Yamaha R15 2022 Service Manual page 382

FUEL INJECTION SYSTEM TROUBLESHOOTING
COMMUNICATION ERROR WITH THE METER
Fault code
no.
ECU internal
malfunction (Output
signal error)
Er-1
ECU internal
malfunction (Output
signal error)
Er-2
ECU internal
malfunction (Output
signal error)
Er-3
ECU internal
malfunction (Input
signal error)
Er-4
Probable cause of
Item
malfunction
• Open or short circuit
in wire harness be-
tween meter and
ECU.
• Defective coupler
between meter and
ECU.
• Defective meter
unit.
• Malfunction in ECU.
• Open or short circuit
in wire harness be-
tween meter and
ECU.
• Defective coupler
between meter and
ECU.
• Defective meter
unit.
• Malfunction in ECU.
• Open or short circuit
in wire harness be-
tween meter and
ECU.
• Defective coupler
between meter and
ECU.
• Defective meter
unit.
• Malfunction in ECU.
• Open or short circuit
in wire harness be-
tween meter and
ECU.
• Defective coupler
between meter and
ECU.
• Defective meter
unit.
• Malfunction in ECU.
Vehicle symptom
Signals cannot be
transmitted between
the ECU and the
meter.
Meter operation is
impossible.
Signals are not
received from the
ECU within the
specified duration.
Meter operation is
impossible.
Sending data from
the ECU cannot be
received correctly.
Meter operation is
impossible.
Registered data is
not received from the
meter.
Meter operation is
impossible.
8-49
ELEC – +
Fail-safe system
operation
Normally operated
except for the meter.
Normally operated
except for the meter.
Normally operated
except for the meter.
Normally operated
except for the meter.