ECU YAMAHA YZF-R7 1999 Owner's Manual

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
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op
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1
Œ

 
£¢ ¤
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¦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 - 8
–+ELECIGNITION SYSTEM
TROUBLESHOOTING
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
No good
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK The ignition system fails to operate (no spark or intermittent spark).
Check the main and ECU fuses for
continuity.Replace.
Check the condition of the bat-
tery.Recharge or replace.
Check the spark plug. Re-gap or replace.
Measure the ignition spark gap. Ignition system is OK.
Measure the ignition coil resis-
tance.Replace.
Measure the pickup coil resis-
tance.Replace.
Check the main switch. Replace.
Check the engine stop switch.Replace the right handlebar
switch.
Check the neutral switch. Replace.
Check the diode. Replace.
Check the sidestand switch. Replace.
Check the relay unit. Replace.
Check the entire ignition sys-
tem’s wiring.Repair or replace.
Replace the CDI unit.
No good
No good
No good
No good
No good
No good
No good
No good
No good
OK
No good
No good
No good

8 - 9
–+ELECIGNITION SYSTEM
BAD
NOTE:
• Before troubleshooting, remove the following part(-s):
1) fuel tank
2) air filter case
3) bottom cowling
4) front cowling
5) rear cowling
• Troubleshoot with the following special tool(-s).
Replace the ECU.
Ignition checker
90890-06754
Pocket tester
90890-03112
MEASURING THE IGNITION SPARK GAP
The following procedure applies to all of
the spark plugs.
• Disconnect the ignition coil from the spark
plug.
• Connect the ignition checker 1 as shown.
2 Ignition coil
• Set the main switch to “ON”.
• Measure the ignition spark gap a.
• Crank the engine by pushing the start
switch and gradually increase the spark
gap until a misfire occurs.
• Is there a spark and is the spark gap
within specification?
Yes ® Good.
No ® Measure the ignition coil resistance.
Minimum ignition spark gap
6 mm (0.24 in)

8 - 12
–+ELECELECTRIC STARTING SYSTEM
EB803000
ELECTRIC STARTING 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
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
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
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£¢ ¤
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¦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
BBB2
GyBSidestand switch
JECU
ZNeutral switch
rClutch switch
}Engine stop switch
~Start switch
£ECU fuse
1Main switch
5Battery
6Main fuse
7Starter relay
8Starter motor
9Diode
0Relay unit
ADiode

8 - 13
–+ELECELECTRIC STARTING SYSTEM
TROUBLESHOOTING
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK
C0NTINUITYOK The starter motor fails to turn.
Check the main and ECU fuses for
continuity.Replace.
Check the condition of the bat-
tery.Recharge or replace.
Check the starter motor. Repair or replace.
Check the relay unit. Replace.
Check the starter relay. Replace.
Check the diodes. Replace.
Check the main switch. Replace.
Check the engine stop switch.Replace the right handlebar
switch.
Check the neutral switch. Replace.
Check the sidestand switch. Replace.
Check the clutch switch. Replace.
Check the start switch.Replace the right handlebar
switch.
Check the entire starting sys-
tem’s wiring.Repair or replace.
No good
No good
No good
No good
No good
No good
No good
No good
No good
No good
No good
No good
No good

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 - 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.

YZF-R7 WIRING DIAGRAM
1
Main switch

2
Rectifier/regulator

3
Generator

4
Backup fuse (odometer)

5
Battery

6
Main fuse

7
Starter relay

8
Starter motor

9
Diode

0
Relay unit

A
Diode

B
Sidestand switch

C
Camshaft sensor

D
Throttle position sensor

E
Intake air pressure sensor

F
Atmospheric pressure sensor

G
Intake air temperature sensor

H
Coolant temperature sensor

I
Pickup coil

J
ECU

K
Cylinder #1 - injector 1

L
Cylinder #2 - injector 1

M
Cylinder #3 - injector 1

N
Cylinder #4 - injector 1

O
Cylinder #1 - injector 2

P
Cylinder #2 - injector 2

Q
Cylinder #3 - injector 2

R
Cylinder #4 - injector 2

S
Cylinder #1 - ignition coil

T
Cylinder #2 - ignition coil

U
Cylinder #3 - ignition coil

V
Cylinder #4 - ignition coil

W
CDI unit

X
Fall detection switch

Y
Speed sensor

Z
Neutral switch

[
Meter assembly

\
Fuel level indicator light

]
Warning light (oil level indicator)

^
Neutral indicator light

a
Tachometer

b
Combination meter

c
Warning light (coolant temperature indicator)
d
High beam indicator light
e
Turn signal indicator light
f
Meter light
gWarning light (engine trouble indicator)
hOil level switch
i
Horn
jHeadlight
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
q
Left handlebar switch
rClutch switch
sLights switch
t
Pass switch
uDimmer switch
vTurn signal switch
wHorn switch
xTurn signal relay
yFuel pump
zMain relay
{
Right handlebar switch|Front brake light switch
}Engine stop switch
~Start switch
Œ
Electronic fuel injection system fuseCYCLELOCK Signaling system fuse
¢Headlight fuse£
ECU fuse¤Radiator fan motor fuse
¥Thermo switch
¦Radiator fan motor
COLOR CODE
B ............ black
Br ........... brown
Ch .......... chocolate
Dg .......... dark green
G ............ green
Gy .......... gray
L ............ blue
Lg .......... light green
O ............ orange
P ............ pink
R ............ red
Sb .......... sky blue
W ........... white
Y ............ yellow
B/L ......... black/blue
B/R ......... black/red
B/W ....... black/white
B/Y ......... black/yellow
Br/G ....... brown/green
Br/L ........ brown/blue
Br/R ....... brown/red
Br/W ...... brown/white
G/B ........ green/black
G/R ........ green/red
G/W ....... green/white
G/Y ........ green/yellow
Gy/B ...... gray/black
Gy/G ...... gray/green
Gy/R ...... gray/red
L/B ......... blue/black
L/G ......... blue/green
L/R ......... blue/red
L/W ........ blue/white
L/Y ......... blue/yellow
Lg/R ....... light green/red
Lg/Y ....... light green/yellow
O/B ........ orange/black
O/G ........ orange/green
P/B ......... pink/black
P/L ......... pink/blue
P/W ........ pink/white
R/B ......... red/black
R/G ........ red/green
R/L ......... red/blue
R/W ....... red/white
R/Y ......... red/yellow
W/B ....... white/black
W/G ....... white/green
W/L ........ white/blue
W/Y ....... white/yellow
Y/B ......... yellow/black
Y/G ........ yellow/green
Y/L ......... yellow/blue
Y/R ......... yellow/rod