Maintenance Manual for Chery·Windcloud M7.9.7 EFI System
2. Throttle Position Sensor
Purpose: this sensor is designed to provide
ECU with information of throttle angle. As
per such information, ECU obtains engine
load information and operating mode
information (for instance: start-up, idle
speed, reverse, part load and full load) as
well as acceleration and deceleration
information. This sensor is three-wire style,
and the throttle opening can be detected by
ECU via monitoring voltage variation.
Composition and principle: Consisting of
two compass sliding contact resistors and
two sliding contact arms, throttle position
sensor is an angle sensor that outputs linear
signals. The axes of contact arms are on the
same axial line with throttle axis, with 5V
power supply voltage U
S being applied to
both ends of each contact resistor. When
throttle turns, contact arms turn along with it
and move on sliding contact resisters,
educing potential of contacts U
P as output
voltage. This sensor is actually an angle
potentiometer.
Failure diagnosis: ECU monitors throttle
angle, and detects sensor failure when
output signal exceeds upper or lower limit,
in which case engine will work in failure
mode, and fault indicating lamp will go on.
Installation: allowable tightening torque
for fastening screw is 1.5Nm-2.5Nm.
Throttle position sensor
Circuit diagram of throttle position sensor
Pins:
1 sensor signal ground (ECU17#)
2 5V power (ECU32#)
3 sensor signal (ECU16#)
Troubleshooting: mainly check if there is
short circuit or open circuit on the
connection between 3 lines on senosr and
ECU.
Check to see if there is short circuit, open
circuit or grounding between sensor wire
harnesses.
2
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