Ecu Self-Diagnostic Function - Yamaha XJR1300 2007 Service Manual

EAS27350

ECU SELF-DIAGNOSTIC FUNCTION

The ECU is equipped with a self-diagnostic function in order to ensure that the fuel injection 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, a fault code is
stored in the memory of the ECU.
To inform the rider that the fuel injection system is not functioning, the engine trouble warning light
G
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, the ECU provides an appro-
G
priate substitute characteristic operation, and alerts the rider of the detected malfunction by illuminat-
ing the engine trouble warning light.
After the engine has been stopped, errors are displayed on the LCD of the odometer in order from the
G
latest error code number. Once a fault code has been displayed, it remains stored in the memory of
the ECU until it is deleted.
Engine trouble warning light indication and FI system operation
Warning light
indication
Flashing
Remains on
* The warning light flashes when any one of the conditions listed below is present and the start switch is pushed:
Crankshaft position sensor
12:
(Normal signal not emitted)
Sidestand switch
19:
(Open circuit wireharness to ECU)
Lean angle sensor
30:
(Latch up detected)
Checking for a defective engine trouble warning light bulb
The engine trouble warning light comes on for 1.4 seconds after the main switch has been turned to
"ON". And when the start switch is being pushed. If the warning light does not come on under these
conditions, the warning light bulb may be defective.
a b
c
a. Main switch OFF
b. Main switch ON
c. Light OFF
ECU operation
Warning provided
when unable to start
engine
Malfunction detected
d c
FUEL INJECTION SYSTEM
FI operation
Operation stopped
Operated with substi-
tute characteristics in
accordance with the
description of the mal-
function
Lean angle sensor
41:
(open or short-circuit)
ECU internal malfunction
50:
(faulty ECU memory)
d. Light ON for 1.4 seconds
7-27
Vehicle operation
Cannot be operated
Can or cannot be oper-
ated depending on the
fault code