Ecu's Self-Diagnostic Function - Yamaha RX10LTGTYL 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 oper-
ates 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.
• To inform the rider that the fuel injection system is not functioning, the engine trouble warning light
flashes when the start switch is being pushed to start the engine.
• If a malfunction is detected in the system by the self-diagnostic function, this mode provides an
appropriate substitute characteristic operation, and alerts the rider of the detected malfunction by
flashing an engine trouble warning light.
• The fault code number appears from the lowest value in order of precedence on the LCD meter.
Once a fault code has been displayed, it remains stored in the memory of the ECU until it is
deleted.
Engine trouble warning light indication and FI system operating condition
Warning light indication
Flashing*
Remains ON
* The warning light flashes when any one of the conditions listed below is present and the start
switch is pushed.
The period for flashing is 160 ms. (Period during SELF-DIAGNOSTIC is 1000 ms.)
11: Cylinder identification sensor
12: Crankshaft position sensor
Checking for a defective engine trouble warning light bulb
The engine trouble warning light comes on for 1.4 seconds after the main switch has been turned
"ON" and when the main switch is being turned. If the warning light does not come on under these
conditions, the warning LED may be defective.
Main switch Main switch
OFF ON
Engine trouble Light
warning light OFF
FUEL INJECTION SYSTEM
ECU's operation
Warning provided when
unable to start engine
Malfunction detected
Light ON for
Light
1.4 seconds
OFF
FI operation
Operation stopped
Operated with
substitute
characteristics in
accordance with the
description of the
malfunction
30: Oil pressure dropped.
50: ECU internal malfunction
(memory check error)
60
FI
Vehicle operation
Unable
Able/Unable depending
on the self-diagnostic
fault code