Grand Cherokee 4WD V8-5.2L VIN Y (1998)
Intake Air Temperature Sensor: Testing and Inspection
INTAKE MANIFOLD AIR TEMPERATURE SENSOR
To perform a complete test of the intake manifold air temperature sensor and its circuitry, refer to Powertrain Management/Computers and
Control Systems/Testing and Inspection.
See: Testing and Inspection
To test the sensor only, refer to the following:
Fig. 57 IAT Sensor - V8
1. Disconnect the wire harness connector from the intake manifold air temperature sensor (Fig. 57).
CTS & IAT Resistance Chart Verses Temperature
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 previous 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.
