Zontes ZT350T-D, Maintenance Manual

Page: 84 / 152

84 / 152
The engine cannot start and there is no sign of fault diagnosis process
When the start button is pressed and the starter motor can drive the engine to run normally, but the engine does not work
normally, and there is no sign of the car, you can refer to the following diagnosis process to troubleshoot the cause of the fault.
Unable to start
Check the
high-voltage
spark of the
ignition coil
N
No spark or weak
strength
Check the ignition
system
Y
With car signs Y
Check if the air
filter element is
blocked
N
Check whether the
fuel pump is
working
N Check for leaks
Y
replace
Y
Check whether the
injector is normal
N
Check fuel pump
and cable
N
Check the injector
and wiring
Y
Measure fuel
pressure
Normal
Check cylinder
pressure
Toog low
Check fuel pump, fuel
tank vent pipe, carbon
canister
Too high
Check the fuel
pump pressure
regulating valve
Check spark plug
gap
Measure fuel
pressure
Check the three-
in-one sensor and
the water and oil
shared sensor
Check the idle speed
control valve
Check cylinder
pressure
Check if fuel is
sufficient
N
Add fuel
Y
The engine cannot be started and there is a car symptom fault diagnosis process
When the start button is pressed, the starter motor can drive the engine to run normally. When there are signs of a car but
cannot start, you can refer to the following diagnosis process to troubleshoot the cause of the fault.
Check the diagnostic code
with a diagnostic tool
Y
Corresponding investigation
according to the code table
N
Turn the right hand to the
rubber sleeve
Y
Check the idle speed
control valve and its wiring
N
Check the air filter outlet pipe and
the air filter element; whether the
fuel tank vent pipe, carbon
canister and other hoses are
blocked or bent too large
N
Troubleshoot problems
found
Y
Check whether the high
voltage spark is normal
N
Check the ignition coil
Y
Check whether the ignition
timing is normal
N
The engine is returned to the
factory to adjust the timing
Y
Check the amount of fuel in the fuel
tank; the vent pipe and the fuel
pump and the filter of the fuel pump
N
Do not add fuel; check
whether the cable is
broken or open the circuit;
check whether the fuse is
blown; check the fuel
pump
Y
Check the three-in-one sensor
N
Replace the sensor
Y
Check the spark plug, and check
the valve clearance if necessary;
if the spark plug is wet, check
whether the injector is abnormal
and whether it is dripping
Use a multimeter to check
the EFI system
Check cables, relays, ECU,
insurance, water temperature
sensor
Injector etc.