• ECT
• EOT
• IAT
• MAT
A thermistor sensor changes its electrical resistance with changes in temperature. Resistance in the
thermistor decreases as temperature increases, and increases as temperature decreases. Thermistors
work with a resistor that limits current in the ECM to form a voltage signal matched with a temperature value.
The top half of the voltage divider is the current limiting resistor inside the ECM. A thermistor sensor has two
electrical connectors, signal return and ground. The output of a thermistor sensor is a nonlinear analog signal.
