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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.
10.1 Check
Find and pull out the oxygen sensor connector at the front elbow of the muffler.
Use a multimeter to measure the resistance of the heating element of the two wires to 9±2kΩ; D350 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
Remove the right pedal and the right enclosure in the same way as shown in the figure according to the steps of "removing
spark plugs". Remove the connector from the frame
b. Remove the tie at the bottom.
c. Find the plug shown in the figure on the left side of the intake manifold, press the anti slip snap indicated by the arrow
and pull out the plug. Use a 22 # open-end wrench to remove the oxygen sensor from the muffler anticlockwise.
11. ECU
When the engine cannot be started and the performance is poor, check whether the ECU is normal. Because the ECU is more
complicated and difficult to judge, the elimination method can generally be used to remove the ECU from a normal vehicle of
the same model and replace it with a faulty vehicle.
Refer to the steps of "Maintenance-Rear Shock Absorption-Replacement Rear Shock Absorber" and remove the right tail skirt
to expose the ECU.
Summary of Contents for ZT350T-D
Page 1: ...1 152 ZT350T D Maintenance Manual 2022 11 24...
Page 50: ...50 152 D350 Braking system component diagram...
Page 88: ...88 152 Electrical schematic diagram of EFI system...
Page 124: ...124 152 Exploded view of front fork components Directional exploded view...
Page 125: ...125 152 Front fork exploded view...