Yamaha YZF-R1 Series Service Manual page 555

SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
DTC Item
Abnormal CAN
communication
U0121
(between ABS
ECU and SCU)
Abnormal CAN
communication
U0125
(between IMU
and SCU)
Abnormal CAN
communication
U0155 (between meter
assembly and
SCU)
Abnormality in-
—
side SCU
Steering damper
stepping motor
(manufactured by
— Öhlins: optional):
open circuit or
short-circuit de-
tected.
Probable cause of
malfunction
• Defective connec-
tion of wire harness, • ERS adjustments can-
ABS ECU, and SCU
couplers. • The damping preset
• Wire harness conti-
nuity.
• Malfunction in SCU.
• Malfunction in ABS
ECU.
• Defective connec-
• ERS adjustments can-
tion of wire harness,
IMU, and SCU cou-
• The damping preset
plers.
• Wire harness conti-
nuity.
• Malfunction in SCU.
• Malfunction in IMU.
• Defective connec-
tion of wire harness, • ERS adjustments can-
meter assembly,
and SCU couplers. • The damping preset
• Wire harness conti-
nuity.
• Malfunction in SCU.
• Malfunction in meter
assembly.
• ERS adjustments can-
• Malfunction in SCU. • The "Err" and ERS
• Defective connec-
tion of stepping mo- • ERS adjustments can-
tor and SCU
couplers. • The damping preset
• Defective connec-
tion of sub-wire har-
• The auxiliary system
ness coupler.
• Short circuit in wire
harness or wire har-
ness continuity.
• Defective stepping
motor.
• Malfunction in SCU.
9-58
Vehicle symptom Fail-safe system operation
not be performed.
value is fixed at the
prescribed position
(automatic setting
modes).
not be performed.
value is fixed at the
prescribed position
(automatic setting
modes).
not be performed.
value is fixed at the
prescribed position
(automatic setting
modes).
not be performed.
icons are displayed on
the meter display.
not be performed.
value is fixed at the cur-
rent value.
warning light comes on
on the meter and the
steering damper warn-
ing icon is displayed on
the meter display.
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