Trouble Diagnosis - Sym ATTILA RS-21 EFi 150 Service Manual

Trouble Diagnosis

EFI Electrical Circuit Inspection
Does the warning lamp goes on for 2 seconds
and then off?
Battery voltage over 12.5V?
The voltage difference between battery and
ECU is less than 0.2V.
1. Turn off the ignition switch.
2. Disconnect the ECU connector.
3. Turn on the ignition switch.
4. With a multi-meter to measure the voltage
th
between the 17 pin(+) and the 1
5. 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.
This chapter Contents
4. FUEL INJECTION SYSTEM
Turn on the ignition switch.
OK
OK
st
pin (-).
OK
OK
OK
OK
END
1. Burnt Bulb?
2. Blown fuse?
3. Battery voltage too low?
NG
4. Poor wire contact on ECU
circuit?
5. Poor contact on the master
switch?
6. Malfunction of ECU?
1. abnormal charging circuit?
NG
2. Battery cannot be
charged?
3. Short wire circuit?
NG
1. abnormal wire connection?
NG
1. abnormal wire connection ?
NG
1. abnormal wire connection?
2. Malfunction of ECU?
1. abnormal wire connection?
NG
2. Malfunction of relay?
3. Malfunction of ECU?
4-5