sensor YAMAHA YZF-R7 1999 User Guide

6 - 1
EFI

ELECTRONIC FUEL INJECTION
ELECTRONIC FUEL INJECTION
ELECTRONIC FUEL INJECTION
Order Job/Part Q’ty Remarks
Removing the injector 2 assembly
and air filter case
Remove the parts in the order listed.
Air filter case cover Refer to “FUEL TANK AND AIR FIL-
TER” in chapter 3.
1 Crankcase breather hose 1 Disconnect.
2 Fuel hose 3
3 Injector 2 sub-lead coupler 3 Disconnect.
4 Pressure sensor hose 2 Disconnect.
5 Plastic band 1
6 Injector 2 assembly 1
7 Spacer 6
8 Air funnel 4
9 Air funnel bracket 4
10 Fuel hose joint pipe 1
6

6 - 2
EFI

ELECTRONIC FUEL INJECTION
Order Job/Part Q’ty Remarks
11 Intake air temperature sensor 1
12 Copper washer 1
13 Air filter case breather hose 1 Disconnect.
14 Negative pressure hose 1 Disconnect.
15 Air funnel rubber seat 4
16 Air filter case 1
For installation, reverse the removal
procedure.
6

6 - 3
EFI

T R..30 Nm (3.0 m • kg, 22 ft • Ib)
T R..8 Nm (0.8 m • kg, 5.8 ft • Ib)
T R..5 Nm (0.5 m • kg, 3.6 ft • Ib)
T R..8 Nm (0.8 m • kg, 5.8 ft • Ib)
(4)
1
2
3
4
5 6
7
10
9 8
11
2012
14
11
12
13
15
19
16
18
17
LTLT
LTLT
LTLT

ELECTRONIC FUEL INJECTION
Order Job/Part Q’ty Remarks
Removing the injector 2
Remove the parts in the order listed.
1 Intake air pressure sensor coupler 1
2 Atmospheric pressure sensor cou-
pler1
3 Cylinder #1 – injector 2 coupler 1
4 Cylinder #2 – injector 2 coupler 1
5 Cylinder #3 – injector 2 coupler 1
6 Cylinder #4 – injector 2 coupler 1
7 Pressure sensor hose 2
8 Intake air pressure sensor 1
9 Atmospheric pressure sensor 1
10 Pressure sensor bracket 1
11 Union bolt 2
12 Washer 4

6 - 5
EFI

ELECTRONIC FUEL INJECTION
Order Job/Part Q’ty Remarks
Removing the throttle body assem-
bly
Remove the parts in the order listed.
1 Fuel hose 1
2 Throttle position sensor coupler 1
3 Cylinder #4 – injector 1 coupler 1
4 Cylinder #3 – injector 1 coupler 1
5 Cylinder #2 – injector 1 coupler 1
6 Cylinder #1 – injector 1 coupler 1
7 Starter cable 1 Disconnect.
8 Throttle cable 2 Disconnect.
9 Throttle stop screw 1 Disconnect.
10 Throttle body assembly 1
11 Left plate 4
12 Right plate 4

6 - 8
EFI

ELECTRONIC FUEL INJECTION
Order Job/Part Q’ty Remarks
14 Throttle position sensor 1
15 Throttle cable holder 1
16 Starter link lever screw 4
17 Starter link 1
18 Starter link lever 4
19 Front connecting plate 1
20 Throttle body 4
21 Starter plunger 4
22 Air screw 4
For installation, reverse the removal
procedure.

6 - 10
EFI

ELECTRONIC FUEL INJECTION
CHECKING THE PRESSURE REGULATOR
1. Check:
• pressure regulator
Damage
®
Replace.
EAS00502
CHECKING AND ADJUSTING THE
THROTTLE POSITION SENSOR
NOTE:

Before adjusting the throttle position
sensor, the engine idling speed should
be properly adjusted.
1. Check:
• throttle position sensor
(installed on the throttle body)
t t t t t t t t t t t t t t t t t t t t t t t t t t t
a. Disconnect the throttle position sen-
sor coupler from the throttle position
sensor.
b. Connect the pocket tester (
W

´
1k) to
the throttle position sensor.
c. Measure the maximum throttle posi-
tion sensor resistance.
Out of specification
®
Replace the
throttle position sensor.
Positive tester probe
®

blue terminal
1
Negative tester probe
®

black/blue terminal
2
Maximum throttle position
sensor resistance
4.0 ~ 6.0 k
W
at 20 ˚C (68 ˚F)
(blue — black/blue)
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6 - 11
EFI

ELECTRONIC FUEL INJECTION
d. Connect the pocket tester (
W

´
1k) to
the throttle position sensor.
e. While slowly opening the throttle,
check that the throttle position sensor
resistance is within the specified
range.
NOTE:

Check mainly that the resistance
changes gradually when turning the
throttle, since the readings (from closed
to wide-open throttle) may differ slightly
from those specified.
Out of specification or the resistance
changes abruptly
®
Go to step 2
below.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
Positive tester probe
®

yellow terminal
3
Negative tester probe
®

black/blue terminal
2
Throttle position sensor resis-
tance
(520 ~ 900
W
) ~ (4.0 ~ 6.0 k
W
)
at 20 ˚C (68 ˚F)
(yellow — black/blue)
2. Check:
• throttle position sensor
(removed from the throttle body)
t t t t t t t t t t t t t t t t t t t t t t t t t t t
a. Disconnect the throttle position sen-
sor coupler from the throttle position
sensor.
b. Remove the throttle position sensor
from the throttle body.
c. Connect the pocket tester (
W

´
1k) to
the throttle position sensor.
Positive tester probe
®

blue terminal
1
Negative tester probe
®

black/blue terminal
2
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EFI

ELECTRONIC FUEL INJECTION
d. Measure the maximum throttle posi-
tion sensor resistance.
Out of specification
®
Replace the
throttle position sensor.
e. Connect the pocket tester (
W

´
1k) to
the throttle position sensor.
f. While slowly opening the throttle,
check that the throttle position sensor
resistance is within 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.
NOTE:

Check mainly that the resistance
changes gradually when turning the
throttle, since the readings (from closed
to wide-open throttle) may differ slightly
from those specified.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
Maximum throttle position
sensor resistance
4.0 ~ 6.0 k
W
at 20 ˚C (68 ˚F)
(blue — black/blue)
Positive tester probe
®

yellow terminal
3
Negative tester probe ®
black/blue terminal 2
Throttle position sensor resis-
tance
0 ~ 5 ± 1.0 kW at 20 ˚C (68 ˚F)
(yellow — black/blue)

6 - 13
EFIELECTRONIC FUEL INJECTION
3. Adjust:
• throttle position sensor angle
t t t t t t t t t t t t t t t t t t t t t t t t t t t
a. Disconnect the throttle position sen-
sor coupler from the throttle position
sensor.
b. Connect the pocket tester (W ´ 1k) to
the throttle position sensor.
c. Measure the throttle position sensor
maximum resistance.
d. Calculate the throttle position sensor
maximum resistance when the throt-
tle is fully closed.
Example:
If the maximum resistance = 5 kW, then
the throttle position sensor’s maximum
resistance when the throttle is fully
closed should be:
5 kW ´ (0.13 ~ 0.15) = 650 ~ 750 W
Lift the throttle body assembly slightly
out of the intake manifolds.
Loosen the throttle position sensor
screws 4.
Connect the pocket tester (W ´ 100) to
the throttle position sensor.
e. Adjust the throttle position sensor
angle so that the measured resistance
is within the specified range.
After adjusting the throttle position sen-
sor angle, tighten the throttle position
sensor screws.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
Positive tester probe ®
blue terminal 1
Negative tester probe ®
black/blue terminal 2
Throttle position sensor maximum
resistance (throttle is fully closed) =
Maximum resistance ´ (0.13 ~ 0.15)
Positive tester probe ®
yellow terminal 3
Negative tester probe ®
black/blue terminal 2
Throttle position sensor resis-
tance
650 ~ 750 W
(yellow — black/blue)
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4

4

8 - 1
–+ELEC

ELECTRICAL COMPONENTS
EB800000
ELECTRICAL
ELECTRICAL COMPONENTS
1
Wire harness
2
Main switch
3
Front brake light switch
4
Ignition coils
5
Clutch switch
6
Throttle position sensor
7
Intake air temperature sensor
8
Intake air pressure sensor
9
Atmospheric pressure sensor
0
Turn signal relay
A
Relay unit
B
ECU
C
CDI unit
D
Fuse box
E
Fall detection switch
F
Starter relay
G
Main fuse
H
Main relay
I
Battery
J
Rectifier/regulator
K
Rear brake light switch
L
Neutral switch
M
Speed sensor
N
Sidestand switch
O
Stator coil assembly
P
Oil level switch
Q
Pickup coil
R
Radiator fan
S
Horn
T
Coolant temperature
sender
U
Thermo switch
V
Camshaft sensor
8