Sakai SV540 Series, Shop Manual

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9-047
TROUBLESHOOTING
2-5-2. Machine speed cannot be changed 4/5
Engine check lamp must not be lighting. If engine check lamp lights, refer to “Service information” of engine
manufacturer.
Check whether ECO controller red LED shows any blink.
2) when red LED shows any blink.
Reference Fig.: 2-5-1
Number of
red LED blinks
Check point Check/Cause Action
1 long,
5 short
1. Connector Check motor rotation sensor (rear) connector and T/C
controller (terminal C1-P5, C1-P8, C1-P9 and C2-P2) for
corrosion, breakage, bending and looseness.
If any abnormality is found, connector is faulty.
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•
Replace connector or
terminal.
2. Harness Measure resistances between motor rotation sensor (rear)
and T/C controller terminal wires.
Motor rotation sensor (rear) terminal DIRECTION wire
Gw and T/C controller terminal C1-P5 wire Gw.
Motor rotation sensor (rear) terminal POwER wire Lg
and T/C controller terminal C1-P8 wire Lg.
Motor rotation sensor (rear) terminal PULSE wire GR
and T/C controller terminal C2-P2 wire GR.
Motor rotation sensor (rear) terminal GROUND wire L
and T/C controller terminal C1-P9 wire L.
Standard resistance : 10 Ω or less
If resistance is abnormal, harness is faulty.
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•
•
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Repair or replace
harness.
3. Motor
Rotation
Sensor
(Rear)
(1) when starter switch is ON, measure voltage between
motor rotation sensor (rear) terminal POwER inlet wire
Lg and chassis ground.
Standard voltage : 5.0
± 0.25
V
(2) Check that motor rotation sensor terminal (rear)
GROUND wire L is grounded.
(3) Start engine and rotate wheels. Measure pulse between
motor rotation sensor (rear) terminal PULSE outlet wire
GR and chassis ground.
Standard pulse : 78 pulses/rotation
(4) when starter switch is ON, measure voltage between
motor rotation sensor (rear) terminal DIRECTION outlet
wire GW and chassis ground.
Standard voltage : 0.2 to 0.6 V (when forward)
: 4.2 to 5.0 V (when reverse)
If above items (1) and (2) are OK and item (3) or (4) is
NG, motor rotation sensor (rear) is faulty.
•
Replace motor rotation
sensor (rear)
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