Yamaha YXR70FX Service Manual page 484

EBS01095
TROUBLESHOOTING
The four-wheel-drive motor indicator
light fails to come on.
Check:
1. main, ignition and four-wheel-drive motor
fuses
2. battery
3. main switch
4. four-wheel-drive motor relay 1
5. four-wheel-drive motor relay 2
6. four-wheel-drive motor relay 3
7. on-command four-wheel-drive motor switch
and differential gear lock switch
8. differential gear motor
9. wiring connection
(the entire 2WD/4WD selecting system)
TIP:
_
• Before troubleshooting, remove the following
part(s):
1. rear console
• Troubleshoot with the following special
tool(s).
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
2WD/4WD SELECTING SYSTEM
EBS01043
1. Main, ignition and four-wheel-drive motor
• Check the main, ignition and four-wheel-
• Are the main, ignition and four-wheel-drive
EBS01044
2. Battery
• Check the condition of the battery.
• Is the battery OK?
EBS01041
3. Main switch
• Check the main switch for continuity.
• Is the main switch OK?
9 - 54
fuses
drive motor fuses for continuity.
Refer to "CHECKING THE FUSES" in
chapter 3.
motor fuses OK?
YES
Replace the fuse(s).
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20 °C (68 °F)
YES
• Clean the battery
terminals.
• Recharge
place the battery.
Refer to "CHECKING THE SWITCHES".
YES
Replace
switch.
– +
ELEC
NO
NO
or re-
NO
the main