Yamaha FZ6-ST Supplementary Service Manual - page 394
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FUEL INJECTION SYSTEM
FI
Fault code No.
Er-4
Symptom
Non-registered data has been received from the meter.
Used diagnostic code No. – –
Order
Inspection operation item and probable
cause
Operation item and countermeasure
Reinstatement
method
1
Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.
If there is a malfunction, repair it and connect it
securely.
Main wiring harness ECU coupler
Sub-wire harness coupler
Reinstated by
turning the
main switch
ON and
receives a
2
Open or short circuit in wiring harness
and / or sub lead.
Repair or replace if there is an open or short
circuit.
Between meter coupler and ECU coupler
yellow / blue - yellow / blue
black / white - black / white
normal signal.
3
Malfunction in meter
Replace the meter.
4
Malfunction in ECU
Replace the ECU.