1413 12 1110

5

1

2

3

4

6

7

8

9

J

L

K

I

G

D

C

B

E

F

A

86

86

30

87

85

86

86

87

87

87

30

30

30

85

85

85

2

2

3

3

5

5

1

1

1

2

5 3

1

2

5 3

86

87

30

1

1

2

5
3

2

5
3

85

EF01

EF21

EF18

EF25

EF20

EF29

EF06

EF02

EF30

EF17

EF19

EF23

EF22

EF26

EF24

EF08

EF27

EF28

EF05

EF07

EF16

EF04

EF03

EF15

EF12

EF10

EF1

1

EF09

EF13

EF14

EF32

EF31

B

86

87

30

85

FE02-7810b

(a)

Turn the ignition switch to "OFF" position.

(b)

Remove the low-speed cooling fan relay B.

(c)

Turn the ignition switch to "ON" position.

(d)

Measure voltage between relay B terminal No.85 and a
reliable ground.

Standard Voltage: 11-14 V

Is the voltage specified value?

No

Circuit between relay terminal No.85 and the
main relay terminal No.3 is open.

Yes

Step 9

Check low-speed relay B control circuit.

1

3

5

7

8

6

4

2

9

10

11

12

13

23

24

25

26

27

28

29

30

37

51

52

53

54

55

56

57

58

59

60

61

62

63

64

38

39

40

41

42

43

44

45

46

47

48

49

50

31

32

33

34

35

36

14

15

16

17

18

19

20

21

22

ECM Harness Connector EN01

1413 12 1110

5

1

2

3

4

6

7

8

9

J

L

K

I

G

D

C

B

E

F

A

86

86

30

87

85

86

86

87

87

87

30

30

30

85

85

85

2

2

3

3

5

5

1

1

1

2

5 3

1

2

5 3

86

87

30

1

1

2

5
3

2

5
3

85

EF01

EF21

EF18

EF25

EF20

EF29

EF06

EF02

EF30

EF17

EF19

EF23

EF22

EF26

EF24

EF08

EF27

EF28

EF05

EF07

EF16

EF04

EF03

EF15

EF12

EF10

EF1

1

EF09

EF13

EF14

EF32

EF31

B

86

87

30

85

FE02-7811b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect ECM harness connector EN01.

(c)

Remove the low-speed cooling fan relay B.

(d)

Test the continuity between the cooling fan low speed relay
B terminal No.86 and EN01 terminal No.62.

(e)

Measure voltage between high-speed cooling fan relay B
terminal No.86 and a reliable ground. Check whether there
is a circuit short to power supply.

Standard Value:

Test Items

Specified Value

Relay B (86)-EN01 (62)

Less than 1 Ω

Relay B (86) - Reliable Ground

0 V

Is the measured value specified values?

No

Circuit between relay B terminal No.86 and
EN01 terminal No.62 is open.

Yes

Step 10

Check ECM circuit.

(a)

Check whether ECM power supply circuit is normal.

(b)

Check whether ECM ground circuit is normal.

No

Repair the faulty part.

Engine

Cooling System JL4G18-D

2-471

Yes

Step 11

Replace ECM.

Next

Step 12

Diagnostic completed.

2.8.7.5 Cooling Fan Always Runs At Low Speed

Note

When the cooling fan always runs at low speed, it is recommended to carry out diagnostic when the engine is completely
cooled down.

Step 1

Verify the fault.

Next

Step 2

Check the engine coolant temperature sensor signal.

(a)

Turn the ignition switch to "OFF" position.

(b)

Connect scan tool to the datalink connector.

(c)

Turn off the A/C switch.

(d)

Turn the ignition switch to "ON" position.

(e)

Select in sequence: Engine / Data List / Engine Coolant
Temperature.

(f)

Observe the temperature measured by the engine coolant
temperature sensor. When the engine is completely cooled
down, this temperature should be slightly higher than the
ambient temperature.

Confirm whether the measured temperature is normal.

No

Temperature sensor or circuit is faulty. Refer
to the

2.2.7.19

 

DTC P0117 P0118

Yes

Step 3

Remove and check the cooling fan low speed relay. Does the cooling fan still run?

No

Go to step 5

Yes

Step 4

Check and repair the circuit between low-speed cooling fan relay and cooling fan wiring harness connector
CA16.

2-472

Cooling System JL4G18-D

Engine

1413 12 1110

5

1

2

3

4

6

7

8

9

J

L

K

I

G

D

C

B

E

F

A

86

86

30

87

85

86

86

87

87

87

30

30

30

85

85

85

2

2

3

3

5

5

1

1

1

2

5 3

1

2

5 3

86

87

30

1

1

2

5
3

2

5
3

85

EF01

EF21

EF18

EF25

EF20

EF29

EF06

EF02

EF30

EF17

EF19

EF23

EF22

EF26

EF24

EF08

EF27

EF28

EF05

EF07

EF16

EF04

EF03

EF15

EF12

EF10

EF1

1

EF09

EF13

EF14

EF32

EF31

1

2

3

B

86

87

30

85

Cooling Fan Harness Connector CA16

FE02-7809b

(a)

Turn the ignition switch to "OFF" position.

(b)

Remove of low-speed cooling fan relay.

(c)

Disconnect cooling fan wiring harness connector CA16.

(d)

Check and repair circuit between relay and connector short
to power supply.

Step 5

Check cooling fan low speed relay.

(a)

Measure resistance between relay terminal No.87 and
terminal No.30.

Standard Resistance: 10 kΩ or higher

Is the resistance specified value?

No

Replace the relay.

Yes

Step 6

Check low-speed relay B control circuit.

Engine

Cooling System JL4G18-D

2-473

1

3

5

7

8

6

4

2

9

10

11

12

13

23

24

25

26

27

28

29

30

37

51

52

53

54

55

56

57

58

59

60

61

62

63

64

38

39

40

41

42

43

44

45

46

47

48

49

50

31

32

33

34

35

36

14

15

16

17

18

19

20

21

22

ECM Harness Connector EN01

1413 12 1110

5

1

2

3

4

6

7

8

9

J

L

K

I

G

D

C

B

E

F

A

86

86

30

87

85

86

86

87

87

87

30

30

30

85

85

85

2

2

3

3

5

5

1

1

1

2

5 3

1

2

5 3

86

87

30

1

1

2

5
3

2

5
3

85

EF01

EF21

EF18

EF25

EF20

EF29

EF06

EF02

EF30

EF17

EF19

EF23

EF22

EF26

EF24

EF08

EF27

EF28

EF05

EF07

EF16

EF04

EF03

EF15

EF12

EF10

EF1

1

EF09

EF13

EF14

EF32

EF31

B

86

87

30

85

FE02-7811b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect ECM harness connector EN01.

(c)

Remove low-speed cooling fan relay B.

(d)

Test the continuity between cooling fan low speed relay B
terminal No.86 and ECM harness connector EN01 terminal
No.62.

(e)

Measure resistance between cooling fan low speed relay B
terminal No.86 and a reliable ground. check whether there is
a short to ground circuit.

Standard Value:

Test Items

Specified Value

Relay B (86)-EN01 (62)

Less than 1 Ω

Relay B (86) - Reliable Ground

10 kΩ or higher

Is the measured value specified Value?

No

Circuit between relay B terminal No.86 and
EN01 terminal No.62 is faulty.

Yes

Step 7

Check ECM circuit.

(a)

Check whether ECM power supply circuit is normal.

(b)

Check whether ECM ground circuit is normal.

No

Repair the faulty part.

Yes

Step 8

Replace ECM.

Next

Step 9

Diagnostic completed.

2.8.7.6 Cooling Fan Always Runs At High Speed

Note

When  the  cooling  fan  always  runs  at  high  speed,  it  is  recommended  to  carry  out  diagnostic  when  the  engine  is
completely cooled down.

Step 1

Verify the fault.

Next

Step 2

Check the engine coolant temperature sensor signal.

2-474

Cooling System JL4G18-D

Engine