Yamaha YZF-R15, Service Manual

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8-41
FUEL INJECTION SYSTEM
Fault code No. 12 Symptom No normal signals are received from the crankshaft posi-
tion sensor.
Diagnostic code No.
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Installed condition of crankshaft posi-
tion sensor. Check for looseness or pinching. Cranking the
engine.
2 Connections
• Crankshaft position sensor coupler
• Main wire harness ECU coupler • Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
3 Open or short circuit in wire harness. • Repair or replace if there is an
open or short circuit.
• Between the crankshaft position
sensor coupler and ECU cou-
pler.
(red–red)
(black/blue–black/blue)
4 Defective crankshaft position sensor. • Replace if defective.
Refer to “CHECKING THE
CRANKSHAFT POSITION
SENSOR” on page 8-68.
8-42
FUEL INJECTION SYSTEM
Fault code No. 13 Symptom Intake air pressure sensor: open or short circuit detected.
Diagnostic code No. 03 Intake air pressure sensor
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Connections
• Intake air pressure sensor coupler
• Main wire harness ECU coupler • Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
Turning the
main switch to
“ON”.
2 Open or short circuit in wire harness. • Repair or replace if there is an
open or short circuit.
• Between intake air pressure
sensor coupler and ECU cou-
pler
(blue/red–blue/red)
(pink/white–pink/white)
(black/blue–black/blue)
3 Defective intake air pressure sensor. • Execute the diagnostic mode.
(Code No.03)
• Replace the throttle body if de-
fective.
Refer to “CHECKING THE
THROTTLE BODY SENSOR
ASSEMBLY” on page 8-72.
CAUTION:
Do not remove the throttle
body sensor assembly from
the throttle body.
TROUBLESHOOTING DETAILS
This section describes the measures per fault code number displayed on the FI diagnostic tool. Check
and service the items or components that are the probable cause of the malfunction following the order
given.
After the check and service of the malfunctioning part has been completed, reset the FI diagnostic tool
display according to the reinstatement method.
Fault code No.:
Fault code number displayed on the FI diagnostic tool when the engine failed to work normally. Refer
to “Diagnostic code table”.
Diagnostic code No.:
Diagnostic code number to be used when the diagnostic mode is operated. Refer to“Sensor operation
table” and “Actuator operation table”.
CAUTION:
Do not remove the sensor module (throttle body sensor assembly) from the throttle body.