Yamaha MT-09 2021 - Page 495

9-65
SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
P062F EEPROM DTC: an
error is detected
while reading or
writing on EE-
PROM.
• CO adjustment
value is not prop-
erly written.
• ISC learning value
is not properly writ-
ten.
•O
2
feedback learn-
ing value is not
properly written.
•OBD memory val-
ue is not properly
written.
• Malfunction in
ECU.
Increased exhaust
emissions.
Engine cannot be
started or is difficult
to start.
Engine idling speed
is unstable.
OBD memory value
is not correct.
CO adjustment val-
ue for the faulty cyl-
inder = 0 (default
value)
ISC learning values
= Default values.
OBD memory value
is initialized.
Initialization of O
2
feedback learning
value.
Cruise control sys-
tem cannot be oper-
ated. (for
MTN890D)
P0638 YCC-T drive sys-
tem: malfunction de-
tected.
• Defective coupler
between throttle
servo motor and
ECU.
• Open or short cir-
cuit in wire har-
ness between
throttle servo mo-
tor and ECU.
• Defective throttle
servo motor.
• Throttle servo mo-
tor is stuck (mech-
anism or motor).
• Malfunction in
ECU.
• Blown electric
throttle valve fuse.
Engine response is
poor.
Loss of engine pow-
er.
Engine idling speed
is unstable.
O
2
feedback is not
carried out.
YCC-T evacuation
is activated.
Output is restricted.
ISC feedback is not
carried out.
ISC learning is not
carried out.
QSS is not carried
out.
Cruise control sys-
tem cannot be oper-
ated. (for
MTN890D)
P0657 Fuel system volt-
age: incorrect volt-
age supplied to the
fuel injector and fuel
pump.
• Open or short cir-
cuit in wire har-
ness between
relay unit and
ECU.
• Open circuit in wire
harness between
battery and ECU.
• Defective relay
unit.
• Malfunction in
ECU.
Engine is difficult to
start.
Increased exhaust
emissions.
Monitor voltage = 12
[V]
O
2
feedback is not
carried out.
Cruise control sys-
tem cannot be oper-
ated. (for
MTN890D)
P0914 Gear position sen-
sor: signal stuck
• Improperly in-
stalled gear posi-
tion sensor.
• Defective gear po-
sition sensor.
• Malfunction in
ECU.
Improper display for
position.
Engine response is
poor.
QSS is not carried
out.
Cruise control sys-
tem cannot be oper-
ated. (for
MTN890D)
DTC Item
Probable cause of
malfunction
Vehicle symptom
Fail-safe system
operation