Chery B11. Manual — part 75

CHERY Automobile Maintenance Manual

23

Chapter 3 Ignition control

system

I. Engine coolant temperature

sensor

Construction feature--It is a thermal

resistance installed in the outflow terminal of

engine cooling system, which will test the water

temperature and turn it to a signal. The signal is

transmitted to ECU. The signal is input to

calculate and correct the injection driving time.

Check

Caution: Not to touch the connector (resin part)

with tools when disassembling and installation.

(1) Disassemble the engine coolant temperature

sensor.

(2)Place the temperature sensor part of the coolant

temperature sensor in hot water to check

resistance.

Standard value:

0℃,resistance is 2.1—2.7KΩ；

20℃,resistance is 2.1—2.7KΩ；

40℃,resistance is 0.9—1.3Ω；

80℃,resistance is 0.26~0.36KΩ

（3）If the resistance deviate off the standard value

too much, the sensor should be replaced.

(4)Coat sealant on the rippling part.

Regulated sealant: 3M screw nut fastening

NO.4171 or equivalent.

(5) Installation coolant temperature sensor and

tighten to the assigned torque.

Fasten torque: 29N.m.

Coolant Temperature
sensor

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23

Error code NO.21engine coolant temperature
sensor system

Possible reasons

Check area

Ignition switch ON

60 seconds after ignition switch turned to On position or after

engine start

Setup condition

Sensor output voltage keeps above 4.6V for consecutive 4

seconds (equals to engine water temperature below－45℃).

Sensor output voltage keeps below 0.1V for consecutive 4

seconds (equals to engine water temperature 145℃ or more)

Check area

Ignition switch ON

Engine speed approx. above 50rpm

Setup condition

Sensor output voltage raises from below 1.6V (equals to

engine water temperature above 40℃) to above 1.6V (equals to
engine water temperature below 40℃)

Then the sensor output voltage keeps at above 1.6V for 5

minutes.

Engine coolant temperature sensor error

Connector of engine coolant temperature sensor contact

defeat, wiring open loop or short wiring

Engine ECU error

Check engine coolant temperature sensor

Abnormal

Repair

Normal

Measure connector for engine coolant
temperature sensor

Disassemble joint and check terminal

on the harness side

Check voltage between 1#Terminal and

the ground (ignition switch ON)

Normal：4.5～4.9V
Conductivity between 2# terminal and
ground
Normal: conductivity

Normal

Abnormal

Check D zone connector of harness ECU

Normal

Check failure

Abnormal

Check wiring between coolant temperature sensor and ECU。

Abnormal

Repair

Abnormal

Repair

Normal

Check engine coolant temperature sensor

harness joint

Abnormal

Repair

Normal

Check failure

Replace engine ECU

Abnormal

1

2

Connector for
coolant temperature sensor

Chery Automobile Maintenance Manual

24

T

II.

T

Crank angle sensor

Type—Hall type

Crank angle sensor of B11 vehicle

engine includes Hall flip-flop, permanent

magnets, and shielding board, etc. A group of

magnets are installed in the front of engine

cylinder, one of which is embedded in the

Hall flip-flop (electricity goes through current

vertically as shown). Shielding board is

installed in the front of crank and rotates with

it, between the two magnets. On the flange,

there are rectangular notches of same quantity

as cylinders. The notches generates

rectangular voltage wave by Hall flip-flop

through flux and output to ECU through

terminals and to control the working status

(spray nozzle driving time, ignition time, idle

airflow, connect and disconnect of EGR and

vapour pollution and control system) of the

executive devices by logic operation.

1—ground(normal conductivity)

2—connect to Pin D19 of ECU(IG: normal

status 4.8—5.2V when switch on)

3—connect to ignition switch (IG: normal

status is battery voltage when switch on)

D19---when motor on the voltage is 0.4—

4.0V;when idle the voltage is 1.5—2.5V.

Crank angle sensor
connector

1

2

3

Trigger signal

Hall
flip-flop

Shielding
plate

Supply current I

Permanent magnet

Chery Automobile Maintenance Manual

24

Error code NO.22 crank angle sensor system

Possible reasons

Check area

Rotate engine (tap engine)

Setup condition

Sensor output voltage has no variation for continuous 4

seconds (no input of pulse signal)

Crank angle sensor error

Harness connector contact failure, sensor disconnect or

short wiring

Engine ECU failure

Crank angle sensor connector

1

2

3

Measure crank angle sensor connector

Connect test wiring between joints：MB998478

Voltage between Terminal 2# and ground(motor on)normal：0.4～

4.0V

Voltage between Terminal 2# and ground(motor idle sped)normal：

1.5～2.5V

Norma

l

Replace engine ECU

Abnormal

Measure crank angle sensor connector
Disconnect joint and measure wiring side.
1.voltage between terminal 3# and ground (ignition
switch ON)
normal：battery voltage
2.voltage between terminal 2# and ground (ignition
switch ON)
normal：4.8～5.2V

Norma

l

Check sensor connector

Abnorm

al

Repair

Norm

al

Check failure

Abnormal

Replace crank angle sensor

1.Abnorm

al

Check harness between crank angle sensor and

control relay. If necessary, repair it.

2. abnormal

Check connector of harness
in D zone

Abnormal

Repair

Norm

al

Check failure

abnorma

l

Check wiring between crank

angle sensor and engine ECU

Abnormal

Repair

Norm

al

Replace engine ECU

3.Abnorm

al

Check harness between crank angle sensor and

ground. If necessary, repair it.