Yamaha Wolverine YX70EPNG, Service Manual

Page: 413 / 503

FUEL INJECTION SYSTEM
9-38
EBS30279
TROUBLESHOOTING METHOD
The engine operation is not normal and the
engine trouble warning light comes on.
1. Check:
• Fault code number
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
a. Check the fault code number displayed on
the multi-function meter.
b. Identify the faulty system with the fault code.
c. Identify the probable cause of the malfunc-
tion.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
2. Check and repair the probable cause of mal-
function.
3. Perform the reinstatement action for the fuel
injection system.
Refer to “Confirmation of service completion”
of table in “TROUBLESHOOTING DETAILS
(FUEL INJECTION SYSTEM)” on page 9-41.
4. Turn the main switch to “ ” (off) and back to
“ ” (on), then check that no fault code num-
ber is displayed.
TIP
If another fault code are displayed, repeat steps
(1) to (4) until no fault code number is displayed.
5. Erase the malfunction history in the diagnos-
tic mode (code No. 62). Refer to “SELF-DI-
AGNOSTIC FUNCTION AND DIAGNOSTIC
CODE TABLE” on page 10-7.
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 the following sensors
and actuators in the diagnostic mode.
Refer to “TROUBLESHOOTING DETAILS
(FUEL INJECTION SYSTEM)” on page 9-41
and “SELF-DIAGNOSTIC FUNCTION AND
DIAGNOSTIC CODE TABLE” on page 10-7.
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 inner parts of
the engine.
Fault code No. No fault code No.
Check and repair. Refer
to “TROUBLESHOOT-
ING DETAILS (FUEL
INJECTION SYS-
TEM)” on page 9-41.
Monitor the operation of
the sensors and actua-
tors in the diagnostic
mode.
Refer to “TROUBLE-
SHOOTING DETAILS
(FUEL INJECTION
SYSTEM)” on page
9-41 and “SELF-DIAG-
NOSTIC FUNCTION
AND DIAGNOSTIC
CODE TABLE” on page
10-7.
Check and repair.
01: Throttle position sensor signal (throttle angle)
30: Ignition coil
36: Fuel injector
48: Air induction system solenoid