Yamaha YZF-R1S Service Manual page 378

Fault code No.
Er-1
Er-2
Er-3
Er-4
Used diagnostic code No. – –
Order Inspection operation item and probable
cause
1 Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.
2 Open or short circuit in wiring harness
and / or sub lead.
3 Malfunction in meter
4 Malfunction in ECU
FUEL INJECTION SYSTEM
Symptom No signal are received from the ECU.
Symptom No signal are received from the ECU within the specified duration.
Symptom Data from the ECU cannot be received correctly.
Symptom Non-registered data has been received from the meter.
Operation item and countermeasure
If there is a malfunction, repair it and connect it
securely.
Cylinder identification sensor coupler
Main wiring harness ECU coupler
Sub-wire harness coupler
Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
Yellow / Blue – Yellow / Blue
Black / White – Black / White
Replace the meter.
Replace the ECU.
7-34
FI
Reinstatement
method
Reinstated by
turning the
main switch
ON.