1999 YAMAHA YZF-R7 ad blue

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)
B/LYL
231

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
B/LYL
231

6 - 12
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)
B/LYL
231
4

4

8 - 2
–+ELEC

SWITCHES
EB801000
SWITCHES
CHECKING SWITCH CONTINUITY
Check each switch for continuity with the
pocket tester. If the continuity reading is
incorrect, check the wiring connections and
if necessary, replace the switch.
CAUTION:

Never insert the tester probes into the cou-
pler terminal slots
1
. Always insert the
probes from the opposite end of the cou-
pler, taking care not to loosen or damage
the leads.
NOTE:

• Before checking for continuity, set the
pocket tester to “0” and to the “
W

´
1”
range.
• When checking for continuity, switch back
and forth between the switch positions a
few times.
The terminal connections for switches (e.g.,
main switch, engine stop switch) are shown
in an illustration similar to the one on the
left.
The switch positions
a
are shown in the far
left column and the switch lead colors
b
are shown in the top row in the switch illus-
tration.
NOTE:

“ ” indicates a continuity of electric-
ity between switch terminals (i.e., a closed
circuit at the respective switch position).
The example illustration on the left shows
that:
There is continuity between blue/red and
red when the switch is set to “ ”.
There is continuity between blue/red and
blue, between brown/blue and red, and
between blue/yellow and blue/black when
the switch is set to “ON”.
Pocket tester
90890-03112
ONR
Br/LL/YL/B
OFF
ab
Br/L
L/B R
L/Y

8

8 - 3
–+ELEC

CHECKING THE SWITCHES
EB801010
CHECKING THE SWITCHES
Check each switch for damage or wear, proper connections, and also for continuity between
the terminals. Refer to “CHECKING SWITCH CONTINUITY”.
Damage/wear
® Repair or replace the switch.
Improperly connected ® Properly connect.
Incorrect continuity reading ® Replace the switch.
1Main switch
2Light switch
3Pass switch
4Dimmer switch
5Turn signal switch6Horn switch
7Clutch switch
8Engine stop switch
9Start switch
0Front brake light switchAOil level switch
BRear brake light switch
CFuse
DNeutral switch
ESidestand switch
1L/YL/B
LL/R
R
Br/L
OFF
ONP
L/RLBr/LRL/YL/B
3
4
5
Br/WR/YPLB
Dg Y
G Ch
B/YL/YPASS—
R/YY
67
YG
—BP
(BLUE)
(BLACK)
(BLACK)
R/WBr
R/BB
G/YL/W
B
B
G/YBr
OFF
ChBr/WDg
8R/WR/B
9
0—L/WB
2R/YL•
C
E
(BLUE)
B
B
B D
(BROWN)
Sb
A
W
L/YB/Y
L/YB/Y

8 - 7
–+ELECIGNITION SYSTEM
EB802001
IGNITION SYSTEM
CIRCUIT DIAGRAM
B
(BLACK) (DARK GRAY)
(BLACK)B
L
B
L
K
WWW
86
7RR
Br
BBRR
L/W BrL/W
RR
R
B
B
BBB
B
R
WWW(BLACK)
L/W
B
R/B
R/L
G/B
R/L
L/W
B (BLUE)
Gy
Gy/B
B
B(BLUE)
Gy
B
Br
G
L/R
B
Br
G L/R
B
Br/W
Br
B
B
B
B
L/WBr
R/W
G/Y R/W
B/WB/L(GRAY)
(BROWN)
h
Br
YB
BBr
Y (BROWN) (BROWN)
R/YLBr/WP
B(BLUE) (BLUE)(BLACK) (BLACK)
Br
BBR/WR/B
Y
P
ON OFF
R
RL/R
LBr/L
B
R/L
G/W(BLACK)
R/L R/BR/G L/R(GREEN)
(BLACK) (BLACK)(BLACK)(BLACK)
O Gy
B
Br/G
B Br
L/G W/G
Y/G
BYL
B
B
G
Ch Dg
BL/W
L/R
R/BB/Y
L/YSb
R/L R/B
Br/WB1G/W B/L
L/Y
W
B/L
W/B L/YB/L
W/YL/Y
L/Y
Br L
R
Br/LR
Br/L
L/W
L/Y
Br
L/W
L/Y L/B
L L/R
B L/Y
L/R LB B BB
W
WW
W
WW
B
BB
B
B B1
B
BB
B
B
B/YL/Y
B/YL/Y
R/Y
L P
B Br/WDg
ChB/YYG
L/Y
Ch
B/YDg
G
L/YY
B
R
G
B/L
YLWBYPBL
GBB/W
(BLACK)YB
BCh
(BLACK)BDg
B
(GRAY)(BLACK)
(BLACK)
(BLACK) (GRAY)
(GRAY)
(GRAY)
(GRAY) (GRAY)B/W B/L
B/L B/L
W/LP/B Y/L
R
B
PASS
(BLACK)
(BLACK)ChB
(BLACK)DgB
N
B(BLACK)B
(BLACK) (BLACK)
O/G B(BLACK) (BLACK)
L
R/L G/B
M
R/L L/B
N
R/LR/L O/B
OY
Y/R C YG/R C GBr/R C BrGy/R C Gy
R R/LRRRRY
P
RG G(BROWN)
Q
RBr Br
Gy(DARK GRAY)R(GRAY)
R
R/YLg/Y
R/Y Lg/Y R/WB/L
R/Y
R
Y/L
B
L/R
YL/R
Gy/B
Gy
G/WB1
W/Y
W1
L/R B/L
YLW/B
Y/L W/L
P/W P/LR/Y
Br/W R/W
Lg/YL/W B/W
R/L
R/B L/WW G
Lg
L/R L/BSb
B/Y B B/R L/Y
RBR
R/G
4
BL/Y
BB
Br/L
BrBrL
B
B
B
B
BR/GB1
B
Y
B
R/WR/B
R/GR/BL/RR/L
Br
G/WR/L
L/YW/BB/L
GyGy/B
R/L
L/R
L/W
B/LL
B
Br/W
Br
Y
LPWP
B2
B2
R PB
(BLACK)
B3
B3W2
Y/G L/GBr/G Br/R
Gy/R
BrBrO/B
G/Y L/B G/B G/R
Y/R
W/G Y/B R/B
O/B
R/L
L/B
GyO
O Lg/R
B
B
B
BB Gy
Gy/G Gy/G Gy/G
O/G O/GO/G
Gy GyGy/G
Br/G
W/G
Y/G
L/G
Br
WW/YB/L
L/Y
Lg/RG/Y W/YL/R
Y/B
L/YBSb
Sb
R/GG/WWYChL
W
BrP
P G Y Ch Dg B
Dg
B
BBBB
B
Dg
ChBr
LR/Y
L/Y B/Y
Br/LBr/LBr/L
BrR/YR/W
B2
Gy/BB3
R/B
G/B
L/B
O/B
Gy/R
Lg/RY/R
G/R
Br/R
R/W
R/Y
Lg/Y
W1
W2
(BLACK)
(BLACK)
(BLACK)
(BLACK) (GRAY)
B
L
B
B/L
Br/W
B/LG/W
S
T
U
V W J
Z
R/G
B L/Y
W/YG/Y W Y/B
Br
G/WLg/R Lg Y
ChDg
L
gf f e dc b a` ] \[ FE DC
I
G
H
X
j k
l
m
n
op
i w v u

t s
r qBA@Br9 5 3 2
1
Œ

 
£¢ ¤
¥
¦xy

(BLACK)
Y
L/W
Y/B
G/Y
Y/L
W/L
P/BR
B3 W/B
B/L
L
Y
P/W
P/L
Br
G/W
B/W
W/Y
Br
B2
|
~
z } {
L/Y
A
A
A
A
AA
AAAA
A C
A
A
A
A A
A
P/LP/W
BB/L BB/L
DL DL
C
W/LP/B
WIRE HARNESS SUB LEAD
B/L B/L
BB
R/L R/L L
R/L R/L L
LRR
LR
R(GRAY)
(GRAY)
WIRE HARNESS SUB LEADY/R
Br/RP/W
G/R Gy/R P/L
WYBr
PG
Gy(BLACK)
(BLACK)
WIRE HARNESS SUB LEAD HEADLIGHT AND METER SUB-WIRE HARNESS
(BLACK)
(BLACK)
WIRE HARNESS
Y W/Y G/WG/W
R/G L G/Y Dg
Br
GY
G L/YW/Y
L/Y BBr
B W Y/B Lg Lg/RCh L/R
L/R
G/Y
R/GDg
L
Lg/R
Lg
W
Y/B ChA
BC
D
D R/L D R/L D R/L D
R
B1
Br/G
W/G
Y/G
L/G
Br
Gy
TCylinder #2-ignition coil
UCylinder #3-ignition coil
VCylinder #4-ignition coil
WCDI unit
ZNeutral switch
}Engine stop switch
£ECU fuse
1Main switch
5Battery
6Main switch
0Relay unit
ADiode
BSidestand switch
JECU
SCylinder #1-ignition coil

8 - 11
–+ELEC
CHECKING THE DIODE
• Remove the diode from the coupler.
• Connect the pocket tester (W ´ 1) to the
diode as shown.
• Check the diode for continuity.
NOTE:
When you switch the tester’s positive and
negative probes, the readings in the above
chart will be reversed.
• Are the tester readings correct?
Yes ® Good.
No ® Replace. Tester positive probe ®
blue/white 1
Tester negative probe ®
blue/yellow 2Continu-
ity
Tester positive probe ®
blue/yellow 2
Tester negative probe ®
blue/white 1No conti-
nuity
L/W
L/Y
1
2
CHECKING THE RELAY UNIT
• Remove the relay unit from the coupler.
• Connect the pocket tester (W ´ 1) to the
relay unit terminals as shown.
• Check the starting circuit cutoff relay for
continuity.
NOTE:
When you switch the tester’s positive and
negative probes, the readings in the above
chart will be reversed.
• Are the tester readings correct?
Yes ® Good.
No ® Replace. Tester positive probe ®
sky blue 1
Tester negative probe ®
blue/yellow 2Continu-
ity
Tester positive probe ®
blue/yellow 2
Tester negative probe ®
sky blue 1No conti-
nuity
R/B L/WW G
Lg
L/R L/BSbB/Y B B/R L/Y
21
IGNITION SYSTEM