1999 YAMAHA YZF-R7 Owners Manual

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–+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

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–+ELECELECTRICAL CONTROL SYSTEM
Operation after entering the diagnosis
mode
• Select a diagnosis code by holding down
the MODE switch while pressing either
the UP or DOWN switch. Refer to the diag-
nosis code list.
First, press the UP switch once to select
diagnosis code 01 or press the DOWN
switch once to select diagnosis code 31.
Afterwards, each press of the UP switch
or the DOWN switch respectively
increases or decreases the diagnosis code
number by one. If diagnosis code 00 is
selected, pressing the DOWN switch once
selects diagnosis code 31. If diagnosis
code 31 is selected, pressing the UP
switch once selects diagnosis code 00.
• Release the MODE switch to start the test
for the selected diagnosis code.
NOTE:
To select another diagnosis code, hold
down the MODE switch and press either the
UP switch or the DOWN switch.
Example:
First, select diagnosis code 29 in either of
the following ways.
• Hold down the MODE switch, press the
UP switch 29 times, and then release the
MODE switch.
• Hold down the MODE switch, press the
DOWN switch 3 times, and then release
the MODE switch.
Next, select diagnosis code 10 in either of
the following ways.
• Hold down the MODE switch, press the
UP switch 13 times, and then release the
MODE switch.
• Hold down the MODE switch, press the
DOWN switch 19 times, and then release
the MODE switch.

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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

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Diagnosis code list
Diagnosis
codeInspected item System responseTachometer display
(0 ~ 10,000 r/min)
00 — — —
01 Voltage The tachometer displays the volt-
age ´ 500.
Example:
If the voltage is 12.5 V, the tachome-
ter displays 12.5 ´ 500 = 6,250 r/min.0 r/min (0 V) –
10,000 r/min (20 V)
02 Atmospheric
pressureThe tachometer displays the atmo-
spheric pressure sensor signal.
Example:
If the atmospheric pressure is 760
mm Hg (29.9 in Hg), the tachometer
displays 8,000 r/min.
03 Intake air pres-
sureThe tachometer displays the differ-
ence between the minimum intake
air pressure sensor signal and the
atmospheric pressure sensor signal
after the main switch is turned to
“ON” in the diagnosis mode.0 r/min (0 mm Hg)
– 1,000 r/min
(100 mm Hg)
04 Throttle position
sensorThe tachometer displays the throttle
position sensor signal.1,300 r/min (0.68 V) –
5,900 r/min (2.93 V)
05 Throttle position
sensorThe tachometer displays the mini-
mum throttle position sensor signal.5,500 r/min (0.68 V) –
10,000 r/min (1.25 V)
06 Intake air temper-
atureThe tachometer displays the intake
air temperature signal.4,800 r/min (20˚C) –
5,700 r/min (30˚C)
07 Coolant tempera-
tureThe tachometer displays the coolant
temperature sensor signal.4,900 r/min (20˚C) –
9,200 r/min (100˚C)
08 Speed sensor The tachometer displays the speed
sensor signal when the rear wheel is
rotated by hand.0 –
09 Fall detection
switchThe tachometer displays whether
the fall detection switch is on or
whether it is off or disconnected.0 r/min (on), 8,000 r/
min (off) or 10,000 r/
min (disconnected)
10 Sidestand switch The tachometer displays whether
the sidestand switch is on or off.
The tachometer displays 0 r/min
when the sidestand is down (switch
on) and 10,000 r/min when the side-
stand is up (switch off).0 r/min (on) or
10,000 r/min (off)
11 — — —

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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)

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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)

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CO EMISSION ADJUSTMENT MODE
With the CO emission adjustment mode,
the amount of fuel injected by the injector
can be adjusted.
NOTE:
Prior to adjusting the CO emission, the
throttle bodies must be properly synchro-
nized.
• Remove the bottom cowling and front
cowling.
Refer to “COWLINGS” in chapter 3.
• Remove the CO check bolts from the
exhaust pipe assembly.
• Install the exhaust attachment 1 and CO
tester 2 to the exhaust pipe assembly.
• Attach the engine tachometer to the igni-
tion coil for cylinder #1.
Refer to “SYNCHRONIZING THE THROT-
TLE BODIES” in chapter 3.
• Remove the protection cap 3 from the EFI
test coupler 4.
• Connect the CO, diagnosis switch box 5
to the EFI test coupler 4.
• Start the engine and let it warm up for
several minutes.
Exhaust attachment
90890-03134
Engine tachometer
90890-06760
CO, diagnosis switch box
90890-03171
Engine idling speed
1,000 ~ 1,200 r/min
2

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• Within 4 seconds, press the following
switches on the CO, diagnosis switch box
in the order indicated to enter the CO
emission adjustment mode.
6MODE switch = 1
7UP switch = 2
8DOWN switch = 3
1 ® 2 ® 3 ® 1 ® 2 ® 3 ® 1 ® 2 ® 3 ® 1 ®
2 ® 3
The warning light flashes for 1.4 seconds
when the unit has entered the CO emission
adjustment mode. During this time, the
tachometer displays the engine idling
speed.
NOTE:
Turn the main switch to “OFF” to cancel the
CO emission adjustment mode.
• According to the following table, select
the cylinder to be adjusted by holding
down the MODE switch while pressing
either the UP switch or the DOWN switch.
• Release the MODE switch to start the CO
emission adjustment for the selected cyl-
inder. The warning light flashes once
every 0.5 second and the tachometer dis-
plays the engine speed.
• While watching the CO tester, press the
UP switch or DOWN switch to adjust the
CO emission.
NOTE:
• If the UP switch is pressed when the CO
emission has reached its maximum or if
the DOWN switch is pressed when the CO
emission has reached its minimum, the
warning light flashes once every 0.16 sec-
ond. Tachometer display Selected cylinder
1,000 r/min Cylinder #1
2,000 r/min Cylinder #2
3,000 r/min Cylinder #3
4,000 r/min Cylinder #4
Press the UP switch Increase CO emis-
sion
Press the DOWN
switchDecrease CO emis-
sion