Zontes ZT350T-D, Руководство по обслуживанию, Страница: 81 / 152

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8. Throttle valve body
8.1 Common failure phenomena
1. The engine is easy to stall when the vehicle is running, and it is difficult to start, especially cold starting.
2. Idle speed is unstable or no idle speed, and there is intermittent jitter when accelerating.
3. Insufficient power, poor acceleration performance and unstable operation.
8.2 Disassembly
Please refer to the description in "Maintenance-Throttle Valve Body" in this manual for detailed steps of disassembling and
assembling the throttle body, three-in-one sensor and stepper motor.
8.3Troubleshooting process
Throttle body troubleshooting
process
Idle speed adjustment
bolts are loose, return
springs are stuck, etc.
According to the idle speed,
determine the position of the idle
speed adjustment bolt and fix it;
replace the return spring or clean
the valve plate
Throttle body sensor
performance inspection
The fault light is always
on during riding
Check the corresponding sensor according
to the fault code, if the line is normal, it can
be judged that the sensor is faulty and
needs to be replaced
The diagnostic instrument
reads the data stream, and
the engineer needs to judge
whether the sensor is
working properly
8.4 Sensor
D350 sensor
For the disassembly and inspection of the throttle valve body position sensor and the external intake
pressure sensor, see the throttle valve body section above.
Air filter intake air temperature sensor
Remove the temperature sensor from the air filter and place it in the ambient temperature 20
℃
（
68F
）～
30
℃（
86
）
, and use a multimeter to check whether the resistance of the two pins is between
2726
～
1770 Ω.
9. Water and oil shared sensor
When the engine is difficult to start, the idling speed is unstable, the engine
performance is poor, and the engine is easy to stall, check whether the sensor is
abnormal. The fault code can be read through the diagnostic Speedometer to
confirm whether the water and oil shared sensor is faulty.
First, remove the storage box by referring to the steps for dismantling the
storage box. Refer to the steps for removing the throttle valve body to remove the
throttle valve body to facilitate the removal of the water and oil shared sensor.
located on the right side of the intake manifold. First pinch the top of the plug,
press down the anti-dropping card, and then unplug the plug.
The normal temperature resistance value of the two pins of a multimeter is
1.5
～
4.0kΩ.
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)