Sym HD2 125 Service Manual page 82

TPS
W/BR
Y/B
G/R
Working voltage measurement
Throttle output signal
measurement - full closed
Throttle output signal
measurement - full
To this chapter contents
Functional Description:
Use ECU provided DC 5V power supply, has the three-pin coupler, one
●
for the power supply pin; one for a voltage output pin; one for a
grounding pin.
Its main component is a sophisticated type of variable resistor.
●
Installed on the throttle body beside the throttle through (the
●
accelerator) rotates, the output of linear voltage signal provided ECU
perception and judgement then throttle position (opening), and in this
signal with have the most appropriate fuel injection and ignition timing
control.
Pins Wire color
Upper White / Brown
Center Yellow / Black
Under Green / Red
Testing Procedures:
1. Sensor connected properly (using the probe tool), or can be removed
connector to voltage measurements (direct measurement).
2. Opened the main switch, but not to start engine.
3. Use "volteg meter" DC stalls (DCV) to check sensor voltage.
4. Confirmed working voltage:
Volteg meter negative access to the inlet pressure sensor third pin
●
(Green / Red).
Voltage meter positive access to the inlet pressure sensor first pin
●
(Yellow / Black).
5. Throttle output signal recognition (using the probe tool)
Volteg meter negative access to the sensor third pin (Green / Red).
●
Voltage meter positive access to the sensor first pin (white / Brown).
●
Measurements were full throttle at full throttle closed the values of
●
the output voltage.
Cautions
Attentions to the tools required close to the probe wire waterproof
●
apron penetrate skin and internal terminal before measurements to
the correct value.
Detection judge:
Working voltage value:
●
Full throttle voltage value:
●
Full throttle closed voltage value:
●
5. Fuel Injection System
Function
Signal output
5V voltage input
Ground
5.0±0.1V
0.6±0.02V
3.78±0.26V
5-19