Zontes ZT350T-D, Maintenance Manual

Page: 78 / 152

78 / 152
1. Dump switch
Fuel cut off
during driving
Can ride
normally
Short-circuit the
black-brown, white-
yellow wires
connected to the
dump switch
Can't ride
normally
Check ECU, fuel
pump, throttle
valve body, etc.
Replace the
dump switch
2. OBD port
The main cable has its own OBD interface, and the
location is shown in the previous section to read the fault
code through the diagnostic Speedometer. Use the
diagnostic tool through the diagnostic interface to read
historical fault codes, current fault codes, clear fault codes
and read ECU status.
The picture above shows the cable end connector
No. 1 5 6 7 14 16
Color
Blue/y
ellow
green
yellow/
white
brown/
white
green/
black
Red
3. Fuel pump
Caution:
●The fuel pump is a precision component that needs to be
assembled in a dust-free workshop and requires rigorous
testing, so it is forbidden to disassemble it by yourself.
●The engine of this vehicle is designed with a high
compression ratio. It is recommended to add 95# and
above unleaded gasoline for a long time. In order to extend
the service life of the vehicle, please be sure to go to a
regular gas station to refuel.
●It is forbidden to run the fuel pump in dry state or in
water, otherwise its service life will be shortened, and it will
be directly damaged in severe cases. The positive and
negative wires of the fuel pump cannot be connected in
reverse. It is forbidden to disassemble the fuel inlet filter,
which may cause foreign matter to enter the fuel pump or
block the fuel injector.
●The disassembly of the fuel pump or high-pressure fuel
pipe should be carried out in a well-ventilated, dust-free or
dust-less environment; dangerous operations such as
fireworks or mobile phones should be strictly prohibited in
the disassembly site.
When it is difficult to start the engine or start without
dust; the engine is not working well, the operation is
unstable, etc.; the fuel injector does not inject fuel; the
engine is running weak and the acceleration performance is
deteriorated. It is necessary to check whether the fuel
pump is abnormal.
Refer to the steps of "Maintenance-Fuel Pipe-
Replacement of High-pressure Fuel Pipe" in this manual to
remove the surrounding bottom plate and high-pressure
fuel pipe. Refer to the section "Maintenance-Fuel Pipe-Fuel
Pump" to measure fuel pressure with a fuel pressure gauge,
or use a simple test method to test whether the fuel pump
is normal.
If the fuel pump needs to be removed from the vehicle,
the fuel pump can be used to drain the fuel in the fuel tank.
After lifting the vehicle, press the plug buckle as shown in
the figure to pull out the cable. Remove 5 bolts from the
bottom with a 10# sleeve, and then remove the fuel pump
after removing the high-pressure fuel pipe bracket. Be
careful not to press the fuel outlet pipe shown in the red
circle. Once damaged, you can only replace the entire fuel
pump assembly.