Chery automobile Service Manual page 117

Troubleshooting: mainly check if there is short circuit
or open circuit on the connection between 4 lines on
sensor and ECU.
If there is short circuit, open circuit or grounding
between sensor wire harnesses.
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 US 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 UP 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.
Sectional view of intake pressure and
intake air temperature sensor
1 Seal ring
2Stainless steel bushing
3 PCB
4 Sensing element
Circuit diagram of throttle position sensor
G-8
5 Casing
6 Pressure bracket
7 Welded joint
8 Bonded joint
Throttle Position Sensor