Zontes ZT350T-D, Maintenance Manual

Page: 79 / 152

79 / 152
When reassembling, you need to pre-tighten diagonally
and then tighten the 5 bolts. Otherwise, the uneven
compression of the seal rubber ring of the fuel pump may
cause leakage and cause safety hazards.
4. Carbon canister solenoid valve
When the engine performance is poor; the idle speed is
poor; the air-fuel ratio is incorrect, the carbon canister
solenoid valve should be checked.
Use a multimeter to measure the resistance between the
two inserts of the canister solenoid valve plug should be
35±2Ω, otherwise it can be judged that the solenoid valve is
faulty.
5. EFI relay
There are one PVC sheaths at the right side of the veliche
near the ECU, there are 4 relays. One PVC sheaths at the
left rear of the frame, there are 2 relays.
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, subject
to the actual conditions of the motorcycle. The line colors
of different batches may be different, and the functions are
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
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
.