Sakai SV400D-2, Shop Manual

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9-021
ELECTRICAL SYSTEM TROUBLESHOOTING
2-3-4. Vehicle moves neither forward nor backward
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.
3. Neutral Relay (1) When the starter switch is ON, measure the voltage between
the neutral relay pin 1 inlet BrW wire and chassis ground.
Standard voltage: 12 V or more
(2) When the starter switch is ON, measure the voltage between
the neutral relay pin 3 inlet GW wire and chassis ground.
Standard voltage: 12 V or more
- If above items (1) and (2) are OK and electricity does not flow
through neutral relay pin 5, the neutral relay is faulty.
Replace the neutral
relay.
4. Neutral Holding
Relay
(1) When the starter switch is ON, measure the voltage between
the neutral holding relay pin 1 inlet LY wire and chassis
ground.
Standard voltage: 12 V or more
(2) When the starter switch is ON, measure the voltage between
the neutral holding relay pin 3 inlet R wire and chassis
ground.
Standard voltage: 12 V or more
- If above items (1) and (2) are OK and electricity does not flow
through neutral holding relay pin 5, the neutral holding relay is
faulty.
Replace the neutral
holding relay.
5. Neutral Solenoid - Disconnect harness and measure resistance of coil.
Standard resistance: 11.1 Ω
- If measured resistance is abnormal, the neutral solenoid is
faulty.
Replace the neutral
solenoid.
6. Parking Brake
Switch
(1) When the starter switch is ON, measure the voltage between
parking brake switch pin 3 inlet BrW wire and chassis
ground.
Standard voltage: 12 V or more
(2) When the starter switch is ON, measure voltage between
foot brake switch pin 1 inlet LgR wire and chassis ground.
Standard voltage: 12 V or more
- If above item (2) is OK and item (1) is NG, the parking brake
switch is faulty.
Replace the parking
brake switch.
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