Throttle valve position sensor

THROTTLE VALVE POSITION SENSOR

A- - (pin 16) B- + 5V pin (14) C- Signal (pin 30) This consists of a potentiometer whose mobile part is controlled by the throttle valve spindle. During operation, the ECU supplies the potentiometer with a voltage of 5 Volts. The measured parameter is throttle position from minimum to full opening for injection control mnagement. According to output voltage, the ECU recognises throttle valve opening condition and corrects mixture concentration accordingly. With the throttle closed, an electrical voltage signal is sent to the ECU, which recognises idling and cut-off conditions (differentiating between them on the basis of engine rpm). The potentiometer is single ramp type; its main characteristics are as follows: Effective electrical angle: 90° ± 2° Mechanical angle: 105° ± 4° Total mechanical travel: 110° ± 8° Track resistance: 1200 ± 20% Ω Temperature operating range: -30°C - +125°C

ENGINE COOLANT TEMPERATURE SENSOR

This sensor is installed in the coolant circuit. It consists of a brass case and the actual resistance is made up of an NTC thermistor (negative temperature coefficient). In practice, sensor electrical resistance drops as temperature rises. According to engine coolant temperature, the NTC thermistor alters its ohmic resistance in accordance with the graph in the figure.