YAMAHA YZF-R1SC 2004 Service Manual

7-17
Intake air pressure sensor output
voltage
3.75
4.25 V Tester positive probe
pink / white
Tester negative probe
black / blue
1
2
FUEL INJECTION SYSTEMFI
Fault code No.13SymptomIntake air pressure sensor – open or short circuit detected.
Used diagnostic code No. 03 (intake air pressure sensor)
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.If there is a malfunction, repair it and connect it
securely.
Intake air pressure sensor coupler
Main wiring harness ECU coupler
Sub-wire harness couplerReinstated by
turning the
main switch
ON.
2Open or short circuit in wiring harness
and / or sub lead.Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
Black / Blue – Black / Blue
Pink / White – Pink / White
Blue – Blue
3Defective intake air pressure sensorExecute the diagnostic monitoring mode (Code
No.03).
Replace if defective.
1. Connect the pocket tester (DC 20 V) to the
intake air pressure sensor coupler terminal as
shown.
2. Set the main switch to “ON”.
3. Measure the intake air pressure sensor output
voltage.
4. Is the intake air pressure sensor OK?
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7-18
FUEL INJECTION SYSTEMFI
Fault code No.14SymptomIntake air pressure sensor – hose system malfunction (clogged or detached
hose).
Used diagnostic code No. 03 (intake air pressure sensor)
OrderInspection operation item and probable
causeOperation item and countermeasuerReinstatement
method
1Intake air pressure sensor hose detached,
clogged, kinked, or pinched.
Intake air pressure sensor malfunction at
intermediate electrical potential.Repair or replace the sensor hose.
Inspect and repair the connection.Reinstated by
starting the
engine and
operating it at
2Connected condition of connector
Intake air pressure sensor coupler
Main wiring harness ECU couplerCheck the coupler for any pins that may have
pulled out.
Check the looking condition of the coupler.
If there is a malfunction, repair it and connect it
securely.idle.
3Defective intake air pressure sensor.Execute the diagnostic mode (Code No.03).
Replace if defective.
Refer to “Fault code No. 13”.
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7-19
FUEL INJECTION SYSTEMFI
Fault code No.15SymptomThrottle position sensor – open or shrt circuit detected.
Used diagnostic code No. 01 (throttle position sensor)
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Installed condition of throttle position
sensor.Check the installed area for looseness or
pinching.
Check that it is installed in the specified
position.
Refer to “THROTTLE BODIES” section.Reinstated by
turning the
main switch
ON.
2Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.If there is a malfunction, repair it and connect it
securely.
Throttle position sensor coupler
Main wiring harness ECU coupler
Sub-wire harness coupler
3Open or short circuit in wiring harness
and / or sub lead.Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
Black / Blue – Black / Blue
Yellow – Yellow
Blue – Blue
4Throttle position sensor lead wire open
circuit output voltage check.Check for open circuit and replace the throttle
position sensor.
Black / Blue – Yellow
Open circuit item Output voltage
Ground wire open 5 V
circuit
Output wire open 0V
circuit
Power supply wire 0V
open circuit
5Defective throttle position sensor.Execute the diagnostic mode (Code No.01).
Replace if defective.
Refer to “THROTTLE BODIES” section.
Fault code No.16SymptomStuck throttle position sensor detected.
Used diagnostic code No.01 (throttle position sensor)
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1When detecting fault code No.15.Refer to “Fault code No.15”.Reinstated by
2Installed condition of throttle position
sensor.Check the installed area for looseness or pinching.
Check that it is installed in the specified position.
Refer to “THROTTLE BODIES” section.starting the
engine,
operating it at
idle and then3Defective throttle position sensorExecute the diagnostic mode (Code No.01).
Replace if defective.
Refer to “THROTTLE BODIES” section.idle, and then
racing it.
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7-20
FUEL INJECTION SYSTEMFI
EXUP servomotor resistance
(when the pulley is turned once)
5.25
9.75 kΩ at 20C (68F) Positive tester terminal
blue
Negative tester probe
white / red
1
2
Fault code No.17SymptomEXUP servo motor potention circuit – open or short circuit detected.
Used diagnostic code 53
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.If there is a malfunction, repair it and connect it
securely.
EXUP servo motor coupler
Main wireharness ECU couplerReinstated by
turning the
main switch
ON.
2Open or short circuit in wire harness.Repair or replace if there is an open or short
circuit.
Between motor coupler and ECU coupler
Blue – Blue
White / Red – White / Red
Black / Blue – Black / Blue
3Defective EXUP servo motor potention
circuit.Execute the diagnostic mode (Code No.53).
Replace if defective.
1. Disconnect the EXUP servomotor coupler from
the wire harness.
2. Connect the pocket tester (Ω  1k) to the
EXUP servomotor coupler.
3. While slowly turning the EXUP servomotor
pulley, measure the EXUP servomotor resis-
tance.
4. Is the EXUP servomotor OK?
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7-21
FUEL INJECTION SYSTEMFI
To prevent damaging the EXUP servomo-
tor, perform this test within a few seconds
of connecting the battery. Positive battery terminal
black / green
Negative battery lead
black / red
1
2
CAUTION:
Fault code No.18SymptomEXUP servo motor is stuck.
Used diagnostic code 53
OrderInspection operation item and probable
couseOperation item and countermeasureReinstatement
method
1Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
couplerIf there is a malfunction repair it and
connect it securely.
EXUP servo motor coupler
Main wire harness ECU coupler.Reinstated by
turning the
main switch
ON.
It takes 120
2Open or short circuit in wire harness.Repair or replace if there is an open
or short circuit.
Between motor coupler and ECU coupler.
Black / Green – Black / Green
Black / Red – Black / Redseconds at the
maximum
before the
original state
returns.
3Defective EXUP servo motor.Execute the diagnostic mode (Code No.53).
Replace if defective.
1. Disconnect the EXUP cables from the EXUP
servomotor pulley.
2. Disconnect the EXUP servomotor coupler from
the wire harness.
3. Connect the battery leads to the EXUP servo-
motor coupler as shown.
4. Check that the EXUP servomotor pulley ro-
tates several times.
5. Does the EXUP servomotor pulley turn?
4Defective EXUP valve, pulley, cable.Replace if defective
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7-22
FUEL INJECTION SYSTEMFI
Fault code No.19SymptomOpen circuit in the input line of ECU No.15 terminal is detected.
Used diagnostic code No. 20 (sidestand switch)
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Connected condition of connector
Main wiring harness ECU coupler
(No.15 pin)
Execute the diagnostic mode (Code No.20).
Check the coupler for any pins that may have
pulled out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connected it
securely.If the
transmission is
in gear, it is
reinstated by
retracting the
sidestand.
If the
2Open or short circuit in wiring harness
and / or sub lead.Repair or replace if there is an open or short
circuit.
Between sidestand switch coupler and ECU
coupler
Blue / Black – Blacktransmission is
in neutral, it is
reinstated by
reconnecting
the wiring.
3The malfunction of the sidestand switch.Replace if defective.
Refer to “CHECKING THE SWITCHES” in
chapter 8.
Fault code No.20SymptomDefective values are detected due to the internal malfunction of the intake air
pressure sensor or the atmospheric pressure sensor.
Used diagnostic code No. 02 (atmospheric pressure sensor)
1
03 (intake air pressure sensor)
2
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Defective atmospheric pressure sensorExecute the diagnostic mode (Code No.02).
Replace if defective.
Refer to “Fault code No.23”.Reinstated by
turning the
main switch
2Defective intake air pressure sensorExecute the diagnostic mode (Code No.03).
Replace if defective.
Refer to “Fault code No.13”.ON.
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7-23
FUEL INJECTION SYSTEMFI
Fault code No.21SymptomOpen or short circuit is detected from the coolant temperature sensor.
Used diagnostic code No. 06 (coolant temperature sensor)
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.If there is a malfunction, repair it and connect it
securely.
Coolant temperature sensor coupler
Main wiring harness ECU coupler
Sub-wire harness couplerReinstated by
turning the
main switch
ON.
2Open or short circuit in wiring harness
and / or sub lead.Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
Black / Blue – Black / Blue
Green / White – Green / White
3Defective coolant temperature sensor.Execute the diagnostic mode (Code No.06).
Replace if defective.
Refer to “COOLING SYSTEM” in chapter 8.
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7-24
FUEL INJECTION SYSTEMFI
Intake air temperature sensor
resistance
2.21
2.69 kΩ at 20C (68F) Tester positive probe
brown / white
Tester negative probe
black / blue
1
2
12

Handle the intake air temperature sensor
with special care.

Never subject the intake air temperature sen-
sor to strong shocks. If the intake air temper-
ature sensor is dropped, replace it.
WARNING
Fault code No.22SymptomOpen or short circuit detected from the intake temperature sensor.
Used diagnostic code No. 05 (intake temperature sensor)
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.If there is a malfunction, repair it and connect it
securely.
Intake temperature sensor coupler
Main wiring harness ECU coupler
Sub-wire harness couplerReinstated by
turning the
main switch
ON.
2Open or short circuit in wiring harness
and / or sub lead.Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
Black / Blue – Black / Blue
Brown / White – Brown / White
3Defective intake temperature sensor.Execute the diagnostic mode (Code No.05).
Replace if defective.
1. Remove the intake air temperature sensor
from the air filter case.
2. Connect the pocket tester (Ω  100) to the
intake air temperature sensor terminal as
shown.
3. Measure the intake air temperature sensor
resistance.
4. Is the intake air temperature sensor OK?
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7-25
FUEL INJECTION SYSTEMFI
Atmospheric pressure sensor
output voltage
3.75
4.25 V Tester positive probe
pink
Tester negative probe
black / blue
1
2
Fault code No.23SymptomOpen or short circuit detected from the atmospheric pressure sensor.
Used diagnostic code No. 02 (atmospheric pressure sensor)
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.If there is a malfunction, repair it and connect it
securely.
Atmospheric pressure sensor coupler
Main wiring harness ECU couplerReinstated by
turning the
main switch
ON.
2Open or short circuit in wiring harness.Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
Blue – Blue
Black / Blue – Black / Blue
Pink – Pink
3Defective atmospheric pressure sensor.Execute the diagnostic mode (Code No.02).
Replace if defective.
1. Connect the pocket tester (DC 20 V) to the
atmospheric pressure sensor coupler terminal
as shown.
2. Set the main switch to “ON”.
3. Measure the atmospheric pressure sensor out-
put voltage.
4. Is the atmospheric pressure sensor OK?
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7-26
FUEL INJECTION SYSTEMFI
Tester positive prove
blue
Tester negative prove
yellow / green1
2
Fault code No.30SymptomThe motorcycle has overturned.
Used diagnostic code No. 08 (lean angle cut-off switch)
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1The motorcycle has overturned.Raise the motorcycle upright.Reinstated by
2Installed condition of the lean angle
cut-off switchCheck the installed area for looseness or
pinching.turning the
main switch
ON3Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.If there is a malfunction, repair it and connect it
securely.
Lean angle cut-off switch coupler
Main wiring harness ECU couplerON
(however, the
engine cannot
be restarted
unless the
main switch is
4Defective lean angle cut-off switchExecute the diagnostic mode (Code No.08).
Replace if defective.
1. Remove the lean angle cut-off switch from the
motorcycle.
2. Connect the lean angle cut-off switch coupler
to the wireharness.
3. Connect the pocket tester (DC 20 V) to the
emergency stop switch coupler as shown.
4. When turn the lean angle cut-off switch
approx. 65, the voltage reading is 0.4 V to 4.4
V.
5. Is the emergency stop switch OK?
main switch is
first turned
OFF).
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