Ecu's Self-Diagnostic Function - Yamaha YZF-R1P 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,
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
Warning light
indication
Blinking *
Continuous ON
* This control is effected when any one of the conditions listed below is present and the starter
switch is turned ON:
11: Cylinder identification sensor
12: Crankshaft position sensor
19: Sidestand switch
(open circuit in wire to ECU)
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.
Main switch Main switch
OFF ON
Engine trouble Light
warning light OFF
FUEL INJECTION SYSTEM
ECU's operating
condition
Warning control when
unable to start engine
Detecting malfunction
30: Lean angle cut-off switch
(latch up detected)
41: Lean angle cut-off switch
(open or short circuit)
50: ECU internal malfunction
(memory check error)
Light ON for
Light
1.4 seconds
OFF
Initialize
7 - 3
FI operating condition
Operation stopped
Gives driving
instructions with
substitute characteristics
in accordance with the
description of the
malfunction.
FI
Starting and driving
Unable
Able/Unable depending
on self-diagnostic fault
code