Troubleshooting Details - Yamaha SR400 2014 Service Manual

EAS30651

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 have been completed, reset the FI diagnostic tool
display according to the reinstatement method.
Fault code No.:
Fault code numbers displayed on the FI diagnostic tool when the engine failed to work normally
Diagnostic code No.:
Diagnostic code number to be used when the diagnostic mode is operated (refer to "DIAGNOSTIC
MODE" on page 7-25)
Fault code No.
Item
Fail-safe system
Diagnostic code No.
FI diagnostic tool display
Procedure
Probable cause of malfunction
1 Installed condition of crankshaft position
sensor.
2 Connections
• Crankshaft position sensor coupler
• Wire harness ECU coupler
3 Open or short circuit in wire harness.
4 Defective crankshaft position sensor.
Reinstatement method
Fault code No.
Item
Fail-safe system
Diagnostic code No.
12
Crankshaft position sensor: no normal signals are received
from the crankshaft position sensor.
Unable to start engine
Unable to drive vehicle
—
—
—
• Check for looseness or pinching.
• Check the coupler for any pins that may be
• Check the locking condition of the coupler.
• If there is a malfunction, repair it and connect
• Repair or replace if there is an open or short
• Between crankshaft position sensor coupler
• Replace if defective.
Crank the engine.
13
Intake air pressure sensor: open or short circuit detected.
Able to start engine
Able to drive vehicle
D03
7-28
FUEL INJECTION SYSTEM
Check or maintenance job
pulled out.
the coupler securely.
circuit.
and ECU coupler.
B/L–B/L (black/blue–black/blue)
Gy–Gy (gray–gray)
Refer to "CHECKING THE CRANKSHAFT
POSITION SENSOR" on page 7-67.