sensor connector terminal. Also check
between PCM connector A-4 to the sensor connector terminal. Repair the wire harness as necessary if the resistance is greater than 1 ohm.
