Ecu Self-diagnostic Function

FUEL INJECTION SYSTEM

EAS27350

ECU SELF-DIAGNOSTIC FUNCTION
The ECU is equipped with a self-diagnostic function in order to ensure that the fuel injection system is
operating normally. If this function detects a malfunction in the system, it immediately operates the en-
gine 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, the ECU provides an appro-
  priate substitute characteristic operation, and alerts the rider of the detected malfunction by illuminat-
  ing the engine trouble warning light.
• After the engine has been stopped, the lowest fault code number appears on the odometer/tripme-
  ter/fuel reserve tripmeter LCD. 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 fuel injection system operation
  Warning light indica-                                Fuel injection opera-
                                 ECU operation                                      Vehicle operation
         tion                                                   tion
                           Warning provided
 Flashing*                 when unable to start       Operation stopped          Cannot be operated
                           engine
                                                      Operated with substi-
                                                      tute characteristics in    Can or cannot be oper-
 Remains on                Malfunction detected       accordance with the        ated depending on the
                                                      description of the mal-    fault code
                                                      function

* The warning light flashes when any one of the conditions listed below is present and the start switch
  is pushed:
                                                                Cylinders-#1/#4 ignition coil
11:      Cylinder identification sensor                33:
                                                                (faulty ignition)
                                                                   Cylinders-#2/#3 ignition coil
 12:       Crankshaft position sensor                     34:
                                                                   (faulty ignition)
           Black/red ECU lead                                      Lean angle sensor
 19:                                                      41:
           (broken or disconnected)                                (open or short-circuit)
           Lean angle sensor                                       ECU internal malfunction
 30:                                                      50:
           (latch up detected)                                     (memory check error)

Checking the engine trouble warning light
The engine trouble warning light comes on for 1.4 seconds after the main switch has been turned to
“ON” and it comes on while the start switch is being pushed. If the warning light does not come on under
these conditions, the warning light (LED) may be defective.

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