Yamaha YZF-R1 2020 Service Manual page 550

SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
DTC Item
P0606 Internal malfunction in
ECU. (When this mal-
function is detected in
the ECU, the DTC
might not appear on
the tool display.)
P062F EEPROM DTC: an er-
ror is detected while
reading or writing on
EEPROM.
P0638 YCC-T drive system:
malfunction detected.
P0657 Fuel system voltage:
incorrect voltage sup-
plied to the fuel injec-
tor and fuel pump.
Probable cause of
malfunction
• Malfunction in ECU.
• CO adjustment val-
ue is not properly
written.
• ISC learning value is
not properly written.
• O feedback learn-
2
ing value is not
properly written.
• OBD memory value
is not properly writ-
ten.
• Malfunction in ECU.
• Defective coupler
between throttle ser-
vo motor and ECU.
• Open or short cir-
cuit in wire harness
between throttle ser-
vo motor and ECU.
• Defective throttle
servo motor.
• Throttle servo mo-
tor is stuck (mecha-
nism or motor).
• Malfunction in ECU.
• Blown electric throt-
tle valve fuse.
• Open or short cir-
cuit in wire harness
between relay unit
and ECU.
• Open circuit in wire
harness between
battery and ECU.
• Defective relay unit.
• Malfunction in ECU.
9-55
Vehicle symptom
Engine cannot be
started.
Engine response is
poor.
Loss of engine power.
Increased exhaust
emissions.
Engine cannot be
started or is difficult to
start.
Engine idling speed is
unstable.
OBD memory value is
not correct.
Engine response is
poor.
Loss of engine power.
Engine idling speed is
unstable.
Engine is difficult to
start.
Increased exhaust
emissions.
Fail-safe system op-
eration
Engine cannot be
started.
Ignition and injection
are not carried out.
Judgment for other
DTCs is not carried
out.
Load control is not
carried out. (The relay
unit, radiator fan mo-
tor relay, and other re-
lays are all turned off.)
The CO adjustment
mode and diagnostic
mode cannot be acti-
vated.
Output is restricted.
CO adjustment value
for the faulty cylinder
= 0 (default value)
ISC learning values =
Default values.
OBD memory value is
initialized.
Initialization of O
2
feedback learning val-
ue.
O feedback is not
2
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.
Monitor voltage = 12
[V]
O feedback is not
2
carried out.