Yamaha 2004 YP400 Service Manual page 325

Fault code No. Er-2
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 har-
ness and/or sub lead.
3 Malfunction in meter
4 Malfunction in ECU
Fault code No. Er-3
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 har-
ness and/or sub lead.
3 Malfunction in meter
4 Malfunction in ECU
Fault code No. 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 har-
ness and/or sub lead.
3 Malfunction in meter
4 Malfunction in ECU
FUEL INJECTION SYSTEM
Symptom No signals are received from the ECU within the specified duration.
Operation item and countermeasure
If there is a malfunction, repair it and connect it
securely.
Main wiring harness ECU coupler
Sub-wire harness coupler
Repair or replace if there is an open or short circuit.
Between meter coupler and ECU coupler
yellow/blue – yellow/blue
Replace the meter.
Replace the ECU.
Symptom Data from the ECU cannot be received correctly.
Operation item and countermeasure
If there is a malfunction, repair it and connect it
securely.
Main wiring harness ECU coupler
Sub-wire harness coupler
Repair or replace if there is an open or short circuit.
Between meter coupler and ECU coupler
yellow/blue – yellow/blue
Replace the meter.
Replace the ECU.
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.
Main wiring harness ECU coupler
Sub-wire harness coupler
Repair or replace if there is an open or short circuit.
Between meter coupler and ECU coupler
yellow/blue – yellow/blue
Replace the meter.
Replace the ECU.
7 - 24
FI
Reinstatement
method
Reinstated if nor-
mal signal is
received from the
ECU when the
main switch is set
to ON.
Reinstatement
method
Reinstated if nor-
mal signal is
received from the
ECU when the
main switch is set
to ON.
Reinstatement
method
Reinstated if nor-
mal signal is
received from the
ECU when the
main switch is set
to ON.