Yamaha YZ450FA 2011, Owner'S Service Manual

Page: 303 / 318

7-41
FUEL INJECTION SYSTEM
2 Check the connection and locking con-
dition of the wire harness ECU coupler.
Disconnect the coupler and check the
pins. (bent or broken terminals and
locking condition of the pins) Poor connection
→
Properly
connect, repair, or replace.
Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then check the
fault code display.
Fault code number
is not displayed
→
Service is finished.
Fault code number
is displayed
→
Re-
fer to item 3.
3 Continuity of harness Open or short circuit
→
Re-
place.
Between FI diagnostic tool
coupler and ECU coupler.
(Light green–Light green)
Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then check the
fault code display.
Fault code number
is not displayed
→
Service is finished.
Fault code number
is displayed
→
Re-
fer to item 4.
4 FI diagnostic tool malfunction Replace the FI diagnostic
tool. Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then check the
fault code display.
Fault code number
is not displayed
→
Service is finished.
Fault code number
is displayed
→
Re-
fer to item 5.
5 Malfunction in ECU. Replace the ECU.
Fault code No. waiting for connection
Symptom Communication signal is not received.
Fail-safe system Able to start (unable when ECU is malfunctioning)
Able to drive vehicle (unable when ECU is malfunctioning)
Diagnostic code No. —
FI diagnostic tool dis-
play
—
Checking method —
Item Item/components and probable cause Check or maintenance job Checking method