Chery Tiggo 5 (T21). Manual — part 339

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Diagnosis Procedure

Use the circuit diagram as a guide to perform the following procedures:
a. Turn ignition switch to LOCK.
b. Disconnect the negative battery cable.
c. Disconnect the HVAC control panel assembly connector K-012.
d. Disconnect the inner/outer circulation damper motor connector K-006.
e. Check if wire harnesses are worn, pierced, pinched or partially broken.
f. Look for broken, bent, protruded or corroded terminals.
g. Check if related connector pins are in good condition.

a. Remove the inner/outer circulation damper motor.
b. Install the new inner/outer circulation damper motor to vehicle.
c. Use X-431 3G diagnostic tester to check if DTCs are still output.

DTC Code

DTC Definition

DTC Detection

Condition

Possible Cause

B2172

AC Recirculation
Actuator

Ignition switch ON

 Inner/Outer circulation damper motor
 Wire harness and connector
 HVAC control panel

CAUTION

 When performing electrical equipment diagnosis and test, always refer to the circuit diagram for related

circuit and component information.

1

Check wire harness and connector

Repair or replace A/C wire harness and
connector

2

Check inner/outer circulation damper motor

Replace inner/outer circulation damper
motor

NG

OK

NO

YES

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a. Turn ignition switch to LOCK.
b. Disconnect the negative battery cable.
c. Disconnect the HVAC control panel assembly connector

K-012.

d. Disconnect the inner/outer circulation damper motor

connector K-006.

e. Using a digital multimeter, check for continuity between

terminals of connector K-012 and connector K-006 to
check if there is an open in inner/outer circulation damper
motor according to the table below.
Standard Condition

3

Check wire harness and connector (HVAC control panel assembly - inner/outer circulation
damper motor)

RT21311220

-

+

K-012

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

K-006

4 1

5 2

6 3

Multimeter

Connection

Condition

Specified

Condition

K-012 (5) - K-006

(1)

Always

Continuity

K-012 (1) - K-006

(2)

Always

Continuity

K-012 (7) - K-006

(3)

Always

Continuity

K-012 (6) - K-006

(4)

Always

Continuity

K-012 (8) - K-006

(6)

Always

Continuity

Repair or replace A/C wire harness and
connector

NG

OK

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a. Turn ignition switch to LOCK.
b. Disconnect the negative battery cable.
c. Disconnect the HVAC control panel assembly connector

K-012.

d. Using a digital multimeter, check for continuity between

connector K-012 and body ground to check if inner/outer
circulation damper motor circuit is short to ground
according to the table below.
Standard Condition

a. Reconnect all disconnected connectors securely.
b. Connect the negative battery cable.
c. Turn ignition switch ON.
d. Use X-431 3G diagnostic tester (the latest software) to record and clear DTCs stored in the HVAC control

panel assembly.

e. Turn ignition switch to LOCK and wait for a few seconds.
f. Turn ignition switch ON.
g. Use X-431 3G diagnostic tester to read DTCs stored in the HVAC control panel assembly again.

4

Check wire harness and connector (HVAC control panel assembly - body ground)

RT21311230

-

+

K-012

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Multimeter

Connection

Condition

Specified

Condition

K-012 (1) - Body

ground

Always

No continuity

K-012 (5) - Body

ground

Always

No continuity

K-012 (6) - Body

ground

Always No

continuity

K-012 (7) - Body

ground

Always

No continuity

K-012 (8) - Body

ground

Always

No continuity

Repair or replace A/C wire harness and
connector

NG

5

Reconfirm DTCs

OK

Replace HVAC control panel assembly

NG

System operates normally

OK

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ON-VEHICLE SERVICE

On-vehicle Inspection

HINT:
The A/C refrigerant lines and hoses are used to transfer refrigerant among the A/C system components. Any
twist or bent in the refrigerant lines and hoses will reduce the performance of A/C system and refrigerant flow
in system.

There remains high pressure in refrigerant when the A/C compressor assembly is operating. It is necessary to
ensure that each connecting part in A/C system is sealed well. Check all the system lines at least once a year
to ensure that they are in good condition and properly routed. The refrigerant lines and hoses cannot be
repaired and must be replaced if leakage or damage exists.

1. General inspection

a. Check if there exists any oil or dust in each joint of the A/C line. If this occurs, there may exist leak.
b. Check if the surface of condenser is dirty and the fins are deformed.
c. Check for harsh noises while the compressor assembly is operating normally.
d. Temperature difference should be noticeable by feeling the intake line and exhaust line of compressor

assembly with hand. Normally, the intake line is cool while the exhaust line is hot. Feel the temperature
of intake duct and exhaust duct of condenser with hand. Normally, the temperature of intake duct is
higher than that of exhaust duct. Feel the temperature difference between expansion valve inlet and
outlet line with hand. Normally, the expansion valve inlet line is hot while the outlet line is cool, and
temperature difference is noticeable between both.

2. Using the pressure gauge set, check the refrigerant pressure.

a. Connect the manifold pressure gauge set. After the following conditions are met, read the pressure on

pressure gauge. Measurement conditions are as follows:
 Inner/outer circulation switch is in outer circulation position.
 Engine runs at approximately 2000 rpm.
 Adjust the temperature knob to MAX. COOL.
 Blower speed control switch is in highest band.
 Turn on the A/C switch.

Observe the pressure value on the pressure gauge. In normal condition, the pressure of low pressure side
is 0.15 - 0.20 MPa and the pressure of high pressure side is 1.3 -1.7 MPa.

Compressor Assembly Noise Inspection

When checking noise related to A/C system, you must first know the conditions under which the noise occurs.
These conditions include: weather, vehicle speed, engine speed, engine temperature and any other special
conditions. Louder noises during A/C operation can often mislead someone. For example, what sounds like a
failed bearing, may be caused by loose bolts, mounting brackets or a loose compressor assembly.

1. Select a quiet place for testing.
2. Duplicate the customer's feedback information as much as possible.
3. Turn the A/C system on and off several times to clearly identify the compressor assembly noise.

CAUTION

 A/C compressor assembly must be replaced if any abnormal compressor assembly noise is heard.
 Noise may occur from the drive belt at different engine speeds, and you may mistake it for a noise from

A/C compressor assembly. The noise occurs when the compressor assembly operates at the maximum
displacement, and it will not occur at the minimum displacement.