Sakai SV400D-2, Shop Manual

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9-015
ELECTRICAL SYSTEM TROUBLESHOOTING
2-3. Propulsion
Check the following items before troubleshooting.
No fuse blew.
2-3-1. Vehicle speed does not change
Reference Fig. : 2-3
Check point Check/Cause Action
1. Speed Change
Solenoid
- Disconnect harness and measure resistance of coil.
Standard resistance: 5.1 Ω
- If measured resistance is abnormal, the speed change
solenoid is faulty.
Replace the speed
change solenoid.
2. Speed Change
Switch
(1) When turning starter switch ON, measure the voltage
between speed change switch pin 1 inlet L wire and chassis
ground.
Standard voltage: 12 V or more
(2) When turning speed change switch ON (High) with starter
switch ON, measure the voltage between speed change
switch pin 2 inlet LW wire and chassis ground.
Standard voltage: 12 V or more
- If above item (1) is OK and item (2) is NG, the speed change
switch is faulty.
Replace the speed
change switch.
3. Harness Connecting
Between Terminals
- Check harness between terminals for continuity.
- No continuity indicates that harness is open or poorly
connected.
Repair or replace the
harness.
2-3-2. Brake does not release
The parking brake switch is turned OFF.
The foot brake switch is turned ON (the brake pedal is not depressed).
Reference Fig. : 2-3
Check point Check/Cause Action
1. F-R Lever Switch (1) When turning the forward/reverse lever to forward with the
starter switch is OFF, check the continuity between the F-R
lever switch COM terminal and NC terminal.
(2) When turning the forward/reverse lever to reverse with the
starter switch is OFF, check the continuity between the F-R
lever switch COM terminal and NC terminal.
- No continuity indicates normal condition. If any continuity is
present, the F-R lever switch is faulty.
Replace the F-R
lever switch.
2. Diode Unit (1) When the starter switch is ON and forward/reverse lever is
at neutral position, measure the voltage between the diode
unit pin I inlet W wire and chassis ground.
(2) When the starter switch is ON and forward/reverse lever is
at neutral position, measure the voltage between the diode
unit pin H inlet GW wire and chassis ground.
- If above item (1) is OK and (2) is NG, the diode unit is faulty.
Replace the diode
unit.
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