Yamaha WR125R 2009, Service Manual

Page: 317 / 372

FUEL INJECTION SYSTEM
8-32
Engine trouble warning light indication and fuel injection system operation
* The warning light flashes when any one of the conditions listed below is present and the start switch
is pushed:
Checking the engine trouble warning light
The engine trouble warning light comes on for 3 seconds after the main switch has been set to “ON”. If
the warning light does not come on under these conditions, the warning light (LED) may be defective.
EAS22B1023
SELF-DIAGNOSTIC FUNCTION TABLE
If the ECU detects an abnormal signal from a sensor while the vehicle is being driven, the ECU illumi-
nates the engine trouble warning light and provides the engine with alternate operating instructions that
are appropriate for the type of malfunction.
When an abnormal signal is received from a sensor, the ECU processes the specified values that are
programmed for each sensor in order to provide the engine with alternate operating instructions that
enable the engine to continue to operate or stop operating, depending on the conditions.
Warning light indica-
tion
ECU operation
Fuel injection opera-
tion
Vehicle operation
Flashing*
Warning provided
when unable to start
engine
Operation stopped Cannot be operated
Remains on Malfunction detected
Operated with substi-
tute characteristics in
accordance with the
description of the mal-
function
Can or cannot be oper-
ated depending on the
fault code
19:
Blue/yellow ECU lead
(broken or disconnected)
39:
Fuel injector
(open or short circuit)
30:
Lean angle sensor
(latch up detected)
41:
Lean angle sensor
(open or short circuit)
33: Faulty ignition 50:
ECU internal malfunction
(memory check error)
a
b
c
c
d
a. Main switch “OFF”
b. Main switch “ON”
c. Engine trouble warning light off d. Engine trouble warning light on for 3 seconds