RAM 1500 Van V8-5.2L VIN Y (1999)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
COOLANT TEMPERATURE SENSOR
To perform a complete test of the engine coolant temperature sensor and its circuitry, refer to DRB scan tool and appropriate Powertrain
Diagnostics Procedures. To test the sensor only, refer to the following:
The engine coolant temperature sensor is installed into a water jacket at front of intake manifold near rear of generator. If equipped with this
engine, gaining access may be done from front of vehicle without removal of engine cover or air cleaner housing.
Engine Coolant Temperature Sensor-Typical
1. Disconnect wire harness connector from coolant temperature sensor.
2. When removing the connector from sensor, do not pull directly on wiring harness. Fabricate an L-shaped hook tool from a coat hanger
(approximately eight inches long). Place the hook part of tool under the connector for removal, The connector is snapped onto the sensor. It is not
equipped with a lock type tab.
3. Test the resistance of the sensor with a high input impedance (digital) volt-ohmmeter. The resistance (as measured across the sensor terminals)
should be as shown in the SENSOR RESISTANCE (0HMS)-CO0LANT TEMPERATURE SENSOR/INTAKE AIR TEMPERATURE SENSOR
resistance chart. Replace the sensor if it is not within the range of resistance specified in the chart.
4. Test continuity of the wire harness between the PCM wire harness connector and the coolant sensor connector terminals. Repair the wire harness if
an open circuit is indicated.
