Yamaha FZ 25 2021, Supplementary Service Manual

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ELEC
SELF-DIAGNOSTIC FUNCTION AND
DIAGNOSTIC CODE TABLE
Fault code No. P1400
Symptoms Open circuit in AIS or driver failure
Diagnostic code No.
48
Item
Item and components and
probable cause
Actions
Confirmation procedure after
actions
1 Connection of AIS 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). Defective connections

Re-
connect or replace the harness.
Turn the main switch to “ON”,
and then check the condition of
the fault code in diagnostic mode
of the Yamaha diagnostic tool.
Condition is Recovered

Go to
item 6 and finish the service.
Condition is Detected

Go to
item 2.
2 Connection of main 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). Defective connections

Re-
connect or replace the harness.
Turn the main switch to “ON”,
and then check the condition of
the fault code in diagnostic mode
of the Yamaha diagnostic tool.
Condition is Recovered

Go to
item 6 and finish the service.
Condition is Detected

Go to
item 3.
3 Harness continuity Open or short circuit

Recon-
nect or replace the harness.
ECU - AIS
AIS - Main switch
Turn the main switch to “ON”,
and then check the condition of
the fault code in diagnostic mode
of the Yamaha diagnostic tool.
Condition is Recovered

Go to
item 6 and finish the service.
Condition is Detected

Go to
item 4.
4 AIS malfunction Replace the AIS. Turn the main switch to “ON”,
and then check the condition of
the fault code in diagnostic mode
of the Yamaha diagnostic tool.
Condition is Recovered

Go to
item 6 and finish the service.
Condition is Detected

Go to
item 5.
5 AIS driver failure Replace the ECU. Refer to notes on ECU replace-
ment
Finish the service.
6 EG warning light, delete the
fault code. Delete this fault code with the
status “Recovered” in the
Yamaha diagnostic tool.
B9X-F8197-E0.book Page 63 Thursday, July 16, 2020 2:28 PM