Ecu Internal Malfunction (Output Signal Error): No Signals Are Received From The Ecu Within The Specified Duration - Yamaha YZF-R25 Service Manual

Fault code No.
Item
1 Connection of Yamaha diagnos-
tic tool coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check it (bent or broken termi-
nals and locking condition).
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 Yamaha diagnostic
tool.
5 Malfunction in ECU.
Fault code No. Er-2
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
Waiting for connection (Yamaha diagnostic tool)
ECU (engine control unit) internal malfunction (output signal error):
Signals cannot be transmitted between the ECU and Yamaha diag-
nostic tool.
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 Yamaha diagnostic
tool.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-81.
Er-2
ECU (engine control unit) internal malfunction (output signal error):
no signals are received from the ECU within the specified duration.
Able to start engine
Able to drive vehicle
—
—
—
Maintenance job
8-64
FUEL INJECTION SYSTEM
Connect the Yamaha diagnostic
tool and 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.
Connect the Yamaha diagnostic
tool and 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.
Connect the Yamaha diagnostic
tool and 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.
Connect the Yamaha diagnostic
tool and 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