TAYO Zontes ZT125-M 2022, Maintenance Manual

Page: 108 / 188

108 / 188
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
M310 Three-in-one sensor
The fault code can be read through the diagnostic tool to confirm whether the three-in-one
sensor is faulty.
For details on the disassembly and assembly of the three-in-one sensor, please refer to the
description in "Maintenance-Throttle Valve Body- Disassembly of the Three-in-One Sensor".
The resistance of the two terminals T and G can be measured to determine whether it is
abnormal. The resistance value at 25°C (77F) is 1940
～
2040Ω.
M125 sensor
For the disassembly, assembly and inspection of the M125 throttle valve body position sensor
and the external intake pressure sensor, please refer to the previous section on the throttle valve
body.
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. M310 located on the right side of the intake
manifold.M125 under thethermostat on the right side of the vehicle. 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)