Yamaha 2002 TDM900, Service Manual

Page: 366 / 475

7-3
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)
FUEL INJECTION SYSTEM
FI
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, it becomes
stored in the ECU memory in the form of a fault code.
S
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.
S
If a malfunction in the system is detected by the self-diagnostic function, this mode provides an ap-
propriate substitute characteristic operation, and alerts the rider of the detected malfunction by illu-
minating a engine trouble warning light.
S
After the engine has been stopped, digital numbers representing the self-diagnostic fault codes ap-
pear 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
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
* 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.