Troubleshooting Method - Yamaha 2009 XP500Y TMAX Service Manual

Fault
Item
code No.
ECU (engine control
unit) 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
2. Checking and repair the probable case of
malfunction.
Fault code No.
Check and repair.
Refer to "TROUBLE-
SHOOTING DE-
TAILS" on page 8-40.
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 (engine control unit) reinstate-
ment action.
Refer to "Reinstatement method" of table in
"TROUBLESHOOTING DETAILS" on page
8-40.
4. Turn the main switch to "OFF" and back to
"ON", and then check that no fault code num-
ber is displayed.
TIP
If fault codes are displayed, repeat steps (1) to
(4) until no fault code number is displayed.
Non-registered data has been re-
ceived from the meter.
M MMM M M MMM M MMM
L LLL L L LLL L LLL
No fault code No.
Check and repair.
Refer to "Self-Diag-
nostic Function ta-
ble".
8-34
FUEL INJECTION SYSTEM
Symptom
5. Erase the malfunction history in the diagnos-
tic mode. Refer to "Sensor operation table
(Diagnostic code No.62)".
TIP
Turning the main switch to "OFF" will not erase
the malfunction history.
The engine operation is not normal but the
engine trouble warning light does not come
on.
1. Check the operation of following sensors and
actuators in the diagnostic mode. Refer to
"Sensor operation table" and "Actuator oper-
ation table".
01: Throttle position sensor (throttle angle)
30: Ignition coil
36: Fuel injector #1
37: Fuel injector #2
If a malfunction is detected in the sensors or
actuators, repair or replace all faulty parts.
If no malfunction is detected in the sensors
and actuators, check and repair the inner
parts of the engine.
Able / un-
Able / un-
able to
able to start
drive
Unable Unable