Yamaha Yzf R1 2007 Manual

							FUEL INJECTION SYSTEM
8-32
EAS27362
FAIL-SAFE ACTIONS (SUBSTITUTE CHARACTERISTICS OPERATION CONTROL)
If the ECU detects an abnormal signal from a sensor while the vehicle is being driven, the ECU illu-
minates the engine trouble warning light and provides the engine with alternate operating instruc-
tions that are appropriate for the type of malfunction.
When an abnormal signal is received from a sensor, the ECU processes the specified values that 
are programmed for each sensor in order to provide the engine with alternate operating instructions 
that enable the engine to continue to operate or stop operating, depending on the conditions.
Self-Diagnostic Function table
a. Main switch “OFF”
b. Main switch “ON”
c. Engine trouble warning light off
d. Engine trouble warning light on for 1.4 sec-
onds
Fault 
code No.Item SymptomAble / 
unable to 
startAble / 
unable to 
drive
11Cylinder identification 
sensor No normal signals are received 
from the cylinder identification 
sensor.
 Malfunction of electric starting 
system.Unable Able
12Crankshaft position 
sensorNo normal signals are received 
from the crankshaft position sen-
sor.Unable Unable
13Intake air pressure 
sensor
(open or short circuit)Intake air pressure sensor-open or 
short circuit detected.Able Able
14Intake air pressure 
sensor
(pipe system)Intake air pressure sensor-pipe 
system malfunction (clogged or 
detached hose).Able Able
15Throttle position sen-
sor (for throttle valves) 
(open or short circuit/
loose connection)Throttle position sensor (for throttle 
valves):
open or short circuit detected.
Throttle position sensor (for throttle 
valves) coupler connection is 
loose.Able/Unable Able/Unable
17EXUP servo motor cir-
cuit
(open or short circuit)EXUP servo motor circuit: open or 
short circuit detected.Able Able
18EXUP servo motor
(stuck)EXUP servo motor is stuck. Able Able
19Sidestand switch
(open circuit wire har-
ness to ECU)Open circuit is detected in the input 
line from the sidestand switch to 
the ECU.Unable Unable 
						

							FUEL INJECTION SYSTEM
8-33
20Intake air pressure 
sensor
Atmospheric pressure 
sensorIntake air pressure sensor-open or 
short circuit detected.
Defective values are detected due 
to the internal malfunction of the 
intake air pressure sensor or the 
Atmospheric pressure sensor.Able Able
21Coolant temperature 
sensorCoolant temperature sensor-open 
or short circuit detected.Able Able
22Intake air temperature 
sensorIntake air temperature sensor-
open or short circuit detected.Able Able
23Atmospheric pressure 
sensorAtmospheric pressure sensor-
open or short circuit detected.Able Able
24O
2 sensorNo normal signal is received from 
the O2 sensor.Able Able
30 Lean angle sensorLatch up detected.
No normal signal is received from 
the lean angle sensor.Unable Unable
33Ignition coil (#1)
(faulty ignition)Malfunction detected in the pri-
mary wire of the ignition coil (#1).Able
(depending 
on the num-
ber of faulty 
cylinders)Able
(depending 
on the num-
ber of faulty 
cylinders)
34Ignition coil (#2)
(faulty ignition)Malfunction detected in the pri-
mary wire of the ignition coil (#2).Able
(depending 
on the num-
ber of faulty 
cylinders)Able
(depending 
on the num-
ber of faulty 
cylinders)
35Ignition coil (#3)
(faulty ignition)Malfunction detected in the pri-
mary wire of the ignition coil (#3).Able
(depending 
on the num-
ber of faulty 
cylinders)Able
(depending 
on the num-
ber of faulty 
cylinders)
36Ignition coil (#4)
(faulty ignition)Malfunction detected in the pri-
mary wire of the ignition coil (#4).Able
(depending 
on the num-
ber of faulty 
cylinders)Able
(depending 
on the num-
ber of faulty 
cylinders)
39Injector
(open circuit)Injector:
open circuit detected.Able
(depending 
on the num-
ber of faulty 
cylinders)Able
(depending 
on the num-
ber of faulty 
cylinders)
41Lean angle sensor
(open or short circuit)Lean angle sensor-open or short 
circuit detected.Unable Unable
42Speed sensor
Neutral switchNo normal signals are received 
from the speed sensor.
Open or short circuit is detected in 
the neutral switch.Able Able Fault 
code No.Item SymptomAble / 
unable to 
startAble / 
unable to 
drive 
						

							FUEL INJECTION SYSTEM
8-34
Communication error with the meter43Fuel system voltage
(monitor voltage)The ECU is unable to monitor the 
battery voltage
(an open circuit in the line to the 
ECU).Able Able
44Error in writing the 
amount of CO adjust-
ment on EEPROMError is detected while reading or 
writing on EEPROM (CO adjust-
ment value).Able Able
46Vehicle system power 
supply
(Monitoring voltage)Power supply to the fuel injection 
system is not normal.Able Able
50ECU internal malfunc-
tionECU memory is faulty. (When this 
malfunction is detected in the ECU, 
the fault code number might not 
appear on the meter.)Able/Unable Able/Unable
59Throttle position sen-
sor (for throttle cable 
pulley)
(open or short circuit/
loose connection)Throttle position sensor (for throttle 
cable pulley):
open or short circuit detected.
Throttle position sensor (for throttle 
cable pulley) coupler connection is 
loose.Able/Unable Able/Unable
60 Throttle servo motorThrottle servo motor:
open or short circuit detected.
Motor is defective or ECU internal 
malfunction.Able/Unable Able/Unable
Fault 
code No.Item SymptomAble / 
unable to 
startAble / 
unable to 
drive
Er-1ECU internal malfunc-
tion
(output signal error)No signals are received from the 
ECU.Unable Unable
Er-2ECU internal malfunc-
tion
(output signal error)No signals are received from the 
ECU within the specified duration.Unable Unable
Er-3ECU internal malfunc-
tion
(output signal error)Data from the ECU cannot be 
received correctly.Unable Unable
Er-4ECU internal malfunc-
tion
(input signal error)Non-registered data has been 
received from the meter.Unable Unable Fault 
code No.Item SymptomAble / 
unable to 
startAble / 
unable to 
drive 
						

							FUEL INJECTION SYSTEM
8-35
EAS27400
TROUBLESHOOTING METHOD
The engine operation is not normal and the
engine trouble warning light comes on.
1. Check:
 Fault code number
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Check the fault code number displayed on 
the meter.
b. Identify the faulty system with the fault 
code. Refer to “Self-Diagnostic Function 
table”.
c. Identify the probable cause of malfunction. 
Refer to “Fault code table”.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
2. Checking and repair the probable cause of 
malfunction.
3. Perform fuel injection table reinstatement 
action.
Refer to “Reinstatement method” of table in 
“TROUBLESHOOTING DETAILS”.
4. Turn the main switch to “OFF” and back to 
“ON”, then check the fault code number is 
displayed.
NOTE:
If fault code are displayed, repeat steps (1) to 
(4) until no fault code number is displayed.
5. The Malfunction history is stored even if the 
main switch is turned OFF. The malfunction 
history must be erased in the diagnostic 
mode. Refer to “Sensor operation table 
(Diagnostic code No.62)”.The engine operation is not normal but the
engine trouble warning light does not come
on.
1. Check the operation of following sensors 
and actuators in the Diagnostic mode. 
Refer to “Sensor operation table” and 
“Actuator operation table”.
If a malfunction is detected in the sensors 
or actuators, repair or replace all faulty 
parts.
If no malfunction is detected in the sensors 
and actuators, check and repair inner parts 
of the engine. Fault code No. No fault code No.
Check and repair. 
Refer to TROUBLE-
SHOOTING 
DETAILS on page 8-
44.
Monitor the operation 
of the sensors and 
actuators in the diag-
nostic mode. Refer to 
“Sensor operation 
table” and “Actuator 
operation table”.Check and repair. 
Refer to TROUBLE-
SHOOTING 
DETAILS on page 8-
44.
01: Throttle position sensor (for throttle 
valves) signal 1 (throttle angle)
13: Throttle position sensor (for throttle 
valves) signal 2 (throttle angle)
14: Throttle position sensor (for throttle cable 
pulley) signal 1 (throttle angle)
15: Throttle position sensor (for throttle cable 
pulley) signal 2 (throttle angle)
30: Ignition coil #1
31: Ignition coil #2
32: Ignition coil #3
33: Ignition coil #4
36: Injector #1
37: Injector #2
38: Injector #3
39: Injector #4
48: AI system solenoid 
						

							FUEL INJECTION SYSTEM
8-36
EAS27421
DIAGNOSTIC MODE
Setting the diagnostic mode
1. Turn the main switch to “OFF” and set the engine stop switch to “ON”.
2. Disconnect the wire harness coupler from the fuel pump.
3. Simultaneously press and hold the “SELECT” and “RESET” buttons, turn the main switch to 
“ON”, and continue to press the buttons for 8 seconds or more.
NOTE:
 All displays on the meter disappear except the odometer/trip meter/fuel reservoir trip meter/stop 
watch displays.
 “dIAG” appears on the odometer/trip meter/fuel reservoir trip meter/stop watch LCD.
4. Press the “SELECT” button to select the diagnostic mode “dIAG”.
5. After selecting “dIAG”, simultaneously press the “SELECT” and “RESET” buttons for 2 seconds 
or more to activate the diagnostic mode. The diagnostic code number “d01” appears on the 
odometer/trip meter/fuel reservoir trip meter/stop watch LCD.
6. Set the engine stop switch to “OFF”.
7. Select the diagnostic code number corresponding to the fault code number by pressing the 
“SELECT” and “RESET” buttons.
NOTE:
The diagnostic code number appears on the odometer/trip meter/fuel reservoir trip meter/stop watch 
LCD (01–70).
 To decrease the selected diagnostic code number, press the “RESET” button. Press the “RESET” 
button for 1 second or longer to automatically decrease the diagnostic code numbers.
 To increase the selected diagnostic code number, press the “SELECT” button. Press the 
“SELECT” button for 1 second or longer to automatically increase the diagnostic code numbers.
8. Verify the operation of the sensor or actuator.
 Sensor operation
The data representing the operating conditions of the sensor appears on the odometer/trip 
meter/fuel reservoir trip meter/stop watch LCD.
 Actuator operation
Set the engine stop switch to “ ” to operate the actuator. 
						

							FUEL INJECTION SYSTEM
8-37
NOTE:
If the engine stop switch is set to “ ”, set it to “ ”, and then set it to “ ” again.
9. Turn the main switch to “OFF” to cancel the diagnostic mode.
Fault code table
Fault 
code 
No.Symptom Probable cause of malfunctionDiagnostic 
code No.
11No normal signals are 
received from the cylinder 
identification sensor when 
the engine is started or 
while the vehicle is being 
driven. Open or short circuit in sub-wire-harness 1.
 Open or short circuit in wire harness.
 Defective cylinder identification sensor.
 Malfunction in ECU.
 Improperly installed sensor.—
12No normal signals are 
received from the crank-
shaft position sensor. Open or short circuit in wire harness.
 Defective crankshaft position sensor.
 Malfunction in pickup rotor.
 Malfunction in ECU.
 Improperly installed sensor.—
13Intake air pressure sensor: 
open or short circuit 
detected. Open or short circuit in wire harness.
 Defective intake air pressure sensor.
 Malfunction in ECU.03
14Intake air pressure sensor: 
hose system malfunction 
(clogged or detached 
hose). Intake air pressure sensor hose is 
detached, clogged, kinked, or pinched.
 Malfunction in ECU.03
15Throttle position sensor (for 
throttle valves): open or 
short circuit detected.
Throttle position sensor (for 
throttle valves) coupler con-
nection is loose. Open or short circuit in wire harness.
 Defective throttle position sensor (for throt-
tle valves).
 Malfunction in ECU.
 Improperly installed throttle position sensor 
(for throttle valves).01
13
17EXUP servo motor circuit: 
open or short circuit 
detected or loose connec-
tion. Open or short circuit in wire harness.
 Defective EXUP servo motor (potentiometer 
circuit).53
18 EXUP servo motor is stuck. Open or short circuit in wire harness.
 Stuck EXUP servo motor (mechanism).
 Stuck EXUP servo motor (motor).53
19Open circuit is detected in 
the input lead from the side-
stand switch to the ECU. Open circuit in wire harness (ECU Coupler).
 Malfunction in ECU.
 Relay unit (diode)20 
						

							FUEL INJECTION SYSTEM
8-38
20When the main switch is 
turned to “ON”, the atmo-
spheric pressure sensor 
voltage and intake air pres-
sure sensor voltage differ 
greatly. Atmospheric pressure sensor hose is 
clogged.
 Intake air pressure sensor hose is clogged, 
kinked, or pinched.
 Malfunction of the atmospheric pressure 
sensor in the intermediate electrical poten-
tial.
 Malfunction of the intake air pressure sen-
sor in the intermediate electrical potential.
 Malfunction in ECU.03
02
21Coolant temperature sen-
sor: open or short circuit 
detected. Open or short circuit in wire harness.
 Defective coolant temperature sensor.
 Malfunction in ECU.
 Improperly installed coolant temperature 
sensor.06
22Air temperature sensor: 
open or short circuit 
detected. Open or short circuit in wire harness.
 Defective air temperature sensor.
 Malfunction in ECU.
 Improperly installed air temperature sensor.05
23Atmospheric pressure sen-
sor: open or short circuit 
detected. Open or short circuit in wire harness.
 Defective atmospheric pressure sensor.
 Improperly installed atmospheric pressure 
sensor.
 Malfunction in ECU.02
24No normal signal is 
received from the O
2 sen-
sor. Open or short circuit in wire harness.
 Defective O2 sensor.
 Malfunction in ECU.
 Improperly installed O
2 sensor.—
30Latch up detected.
No normal signal is 
received from the lean 
angle sensor. The vehicle has overturned.
 Defective lean angle sensor.
 Malfunction in ECU.
 Improperly installed lean angle sensor.08
33Open circuit detected in the 
primary lead of the cylinder-
#1 ignition coil. Open circuit in wire harness.
 Malfunction in ignition coil.
 Malfunction in ECU.30
34Open circuit detected in the 
primary lead of the cylinder-
#2 ignition coil. Open circuit in wire harness.
 Malfunction in ignition coil.
 Malfunction in ECU.31
35Open circuit detected in the 
primary lead of the cylinder-
#3 ignition coil. Open circuit in wire harness.
 Malfunction in ignition coil.
 Malfunction in ECU.32
36Open circuit detected in the 
primary lead of the cylinder-
#4 ignition coil. Open circuit in wire harness.
 Malfunction in ignition coil.
 Malfunction in ECU.33
39Open circuit detected in a 
injector. Open or short circuit in wire harness.
 Defective primary injector.
 Malfunction in ECU.
 Improperly installed primary injector.36
37
38
39 Fault 
code 
No.Symptom Probable cause of malfunctionDiagnostic 
code No. 
						

							FUEL INJECTION SYSTEM
8-39
41Lean angle sensor:
open or short circuit 
detected. Open or short circuit in wire harness.
 Defective lean angle sensor.
 Malfunction in ECU.08
42No normal signals are 
received from the speed 
sensor. Open circuit in wire harness.
 Malfunction in speed sensor.
 Malfunction in ECU.07
Neutral switch:
open or short circuit 
detected. Open circuit in wire harness.
 Malfunction in neutral switch.
 Malfunction in ECU.21
43Power supply to the injec-
tors and the fuel pump is 
not normal. Open or short circuit in wire harness.
 Malfunction in ECU.09
44An error is detected while 
reading or writing on 
EEPROM (CO adjustment 
value). Malfunction in ECU.
(The CO adjustment value is not properly 
written on or read from the internal mem-
ory).60
46 Power supply is not normal.Malfunction in the charging system.
Refer to CHARGING SYSTEM on page 8-
11.—
50Faulty ECU memory.
(When this malfunction is 
detected in the ECU, the 
fault code number might not 
appear on the meter.) Malfunction in ECU.
(The program and data are not properly 
written on or read from the internal mem-
ory.)—
59Throttle position sensor (for 
throttle cable pulley):
open or short circuit 
detected.
Throttle position sensor (for 
throttle cable pulley) cou-
pler connection is loose. Open or short circuit in wire harness.
 Defective throttle position sensor.
 Improperly installed throttle position sensor.
 Malfunction in ECU.14
15
60Throttle servo motor:
open or short circuit 
detected.
Defective throttle servo 
motor.
Malfunction in ECU (servo 
motor driving system). Open or short circuit in wire harness.
 Defective throttle servo motor (potentiome-
ter circuit).
 Stuck throttle servo motor (mechanism).
 Stuck throttle servo motor (motor).
 Malfunction in ECU.01
Er-1No signals are received 
from the ECU. Open or short circuit in wire harness.
 Malfunction in meter.
 Malfunction in ECU.
 Defective wire connection of the ECU cou-
pler.—
Er-2No signals are received 
from the ECU within the 
specified duration. Improper connection in wire harness.
 Malfunction in meter.
 Malfunction in ECU.— Fault 
code 
No.Symptom Probable cause of malfunctionDiagnostic 
code No. 
						

							FUEL INJECTION SYSTEM
8-40
Sensor operation tableEr-3Data from the ECU cannot 
be received correctly. Improper connection in wire harness.
 Malfunction in meter.
 Malfunction in ECU.—
Er-4Non-registered data has 
been received from the 
meter. Improper connection in wire harness.
 Malfunction in meter.
 Malfunction in ECU.—
Diag-
nostic 
code 
No.Item Meter display Checking method
01 Throttle position sensor (for 
throttle valves) signal 1
 Fully closed position 12–21 Check with throttle valves 
fully closed.
 Fully opened position 97–106 Check with throttle valves 
fully opened.
02 Atmospheric pressure Displays the atmospheric 
pressure.Compare the actually mea-
sured atmospheric pres-
sure with the meter display 
value.
03 Intake air pressure Displays intake air pressure. Compare the actually mea-
sured atmospheric pres-
sure with the meter display 
value without cranking the 
engine.
05 Intake air temperature Displays the intake air tem-
perature.Compare the actually mea-
sured air temperature with 
the meter display value.
06 Coolant temperature Displays the coolant tempera-
ture.Compare the actually mea-
sured coolant temperature 
with the meter display 
value.
07 Vehicle speed pulse 0–999 Check that the number 
increases when the rear 
wheel is rotated. The num-
ber is cumulative and does 
not reset each time the 
wheel is stopped.
08 Lean angle sensor Remove the lean angle 
sensor and incline it more 
than 65 degrees.  Upright 0.4–1.4
 Overturned 3.7–4.4 Fault 
code 
No.Symptom Probable cause of malfunctionDiagnostic 
code No. 
						

							FUEL INJECTION SYSTEM
8-41
09 Fuel system voltage
(battery voltage)Approximately 12.0 Set the engine stop switch 
to “ ”, and then compare 
with the actually measured 
battery voltage. (If the bat-
tery voltage is lower, 
recharge the battery.)
13 Throttle position sensor (for 
throttle valves) signal 2
 Fully closed position 9–23 Check with throttle valve 
fully closed.
 Fully opened position 94–108 Check with throttle valve 
fully opened.
14 Throttle position sensor (for 
throttle cable pulley) signal 
1
 Fully closed position 12–22 Check with throttle grip fully 
closed.
 Fully opened position 97–107 Check with throttle grip fully 
opened.
15 Throttle position sensor (for 
throttle cable pulley) signal 
2
 Fully closed position 10–24 Check with throttle grip fully 
closed.
 Fully opened position 95–109 Check with throttle grip fully 
opened.
20 Sidestand switch Set ON/OFF the sidestand 
switch (with the transmis-
sion in gear).  Stand retracted ON
 Stand extended OFF
21 Neutral switch Shift the transmission.
 Neutral ON
 In gear OFF
60 EEPROM fault cylinder No.
 No history
 History exists00
01-04 (fault cylinder No.)
 (If more than one cylinder is 
defective, the display 
changes every two seconds 
to show all the detected cyl-
inder numbers. When all 
cylinder numbers are 
shown, the display repeats.)— Diag-
nostic 
code 
No.Item Meter display Checking method