Yamaha FJR1300(S), Supplementary Service Manual

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FI

FUEL INJECTION SYSTEM

SUBSTITUTE CHARACTERISTICS OPERATION CONTROL (FAIL-SAFE ACTION)

If the ECU detects an abnormal signal from a sensor while the motorcycle is being driven, the ECU
illuminates the engine trouble warning light and provides the engine with substitute characteristic
operation instructions that are appropriate for the type of the malfunction.
When an abnormal signal is received from a sensor, the ECU processes the specified values that
are programmed for every sensor, in order to provide the engine with substitute characteristics
operation instructions that enable the engine to continue to operate (or to stop its operation,
depending on circumstances).
The ECU takes fail-safe actions in two ways: one in which the sensor output is set to a prescribed
value, and the other in which the ECU directly operates an actuator. Details on the fail-safe actions
are given in the table below.

Table of substitute characteristic operation control by self-diagnostic fault code

Code No.

Item

Fail-safe action

Able/unable to 

start

Able/unable to 

drive

11

Cylinder identification 
sensor

Continues to operate the engine based on the results 
of the cylinder identification that existed up to that 
point.

Able

Able

12

Crankshaft position sen-
sor

• Stops the engine (by stopping the injection and 

ignition).

Unable

Unable

13
14

Intake air pressure sensor 
(open or short circuit) 
(pipe system)

• Fixes the intake air pressure to 760 mmHg.

Able

Able

15
16

Throttle position sensor 
(open or short circuit) 
(stuck)

• Fixes the throttle position sensor to fully open.

Able

Able

19

Broken or disconnected 
black/red lead of the ECU.

-- (No start)

Unable

Unable

21

Coolant temperature sen-
sor

• Fixes the coolant temperature to 60 °C.

Able

Able

22

Intake air temperature 
sensor

• Fixes the intake temperature to 20 °C.

Able

Able

24
31
32

O

2

 sensor 

(inactive) 
(compensation stuck to 
upper limit) 
(compensation stuck to 
lower limit)

--

Able

Able

33
34

Faulty ignition

• Fuel is cut off only to the cylinder in which a mal-

function is detected.

Able

(depending on 

the number of 

faulty cylinders)

Able

(depending on 

the number of 

faulty cylinders)

30
41

Lean angle cut-off switch 
(latch up detected) 
(open or short circuit)

• Turns OFF the fuel injection system relay of the fuel 

system.

Unable

Unable

42

Speed sensor, neutral 
switch

• Fixes the gear to the top gear.

Able

Able

43

Fuel system voltage 
(monitor voltage)

• Fixes the battery voltage to 12 V.

Able

Able

44

Error in writing the 
amount of CO adjust-
ment on EEPROM

--

Able

Able

50

ECU internal malfunction 
(memory check error)

--

Unable

Unable