Yamaha YZF-R1 Series Service Manual page 548

SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
DTC Item
P21CF [P21CF] Secondary
P21D0 injector #1: malfunc-
P21D1 tion in secondary in-
P21D2 jector #1.
[P21D0] Secondary
injector #2: malfunc-
tion in secondary in-
jector #2.
[P21D1] Secondary
injector #3: malfunc-
tion in secondary in-
jector #3.
[P21D2] Secondary
injector #4: malfunc-
tion in secondary in-
jector #4.
P2228 [P2228] Atmospheric
P2229 pressure sensor:
ground short circuit
detected.
[P2229] Atmospheric
pressure sensor:
open or power short
circuit detected.
U0125 Signals cannot be
transmitted between
the ECU and the IMU.
Probable cause of
malfunction
• Defective coupler Loss of engine power. O
between secondary
injector and ECU.
• Open or short cir-
cuit in wire harness
between secondary
injector and ECU.
• Defective second-
ary injector.
• Malfunction in ECU.
• Improperly installed
secondary injector.
Engine is difficult to
[P2228] Low voltage
of the atmospheric start.
pressure sensor cir- Increased exhaust
cuit (0.5 V or less) emissions.
[P2229] High voltage Insufficient power at
of the atmospheric high altitudes.
pressure sensor cir- Engine idling speed is
cuit (4.8 V or more) unstable.
• Defective coupler
between atmospher-
ic pressure sensor
and ECU.
• Open or short cir-
cuit in wire harness
between atmospher-
ic pressure sensor
and ECU.
• Improperly installed
atmospheric pres-
sure sensor.
• Defective atmo-
spheric pressure
sensor.
• Malfunction in ECU.
• Defective IMU cou- Engine cannot be
pler or ECU coupler. started.
• Open or short cir-
cuit in wire harness
between IMU and
ECU.
• Malfunction in IMU.
• Malfunction in ECU.
9-51
Fail-safe system op-
Vehicle symptom
2
carried out.
Air induction system
solenoid is turned on
all the time (air induc-
tion system air cut
off).
ISC feedback is not
carried out.
ISC learning is not
carried out.
Injection to the appli-
cable cylinder group
(cylinders #1 and #2
or cylinders #3 and
#4) is cut off.
QSS is not carried
out.
α–N is fixed.
Intake air pressure
difference is fixed to 0
[kPa].
Atmospheric pres-
sure is fixed to 101.3
[kPa].
Atmospheric pres-
sure sensor output
correction value is
fixed to 0.
Fuel is not cut off due
to the intake air pres-
sure difference.
O
2
carried out.
ISC feedback is not
carried out.
ISC learning is not
carried out.
QSS is not carried
out.
Engine cannot be
started.
eration
feedback is not
feedback is not