Yamaha MX775, Service Manual

Page: 154 / 188

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TR
OUBLESH
OO
TIN
G
ENGINE DOES NOT START
ELECTRIC STARTING SYSTEM
The starter motor fails to turn.
FUEL INJECTION SYSTEM
(Refer to “FUEL INJECTION SYSTEM” on page 5-3)
FUEL PUMP SYSTEM
If the high-pressure fuel pump fails to operate.
No. Checking steps Possible remedy
1
Check the fuses.
(Refer to “CHECKING THE FUSES” on page 5-27)
Replace the fuse(s).
2 Check the battery.
• Clean the battery terminals.
• Recharge or replace the battery.
3
Check the starter motor operation.
(Refer to “CHECKING THE STARTER MOTOR OPERA-
TION” on page 5-36)
If the starter motor operates normally,
the starter motor is OK.
4
Check the starter motor.
(Refer to “ELECTRIC STARTING SYSTEM” on page 5-37)
Repair or replace the starter motor.
5 Check the main switch. Replace the main switch.
6
Check the entire starting system’s wiring.
(Refer to “CIRCUIT DIAGRAM” on page 5-1) Properly connect or repair the starting
system’s wiring.
7 The starting system circuit is OK. —
No. Checking steps Possible remedy
1
Check the fuses.
(Refer to “CHECKING THE FUSES” on page 5-27)
Replace the fuse(s).
2 Check the battery.
• Clean the battery terminals.
• Recharge or replace the battery.
3 Check the main switch. Replace the main switch.
4
Check the fuel pumps.
(Refer to “FUEL PUMPS” on page 4-1)
Replace the fuel pumps.
5
Check the entire high-pressure fuel pump system’s wiring.
(Refer to “CIRCUIT DIAGRAM” on page 5-1) Properly connect or repair the high-
pressure fuel pump system’s wiring.
6 Replace the ECU. —