The Oil Temperature Sensor (OTS) is a thermistor type sensor that has a variable resistance when
exposed to different temperatures. See Figure 3-18.
See Figure 3-19 for the OTS used in the Series 2000 engines and Series 4000 engines, construction and industrial applications.
The ECM uses the OTS signal to determine the quantity and timing of fuel required to optimize starting over a range of temperatures (except Series 4000 engines).
The OTS provides a signal to vary idle speed and injection timing resulting in improved cold starts and reduced white smoke. It also activates the engine protection if the oil temperature exceeds the specified limits (except Series 4000 engines).
