Chery Tiggo 5 (T21). Service manual - part 77

06–

150

06

DTC

P0645-00 A/C Clutch Relay Circuit

DTC

P0646-00 A/C Clutch Relay Control Circuit Low

DTC

P0647-00 A/C Clutch Relay Control Circuit High

06–

151

06

ET21065017

BATTERY

ECM
MAIN 
RELAY

10A

EF19

10A

EF17

10A

EF40

A2

F14

2-20

RL

A4

2-35

L

2-5

Br

A6

2-15

2-16

RR

R

86

87

85

30

ENGINE 
COMPARTMENT 
FUSE AND 
RELAY BOX

IGNITION SWITCH
    ON OR START

A1

A2

A3

A4

A5

A6

A7

A8 A9 A10

F12

F24

F11

F23

F10

F22

F9

F21

F8

F20

F7

F19

F6

F18

F5

F17

F4

F16

F3

F15

F2

F14

F1

F13

Gr

E-076

W

E-069

E-076

E-069

B

E-033

49 50 51

63

64

15

16

31

32

47

48

33 34 35

17 18 19

1

2

3

52 53 54 55 56 57 58 59 60 61 62

36 37 38 39 40 41 42 43 44 45 46

20 21 22 23 24 25 26 27 28 29 30

4

5

6

7

8

9 10 11 12 13 14

ECM-2

E-033

37 38 39 40 41 42 43 44 45 46

47

48

25 26 27 28 29 30 31 32 33 34

35

36

13 14 15 16 17 18 19 20 21 22

23

24

1

2

3

4

5

6

7

8

9 10

11

12

B

E-035

ECM-1

E-035

1-47

Br

Br

1-48

E-028

2-63

B

B

2-64

E-026

2

5

1

3

E-023

F1

C1

A/C 
COMPRE-
SSOR
CLUTCH 
RELAY

EF10

10A

A/C
COMPRESSOR

BR

2

1

E-002

E-019

LG

MT

CVT

2-42

2-58

2

1

C1

C2

C3 C4

C5

C6

C7

C8 C9 C10

L

E-023

B

E-002

06–

152

06

DTC Confirmation Procedure

Confirm that battery voltage is over 12 V before performing the following procedures.
 Turn ignition switch to LOCK.
 Connect X-431 3G diagnostic tester (the latest software) to Data Link Connector (DLC).
 Turn ignition switch to ON.
 Use X-431 3G diagnostic tester to record and clear the DTCs stored in the ECM.
 Start the engine and warm it up to normal operating temperature, and then select Read Code.
 If the DTC is detected, the malfunction indicated by the DTC is current. Go to the diagnosis procedure - Step 1.
 If DTC is not detected, the malfunction indicated by the DTC is intermittent (

See page 06-18

).

Diagnosis Procedure

a. Turn ignition switch to LOCK.
b. Check ECM grounds E-026 and E-028 (

See page 06-18

).

DTC Code

DTC Definition

DTC Detection 

Condition

Possible Cause

P0645-00

A/C Clutch Relay 
Circuit

Ignition switch ON
Engine running

 A/C compressor relay
 Wire harness or connector
 ECM

P0646-00

A/C Clutch Relay 
Control Circuit Low

P0647-00

A/C Clutch Relay 
Control Circuit High

CAUTION

 When performing circuit diagnosis and test, always refer to the circuit diagram for specific circuit and 

component information.

1

Check ECM ground point

Repair or replace ground wire harness or 
ground point

NG

OK

06–

153

06

a. Unplug A/C compressor relay from engine compartment 

fuse and relay box.

b. Check A/C compressor relay terminals.

a. Disconnect engine compartment fuse and relay box 

connector E-069.

b. Disconnect ECM connector E-033.
c. Check wire harness between ECM connector terminals 

and engine compartment fuse and relay box connector 
terminals.
Check for Open

2

Check A/C compressor relay

-

+

2

1

5

3

1

2

3

5

RT21060270

Multimeter 

Connection

Specified Condition

3 - 5

No continuity

3 - 5

Continuity

(when battery voltage is applied 

between terminals 1 and 2)

Replace A/C compressor relay

NG

3

Check A/C compressor relay control circuit

OK

E-033

E-069

F12

F24

F11

F23

F10

F22

F9

F21

F8

F20

F7

F19

F6

F18

F5

F17

F4

F16

F3

F15

F2

F14

F1

F13

49 50 51

63

64

15

16

31

32

47

48

33 34 35

17 18 19

1 2 3

52 53 54 55 56 57 58 59 60 61 62

36 37 38 39 40 41 42 43 44 45 46

20 21 22 23 24 25 26 27 28 29 30

4 5 6 7 8 9 10 11 12 13 14

-

+

RT21065057

Multimeter 

Connection

Condition

Specified 

Condition

E-033 (42) (MT) 

or E-033 (58) 

(CVT) - E-069 

(F1)

Always

Continuity