Ecu's Self-Diagnostic Function - Yamaha FZ6-SS 2004 Service Manual

EAS00899

ECU'S SELF-DIAGNOSTIC FUNCTION

The ECU is equipped with a self-diagnostic function in order to ensure that the engine control 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.
S 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.
S If a malfunction is detected in the system by the self-diagnostic function, this mode provides an ap-
propriate substitute characteristic operation, and alerts the rider of the detected malfunction by illumi-
nating an engine trouble warning light.
S After the engine has been stopped, the lowest fault code number appears on the LCD meter. Once a
fault code has been displayed, it remains stored in the memory of the ECU until it is deleted.
EAS00900
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.
12: Crankshaft position sensor
19: Sidestand switch
(open circuit in wire to ECU)
30: Lean angle cut-off switch
(latch up detected)
EAS00901
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 start switch is being pushed. If the warning light does not come on under these condi-
tions, the warning light bulb may be defective.
FUEL INJECTION SYSTEM
ECU's operation
Warning provided
when unable to start
engine
Malfunction detected
41:
50:
7-3
FI operation
Operation stopped
Operated with
substitute
characteristics
in accordance with the
description of the
malfunction
Lean angle cut-off switch
(open or short circuit)
ECU internal malfunction
(memory check error)
FI
Vehicle operation
Unable
Able/Unable depend-
ing on the self-diag-
nostic fault code