Honda LEAD 110 2009 Service Manual page 49

TECHNICAL FEATURES
TP SENSOR
• TP sensor detects the opening degree of throttle valve.
• TP sensor consists of a variable resistor (volume) located on the same axis with throttle valve and a contact point
(brush) that moves above the variable resistor in accordance with the throttle valve.
• TP sensor detects the changes of brush angle synchronized with throttle valve movement by converting them into vari-
able resistance values. The input voltage from ECM becomes regulated by this varying resistance value and comes back
into ECM.
• Output voltage sent back to ECM is low when throttle opening is small. The voltage becomes higher as throttle opening
becomes larger.
• Depending on output voltage, ECM controls the following:
– determines basic discharge duration and cuts off fuel supply on deceleration (with CKP sensor)
– increases the amount of fuel injected on acceleration
TP SENSOR
OUTPUT VOLTAGE
4.76V
0.29V
THROTTLE VALVE OPENING DEGREE
2-12
ECM
5V
OUTPUT
VOLTAGE
FULL
FULL
CLOSE
OPEN
(IDLE)
SENSOR UNIT
TP SENSOR
VARIABLE RESISTOR (VOLUME)
CONTACT POINT (BRUSH)