Yamaha 2008 Tenere, Service Manual

Page: 303 / 399

7-19
FUEL INJECTION SYSTEM
ECU’S SELF-DIAGNOSTIC FUNCTION
The ECU is equipped with a self-diagnostic
function in order to ensure that the engine con-
trol system is operating normally. If this function
detects a malfunction in the system, it immedi-
ately operates the engine under substitute
characteristics and illuminates the engine trou-
ble warning light to alert the rider that a mal-
function has occurred in the system. Once a
malfunction has been detected, a fault code is
stored in the memory of the ECU.
1. Engine trouble warning light
• To inform the rider that the fuel injection sys-
tem is not functioning correctly, the engine
trouble warning light flashes when the start
switch is being pushed to start the engine.
• If a malfunction is detected in the system by
the self-diagnostic function, this mode pro-
vides an appropriate substitute characteristic
operation, and alerts the rider of the detected
malfunction by illuminating the engine trouble
warning light.
• After the engine has been stopped, the low-
est fault code number displays on the FI diag-
nostic tool. This fault code remains stored in
the memory of the ECU until it is deleted.
Engine trouble warning light fault code indication
Digit of 10: Cycles of 1 sec. ON and 1.5 sec. OFF.
Digit of 1: Cycles of 0.5 sec. ON and 0.5 sec. OFF.
<Example> 42
EAS00900
Engine trouble warning light indication and FI system operating condition
Engine condition Warning light FI operation Vehicle operation
indication
Flashing Operation stopped. Unable
Operates Remains ON Operated with substi- Able
(cranking with tute characteristics in
electric starter) accordance with the
description of the mal-
function.
Stopped
Flashing (indicate
— —
the fault code)
Light ON
Light OFF