TAYO ZONTES 310T-M 2022, Maintenance Manual

Page: 109 / 188

109 / 188
10. Oxygen Sensor
●The oxygen sensor must be removed after the engine and muffler have cooled down completely.
When there is poor engine performance, unstable idle speed, high fuel consumption, and incorrect air-fuel ratio, check the
oxygen sensor. The fault code can be read through the diagnostic Speedometer to confirm whether the oxygen sensor is faulty.
M310 M125
10.1 Check
First follow the steps of disassembling the glove box to remove the glove box and find the four-pin plug of the oxygen sensor.
Pinch the top of the plug with two fingers, press the arrow indicating buckle, and then pull it out.
Use a multimeter to measure the resistance of the heating element of the two wires to 9±2kΩ (M310 are white wires, M125 is
red and white wire); M310 model can measure the current should be less than or equal to 2.1A. Otherwise, it can be judged that
the oxygen sensor is faulty. The ceramic inside the oxygen sensor is hard and brittle. It is forbidden to knock with hard objects or
blow with strong gas, otherwise it is easy to cause damage.
Or remove the oxygen sensor and observe the color of the top part of the head, which is normally light gray. If it is white, it
means that the silicon poisoning has been damaged and needs to be replaced, if it is black, it means that there is carbon
deposits that can be cleaned up and continue to use; if it is brown, it means that the silicon poisoning needs to be replaced.
10.2 Replace
M310: First pull out the plug, use needle-nose pliers to remove the buckle (1) from the bracket, and then use a 22# open-end
wrench to remove it counterclockwise. Install after cleaning the installation surface.
The thread of the new sensor is coated with a special paste-like thread anti-sintering agent to prevent air leakage and
facilitate subsequent disassembly. If there is no problem after removing the old inspection, you need to apply a proper amount
of anti-sintering agent to the thread before installation.
Torque standards
：
44N.m (4.5 kgf.m, 32 lbf. ft).
Oxygen sensor thread: M18×1.5.
M125: After finding the oxygen sensor plug, first push the dark red buckle in the direction of the arrow, then hold the plug
end of the oxygen sensor with one hand, press the buckle indicated by the arrow on the cable end with the other hand, and pull
out the plug. Then use a 22# open-end wrench to remove it counterclockwise. Install after cleaning the installation surface.