Troubleshooting Method - Yamaha Vmax VMX17C 2009 Service Manual

a. Main switch "OFF"
b. Main switch "ON"
c. Engine trouble warning light off
ECU detects an abnormal signal from a sensor
If the ECU detects an abnormal signal from a sensor while the vehicle is being driven, the ECU illumi-
nates the engine trouble warning light and provides the engine with alternate operating instructions that
are appropriate for the type of malfunction.
When an abnormal signal is received from a sensor, the ECU processes the specified values that are
programmed for each sensor in order to provide the engine with alternate operating instructions that
enable the engine to continue to operate or stop operating, depending on the conditions.
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 faulty system with the fault code.
c. Identify the probable cause of the malfunc-
tion.
L LLL L LLL L L LLL L L LLL L
2. Check and repair the probable cause of mal-
function.
Fault code No.
Check and repair.
Refer to "TROUBLE-
SHOOTING DE-
TAILS" on page 8-43.
Monitor the opera-
tion of the sensors
and actuators in the
diagnostic mode. Re-
fer to "Sensor opera-
tion table" and
"Actuator operation
table".
a b
c
M MMM M M MMM M MMM
L LLL L L LLL L LLL
No fault code No.
Check and repair.
8-36
FUEL INJECTION SYSTEM
c
d
d. Engine trouble warning light on for 1.4
seconds
3. Perform fuel injection system reinstatement
action.
Refer to "Reinstatement method" of table in
"TROUBLESHOOTING DETAILS".
4. Turn the main switch to "OFF" and back to
"ON", then check that no fault code number is
displayed.
TIP
If fault codes are displayed, repeat steps (1) to
(4) until no fault code number is displayed.
5. Erase the malfunction history in the diagnos-
tic mode. Refer to "Sensor operation table
(Diagnostic code No. D:62)".
TIP
Turning the main switch to "OFF" will not erase
the malfunction history.