Yamaha R15 2022 Service Manual page 415

FUEL INJECTION SYSTEM TROUBLESHOOTING
Fault code No.
Item
5 Connection of 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).
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
1 Connection of lean angle sensor
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 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).
P1602
Malfunction in ECU internal circuit (malfunction of ECU power cut-
off function).
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Replace the ECU.
Confirm that the fault code has
a condition of "Recover" using
the YDT, and then delete the
fault code.
P1604, P1605
[P1604] Lean angle sensor: short to ground circuit is detected.
[P1605] Lean angle sensor: open or short to power circuit is detected.
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 50 degrees.
Maintenance job
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.
8-82
ELEC
Turn the main switch to "ON",
crank the engine, and then turn
the main switch to "OFF".
Perform this procedure 2 times,
and then check the fault code
using the malfunction mode of
the YDT.
Condition is "Recover" → Go to
item 7 and finish the service.
Condition is "Malfunction" → Go
to item 6.
Service is finished.
Confirmation of service com-
pletion
Turn the main switch to "ON",
then to "OFF", and then back to
"ON".
Check the fault code using the
malfunction mode of the YDT.
Condition is "Recover" → Go to
item 6 and finish the service.
Condition is "Malfunction" → Go
to item 2.
Turn the main switch to "ON",
then to "OFF", and then back to
"ON".
Check the fault code using the
malfunction mode of the YDT.
Condition is "Recover" → Go to
item 6 and finish the service.
Condition is "Malfunction" → Go
to item 3.
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