RAM 2500 Truck 4WD V8-5.9L VIN Z LDC (1998)
Intake Air Temperature Sensor: Testing and Inspection
Fig. 69 Intake Manifold Air Temperature Sensor
1. Disconnect the wire harness connector from the intake manifold air temperature sensor.
Sensor Resistance (OHMS) - Coolant Temperature Sensor/Intake Air Temperature Sensor
2. Test the resistance of the sensor with an input impedance (digital) volt-ohmmeter. The resistance (as measured across the sensor terminals) should
be less than 1340 ohms with the engine warm. Refer to the Coolant Temperature sensor/Intake Air Temperature sensor resistance chart. Replace
the sensor if it is not within the range of resistance specified in the chart.
3. Test the resistance of the wire harness. Do this between the Powertrain Control Module (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.
NOTE: for additional testing information, see Testing and Inspection/Test TC-57A or Test TC-58A.