2004 YAMAHA YZF-R1S sensor

7-34
FUEL INJECTION SYSTEMFI
Fault code No.Er-1SymptomNo signal are received from the ECU.
Er-2SymptomNo signal are received from the ECU within the specified duration.
Er-3SymptomData from the ECU cannot be received correctly.
Er-4SymptomNon-registered data has been received from the meter.
Used diagnostic code No. – –
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.
Cylinder identification 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
Yellow / Blue – Yellow / Blue
Black / White – Black / White
3Malfunction in meterReplace the meter.
4Malfunction in ECUReplace the ECU.
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7-35
Order Job / Part Q’ty Remarks
1
2
3
4
5
6
7
8Removing the throttle bodies
Seat
Fuel tank
Air filter case
Sub-wire harness coupler
Coolant temperature sensor coupler
Thermo wax inlet hose
Thermo wax outlet hose
Idle adjust screw wire
Throttle body joint clamp
Throttle bodies
Throttle cables2
1
1
1
1
4
1
2Remove the parts in the order listed.
Refer to “SEAT” in chapter 3.
Refer to “FUEL TANK” in chapter 3.
Refer to “AIR FILTER CASE” in chapter 3.
Disconnect.
Disconnect.
Loosen.
If it loosens too much, the nut will sepa-
rate.
Disconnect.
NOTE:
THROTTLE BODIESFI
THROTTLE BODIES
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7-37
Order Job / Part Q’ty Remarks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15Removing the injectors
Throttle position sensor coupler
Sub-throttle position sensor coupler
Sub-throttle motor assembly coupler
Intake air pressure sensor coupler
Cylinder #1-injector coupler
Cylinder #2-injector coupler
Cylinder #3-injector coupler
Cylinder #4-injector coupler
Sub wire harness
Negative pressure hose
Intake air pressure sensor
Fuel distributor
Injector
Spring
Thermo wax assembly1
1
1
1
1
1
1
1
1
1
1
1
4
1
1Remove the parts in the order listed.
Disconnect.
Disconnect.
Disconnect.
Disconnect.
Disconnect.
Disconnect.
Disconnect.
Disconnect.
THROTTLE BODIESFI
INJECTORS
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7-38
THROTTLE BODIESFI
Order Job / Part Q’ty Remarks
16
17
18
19
20
21
22
23Idle adjust screw wire
Cotter pin
Washer
Link
Sub-throttle servo motor assembly
Throttle position sensor
Fuel pressure regulator
Throttle body assembly1
2
2
1
1
1
1
1
For installation, reverse the removal
procedure.
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7-41
THROTTLE BODIESFI
NOTE:
Increase the vacuum pressure

Fuel pressure is decreased
Decrease the vacuum pressure

Fuel pressure is increased
Faulty
Replace the pressure regulator.
EAS00916
CHECKING AND ADJUSTING THE
THROTTLE POSITION SENSOR
Before adjusting the throttle position sensor, the
engine idling speed should be properly ad-
justed.
1. Check:

throttle position sensor
a. Disconnect the throttle position sensor cou-
pler.
b. Remove the throttle position sensor from the
throttle body.
c. Connect the pocket tester (Ω  1k) to the
throttle position sensor.
Positive tester probe
blue terminal
1
Negative tester probe

black / blue terminal
2
d. Measure the maximum throttle position sen-
sor resistance.
Out of specification
Replace the throttle
position sensor.
Maximum throttle position
sensor resistance
4
6 kΩ at 20C (68F)
(blue – black / blue)
e. Connect the pocket tester (Ω  1k) to the
throttle position sensor.
Positive tester probe
yellow terminal
3
Negative tester probe

black / blue terminal
2
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7-42
THROTTLE BODIESFI
NOTE:
Tester positive probe

yellow terminal
Tester negative probe

black / blue terminal
1
2
f. While slowly opening the throttle, check that
the throttle position sensor resistance is with-
in the specified range.
The resistance does not change or it
changes abruptly
Replace the throttle
position sensor.
The slot is worn or broken
Replace the
throttle position sensor.
Check mainly that the resistance changes grad-
ually when turning the throttle, since the read-
ings (from closed to wide-open throttle) may dif-
fer slightly from those specified.
Throttle position sensor
resistance
0
6 kΩ at 20C (68F)
(yellow – black)
2. Adjust:

throttle position sensor angle
a. Connect the throttle position sensor coupler
to the wire harness.
b. Connect the digital circuit tester to the throttle
position sensor.
Digital circuit tester
90890-03174
c. Measure the throttle position sensor voltage.
d. Adjust the throttle position sensor angle so
the measured voltage is within the specified
range.
Throttle position sensor voltage
0.63
0.73 V
(yellow – black / blue)
e. After adjusting the throttle position sensor
angle, tighten the throttle position sensor
screws.
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7-43
THROTTLE BODIESFI
NOTE:
CHECKING AND ADJUSTING THE
SUB-THROTTLE POSITION SENSOR
1. Check:

sub-throttle position sensor
a. Disconnect the sub-throttle position sensor
coupler.
b. Remove the sub-throttle position sensor
from the sub-throttle servo motor.
c. Connect the pocket tester (Ω  1k) to the
sub-throttle position sensor.
Positive tester probe
blue terminal
1
Negative tester probe

black / blue terminal
2
d. Measure the maximum sub-throttle position
sensor resistance.
Out of specification
Replace the sub-
throttle position sensor.
Maximum sub-throttle position
sensor resistance
4
6 kΩ at 20C (68F)
(blue – black / blue)
e. Connect the pocket tester (Ω  1k) to the
sub-throttle position sensor.
Positive tester probe

green / yellow terminal
3
Negative tester probe

black / blue terminal
2
f. While slowly opening the sub-throttle worm
nut, check that the sub-throttle position sen-
sor resistance is within the specified range.
The resistance does not change or it changes
abruptly
Replace the sub-throttle position
sensor.
Check mainly that the resistance changes grad-
ually when turning the sub-throttle worm nut,
since the readings (from closed to wide-open
sub-throttle) may differ slightly from those spe-
cified.
Sub-throttle position sensor
resistance
0
6 kΩ at 20C (68F)
(black / blue – green / yellow)
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7-44
THROTTLE BODIESFI
2. Adjust:

sub-throttle position sensor full open angle
a. Turn the nut
1 of the worm shaft of the sub-
throttle counterclockwise until it contacts
with the full open stopper.
b. When the dimension of
a sections of the
throttle bodies #3 and #4 is measured with a
micrometer caliper, adjust with the adjuster
2 of the output shaft section of the sub-
throttle servo motor so that the dimension is
in a range from 24.2 to 24.6 mm (0.95 to 0.97
in).
AFront side
BRear side
Sub-throttle dimension a
24.2
24.6 mm (0.95
0.97 in)
c. After adjusting the dimension of
a sections
of the throttle bodies #3 and #4, measure the
dimension of
a sections of #1 and #2.
d. If the dimension of
a sections of the throttle
bodies #1 and #2 is different from the dimen-
sion of
a sections of the throttle bodies #3
and #4, adjust it to the same dimension as
the measurement value adjusted for the
throttle bodies #3 and #4, using the tuning
screw
3 located between the throttle bodies
#2 and #3.
3. Adjust:

primary opening
a. After performing the full open angle of the
sub-throttle position sensor, turn the nut of
the worm shaft clockwise, measure the di-
mension of
b section with a micrometer cali-
per or other device and adjust so that the di-
mension is in a range from 8.1 to 8.5 mm
(0.32 to 0.33 in).
AFront side
BRear side
Sub-throttle dimension b
8.1
8.5 mm (0.32
0.33 in)
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