Apparatus, system, and method for accurately reading high and low temperatures

An electrical circuit, comprising:

• a thermistor communicable in temperature sensing communication with exhaust gas;
• a voltage supply communicable in voltage supplying communication with the thermistor;
• a high-resistance resistor between the thermistor and the voltage supply;
• a low-resistance resistor between the high-resistance resistor and the thermistor;
• a switch comprising a bypass line bypassing the high-resistance resistor, the switch being actuatable to direct current from the voltage supply through the high-resistance resistor and low-resistance resistor for exhaust gas temperatures within a low temperature range and to direct current from the voltage supply around the high-resistance resistor via the bypass line for exhaust gas temperatures within a high temperature range;
• an analog-to-digital converter that converts a voltage divider output signal representative of a temperature of the exhaust gas, the voltage divider output signal comprising a difference between a reference voltage and at least a voltage lost due to a combined resistance of the thermistor, high-resistance resistor, and low-resistance resistor in the low temperature mode, and a difference between the reference voltage and at least a voltage lost due to a combined resistance of the thermistor and low-resistance resistor in the high temperature mode;
• an electronic control module configured to predict an exhaust gas temperature, wherein the electronic control module is operable to control the actuation of the switch based on the predicted exhaust gas temperature;
• and
• an on-board diagnostics controller communicable in electronic communication with the electronic control module, wherein the on-board diagnostics controller triggers a thermistor diagnostic fault for voltage divider output signal values within predetermined voltage divider output signal value upper and lower ranges.