Zontes ZT125-M 2022, Руководство по обслуживанию

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Due to limited space, it is recommended to use a 72-tooth 17# ratchet wrench to remove the water and oil shared sensor
counterclockwise, and remove the 9×2 EPDM rubber O-ring. New O-rings need to be replaced during reassembly to avoid
leakage.
Standard torque
：
13±1.5N.m (1.3±0.2 kgf.m,10±1 lbf. ft)
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 M350
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. The oxygen sensor of
M350 is located at the front bend of the muffler.
Use a multimeter to measure the resistance of the heating element of the two wires to 9±2kΩ (M310/350 are white wires,
M125 is red and white wire); M310/350 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.