Yamaha WR250R Service Manual page 308

Fault
code Symptom
No.
No normal signals are
received from the speed sen-
sor.
42
Open or short circuit in neutral
switch.
Supply power to the fuel injec-
43 tor and fuel pump is not nor-
mal.
Error is detected while read-
44
ing or writing on EEPROM.
Power supply to the FI system
46
relay is not normal.
Faulty ECU memory. (When
this malfunction is detected in
50 the ECU, the fault code num-
ber might not appear on the
meter.)
70 Left idle control
No signals are received from
Er-1
the ECU.
No signals are received from
Er-2 the ECU within the specified
duration.
Data from the ECU cannot be
Er-3
received correctly.
Non-registered data has been
Er-4
received from the meter.
Sensor operation table
Diagnos
tic
monitori
ng code
No.
01 Throttle angle
Fully closed position
G
Fully opened position
G
Open or short circuit in wiring harness.
G
Defective speed sensor.
G
Malfunction in vehicle speed sensor
G
detected unit.
Malfunction in ECU.
G
Open circuit in wire harness.
G
Defective neutral switch.
G
ECU is defective.
G
Open circuit in wire harness.
G
Malfunction in ECU.
G
Defective relay unit (fuel pump).
G
Malfunction in ECU. (CO concentration
G
adjustment valve cannot be correctly writ-
ten to or read from internal memory)
Malfunction in charging system.
G
Malfunction in ECU. (The program and
G
data are not properly written on or read
from the internal memory.)
After 20 minutes left idling, the ECU auto-
G
matically stops the engine.
Open or short circuit in communication line.
G
Malfunction in meter unit.
G
Malfunction in ECU.
G
Open or short circuit in communication line.
G
Malfunction in meter unit.
G
Malfunction in ECU.
G
Open or short circuit in communication line.
G
Malfunction in meter unit.
G
Malfunction in ECU.
G
Open or short circuit in communication line.
G
Malfunction in meter unit.
G
Malfunction in ECU.
G
Item
15–19
95–100
FUEL INJECTION SYSTEM
Probable cause of malfunction
Meter display
8-37
Diagnostic
code No.
07
21
09
60
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Checking method
Check with throttle fully
closed.
Check with throttle fully open.