Yamaha SR400 2014 Service Manual page 295

Fault code No.
Item
Fail-safe system
Diagnostic code No.
FI diagnostic tool
display
D09
Procedure
Actuation
D50
Procedure
Probable cause of malfunction
1 Connections
• Fuel pump relay coupler
• Fuel pump coupler
• Injector coupler
• Wire harness ECU coupler
2 Open or short circuit in wire harness.
3 Faulty battery.
4 Malfunction in fuel pump relay or discon-
nection
Reinstatement method
43
Fuel system voltage: the ECU is unable to monitor the battery
voltage (an open or short circuit in the wire harness to the
ECU).
Able to start engine
Able to drive vehicle
D09, D50
Fuel system voltage (battery voltage)
Approximately 12.0 V
Compare the actually measured battery voltage with the FI diag-
nostic tool display value. (If the actually measured battery voltage
is low, charge the battery.)
The fuel pump relay is actuated five times at five-second intervals
(2 seconds on, 3 seconds off), and the "WARNING" LED on the FI
diagnostic tool comes on each time the relay is actuated.
Check that the fuel pump relay is actuated five times by listening
for the operating sound.
• 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 the fuel pump relay coupler and the
• Execute diagnostic code No. D09.
• Replace or recharge the battery.
• Execute diagnostic code No. D50.
• Replace if defective.
• If there is no malfunction with the fuel pump
After starting, let the engine run at idle speed for about 60 sec-
onds.
7-38
FUEL INJECTION SYSTEM
Check or maintenance job
pulled out.
the coupler securely.
circuit.
ECU
L/Y–L/Y (blue/yellow–blue/yellow)
R/L–R/L (red/blue–red/blue)
Refer to "CHECKING AND CHARGING THE
BATTERY" on page 7-60.
relay, replace the ECU.