Chery A11 2003, Repair Manual, Page: 646 / 784

load and accelerating/decelerating operating conditions, and carry out fuel injection volume
control corresponding with throttle opening. Throttle position sensor includes a
potentiometer, and the moving parts is operated by throttle shaft. During operation, ECU
supply 5V voltage to sensor and measured parameter is variable of throttle opening from
minimum to maximum.
Operation Operational theory of throttle position sensor is shown as fig 7.
(3) TMAP sensor (air intake temperature, pressure sensor)
★
TMAP sensor combined air intake temperature sensor and air intake pressure
sensor .
Air intake pressure sensor is an important sensor, which utilize pressure-resistance effect
of semi-conductor element, transferring pressure change in intake manifold to voltage
change.
Air intake temperature sensor is used to measure air intake temperature, which is a
negative temperature coefficient (NTC) resistance thermo-sensitive element.And the
resistance decrease with temperature increasing.
(4) Crankshaft speed and position sensor
This system adopts electromagnetic crankshaft speed and position sensor with inner
composition of watered magnet round cylinder and coil. Crankshaft speed and position
sensor are fixed on transmission housing, corresponding with sensor signal gear tooth.
Sensor signal gear has 60-2 teeth. When 1-4 cylinder is in Top Dead Center position
，
the
sensor is at the 20
th
tooth counting from signal gear absent tooth; and when 2-3 cylinder is
in Top Dead Center position
，
the sensor is at the 50
th
tooth counting from signal gear absent
tooth.
Fig 7. Crankshaft speed and position sensor Operation Theory
1. Crankshaft speed and position sensor 2. Signal gear 3. Corresponding signal with 2nd absent tooth 4. Signal
Besides identification of Top Dead Center position
，
signal can be used by ECU for:
-Managing of ignition (ignition advance angle and charging duration)
；
-generating rotaional speed signal
；
-Confirming synchronization of each engine revolution by identifying the two absent
teeth.
Under the condition of other factors not changing, the peak value of sensor output
voltage is determined on the distance between crankshaft rational speed and position
sensor and gear tooth. The clearance between the head of crankshaft rotational speed and
position sensor and the top of signal gear tooth is 1
±
0.5mm.
(6) Oxygen sensor