Working principle and maintenance method of throttle position sensor and oxygen sensor in Cherokee EFI automobile system

Throttle position sensors are of variable resistance type, that is, a rated voltage is added to both ends of a resistor, and an output voltage is connected to the slider, and the position of the slider is judged by this output voltage, that is, the different positions of the throttle are judged.

The oxygen sensor is installed on the exhaust pipe, and its inner wall is made of special material, which is also connected with the atmosphere and exhaust gas. No matter what type, when the oxygen concentration of the inner and outer walls of the sensor is different, the tube wall of special material (silicon dioxide, etc.) will be caused. ) to generate a voltage. By measuring this voltage, the oxygen concentration in the exhaust gas can be judged, and then the combustion state, that is, whether the mixture is rich or lean, can be judged.

As for the maintenance method, the sensor is basically maintenance-free, and it will be broken if it is changed. Only need to judge whether they are normal or damaged.

As mentioned above, it is enough to measure the voltage at the voltage output terminal with a multimeter. The voltage is normal within the design range.