Ecu's Self-Diagnostic Function; Elec - Yamaha XF50W Service Manual

ECU'S SELF-DIAGNOSTIC FUNCTION

The ECU is equipped with a self-diagnostic function in order to ensure that the engine control sys-
tem is operating normally. If this function detects a malfunction in the system, it immediately operates
the engine under substitute characteristics and illuminates the engine trouble warning light to
alert the rider that a malfunction has occurred in the system. Once a malfunction has been detected,
a fault code is stored in the memory of the ECU.
Engine trouble warning light
1
Engine trouble warning light fault code indication
Digit of 10: Cycles of 1 see. ON and 1.5 sec. OFF.
Digit of 1: Cycles of 0.5 sec, ON and 0.5 sec. OFF.
<Example> 42
Light ON
Light OFF
1 1
1.5
EAS00900
Engine trouble warning light indication and Fl system operating condition
Engine condition
Operate Operate
(cranking with electric (cranking with electric
starter) starter)
Stop
FUEL INJECTION SYSTEM
1 1 1 1
1.5 1.5
Warning light
indication
Flashing
Remains ON
Flashing
(indicate the fault code)
8 To inform the rider that the fuel injection sys-
tem is not functioning correctly, the engine
trouble warning light flashes when the start
switch is being pushed to start the engine.
8 If a malfunction is detected in the system
by the self-diagnostic function, this mode
provides an appropriate substitute charac-
teristic operation, and alerts the rider of the
detected malfunction by illuminating the en-
gine trouble warning light.
8 After the engine has been stopped, the low-
est fault code number appears on the en-
gine trouble warning light (or displayed on
the Fl diagnostic tool). It remains stored in
the memory of the ECU until it is deleted.
1 1 1.5 0 . 5 0 . 5 0 . 5 0 . 5 0 . 5 0 . 5
Fl operation
Operation stopped
Operated with substitute char-
acteristics in accordance with
the description of the mal-
function
_
7-4
FI
3
Vehicle operation
Unable
Able
ifl
_