stop start YAMAHA YZF-R7 1999 User Guide

3 - 20
CHK
ADJCHECKING THE SPARK PLUGS/
MEASURING THE COMPRESSION PRESSURE
5. Check:
• electrodes 1
Damage/wear ® Replace the spark
plug.
• insulator 2
Abnormal color ® Replace the spark
plug.
Normal color is medium-to-light tan.
6. Clean:
• spark plug
(with a spark plug cleaner or wire
brush)
7. Measure:
• spark plug gap a
(with a wire gauge)
Out of specification ® Regap.
8. Install:
• spark plug
NOTE:
Before installing the spark plug, clean
the spark plug and gasket surface.
Spark plug gap
0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
T R..13 Nm (1.3 m · kg, 9.4 ft · lb)
EB303060
MEASURING THE COMPRESSION
PRESSURE
The following procedure applies to all of
the cylinders.
NOTE:
Insufficient compression pressure will
result in a loss of performance.
1. Measure:
• valve clearance
Out of specification ® Adjust.
Refer to “ADJUSTING THE VALVE
CLEARANCE”.
2. Start the engine, warm it up for several
minutes, and then stop it.

3 - 23
CHK
ADJ
CHECKING THE ENGINE OIL LEVEL
EB303070
CHECKING THE ENGINE OIL LEVEL
1. Stand the motorcycle on a level surface.
NOTE:
• Place the motorcycle on a suitable stand.
• Make sure that the motorcycle is
upright.
2. Start the engine, let it idle for several
minutes, and then stop it.
3. Check:
• engine oil level
The engine oil level should be between
the minimum level mark a and maxi-
mum level mark b.
Below the minimum level mark ® Add
the recommended engine oil to the
proper level.
Recommended oil
Refer to the chart for the
engine oil grade which is best
suited for certain atmo-
spheric temperatures.
API standard
SE or higher grade
(Non-Friction modified)
ACHTUNG:CAUTION:
• Engine oil also lubricates the clutch
and the wrong oil types or additives
could cause clutch slippage. There-
fore, do not add any chemical addi-
tives or use engine oils with a grade of
CD c or higher and do not use oils
labeled “ENERGY CONSERVING II” d
or higher.
• Do not allow foreign materials to
enter the crankcase.
4. Start the engine, warm it up for several
minutes, and then turn it off.
5. Check:
• engine oil level
NOTE:
Before checking the engine oil level,
wait a few minutes until the oil has set-
tled.

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

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 - 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
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
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 - 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 - 33
–+ELECELECTRICAL CONTROL SYSTEM
DIAGNOSIS MODE
There are two operation methods for this mode: one is performed using the CO, diagnosis
switch box, the other is performed using the test coupler adapter. With the CO, diagnosis
switch box method, the switches on the CO, diagnosis switch box are used. With the test cou-
pler adapter method, the start switch and the engine stop switch are used. The procedures for
selecting and using each method is explained below.
NOTE:
The engine cannot be started, the vehicle cannot be ridden, and no other mode can be
selected while either of the diagnosis mode operation methods is being performed.
CO, diagnosis switch box method
• Remove the bottom cowling and the front
cowling.
Refer to “COWLINGS” in chapter 3.
• Remove the protection cap 1 from the EFI
test coupler 2.
• Connect the CO, diagnosis switch box 3
to the EFI test coupler 2.
• Turn the main switch to “ON”.
• Turn the engine stop switch to “ ”.
• Within 4 seconds, press the following
switches on the CO, diagnosis switch box
in the order indicated to enter the diagno-
sis mode.
4MODE switch = 1
5UP switch = 2
6DOWN switch = 3
1 ® 2 ® 1 ® 3 ® 1 ® 2 ® 1 ® 3 ® 1 ® 2 ®
1 ® 3
The warning light flashes when the unit has
entered the diagnosis mode.
NOTE:
Turn the main switch to “OFF” to cancel the
diagnosis mode.
CO, diagnosis switch box
90890-03171

8 - 35
–+ELECELECTRICAL CONTROL SYSTEM
Test coupler adapter method
• Remove the bottom cowling and the front
cowling.
Refer to “COWLINGS” in chapter 3.
• Remove the protection cap 1 from the EFI
test coupler 2.
• Connect the test coupler adapter 3 to the
EFI test coupler 2.
• Disconnect the fuel pump coupler from
the wire harness.
• Turn the main switch to “ON”.
• Turn the engine stop switch to “ ”.
• Press the start switch ten times within 4
seconds to enter the diagnosis mode.
The warning light flashes when the unit
has entered the diagnosis mode.
NOTE:
Turn the main switch to “OFF” to cancel the
diagnosis mode.
Operation after entering the diagnosis
mode
• Select a diagnosis code by pressing the
start switch. Refer to the diagnosis code
list.
First, press the start switch once to select
diagnosis code 01. Afterwards, each press
of the start switch increases the diagnosis
code number by one. If diagnosis code 31
is selected, pressing the start switch once
selects diagnosis code 00.
• Turn the engine stop switch to “ ” to
start the test for the selected diagnosis
code.
NOTE:
To select another diagnosis code, turn the
engine stop switch to “ ”, and then press
the start switch.
Example:
First, select diagnosis code 29 as follows.
• Turn the engine stop switch to “ ”.
• Press the start switch 29 times.
• Turn the engine stop switch to “ ”.
Next, select diagnosis code 10 as follows.
• Turn the engine stop switch to “ ”.
• Press the start switch 13 times.
• Turn the engine stop switch to “ ”.
Test coupler adapter
90890-03149

8 - 38
–+ELECELECTRICAL CONTROL SYSTEM
17 Injector 1 for cyl-
inder #1CO, diagnosis switch box method
Before selecting a code, discon-
nect the fuel pump coupler from
the wire harness.
Within one second after the
MODE switch is released, the
main relay is turned on, and the
selected injector 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.
Test coupler adapter method
Within one second after the
engine stop switch is turned to
“ ”, the selected injector is
operated for once every second
for the next five seconds. During
this time, the warning light lights
up for 0.5 second once every sec-
ond. 18 Injector 1 for cyl-
inder #2
19 Injector 1 for cyl-
inder #3
20 Injector 1 for cyl-
inder #4
21 Injector 2 for cyl-
inder #1
22 Injector 2 for cyl-
inder #2
23 Injector 2 for cyl-
inder #3
24 Injector 2 for cyl-
inder #4
25 ~ 28 — — —
29 Condition code
record of mal-
functionsThe condition code of any fixed mal-
function is recorded in the ROM and
displayed by the tachometer. Refer
to the condition code list in “USER
MODE” for details on the condition
codes.Condition codes 11
– 44
30 ROM (Clearing
the condition
code record)Selecting this diagnosis code clears
the condition code record of mal-
functions stored in the ROM.
If an error has occurred in a sensor
signal, it was recorded in the ROM
and the tachometer displays 10,000
r/min. If no error has occurred, the
tachometer displays 0 r/min.
CO, diagnosis switch box method
Press the UP switch eight times
within four seconds to clear the con-
dition code record from the ROM.
Test coupler adapter method
Remove the rear cowling.
Disconnect the relay unit coupler
from the relay unit.
Press the start switch ten times
within four seconds to clear the con-
dition code record from the ROM.0 r/min (no error) or
10,000 r/min (errors)
When the error
record is cleared, 0
r/min is displayed.
31 ROM program
versionThe version number of the ROM pro-
gram is displayed in the tachometer. Diagnosis
codeInspected item System responseTachometer display
(0 ~ 10,000 r/min)