Chery B11. Manual — part 74
Chery Automobile Maintenance Manual
18
Note
Barometric pressure sensor is embedded
in airflow sensor, so refer to airflow
sensor connector for the joint terminal
of barometric pressure sensor.
7
6
5
4
3
2
1
Sensor Plug
Measure airflow sensor connector
l
Connect cable MB991709 between
terminals
l
Voltage between 2# terminal and ground
(Ignition switch ON)
Normal Status: 3.7
4.3V(Altitude Height:
0m)
3.2
3.8V(Altitude Height: 1200m)
Abnormal Measure airflow sensor harness joint.
Disconnect connector and measure
wiring side
1. Voltage between 1# and ground (Ignition
switch ON)
Normal status
4.8-5.2V
2. Conductivity between 5# and ground
Normal status
Conductible
Abnormal
Normal
Check airflow sensor connector
Abnormal
Normal
Check failure
Abnormal
Check wiring between barometric
pressure
s
ensor and check ECU
Abnormal
Repai
r
Normal
Replace airflow sensor
Check harness D zone joint
Abnorma
l
Repair
Normal
Check failure
Abnormal
Check the harness between
barometric pressure
sensor and ECU
Abnormal
Repai
r
Normal
Repai
r
Replace engine ECU
Norm
al
Check D zone connector of engine ECU
l
Connect connector
l
Voltage between D15# terminal and ground
(Ignition switch ON)
Normal Status: 3.7-4.3V(Altitude Height: 0m)
3.2-3.8V(Altitude Height: 1200m)
Normal
Check D connector of engine ECU harness
Abnormal
Repai
r
Norma
l
Check failure
Abnormal
Replace engine ECU
Abnormal
Check harness between
barometric
pressure sensor and engine ECU. If
necessary, repair it.
Chery Automobile Maintenance Manual
18
V. Idle Speed Motor
1. Idle Speed Motor Component
Position Figure
To keep idle speed status and operation
load of engine stable, stepper motor is moving
forward or backward according to pre-defined
control status, which controls the airflow
through throttle and keeps idle speed at best
status.
ISC system is in control and actual idle
speed is calculated by ECU. If actual idle speed
is different from target idle speed, you may
drive stepper motor speed feedback control in
order to adjust actual speed to target speed.
In order to process the load of air
conditioners etc., stepper motor (STM) position
control also may drive stepper motor to target
position.
Check
(1)Action sound check
Confirm engine coolant temperature is
below 20
.
Note: If engine coolant temperature is
above 20
, you may remove the harness joint
of engine coolant temperature sensor and
connect another coolant temperature sensor
which is below 20
with it.
When ignition switch is turned to ON
(don’t start on engine), check if there is action
sound from stepper motor.
If there is no action sound from stepper
motor, please check the drive circuit of stepper
motor. If drive circuit is OK, it maybe caused
by the defect of stepper motor or engine ECU.
(2)Coil resistance check
Standard Value:28-33 (at 20
)
Idle Speed Motor
EGR valve
Chery Automobile Maintenance Manual
21
VI. Throttle Body Structure
There are 3 inlet tubes of throttle body.
The airflow volume of main inlet tube is
controlled by throttle. The throttle axle is
connected to throttle sensor (throttle position
sensor and idle speed switch). The throttle
position change is turned into electric signal by
sensor and transferred into ECU.
The other two inlet tubes are bypass inlet
tubes. The airflow of one bypass inlet tube is
adjusted by helical pin valve. The airflow of the
other bypass inlet tube is adjusted by pin valve
driven by stepper motor and protected by
coolant temperature control valve.
Engine idle speed is controlled by ECU.
The pin valve is driven by stepper motor, which
may adjust airflow. No manual adjustment is
required.
The airflow is controlled by the position of
helical pin valve in bypass tube.
Because engine idle speed is controlled by total
airflow, the airflow of each tube affects each
other. Stepper motor is a mechanism that
controls airflow during engine idle speed
running, so it can’t be closed. If new engine is
running at idle speed (no load on engine), the
frequency of stepper motor is about 20 steps,
while after running-in, if it is running at idle
speed (no load on engine), the frequency of
stepper motor is about 10 steps.
Chery Automobile Maintenance Manual
20
VII. Throttle Body Cleanness
Throttle Body Cleanness
1
Start and preheat engine until
coolant temperature reaches 80
or
more, and then stop engine.
2
Remove inlet soft tube from throttle
body.
3
Stem bypass induction port of throttle
body.
Note
Don’t let cleanser into bypass
tube.
4
Inject the cleanser into valve through
throttle body induction port and keep
for 5 minutes.
5
After starting engine, racing several
times at high speed and then running at
idle speed for 1 minute. If instable idle
speed or engine flameout due to
stemmed bypass tube, you can open
throttle partially, which make engine
run well.
6
If deposit inside throttle fails to be
cleaned up, please repeat step (4) and
(5).
7
Pull out the plug of bypass inlet port.
8
Connect inlet soft tube.
9
Clear diagnostic code with MUT-II.
10
Adjust basic idle speed.
Note: If there is interrupted vibration during
engine running at idle speed after basic idle
speed adjustment, please keep battery
cathode disconnected for more than 10
seconds and then re-connect it, the engine
run at idle speed for about 10 minutes.
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