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 A/C switch.

(d)

Turn the ignition switch to "ON" position.

(e)

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

(f)

Observe the engine coolant temperature sensor displayed
temperature, when the engine is completely cooled down, the
displayed temperature should be slightly higher than the
ambient temperature.

Is displayed temperature normal?

No

Coolant temperature sensor or circuit
malfunction. Refer to the

2.12.7.20

 

DTC

P0117 P0118

Yes

Step 3

Remove and check the cooling fan low-speed relay, cooling fan still running?

No

Go to step 5

Yes

Step 4

Check and repair circuit between high speed cooling fan relay and cooling fan wiring harness connector
CA16.

Engine

Engine Cooling System JL4G15-D

2-851

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

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 cooling fan wiring harness connector CA16.

(d)

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

Step 5

Check cooling fan high-speed relay.

(a)

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

Standard Resistance: 10 kΩ or higher

Is the resistance specified value?

No

Replace relay.

Yes

Step 6

Check high-speed relay a control circuit.

2-852

Engine Cooling System JL4G15-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

EF14

EF24

EF28

EF27

EF26

EF18

EF07

EF06

EF30

EF19

EF20

EF21

EF22

EF23

EF25

EF15

EF16

EF17

EF13

EF12

EF1

1

EF10

EF09

EF08

EF05

EF04

EF03

EF02

EF01

A

86

87

30

85

1

17

33

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ECM Harness Connector EO35

FE02-7902b

(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 continuity between cooling fan high speed relay A
terminal No.86 and ECM harness connector EO35 terminal
No.66.

(e)

Measure resistance between cooling fan high speed relay A
terminal No.86 and a reliable ground. Check whether the
circuit is short to ground.

Standard Value:

Test Items

Specified Value

Resistance Between Relay A (86) and
EO35 (66)

Less than 1 Ω

Resistance Between Relay A (86) and
A Reliable Ground

10 kΩ or higher

Are measured values specified values?

No

Relay A terminal No.86 and EO35 terminal
No.66 wiring harnesses are faulty.

Yes

Step 7

Check ECM working 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.

(a)

Carry out crankshaft self learn after ECM replacement. Refer
to 

2.12.7.11

 

Crankshaft Position Sensor (CKP) Learn

.

Next

Step 9

Diagnostic completed.

Engine

Engine Cooling System JL4G15-D

2-853

2.19 Lubrication System JL4G15-D

2.19.1  4G15-D  Engine  Lubrication  System
Overview

Compared  with  4G18-D,  4G15-D  engine  lubrication  system
has  the  same  content  in  Specification,  Description  and
Operation, the System Working Principle, Component Locator,
Schematic, Removal and Installation. For specific information,
please  refer  to

2.3

 

Fuel  System  JL4G18-D

.  This  chapter

described  contents  are  different  from  4G18-D.  For  relevant
information. Refer to the following content.

2-854

Lubrication System JL4G15-D

Engine