Troubleshooting Method - Yamaha Grizzly550 User Manual

Fault
Item
code No.
ECU internal malfunc-
50 tion
(memory check error)
Communication error with the meter
Fault
Item
code No.
ECU internal malfunc-
Er-1 tion
(output signal error)
ECU internal malfunc-
Er-2 tion
(output signal error)
ECU internal malfunc-
Er-3 tion
(output signal error)
ECU internal malfunc-
Er-4 tion
(input signal error)
EAS27400

TROUBLESHOOTING METHOD

The engine operation is not normal and the
engine trouble warning light comes on.
1. Check:
• Fault code number
M MMM M MMM M M MMM M M MMM M
a. Check the fault code number displayed on
the meter.
b. Identify the system with the malfunction. Re-
fer to "Self-Diagnostic Function table".
c. Identify the probable cause of malfunction.
Refer to "Diagnostic code table".
L LLL L LLL L L LLL L L LLL L
Symptom
Faulty ECU memory. (When this
malfunction is detected in the
ECU, the fault code number might
not appear on the meter.)
Symptom
No signals are received from the
ECU.
No signals are received from the
ECU within the specified duration.
Data from the ECU cannot be re-
ceived correctly.
Non-registered data has been re-
ceived from the meter.
M MMM M M MMM M MMM
L LLL L L LLL L LLL
9-35
FUEL INJECTION SYSTEM
Able / un-
able to start
Unable
Able / un-
able to start
Unable
Unable
Unable
Unable
2. Check and repair the probable cause of mal-
function.
Fault code No.
Check and repair.
Refer to "TROUBLE-
SHOOTING DE-
TAILS" on page 9-41.
Monitor the opera-
tion of the sensors
and actuators in the
diagnostic mode. Re-
fer to "Sensor opera-
tion table" and
"Actuator operation
table".
3. Perform ECU reinstatement action.
Refer to "Reinstatement method" of table in
"TROUBLESHOOTING DETAILS".
4. Turn the main switch to "OFF" and back to
"ON", then check the fault code number is not
displayed.
TIP
If fault codes are displayed, repeat steps (1) to
(4) until no fault code number is displayed.
Able / un-
able to
drive
Unable
Able / un-
able to
drive
Unable
Unable
Unable
Unable
Fault code No.
Check and repair.
Refer to "Self-Diag-
nostic Function ta-
ble".