Engine Speed Does Not Change When Operating Throttle Lever - Sakai R2-4 Shop Manual

2-3-6. 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. : 2-3-1
Check point
1. Connector
2. Potentiometer
3. Harness Connecting
Between Terminals
Check/Cause
• Check for corrosion, break, bend, or loosening on
potentiometer connector terminals.
• If there are any above mentioned abnormalities, the
connector is faulty.
(1) when starter switch is ON, measure voltage between
potentiometer terminal +V1 wire R and potentiometer
terminal GND1 wire B.
Standard voltage : 5
(2) when starter switch is ON, measure voltage between
potentiometer terminal +V2 wire R and potentiometer
terminal GND2 wire B.
Standard voltage : 5
(3) when starter switch is ON, measure voltage between
potentiometer terminal SIG1 wire W and potentiometer
terminal GND1 wire B.
①when throttle lever is at IDLE position
Standard voltage : 0.5 to 1.0 V
②When 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 SIG2 wire W and potentiometer
terminal GND2 wire B.
①when throttle lever is at IDLE position
Standard voltage : 4.0 to 4.5 V
②When 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.
• 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.
V
± 0.5
V
± 0.5
TROUBLESHOOTING
Action
Replace connector or
terminal.
Replace potentiometer.
Repair or replace
harness.
10-027