Chery A21 2005 Service Manual page 264

（2）Electric throttle and accelarate pedal position sensor
The driver offer the engine real time torque requirement to ECU with the help of accelerate
pedal, ECU send the impulse signal to the electric throttle according to the information it
gained.Therefore, the motor in the electric throttle run and the throttle open to the required angle.
accelarate pedal position sensor
Descripti on of the pins of throttle positio n sensor：
1#、2# pin is 5V reference voltage anode;
3#、5# pin is 5V reference voltage cathode;
4#、6# pin is signal output voltage signal.
Figure9 -6 Electr ic throttle position sensor and its circuit diagram
Descr iption of e lectric thr ottle pin：
The 1st pin is the motor anod e, connect to the 66th and 67th pi n of ECU;
The 2n d pin is the potentiom eter cathode, conenct t o the 78th pin of ECU;
The 3r d pin is the potentiome ter anode, connect to t he 32nd pin of ECU, 5V power;
The 4t h pin is the motor catho de, connec t to the 64t h and 65th pin of ECU;
The 5t h pin is the signal output 1, conne ct to the 38 th pin of EC U.
The 6th pin is the signal out put 2, conn ect to the 5 4th pin of ECU.
（3）Crankshaft position sensor
16
ECU
3 2 35 40 16
Accelarate pedal
position sensor
ECU
64 67 66 65 78 38 54
Gr Sb Y V
L/W
1 4 2 5 6
Ele ctric throttle
Electronic Throttle Valve
The crankshaft position sensor is to supply engine speed、 crankshaft rotating angle and
TDC signal to ECU. I t is used to control the engine ignition and fuel eject timing.
33 36
Figure9- 7 Cranks haft posit ion sensor and its ci rcuit diag ram
Fau lt descript ion ：
Trou bleshoot： remove t he plug, set the multimeter at the OHM position , the two
pens conn ect to the 2nd、3rd pi n respectiv ely. The rat ing resistance will be 860
when it is 20 .
℃
（4）Phase sensor （camshaft position sensor）
The sensor supply the crankshaft phase information to ECU, that's to distinguish the
32 compression TDC and exhaust TDC.
Y/B
ECU/A 1/2
3
Figure9 -8 Phase sensor an d its circu it diagram
Fault description：
can not start, emission exceed standard, fuel consumption increased
and so on.
Troubleshoot：
（ connect the plug） start the ignition switch but not the engine, set the
multimeter at the DC volt position, connecting the two pens to the 3rd、1st pin of sensor, confirm
that there is a reference voltage of 12V. Start the engine, then check whether the 2nd pin signal is
normal by using the oscillograph.
the 1st pin connect to
screen
the 2 nd、 3rd pin
supply signal to ECU, and
connect to the 15th、34th
pin respectively.
Cr a nkshaft pos ition sensor
fault phenomeno n.
Th ere are three pins of phase sensor:
ECU
th e 1st pin connect to g round; the
2nd is signal output,connect to the 79th
Phase s ensor
pin ; the 3rd pin connect to the power
anode.
ECU
34 15
P B
Crankshaft
Position Sensor
Ω ± 10 %
Conne ct to ground
79
3 2 1
Phase s enso r
Connect to main relay