Fault Code Er-4 - Yamaha FZ8NA Service Manual

Fault code No.
Item
Fail-safe system
Diagnostic code No.
Meter display
Procedure
Item/components and
probable cause
4 Abnormal meter unit opera-
tion
5 ECU malfunction
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Meter display
Procedure
Item/components and
probable cause
1 Connection of meter coupler
Check the connection of the
coupler is secure.
Remove the coupler, and
check each pin (for bending,
wear, or locking).
2 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).
3 Continuity of wire harness
Er-3
ECU internal malfunction (output signal error): data from the ECU
cannot be received correctly.
Able to start engine
Able to drive vehicle
—
—
—
Check or maintenance job
Replace the meter unit.
Replace the ECU.
Er-4
ECU internal malfunction (input signal error): non-registered data
has been received from the meter.
Able to start engine
Able to drive vehicle
—
—
—
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.
Open or short circuit → Con-
nect it securely, or repair/
replace the wire harness.
Yellow/blue–Yellow/blue
FUEL INJECTION SYSTEM
8-105
Sensor inspection proce-
dure
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Sensor inspection proce-
dure
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.