Yamaha R15 2022, Service Manual

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8-82
FUEL INJECTION SYSTEM TROUBLESHOOTING
– + ELEC
Fault code No. P1604, P1605
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). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
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.
6 Malfunction in ECU. Replace the ECU. Service is finished.
7 Delete the fault code and check
that the engine trouble warning
light goes off. Confirm that the fault code has
a condition of “Recover” using
the YDT, and then delete the
fault code.
Fault code No. P1602
Item
Malfunction in ECU internal circuit (malfunction of ECU power cut-
off function).
Fault code No. P1604, P1605
Item
[P1604] Lean angle sensor: short to ground circuit is detected.
[P1605] Lean angle sensor: open or short to power circuit is detected.
Fail-safe system
Unable to start engine
Unable to drive vehicle
Diagnostic code No. 08
Tool display
Lean angle sensor output voltage
• 0.4–1.4 (upright)
• 3.7–4.4 (overturned)
Procedure Remove the lean angle sensor and incline it more than 50 degrees.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
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). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
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.
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). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
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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