Chery Tiggo 5 (T21). Service manual — part 333
31–
36
31
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 system 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)
RT21311110
-
+
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 (38) - Body
ground
Always
No continuity
K-012 (22) - 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
31–
37
31
AIR CONDITIONING
DTC
B2127
AC Evaporator Temperature Sensor Short to Ground or
Open
ET21310110
HVAC
CONTROL
PANEL
K-012
BATTERY
RF10
7.5A
RF21
10A
IGNITION SWITCH
ON OR START
10
21
1
2
3
4
5
6
7
8
9 10 11 12
13
85
85
87
87 30
87 30
30
86
86
85
86
14 15 16 17 18 19 20 21 22 23 24
25
27
26
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
W
K-012
22 21 20
18
19
17 16 15
13
14
12 11 10
8
9
7
6
5
3
4
2
1
B
I-039
B
I-007
2
WB
BR
4
21
WV
19
Y
INSTRUMENT
PANEL FUSE
AND RELAY
BOX
I-007
I-039
K-007
4
B
BrW
8
I-039
K-007
I-037
W
K-007
1
2
3
4
5
6
8
9
10 11
13 14
15 16
18
17
21
20
22
7
12
19
LW
29
22
2
1
O
EVAPORATOR
TEMPERATURE
SENSOR
K-005
2
1
W
K-005
31–
38
31
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 and evaporator temperature sensor
connector K-005.
d. Check if wire harnesses are worn, pierced, pinched or partially broken.
e. Look for broken, bent, protruded or corroded terminals.
f. Check if related connector pins are in good condition.
a. Remove the evaporator temperature sensor.
b. Install the new evaporator temperature sensor 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
B2127
AC Evaporator
Temperature Sensor
Short to Ground or
Open
Ignition switch ON
Evaporator temperature sensor
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 evaporator temperature sensor
Replace evaporator temperature sensor
NG
OK
NO
YES
31–
39
31
a. Turn ignition switch to LOCK.
b. Disconnect the negative battery cable.
c. Disconnect the HVAC control panel assembly connector
K-012 and evaporator temperature sensor connector
K-005.
d. Using a digital multimeter, check for continuity between
terminals of connector K-012 and connector K-005 to
check if there is an open in system according to the table
below.
Standard Condition
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 system is
short to ground according to the table below.
Standard Condition
3
Check wire harness and connector (HVAC control panel assembly - evaporator temperature
sensor)
RT21311120
-
+
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-005
2
1
Multimeter
Connection
Condition
Specified
Condition
K-012 (22) -
K-005 (2)
Always
Continuity
K-012 (29) -
K-005 (1)
Always
Continuity
Repair or replace A/C wire harness and
connector
NG
4
Check wire harness and connector (HVAC control panel assembly - body ground)
OK
RT21311130
-
+
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 (22) - Body
ground
Always
No continuity
K-012 (29) - Body
ground
Always
No continuity
Repair or replace A/C wire harness and
connector
NG
OK
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