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...

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...

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...

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...

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...

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.
...

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...

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...

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...

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)...