Yamaha FZ1-N Service Manual page 380

Fault code No. 20
Diagnostic code No.
Orde Item/components and probable
r
Defective intake air pressure sensor or
atmospheric pressure sensor.
1
Fault code No.
Diagnostic code No.
Item/components and probable
Order
Connections
• Coolant temperature sensor coupler
• Main wire harness ECU coupler
1 • Sub-wire harness coupler
Open or short circuit in wire harness.
2
Defective coolant temperature sensor. • Execute the diagnostic mode.
3
When the main switch is turned to "ON", the atmospheric
Symptom pressure sensor voltage and intake air pressure sensor
02
03
cause
21 Symptom
06
cause
FUEL INJECTION SYSTEM
voltage differ greatly.
Atmospheric pressure sensor
Intake air pressure sensor
Check or maintenance job
• Execute the diagnostic mode.
(Code Nos. 02, 03)
• Replace if defective.
Refer to "CHECKING THE
INTAKE AIR PRESSURE SEN-
SOR" on page 8-112 or
"CHECKING THE ATMO-
SPHERIC PRESSURE SEN-
SOR" on page 8-111.
Coolant temperature sensor:open or short circuit
Coolant temperature sensor
Check or maintenance job
• Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the couplers.
• If there is a malfunction, repair it
and connect the coupler
securely.
• Repair or replace if there is an
open or short circuit.
• Between coolant temperature
sensor coupler and ECU cou-
pler.
(Green/White–Green/White)
(Black/Blue–Black/Blue)
(Code No.06)
• Replace if defective.
Refer to "CHECKING THE
COOLANT TEMPERATURE
SENSOR" on page 8-108.
8-56
detected.
Reinstatement
method
Turning the
main switch to
"ON".
Reinstatement
method
Turning the
main switch to
"ON".