Ecu Internal Malfunction (Output Signal Error): Non-Registered Data Has Been Received From The Meter - Yamaha YZF-R25 Service Manual

Fault code No.
Item
1 Connection of meter assembly
coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
2 Connection of wire harness
ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
3 Wire harness continuity.
4 Defective meter assembly.
5 Malfunction in ECU.
Fault code No. Er-4 (fault code display)
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
Er-3
ECU (engine control unit) internal malfunction (output signal error):
data from the ECU cannot be received correctly.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Open or short circuit → Replace
the wire harness.
Between ECU coupler and
Yamaha diagnostic tool coupler.
yellow/blue–yellow/blue
Between Yamaha diagnostic
tool coupler and meter assem-
bly coupler.
yellow/blue–yellow/blue
Replace the meter assembly.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-81.
Er-4 (fault code display)
ECU (engine control unit) internal malfunction (input signal error):
non-registered data has been received from the meter.
Able to start engine
Able to drive vehicle
—
—
—
Maintenance job
8-66
FUEL INJECTION SYSTEM
Turn the main switch to "ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 2.
Turn the main switch to "ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 3.
Turn the main switch to "ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 4.
Turn the main switch to "ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 5.
Confirmation of service com-
pletion