Ecu Self-Diagnostic Function - Yamaha FZ09E Service Manual

FUEL INJECTION SYSTEM
EA$27$1
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 warni ng light to alert the rider
that a malfunction has occurred in the system. Once a malfunction has been detected, a fault code
number is stored in the memory of the ECU.
•To infonm the rider that the fuel injection system is not functioning, the engine trouble warning light
flashes while the
"(i)"
side of the start/engine stop 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 meter display. 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
ECU operation
Fuel injection
Vehicle operation
indication operation
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 following conditions is present and the "&>" side of the starVen-
gine stop switch is pushed:
12:
Crankshaft position sensor
19:
Sidestand switch
(open circuit in the wire to the ECU)
Lean angle sensor
(latch up detected)
30:
Checking the eng ine trouble warning light
4 1:
50:
Lean angle sensor
(open or short circuit)
ECU internal malfunction
(faulty ECU memory)
The engine trouble warning light comes on for around 2 seconds after the main switch has been set to
"ON" and it comes on while the "<ll" side of the start/engine stop switch is being pushed. If the warning
light does not come on under these conditions, the warning light (LED) may be defective.
a
b
c
a. Main switch "OFP'
b. Main switch "ON"
c. Engine trouble warning light off
d. Engine trouble warning light on for around 2
seconds
c
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