Geely EC718, EC718RV, EC715, EC715RV. Manual part — 187

3. Schematic:

Engine Coolant Temperature Sensor

Engine

Control

Module

FE02-5208b

4. Diagnostic Steps:

Warning!

Refer to "Cooling System Service Warning" in "Warnings and Notices".

Note

Before carrying out this diagnosis step, observe the data list on scan tool and analyze the accuracy of the data, as
these will help with quick diagnosis.

Note

At any time do not use flammable antifreeze, such as alcohol. Combustible antifreeze can cause serious fires.

Step 1

Initial Inspection

(a)

Check the engine coolant temperature sensor whether there
is evidence of corrosion, as well as the engine coolant is
leaking through the sensor.

(b)

Check whether the engine coolant level is correct.

Next

Step 2

Measure engine coolant temperature sensor resistance.

(a)

Turn the ignition switch to "OFF" position.

Engine

Control System JL4G15-D

2-663

(b)

Disconnect the engine coolant temperature sensor wiring
harness connector EO23.

(c)

Measure engine coolant temperature sensor resistance.

Standard Resistance: (Refer to the specific
parameters

2.2.1.2

Temperature Sensor Temperature and

Resistance Correlation

): 2,400 Ω/20°C (68 ºF)

(d)

Connect the engine coolant temperature sensor wiring
harness connector EO23.

Is the resistance specified value?

No

Replace the engine coolant temperature
sensor. Go to step 9

Yes

Step 3

Measure engine coolant temperature sensor signal circuit.

FE02-5344b

1 2 3

Engine Coolant Temperature Sensor Harness
Connector EO23

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect the engine coolant temperature sensor wiring
harness connector EO23.

(c)

Turn the ignition switch to "ON" position.

(d)

Measure voltage between engine coolant temperature
sensor EO23 terminal No.1 and a reliable ground.

Standard Voltage: 4.7-5 .5 V

(e)

Connect the engine coolant temperature sensor wiring
harness connector EO23.

Voltage normal?

No

Go to step 5

Yes

Step 4

Measure engine coolant temperature sensor ground circuit.

FE02-5345b

1 2 3

Engine Coolant Temperature Sensor Harness
Connector EO23

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect the engine coolant temperature sensor wiring
harness connector EO23.

(c)

Turn the ignition switch to "ON" position.

(d)

Measure resistance between engine coolant temperature
sensor wiring harness connector EO23 terminal No.3 and A
reliable ground.

Standard Resistance: Less than 3 Ω

(e)

Connect the engine coolant temperature sensor wiring
harness connector EO23.

Resistance normal?

No

Go to step 6

Yes

Go to step 7

2-664

Control System JL4G15-D

Engine

Step 5

check the engine coolant temperature sensor signal circuit.

FE02-5346b

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

1 2 3

ECM Harness Connector EO01

Engine Coolant Temperature Sensor Harness
Connector EO23

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect the engine coolant temperature sensor wiring
harness connector EO23.

(c)

Disconnect ECM harness connector EO01.

(d)

Measure resistance between engine coolant temperature
sensor wiring harness connector EO23 terminal No.1 and
ECM harness connector terminal No.24. Check whether the
circuit is open.

(e)

Measure resistance between engine coolant temperature
sensor wiring harness connector EO23 terminal No.1 and a
reliable ground. Check whether the circuit is short to ground.

(f)

Measure voltage between engine coolant temperature
sensor wiring harness connector EO23 terminal No.1 and a
reliable ground. Check whether the circuit is short to power
supply.

Test Items

Standard Value

Resistance Between EO23 (1) and EO01
(24)

Less than 1 Ω

Resistance Between EO23 (1) and A
Reliable Ground

10 kΩ or higher

Voltage Between EO23 (1) and A Reliable
Ground

0 V

Next

Go to step 7

Step 6

Check the engine coolant temperature sensor ground circuit.

Engine

Control System JL4G15-D

2-665

FE02-5347b

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

1 2 3

ECM Harness Connector EO01

Engine Coolant Temperature Sensor Harness
Connector EO23

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect the engine coolant temperature sensor wiring
harness connector EO23.

(c)

Disconnect ECM harness connector EO01.

(d)

Measure resistance between engine coolant temperature
sensor wiring harness connector EO23 terminal No.3 and
ECM harness connector terminal No.29. Check whether the
circuit is open. Otherwise, repair the faulty part.

(e)

Measure voltage between engine coolant temperature
sensor wiring harness connector EO23 terminal No.3 and a
reliable ground. Check whether the circuit is short to power
supply. Otherwise, repair the faulty part.

Test Items

Standard Value

Resistance Between EO23 (3) and EO01
(29)

Less than 1 Ω

Voltage Between EO23 (3) and A Reliable
Ground

0 V

Execute next step as per normal.

Next

Step 7

Check ECM power supply 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)

Replace ECM. Refer to

2.2.8.8

Engine Control Module

Replacement

.

(b)

Carry out crankshaft position sensor self learn. Refer to

2.12.7.11

Crankshaft Position Sensor (CKP) Learn

.

Next

Step 9

Use scan tool to confirm whether the DTC code is stored again.

(a)

Connect scan tool to the datalink connector.

(b)

Turn the ignition switch to "ON" position.

(c)

Clear DTC code.

(d)

Start and run the engine at idle speed to warm up the engine
for at least 5 min.

(e)

Read control system DTC code again to confirm that the
system has no DTC code.

2-666

Control System JL4G15-D

Engine