Yamaha FZ 25 2021 - Communication Error with the Yamaha Diagnostic Tool

6-36
–+
ELEC
SELF-DIAGNOSTIC FUNCTION AND
DIAGNOSTIC CODE TABLE
EAS31259
COMMUNICATION ERROR WITH THE YAMAHA DIAGNOSTIC TOOL
For details of the fault code, refer to “TROUBLESHOOTING METHOD” on page 6-25.
Power
supply
self-hold
P1602 Able Able
- Disconnected
battery terminal
- Open circuit in
harness be-
tween ECU and
main switch.
- Poor contact be-
tween ECU and
main harness.
- ECU malfunc-
tion.
Normal backup
power is not sup-
plied to ECU
Instable idling
High idling
Exhaust gas
deterioration
Poor starting
None in par-
ticular.
1Turn the
main switch
ON and start
the engine.
2Remove
the battery
terminals and
stop the en-
gine.
3Turn OFF
the main
switch and
connect the
battery termi-
nals.
After per-
forming 1 to
3 above
twice in suc-
cession, turn
ON the main
switch again.
LCD Display Symptom Probable cause of malfunction
Er-1 No signals are received from the
ECU.
-Defective coupler between service
tool and ECU.
-Open or short circuit in wire
harness between service tool and
ECU.
-Malfunction in service tool.
-Malfunction in ECU.
Er-2 No signals are received from the
ECU within the specified duration.
-Defective coupler between service
tool and ECU.
-Open or short circuit in wire
harness between service tool and
ECU.
-Malfunction in service tool.
-Malfunction in ECU.
Er-3 Data from the ECU cannot be
received correctly.
-Defective coupler between service
tool and ECU.
-Open or short circuit in wire
harness between service tool and
ECU.
-Malfunction in service tool.
-Malfunction in ECU.
Er-4 No signals are received from the
meter.
-Defective coupler between service
tool and ECU.
-
Open or short circuit in wire harness
between service tool and ECU.
-Malfunction in service tool.
-Malfunction in ECU.
Item
Abnormal
code
Start
engine
Travel
Probable
malfunction
Direct cause
Vehicle
symptoms
System
operation on
failure
Operation
example for
causing
abnormal
state
B9X-F8197-E0.book Page 36 Thursday, July 16, 2020 2:28 PM