Zontes ZT125-M 2022, Maintenance Manual

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Cable end Relay
3 and 5 are normally closed contacts, which can be
tested with a multimeter buzzer. 1 and 2 are normally open
contacts. Otherwise, it can be judged as a relay failure.
The following cable end colors are for reference and the
actual vehicle shall prevail. Different batches of thread
colors may vary, but the function is the same.
Cable end wire color
：
Wire
no. Relay
1 2 3 5
light Red
Blue/w
hite
Black
and
white
White
Start
assist
green
Green
red
Black/
white
Red
green
Oil pump White/
black
Red/bl
ack
White/
black
Green/y
ellow
Main
relay
Red
White/
black
Black/
white
Orange
black
Front
motor
green
Light
green
black White
Rear
motor
green
Light
green
black White
cooling
fan
green
Green/
white
black
Green
blue
Rear box
start
green
Light
green
White
Black/w
hite
6. Fuel injector
When the engine is unstable and weak, and the power
performance is poor, check whether the injector is normal.
Need to remove the cushion and storage box first.
Can be judged by the following methods
：
a. Park the vehicle firmly, start the engine, and let the
engine run at idle speed. Use the auscultation needle or
stethoscope to listen to the working sound of the cylinder.
You should be able to hear the rhythmic working sound of
the injector. If the sound is clear and even, it works
normally. If the sound is low or cannot be heard, the
injector needs to be removed for troubleshooting. Or the
engine stalls when the injector plug is unplugged, indicating
that the injector is normal.
b. Pull out the plug after pressing the anti-trip lock. Using
a multimeter to measure the static coil resistance should be
12±0.6Ω, otherwise the injector must be replaced if it fails.
If you need to replace the fuel injector, wait until the
engine and muffler have cooled down. After placing the oil
container at the bottom, refer to the steps for removing
the high-pressure oil pipe to pull out the high-pressure oil
pipe at the end of the fuel pump to discharge the remaining
fuel. Use a 10# sleeve to remove the bolt
⑴
, remove the
injector holder ⑵ , and then take off the injector ⑶ .
7. Ignition coils
There is no high-voltage spark; the high-voltage spark is
weak; when the engine is started without dust, check
whether the ignition coil is normal. Common faults of
general ignition coils such as short circuit, open circuit or
grounding of the coil will cause no high voltage. In addition,
the material of the ignition coil insulation layer is aging, the
insulation performance is deteriorated, and the leakage of
the ignition coil makes the electric spark weak and the
ignition energy is insufficient. As a result, it causes unstable
idling, intermittent flameout and inability to catch fire.
When encountering this kind of failure, it is necessary to
check whether the resistance and insulation performance
of the ignition coil meet the requirements, if not, replace it.
Remove the spark plug from the engine and install it on
the high-pressure cap according to the steps in the section
"Maintenance-Spark plug-Removing the spark plug". Put
away the side brackets, use the main bracket to park the
vehicle firmly and unlock the vehicle, turn the flameout
switch to "", hold the brake handle, and place the spark