Sakai SW354, Shop Manual

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10-100
TROUBLESHOOTING
SW504
4-2-4. Engine speed does not change when operating throttle lever
Engine warning lamp must not be lighting.
Refer to voltage measurement method when voltage is to be measured without disconnecting connector.
Reference Fig. : 4-2-1
Check point Check/Cause Action
1. Connector Check for corrosion, break, bend, or loosening on
potentiometer connector terminals.
If there are any above mentioned abnormalities, the
connector is faulty.
•
•
Replace connector or
terminal.
2. Potentiometer
(1) When starter switch is ON, measure voltage between
potentiometer teV1 wire W and potentiometer
terminal GND1 wire Br.
Standard voltage : 5
± 0.5
V
(2) When starter switch is ON, measure voltage between
potentiometer teV2 wire L and potentiometer
terminal GND2 wire B.
Standard voltage : 5
± 0.5
V
(3) When starter switch is ON, measure voltage between
potentiometer terminal OUT1 wire Y and potentiometer
terminal GND1 wire Br.
When throttle lever is at IDLE position
Standard voltage : 0.5 to 1.0 V
When throttle lever is at FULL position
Standard voltage : 4.0 to 4.5 V
(4) When starter switch is ON, measure voltage between
potentiometer terminal OUT2 wire G and potentiometer
terminal GND2 wire B.
When throttle lever is at IDLE position
Standard voltage : 4.0 to 4.5 V
When throttle lever is at FULL position
Standard voltage : 0.5 to 1.0 V
If above items (1) and (2) are OK and item (3) or (4) is
NG, potentiometer is faulty.
•
Replace potentiometer.
3. Harness Connecting
Between Terminals
Measure resistance of harness connecting between
terminals.
Standard resistance : 10 Ω or less
If resistance is abnormal, harness is faulty.
(NOTICE)
Because three-wire shield cable is used between
potentiometer and ECU, it is impossible to repair it.
It must be replaced.
•
•
•
Repair or replace
harness.
•
•