Fault code No.
Item
3
Check the main fuse.
4
Wire harness continuity
between starter relay and ECU
coupler.
5
Wire harness continuity
between starter relay and bat-
tery.
6
Malfunction in ECU.
7
Delete the fault code and check
that the engine trouble warning
light goes off.
Fault code No. P1604, P1605
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
P1602
Malfunction in ECU internal circuit (malfunction of ECU power cut-
off function).
Blown fuse Replace the fuse. Push the ON/start switch, and
Open or short circuit Replace
the wire harness.
Between starter relay and ECU
coupler.
red–red
Open or short circuit Replace
the wire harness.
Between starter relay and bat-
tery.
red–red
Replace the ECU.
Confirm that the fault code has
a condition of "Recovered"
using the Yamaha diagnostic
tool, and then delete the fault
code.
P1604, P1605
[P1604] Lean angle sensor: ground short circuit detected.
[P1605] Lean angle sensor: open or power short circuit.
Unable to start engine
Unable to drive vehicle
08
Lean angle sensor output voltage
• 0.4–1.4 (upright)
• 3.7–4.4 (overturned)
Remove the lean angle sensor and incline it more than 65 degrees.
Maintenance job
8-101
FUEL INJECTION SYSTEM
then check the condition of the
fault code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered" Go
to item 7 and finish the service.
Condition is "Detected" Go to
item 4.
Push the ON/start switch, and
then check the condition of the
fault code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered" Go
to item 7 and finish the service.
Condition is "Detected" Go to
item 5.
Push the ON/start switch, and
then check the condition of the
fault code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered" Go
to item 7 and finish the service.
Condition is "Detected" Go to
item 6.
Service is finished.
Confirmation of service com-
pletion