Yamaha SR400 2014, Service Manual

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FUEL INJECTION SYSTEM
7-23
EAS30570
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
number 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
flashes while the engine is being cranked at an engine start-up.
•
If a malfunction is detected in the system by the self-diagnostic function, the ECU provides an appro-
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, the lowest fault code number is indicated by the engine trouble
warning light (or displayed on the FI diagnostic tool). This number remains stored in the memory of
the ECU until it is deleted.
Engine trouble warning light fault code number 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
1
1. Engine trouble warning light
a. Light on
b. Light off
c. 1
d. 1.5
e. 0.5
f. 3