Ecu's Self-Diagnostic Function - Yamaha MT-03 Service Manual

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
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
Light ON
Light OFF
EAS00900
Engine trouble warning light indication and FI system operating condition
Engine condition
Operates
(cranking with
electric starter)
Stopped
Warning light
indication
Flashing
Remains ON
Flashing (indicate
the fault code)
7-19
FUEL INJECTION SYSTEM
• 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.
FI operation
Operation stopped.
Operated with substi-
tute characteristics in
accordance with the
description of the mal-
function.
—
Vehicle operation
Unable
Able
—