Yamaha YZF-R1P 2001-2003, Service Manual

Page: 344 / 439

7 - 3
FI
FUEL INJECTION SYSTEM
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,
it becomes stored in the ECU memory in the form of a fault code.
• To inform the rider that the fuel injection stop function is active, the engine trouble warning light
blinks while the start switch is being pressed to start the engine.
• If a malfunction in the system is detected by the self-diagnostic function, this mode provides an
appropriate substitute characteristic operation, and alerts the rider of the detected malfunction by
illuminating a engine trouble warning light.
• After the engine has been stopped, digital numbers representing the self-diagnostic fault codes
appear on the clock LCD. Once a self-diagnostic fault code has been displayed, it remains stored
in the ECU memory until a deletion operation is performed.
Engine trouble warning light indication and FI system operating conditions
* This control is effected when any one of the conditions listed below is present and the starter
switch is turned ON:
Function to check for blown engine trouble warning light bulb
The engine trouble warning light illuminates for 1.4 seconds after the main switch has been turned
“ON” and while the starter switch is being pressed. If the warning light does not illuminate under
these conditions, a problem may have possibly occurred, such as a blown warning light bulb.
Warning light
indication
ECU’s operating
condition
FI operating condition Starting and driving
Blinking * Warning control when
unable to start engine Operation stopped Unable
Continuous ON Detecting malfunction Gives driving
instructions with
substitute characteristics
in accordance with the
description of the
malfunction. Able/Unable depending
on self-diagnostic fault
code
11: Cylinder identification sensor 30: Lean angle cut-off switch
(latch up detected)
12: Crankshaft position sensor 41: Lean angle cut-off switch
(open or short circuit)
19: Sidestand switch
(open circuit in wire to ECU) 50: ECU internal malfunction
(memory check error)
Main switch
OFF Main switch
ON
Light ON for
1.4 seconds Light
OFF Light
OFF
Initialize
Engine trouble
warning light