Sym MAXSYM 400i Service Manual page 77

4. Fuel Injection System
Troubleshooting
EFi Circuit inspection
Warning lights extinguished after 2 seconds?
Battery voltage above 12.5V?
Battery voltage & ECU of voltage less than 0.2 V?
1.
Main switch OFF
2.
Removed ECU coupler
3.
Main switch ON
4.
Use voltage meter measurement of the power-pin
voltage difference
5.
Confirmed ECU and battery supply voltage
differential pressure within the 0.2 V voltage
Battery voltage – drive parts voltage of less than 0.2
V?
1. Main switch OFF
2.
Removed the injector, fuel pump, O2 sensor, roll
over sensor, ignition coil couplers
3.
Measurement of the voltage between the couplers
and ground of the voltage difference
4.
Confirmed voltage difference and battery voltage
of 0.2 V gap within?
ECU 5V voltage - sensor voltage of less than 0.2 V?
1. Main switch OFF
2.
Use probe inserted throttle sensor, engine
temperature sensor, the inlet pressure sensor
power connector
3. Main switch ON
4.
Use voltage meter measurement of the sensor
connector voltage
5.
Voltage standard value
Battery voltage - fuel pump voltage of less than 0.2
V?
1. Main switch OFF
2.
Removed fuel pump power coupler
3.
Potential probe then pumped two-pin connector
4. Main switch ON
5.
Pumped in three second record supply voltage
values
6.
Confirmed pump and battery supply voltage
differential pressure within the 0.2 V voltage
4-32
To this chapter contents
: 5.0±0.1V
Main switch on
1.
2.
3.
NG
4.
5.
OK
6.
1.
NG 2.
3.
OK
NG
1.
OK
NG
1.
OK
1.
Lines anomaly?
NG
2. ECU
OK
1.
Lines anomaly?
NG 2.
Relay fault?
3.
ECU anomaly?
OK
End
Bulbs broken?
Fuse broken?
Battery voltage is too low?
ECU Power line bad contact?
Poor contact the main power
switch?
ECU fault？
Charging line anomaly?
Unable electrical storage
batteries?
Short-circuit leakage?
Lines anomaly?
Lines anomaly?
anomaly?