P1239-Engine Oil Temperature Too Low: Notes

Fig 1: Engine Oil Temperature Sensor Circuit Wiring Diagram

Courtesy of CHRYSLER GROUP, LLC

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article  .

The Engine Oil Temperature (EOT) Sensor is a variable resistor that measures the temperature of the engine oil. The Powertrain Control Module (PCM) supplies a 5-Volt reference and a ground to the sensors low reference signal circuit. When the oil temperature is low, the sensor resistance is high. When the oil temperature is high, the sensor resistance is low.