Troubleshooting Chart - Yamaha YP400T Service Manual

EAS00904

TROUBLESHOOTING CHART

Engine operation is not normal or the engine trouble warning light is on.
* Engine trouble warning light may not come on even if the engine operation is not normal.
The engine trouble warning light comes on.
Check the fault code number displayed on the meter.
Identify the system with the malfunction. Refer to
"FAIL-SAFE ACTIONS TABLE".
Identify the probable cause of malfunction. Refer to
"Fault code table".
Check and repair the probable cause of malfunction.
Fault code No. YES
Check and repair.
Refer to "TROUBLE-
SHOOTING DETAILS".
Monitor the operation of
the sensors and actua-
tors in the diagnostic
mode. Refer to "Diag-
nostic mode table".
Perform ECU reinstatement action. Refer to "Rein-
statement method" in "TROUBLESHOOTING
DETAILS".
Turn the main switch to "OFF", turn the main switch
back to "ON", and then check if the fault code number
is still displayed.
Erasing the malfunction history:*
The malfunction history is stored even if the main switch is turned OFF.
The malfunction history must be erased in the diagnostic mode. Refer to "Diagnostic mode table (Diagnostic code
No.62)".
* Operated when the engine trouble warning light is on.
FUEL INJECTION SYSTEM
Fault code No. NO
Check and repair.
Refer to "FAIL-SAFE
ACTIONS TABLE".
Fault code number not displayed
Repairs completed
7 - 6
The engine trouble warning light does not come on.
Check the operation of following sensors and actua-
tors in the diagnostic mode. Refer to "Diagnostic
mode table".
01: Throttle position sensor (throttle angle)
30: Ignition coil
36: Fuel injector
OK
Engine malfunction
Check and repair the
inner parts of engine.
Refer to Chapter 5.
OK
Check the engine condition.
Fault code number
displayed
FI
NG
Defective sensor or
actuator
Check and repair the
corresponding sen-
sor or actuator.
NG OK
OK