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5

1

2

3

4

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7

8

9

J

L

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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

A

86

87

30

85

1

2

3

Cooling Fan Harness Connector CA16

FE02-7804b

(a)

Turn the ignition switch to "OFF" position.

(b)

Remove the high-speed cooling fan relay.

(c)

Disconnect the cooling fan wiring harness connector CA16.

(d)

Test the continuity between the high-speed cooling fan relay
A terminal No.30 and the cooling fan wiring harness
connector CA16 terminal No.2.

(e)

Measure resistance between the high-speed cooling fan
relay A terminal No.30 and a reliable ground. check whether
there is a short to ground circuit.

Standard Value:

Test Items

Specified Value

Relay A (30)-CA16 (2)

Less than 1 Ω

Resistance Between Relay A (30) and
A Reliable Ground

10 kΩ or higher

Is the measured value specified value?

No

Circuit between the relay terminal No.30 and
the cooling fan wiring harness connector
CA16 terminal No.2 is fault. check and Repair
the faulty part.

Yes

Step 7

Replace the high-speed cooling fan relay A. Confirm the fault has been fixed.

Step 8

Check high-speed relay A coil power supply.

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

A

86

87

30

85

FE02-7805b

(a)

Turn the ignition switch to "OFF" position.

(b)

Remove the high-speed cooling fan relay A.

(c)

Turn the ignition switch to "ON" position.

(d)

Measure voltage between high-speed cooling fan relay 85
terminal A and a reliable ground.

Standard Voltage: 11-14 V

Is the voltage specified value?

No

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

Yes

Step 9

Check the high-speed relay A control circuit.

Engine

Cooling System JL4G18-D

2-467

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

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47

48

49

50

31

32

33

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36

14

15

16

17

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21

22

ECM Harness Connector EN01

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B

E

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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

A

86

87

30

85

FE02-7806b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect ECM harness connector EN01.

(c)

Remove the high-speed cooling fan relay A.

(d)

Test the continuity between the high-speed cooling fan relay
86 terminal A and EN01 terminal No.52.

(e)

Measure voltage between high-speed cooling fan relay 86
terminal A and a reliable ground. check whether the circuit is
short to power supply.

Standard Value:

Test Items

Specified Value

Relay A (86)-EN01 (52)

Less than 1 Ω

Relay A (86) - A Reliable Ground

0 V

Is the measured value specified value?

No

Circuit between Relay 86 terminal A and
EN01 terminal No.52 is open. check and
repair the relevant parts.

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.

Yes

Step 11

Replace ECM.

Next

Step 12

Diagnostic completed.

2.8.7.4 Low-Speed Cooling Fan Does Not Run

Note

Before carry out this diagnostic procedures, please Refer to the2.8.7.2

 

Cooling Fan Circuit Diagnosis, which will facilitate

the Diagnostic.

Step 1

Check the low-speed cooling fan power supply.

2-468

Cooling System JL4G18-D

Engine

1

2

3

Cooling Fan Harness Connector CA16

FE02-7807b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect cooling fan wiring harness connector CA16.

(c)

Turn the ignition switch to "ON" position.

(d)

Connect scan tool to the datalink connector.

(e)

Select in sequence: Engine / Action Test / Fan 1.

(f)

Make low-speed relay work.

(g)

Measure voltage between CA16 cooling fan wiring harness
connector terminal No.1 and a reliable ground.

Standard Voltage: 11-14 V

Is the voltage specified value?

No

Go to step 4

Yes

Step 2

Check the cooling fan ground circuit.

1

2

3

Cooling Fan Harness Connector CA16

FE02-7802b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect the cooling fan wiring harness connector CA16.

(c)

Measure resistance between cooling fan wiring harness
connector CA16 terminal No.3 and a reliable ground.

Standard Resistance: Less than 1 Ω

Is the resistance specified value?

No

CA16 terminal No.3 poor connection to
ground. Inspect and repair the faulty parts.

Yes

Step 3

Replace the cooling fan assembly.

Step 4

Use scan tool "Action Test" to drive fan 1. Does the low speed relay work?

No

Go to step 8

Yes

Step 5

Check relay B terminal No.87 power supply.

Engine

Cooling System JL4G18-D

2-469

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

FE02-7808b

(a)

Turn the ignition switch to "OFF" position.

(b)

Remove the low-speed cooling fan relay B.

(c)

Measure voltage between cooling fan relay B terminal No.87
and a reliable ground.

Standard Voltage: 11-14 V

Is the voltage specified value?

No

Relay B terminal No.87 power circuit is faulty.
Inspect and repair the faulty parts.

Yes

Step 6

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

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 low-speed cooling fan relay.

(c)

Disconnect cooling fan wiring harness connector CA16.

(d)

Test the continuity between the Low-Speed cooling fan relay
B terminal No.30 and cooling fan wiring harness connector
CA16 terminal No.1.

(e)

Measure resistance between cooling air speed relay B
terminal No.30 and a reliable ground. check whether there is
a short to ground circuit.

Standard Value:

Test Items

Specified Value

Relay B (30)-CA16 (1)

Less than 1 Ω

Resistance Between Relay B (30) and
A Reliable Ground

10 kΩ or higher

Is the voltage specified value?

No

Circuit between the relay terminal No.30 and
the cooling fan wiring harness connector
CA16 terminal No.1 is faulty. Check and
Repair the faulty part.

Yes

Step 7

Replace the cooling fan low speed relay B. Confirm whether the fault has been fixed.

Step 8

Check low-speed relay B coil power supply.

2-470

Cooling System JL4G18-D

Engine