Yamaha FZ8NA Service Manual page 480

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Fault code No.
Item
Fail-safe system
Diagnostic code No.
Actuation
d:36
Procedure
Actuation
d:37
Procedure
Actuation
d:38
Procedure
Actuation
d:39
Procedure
Item/components and
probable cause
4
Connection of wire harness
ECU coupler
Check the connection of the
coupler is secure.
Remove the coupler and
check each pin (for bending,
wear, or locking).
5
Connection of fuel injection
system sub-wire harness
coupler
Check the connection of the
coupler is secure.
Remove the coupler, and
check each pin (for bending,
wear, or locking)
39
Injector: open circuit detected. (no normal signals are received from
the injector.)
Able to start engine (depending on the number of faulty cylinders)
Able to drive vehicle (depending on the number of faulty cylinders)
d:36, d:37, d:38, d:39
Actuates injector #1 five times at one-second intervals.
Illuminates the engine trouble warning light.
Check that injector #1 is actuated five times by listening for the
operating sound.
Actuates injector #2 five times at one-second intervals.
Illuminates the engine trouble warning light.
Check that injector #2 is actuated five times by listening for the
operating sound.
Actuates injector #3 five times at one-second intervals.
Illuminates the engine trouble warning light.
Check that injector #3 is actuated five times by listening for the
operating sound.
Actuates injector #4 five times at one-second intervals.
Illuminates the engine trouble warning light.
Check that injector #4 is actuated five times by listening for the
operating sound.
Check or maintenance job
Poor connection → Connect it
securely, or repair/replace the
wire harness.
Poor connection → Connect it
securely, or repair/replace the
wire harness.
FUEL INJECTION SYSTEM
8-85
Sensor inspection proce-
dure
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.

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