Sym X'PRO RV125 User Manual

5. Fuel Injection System
5-10
Troubleshooting
EFi circuit inspection
Switch on
NG
NG
OK
OK
OK
OK
OK
NG
NG
NG
NG
OK
Does the warning lamp goes on for 2 seconds and
then off?
Is battery voltage over 12.5V?
The voltage difference between battery and ECU is
less than 0.2V.
1. Turn off the main switch.
2. Disconnect the ECU connector.
3. Turn on the main switch.
4. With a multi-meter to measure the voltage
between the F4 pin(+) and the H4 pin (-).
Make sure the voltage difference between
battery and ECU is less than 0.2V.
The voltage difference between battery and active
components is less than 0.2V.
1. Turn off the ignition switch.
2. Disconnect the connectors of the fuel injector,
by-pass valve, and ignition coil.
3. Measure the voltage between battery negative
side and the each connector (1).
4. Make sure the voltage difference between
battery and those active components is less
than 0.2V.
The voltage difference between 5V-sensors is less
than 0.2V.
1. Turn off the ignition switch.
2. Disconnect the connectors of throttle valve
position sensor and intake manifold
temperature/pressure sensors.
3. Turn on the ignition switch.
4. Measure the voltage between the pins(1)(4) of
throttle valve position, and the pins of intake
manifold temperature/pressure sensors (1) (3) is
within 5V±0.2V.
The voltage difference between battery and fuel
pump is less than 0.2V.
1. Turn off the ignition switch.
2. Disconnect the fuel pump connector.
3. With the probes of multi-meter to touch the
positive & negative sides of the fuel pump.
4. Turn on the ignition switch.
5. Record the voltage difference of the fuel pump
within 3 seconds.
6. Make sure the voltage difference between
battery and fuel pump is less than 0.2V.
1. Burnt Bulb?
2. Blown fuse?
3. Battery voltage too low?
4. Poor wire contact on ECU
circuit?
5. Poor contact on the master
switch?
6. Malfunction of ECU?
1. Abnormal charging circuit?
2. Battery cannot be charged?
3.
Short wire circuit?
1. Abnormal wire connection?
1. Abnormal wire connection?
1. Abnormal wire connection?
2. Malfunction of ECU?
1. Abnormal wire connection?
2. Malfunction of relay?
3. Malfunction of ECU?
END
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Sym X'PRO RV125 Specifications

General

Brand	Sym
Model	X'PRO RV125
Category	Scooter
Language	English