Yamaha YZF-R1 Series Service Manual page 542

SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
DTC Item
P0480 Radiator fan motor re-
lay: open or short cir-
cuit detected.
P048B EXUP servo motor:
signal stuck
P048D [P048D] EXUP servo
P048E motor: open or ground
short circuit detected.
[P048E] EXUP servo
motor: power short
circuit detected.
Probable cause of
malfunction
• Open or short cir- Engine is difficult to
cuit in wire harness. start.
• Disconnected cou- Loss of engine power.
pler. Engine overheats.
• Defective radiator Increased exhaust
fan motor relay. emissions.
• Defective radiator
fan motor relay con-
troller (Malfunction
in ECU).
• Defective coupler Loss of engine power. Learning values for
between EXUP ser-
vo motor and ECU.
• Open or short cir-
cuit in wire harness
between EXUP ser-
vo motor and ECU.
• Improperly installed
EXUP servo motor
and cables.
• Defective EXUP ser-
vo motor.
• Stuck EXUP servo
motor (mechanism
or motor).
• Malfunction in ECU.
• Defective coupler Loss of engine power. Learning values for
between EXUP po-
sition sensor and
ECU.
• Open or short cir-
cuit in wire harness
between EXUP po-
sition sensor and
ECU.
• Defective EXUP po-
sition sensor.
• Malfunction in ECU.
9-45
Fail-safe system op-
Vehicle symptom
Radiator fan motor re-
lay is off all the time.
O
2
carried out.
ISC feedback is not
carried out.
ISC learning is not
carried out.
fully closed EXUP are
fixed.
Learning values for
fully open EXUP are
fixed.
O
2
carried out.
fully closed EXUP are
fixed.
Learning values for
fully open EXUP are
fixed.
O
2
carried out.
eration
feedback is not
feedback is not
feedback is not