1999 YAMAHA YZF-R7 relay

8 - 15
–+ELECELECTRIC STARTING SYSTEM
CHECKING THE STARTER RELAY
• Disconnect the starter relay from the cou-
pler.
• Connect the pocket tester (W ´ 1) and bat-
tery (12 V) to the starter relay coupler as
shown.
• Does the starter relay have continuity
between red and black?
Yes ® Good.
No ® Replace. Battery positive terminal ® brown 1
Battery negative terminal ®
blue/white 2
Tester positive probe ® red 3
Tester negative probe ® black 4
CHECKING THE DIODES
• Remove the diodes from the couplers.
• Connect the pocket tester (W ´ 1) to the
diode as show.
• Check the diodes 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 the defective diode(-s). Tester positive probe ®
brown 1
Tester negative probe ®
blue/white 2
Continu-
ity
Tester positive probe ®
blue/white 3
Tester negative probe ®
blue/yellow 4
Tester positive probe ®
blue/white 2
Tester negative probe ®
brown 1
No conti-
nuity
Tester positive probe ®
blue/yellow 4
Tester negative probe ®
blue/white 3
Br
L/W
1
2
L/W
L/Y
3
4

8 - 21
–+ELECSIGNALING SYSTEM
EB806000
SIGNALING 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/YY/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
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
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G
H
X
j k
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op
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1
Œ

 
£¢ ¤
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(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
L/R
1Main switch
5Battery
6Main fuse
0Relay unit
ZNeutral switch
\Fuel level indicator light
]Warning light (oil level indicator)
^Neutral indicator light
aTachometer
bCombination meter
eTurn signal indicator light
hOil level switch
iHorn
kRear turn signal light (right)
lRear turn signal light (left)
mFront turn signal light (right)
nFront turn signal light (left)
oTail/brake light
pRear brake light switch
vTurn signal switch
wHorn switch
xTurn signal relay
yFuel pump (thermistor)
|Front brake light switch
 Signaling system fuse

8 - 22
–+ELECSIGNALING SYSTEM
TROUBLE SHOOTING
• Any of the following fail to light: turn signal light, brake light or an indicator light.
• The horn fails to sound.
Check the main and signal system fuses
continuity.
Check the condition of the battery.
Check the main switch.
Check the entire signaling system’s wiring.
Check the bulbs and
bulb sockets.
Check the LED’s of
the indicator light.
Check the brake
switchs.
Replace the meter
assembly.
Check the neutral
switch.
Replace the meter
assembly. Check the relay unit.
Check the continuity of the thermistor in the fuel pump.OK
OK
OK
OK
OK
OK
OK
OK
OK
OKNo good
No good
No good
No goodReplace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.Recharge or replace.
Recharge or replace.
No goodNo good
No good
No good
No good
No good
No good
No good No good
No good OK
OK
BAD
OK Check the horn switch.
Check the horn. Replace.
Replace. Check the turn signal
switch.
Replace the turn
signal relay.
Replace the meter
assembly.
Replace the meter
assembly.
Replace the meter
assembly.Check the oil level
switch.
Replace the fuel
pump. Replace the left
handlebar switch.
Replace the
left handlebar
switch.

8 - 23
–+ELECSIGNALING SYSTEM
NOTE:
• Before troubleshooting, remove the following part(-s):
1) fuel tank
2) bottom cowling
3) front cowling
4) rear cowling
• Troubleshoot with the following special tool(-s).
Pocket tester
90890-03112
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.
CHECKING THE OIL LEVEL SWITCH
• Drain the engine oil.
• Remove the oil level switch.
• Connect the pocket tester (W ´ 1) to the oil
level switch connector as shown.
• Check the oil level switch for continuity as
follows.
• Are the oil level switch readings correct?
Yes ® Good.
No ® Replace. Tester positive probe ®
sky blue 1
Tester negative probe ®
blue/red 2Continu-
ity
Tester positive probe ®
blue/red 2
Tester negative probe ®
sky blue 1No conti-
nuity
Tester positive probe ® white 1
Tester negative probe ® ground
Oil level switch float posi-
tion is upper .Continu-
ity
Oil level switch float posi-
tion is lower õ.No conti-
nuity
R/B L/WW G
Lg
L/R L/BSbB/Y B B/R L/Y
1 2
W
W
õ
11

8 - 29
–+ELECELECTRONIC FUEL INJECTION SYSTEM
1Main switch
5Battery
6Main fuse
CCamshaft sensor
DThrottle position sensor
EIntake air pressure sensor
FAtmospheric pressure sensor
GIntake air temperature sensor
HCoolant temperature sensor
IPickup coil
JECU
KCylinder #1-injector 1
LCylinder #2-injector 1
MCylinder #3-injector 1
NCylinder #4-injector 1
OCylinder #1-injector 2
PCylinder #2-injector 2
QCylinder #3-injector 2
RCylinder #4-injector 2
XFall detection switch
YSpeed sensor
yFuel pump
zMain relay
}Engine stop switch
ŒElectronic fuel injection system fuse
£ECU fuse
TROUBLESHOOTING
NOTE:
• Before troubleshooting, remove the following part(-s):
1) bottom cowling
2) front cowling
• Troubleshoot with the following special tool(-s).
The condition code is displayed by the tachometer.
Check the condition code list to
identify the faulty part. Refer to
“ELECTRICAL CONTROL SYS-
TEM”.
In diagnosis mode, select the
appropriate diagnosis code to
check the operation of the faulty
part.Check the
wiring.Replace.
Co, diagnosis switch box
90890-03171
Test coupler adapter
90890-03149
Out of specifi-
cationNo good

8 - 30
–+ELECELECTRICAL CONTROL SYSTEM
ELECTRICAL CONTROL SYSTEM
The YZF-R7 features an electrical control system with the following modes:
• user mode
• diagnosis mode
• CO emission adjustment mode
NOTE:
The vehicle is normally in user mode. Special tools are needed to switch to a diagnosis mode
or to the CO emission adjustment mode.
USER MODE
• If a circuit is defective, setting the main switch to “ON” (without starting the engine) will
cause the corresponding condition code to be displayed by the tachometer, the warning
light to light up, and the engine trouble symbol to blink. When the engine is started, the
condition code is no longer displayed and the engine speed appears.
• Normally, when the main switch is set to “ON”, the warning light comes on for 1.4 seconds
and then goes off. The warning light also comes on while the start switch is pushed.
• When the engine is not running, the warning light flashes once every 0.16 second if the start
switch is pushed under the following conditions.
• The fall detection switch switches off the main relay.
• Ignition is cut off by the sidestand switch.
• The injector operating voltage decreases to 3 V or less, or the main relay malfunctions.
• The pickup coil is defective.
• The fall detection switch is defective.

8 - 32
–+ELECELECTRICAL CONTROL SYSTEM
Condition code list
NOTE:
* This condition code is also displayed in the following cases:
- when the starter switch is held down for more than 4 seconds, causing the warning
light to flash
- when the ignition circuit cut-off system stops the engine or prevents it from starting
** This condition code is also displayed when the engine is operated at 5,000 r/min for at
least 30 seconds with the rear wheel at standstill.
*** This condition code is also displayed when the engine stop switch is turned to “ ”
while riding with the transmission in gear. Condition
codeCircuit Defect(s) System response
11 Camshaft sensor • No incoming sig-
nalThe ECU pairs the ignition of cyl-
inders #1 and #4 and cylinders #2
and #3. The motorcycle can be
ridden.
12* Pickup coil • No incoming sig-
nalThe motorcycle cannot be ridden.
13 Intake air pressure
sensor• Disconnected
• Short-circuitThe ECU stays set to an intake air
pressure of 760 mm Hg (29.9 in Hg).
The motorcycle can be ridden.
14 Intake air pressure
sensor hose and
negative pressure
hose• Improper connec-
tion
• Bending
15 Throttle position
sensor• Disconnected
• Short-circuitThe ECU stays set to a wide throt-
tle opening.
The motorcycle can be ridden.
16 Throttle position
sensor• Locked
21 Coolant tempera-
ture sensor• Disconnected
• Short-circuitThe ECU stays set to a coolant
temperature of 80˚C (176˚F).
The motorcycle can be ridden.
22 Intake air tempera-
ture sensor• Disconnected
• Short-circuitThe ECU stays set to an intake air
temperature of 40˚C (104˚F).
The motorcycle can be ridden.
23 Atmospheric pres-
sure sensor• Disconnected
• Short-circuitThe ECU stays set to an atmo-
spheric pressure of 760 mm Hg
(29.9 in Hg).
The motorcycle can be ridden.
41 Fall detection
switch• Disconnected The main relay stays switched off.
The motorcycle cannot be ridden.
42** Speed sensor • Incorrect signal The ECU stays set to 6th gear.
The motorcycle can be ridden.
43*** Monitored voltage • Incorrect The ECU stays set to a monitored
voltage of 12 V.
The motorcycle can be ridden.
44 ROM operation • CO emission
adjustment errorThe CO emission adjustment is
set to 0.

8 - 37
–+ELECELECTRICAL CONTROL SYSTEM
12 Main relay CO, diagnosis switch box method
Within one second after the
MODE switch is released, the
main relay is switched on once
every second for the next five
seconds. During this time, the
warning light lights up as long as
the relay is switched on.
Test coupler adapter method
Within one second after the
engine stop switch is turned to
“ ”, the main relay is switched
off, then on again. The warning
light lights up while the relay is
switched off.
13 Ignition coil for
cylinder #1CO, diagnosis switch box method
Within one second after the
MODE switch is released, the
ignition coil for the selected cylin-
der is operated once every sec-
ond for the next five seconds.
During this time, the warning
light lights up for 0.5 second
once every second.
Test coupler adapter method
Within one second after the
engine stop switch is turned to
“ ”, the ignition coil for the
selected cylinder is operated
once every second for the next
five seconds. During this time,
the warning light lights up for 0.5
second once every second. 14 Ignition coil for
cylinder #2
15 Ignition coil for
cylinder #3
16 Ignition coil for
cylinder #4 Diagnosis
codeInspected item System responseTachometer display
(0 ~ 10,000 r/min)