Yamaha WR250R Service Manual page 325

Fault code No. Er-3 Symptom
Diagnostic monitoring
code No.
Order Item/components and probable cause
1 Connected state of connector
G Main wire harness ECU coupler
2 Open or short circuit in wire harness lead.
3 Malfunction in meter unit
4 Malfunction in ECU
Fault code No. Er-4 Symptom
Diagnostic monitoring
code No.
Order Item/components and probable cause
1 Connected state of connector
Main wire harness ECU coupler
G
2 Open or short circuit in wire harness lead.
3 Malfunction in meter unit
4 Malfunction in ECU
Data from the ECU cannot be received correctly.
— —
Check or maintenance job
G
G
G
G
G
(Yellow/Blue–Yellow/Blue)
G
G
Non-registered data has been received from the meter.
— —
Check or maintenance job
G
G
G
G
G
(Yellow/Blue–Yellow/Blue)
G
G
8-54
FUEL INJECTION SYSTEM
Check the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.
If there is a malfunction, repair it
and connect it securely.
Repair or replace if there is an
open or short circuit.
Between meter coupler and ECU
coupler
Replace the meter unit.
Replace the ECU.
Check the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.
If there is a malfunction, repair it
and connect it securely.
Repair or replace if there is an
open or short circuit.
Between sensor coupler and ECU
coupler
Replace the meter unit.
Replace the ECU.
Reinstatement
method
Reinstated if nor-
mal signal is
received from the
ECU when the
main switch is
turn to ON.
Reinstatement
method
Reinstated if nor-
mal signal is
received from the
ECU when the
main switch is
turn to ON.