Chery A21 2005, Service Manual, Page: 264 / 475

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.
Ω ±
℃
fault phenomeno n.
remove the plug, set the multimeter at the OHM position , the two
pens conn ect to the 2nd 、 3rd pin respectiv ely. The rating resistance will be 860 10 %
when it is 20 .
Fau lt description
Trou bleshoot
：
：
The sensor supply the crankshaft phase information to ECU, that's to distinguish the
compression TDC and exhaust TDC.
The 1st pin is the motor anod e, connect to the 66th and 67th pin of ECU;
The 2n d pin is the potentiometer cathode, conenct to the 78th pin of ECU;
The 3rd pin is the potentiome ter anode, connect to the 32nd pin of ECU, 5V power;
The 4th pin is the motor catho de, connec t to the 64th and 65th pin of ECU;
The 5th 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.
Description of e lectric throttle pin ：
（ 3 ） Crankshaft position sensor
（ 4 ） Phase sensor （ camshaft position sensor ）
Figure9-7 Cranks haft posit ion sensor and its ci rcuit diagram
can not start, emission exceed standard, fuel consumption increased
and so on.
Fault description ：
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.
15 34
B P
Crankshaft
Position Sensor
ECU
Crankshaft pos ition sensor
3 2 1
79
ECU
Figure9 -8 Phase sensor and its circu it diagram
Th ere are three pins of phase sensor:
th e 1st pin connect to g round; the
2nd is signal output,connect to the 79th
pin ; the 3rd pin connect to the power
anode.
Phase s ensor
Connect to main relay
Phase s ensor
Connect to ground
Figure9 -6 Electric throttle position sensor and its circuit diagram
54 38 64 67 66 65 78
1 4 2
5 6
3
32
Y/B
ECU/A 1/2
Sb V Y
L/W
Gr
Electronic Throttle Valve
ECU
Electric throttle
1# 、 2# pin is 5V reference voltage anode;
3# 、 5# pin is 5V reference voltage cathode;
4# 、 6# pin is signal output voltage signal.
Descripti on of the pins of throttle positio n sensor
：
accelarate pedal position sensor
ECU
Accelarate pedal
position sensor
（ 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.
16
3 2 35 40 16 33 36