Yamaha YP400T Service Manual page 312

Fault code No. 44 Symptom
Used diagnostic No. 60 (EEPROM improper cylinder indication)
Order Inspection operation item and
probable cause
1 Malfunction in ECU
Fault code No. 46 Symptom
Used diagnostic code No. – –
Order Inspection operation item and
probable cause
1 Connected condition of connector
Inspect the coupler for any pins
that may have pulled out.
Check the locking condition of the
coupler.
2 Faulty battery
3 Open or short circuit in wiring har-
ness.
FUEL INJECTION SYSTEM
Error is detected while reading from or writing on EEPROM
(code re-registering key code and throttle valve fully closed notification value).
Operation item and countermeasure
Execute diagnostic mode (code No. 60)
• 01 is displayed on meter.
Readjust the CO of the displayed cylinder.
Refer to "ADJUSTING THE EXHAUST GAS
VOLUME" in chapter 3.
Replace ECU if defective.
• 03 is displayed on meter.
Replace the ECU.
• 04 is displayed on meter.
Turn the main switch to ON, and turn the throt-
tle grip to full open and then to full close posi-
tion.
Replace ECU if defective.
Power supply to the FI system relay is not normal.
Operation item and countermeasure
If there is a malfunction, repair it and connect it
securely.
ECU coupler
Replace or charge the battery.
Refer to "CHECKING AND CHARGING THE BAT-
TERY" in chapter 3.
Repair or replace if there is an open or short circuit.
• Between battery and main switch
red – red
• Between main switch and fuse (ignition)
brown/blue – brown/blue
• Between fuse (ignition) and engine stop switch
red/white – red/white
• Between engine stop switch and fuel injection
system relay
red/black – red/black
• Between fuel injection system relay and ECU
red/yellow – red/yellow
7 - 22
FI
Reinstatement
method
Reinstated by turn-
ing the main switch
ON.
Reinstatement
method
Reinstated by
starting the engine
and operating it at
idle.