Comprehensive Maintenance List - Sym HD2 125 Service Manual

Comprehensive Maintenance List

Maintenance
No. Testing Procedures
Project
1 Power and ● Use meter direct
measurement battery voltage
voltage
● Use diagnosis tool detection
of battery voltage
Fuel
2 ● Use fuel pressure gauge,
connected in series between
pressure
the injector and the Pressure
Regulating Valve
● Main switch ON, but not
start engine
● Check fuel pressure
● Start engine (idle)
● Check change of the fuel
pressure
● throttle several rotation
● check to the change of fuel
pressure again
3 Ignition state ● The spark plug removed from
the cylinder head, but the
power lines still ring
● Start engines or use for the
diagnosis tool of output View
spark plug ignition conditions
4 Engine ● Diagnosis tool to detect the
use of
vacuum
Injection
5 ● The injector removed from
the throttle body, but not
state
dismantle pipeline
● Main switch ON, but not
start engine
● Investigation the injector it's
leaking fuel?
● Once again start engines or
use for the diagnosis tool of
output function
● Check injector fuel injection
and the injection situation
6 Closed - ● Use of diagnostic tool
observation O2 Sensor
loop control
voltage changes
system
7 Fault Code ● Use of the diagnosis tool
existing fault-detection code
Detection
or historical Fault Code
● Elimination of the
implementation of fault
codes, check can be
eliminated
● Once again start engine
● Check fault is it happen
again
Notes: 1.Fuel pressure gauge connected between the fuel tank and injector, open the main switch to
repeatedly shut down, fuel system makes pressure stability.
2. Injector and injector cap tightly by hands, fuel spills should not be the case.
To this chapter contents
Test items Determine benchmarks
● Battery voltage ● Battery voltage = 10V Above
● Open the main ● Open main switch, but not
switch, but not to start srart:
the engine of pressure = 250kPa (Stable
pressure value)
● Pressure in idle ● Idle state:
● Rotating throttle, pressure = 294±6kPa
situation of pressure (Beating situation from top to
changes bottom)
● rotation throttle moment:
pressure = 294±6kPa (Slightly
beating)
● Spark plug ● Specifications: NGK-CR8H
specifications ● Ignition conditions:
● Whether the spark With traditional engines found
plug ignition ways
● Spark plug sparks
whether it is normal
strength
● Manifold pressure of ● Manifold pressure
diagnosis tool
● Open the main ● Not started, injector not
switch, but did not
start engine the ● In started, the injection state
injection situation
● Injector state when
start
● Stable condition, ● Idle stable condition: O2
sensor voltage Sensor voltage = 50 ~ 200mV
variation (Idle (Show from top to bottom
continued 5 minutes beating phenomenon)
later to
measurement)
● Diagnosis tool of the ● Without any residual Fault
fault code is it can be Code
eliminated ● If residual Fault Code,
● Start again, the fault according to the "Fault Code
is it will happen again Maintenance Form"
implementation of
troubleshooting
5. Fuel Injection System
=32~38kPa
leaking fuel
must show fan shape
Fault reasons
● Battery electricity
● Battery connector loose
● Harness circuit opening
● ECU coupler not connected
properly
● Fuel not enough
● Security switch not disarm
● Ruel pump relay fault
● Ruel pump fault
● Injector fault
● ECU fault
● Spark plug fault
● Roll over sensor fault
● ECU No. 5 pin fault
● Ignition coil fault
● Crankshaft position sensor
fault
● Valve clearance abnormal
● Intake system leak
● Security unit is configured
not disarm
● Fuel pump relay fault
● Fuel pump fault
● Injector fault
● ECU fault
● O2 Sensor fault
● ECU fault
● throttle position sensor fault
● Engine temperature sensor
fault
● Intake temperature sensor
fault
● Manifold pressure sensor
fault
● O2 Sensor fault
● Crankshaft position sensor
fault
● ECU fault
● Roll over sensor fault
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