4. ELECTRONICALLY CONTROLLED CARBURETOR SYSTEM
SYM
4-8
Pin plug
Wire color
Function
Upper
white/brown
The signal input
Centre
yellow/black
Input 5v voltage
Lower
green/red
Earth wire
Testing Procedures:
1 . Use probe tool to connect or remove the sensor, the working voltage can be measured.
2. Turn on the main switch, but don’t start the engine.
3. Use "Multi-meter" direct current range, inspect the sensor resistance.
4. Working voltage confirmation
The cathode voltage-connect to the third pin of sensor
（
green/red
）
The anode connect to the second pin of sensor
（
yellow/black
）
5. Confirm the output signal of throttle (use probe tool
）
The cathode voltage-connect to the third pin of sensor
（
green/red
）
The anode connect to the first pin of sensor
（
white/brown
）
Measuring the output voltage while the throttle fully closed and fully open
Detection judge:
●
Working voltage value 5.0±0.1V.
●
Fully closed the output voltage values of throttle: 0.7±0.1V.
●
Fully opened the output voltage values of throttle: 3.9±0.1V.
Throttle position sensor standard inspection (use diagnostic software)
●
The output signal of throttle using the diagnostic software on the computer
●
Confirm the output signal of throttle—fully closed
●
Connect the diagnostic software with the vehicle and turn on the main switch but don’t start the engine.
●
Don’t rotate the throttle, view the APP PID of throttle position sensor whether it is correct.
●
Confirm the output signal of throttle—fully opened
●
Connect the diagnostic software with the vehicle and turn on the main switch but don’t start the engine.
●
Rotate the throttle fully opened, view the APP PID of throttle position sensor whether it is correct.
Treatment of abnormal phenomena:
●
The throttle position sensor is damage, or adapter connector poor contact.
●
Check whether there is any abnormal on main distribution line.
●
When the throttle position sensor is abnormal, suggest to replace new throttle position sensor and
recheck it.
Cautions
●
It’s forbidden to remove the throttle position sensor to be tested from the carburetor.
