Geely EC718, EC718RV, EC715, EC715RV. Manual part — 205

Step 7

Check sensor signal circuit.

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

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44

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46

47

48

49

50

51

52

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19

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25

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28

29

30

31

32

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

A

B

C

FE02-5315b

Camshaft Position Sensor Harness
Connector EO15

ECM Harness Connector EO01

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect camshaft position sensor wiring harness
connector EO15.

(c)

Disconnect ECM harness connector EO01.

(d)

Measure resistance between camshaft position sensor
harness connector EN015 terminal A and ECM harness
connector EN01 terminal No.56. Check whether the circuit is
open.

(e)

Measure resistance between camshaft position sensor
harness connector EN015 terminal A and a reliable ground.
Check whether the circuit is short to ground.

(f)

Measure resistance between camshaft position sensor
harness connector EN015 terminal A and power supply.
Check whether the circuit is short to power supply.

Test Items

Standard Value

Resistance Between EN15 (A) and EN01
(56)

Less than 1 Ω

Resistance Between EN15 (A) and A
Reliable Ground

10 kΩ or higher

Voltage Between EN15 (A) and A Reliable
Ground

0 V

Are the values specified values?

No

Repair the faulty part. Go to step 12

Yes

Step 8

Check ECM internal low reference circuit.

Engine

Control System JL4G15-D

2-735

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

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42

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48

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50

51

52

18

19

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28

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30

31

32

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

A

B

C

FE02-5316b

Camshaft Position Sensor Harness
Connector EO15

ECM Harness Connector EO01

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect camshaft position sensor wiring harness
connector EO15.

(c)

Disconnect ECM harness connector EO01.

(d)

Measure resistance between camshaft position sensor wiring
harness connector EN15 terminal B and ECM harness
connector EN01 terminal No.18. Check whether the circuit is
open.

(e)

Measure voltage between camshaft position sensor wiring
harness connector EN15 terminal B and a reliable ground.
Check whether the circuit is short to power supply.

Test Items

Standard Value

Resistance Between EN15 (B) and EN01 (18)

Less than 1 Ω

Voltage Between EN15 (B) and A Reliable
Ground

0 V

Execute next step as per normal.

Next

Step 9

Check whether camshaft signal plate is normal.

No

Repair the faulty part. Go to step 12

Yes

Step 10

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 11

Replace ECM.

Next

Step 12

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.

2-736

Control System JL4G15-D

Engine

No

Intermittent Fault. Refer to

2.2.7.3

Intermittent

Fault Check

Yes

Step 13

Diagnostic completed.

5. Repair Instructions:

Replace CMP sensor. Refer to

2.10.8.1

Camshaft Position Sensor Replacement

.

2.12.7.37 DTC P0351 P0352

1. DTC Descriptor:

DTC

P0351

Ignition Coil 1 Malfunction

DTC

P0352

Ignition Coil 2 Malfunction

Ignition coil 1 provides ignition for cylinders No.1 and 4. Ignition coil 2 provides ignition for cylinders No.2 and 3. Ignition relay provides
power time to the two ignition coils at the same time. ECM controls cylinders No.1 and 4 primary ground circuit through ECM harness
connector EO01 terminal No.1. ECM controls cylinders No.2 and 3 primary ground circuit through ECM harness connector EO01
terminal No.17.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection Strategy

Conditions For Setting The DTC

(Control Strategy)

Fault Locations

P0351

Hardware Circuit Checks

Operating at idle, with the ignition coil
control end disconnected, short to
ground and short to power supply,
this DTC code will be set. The fuel
injection to the cylinder with this DTC
code stops. Engine speed fluctuates.

1. Ignition Coil Circuit

2. Ignition Coil

3. ECM

P0352

Engine

Control System JL4G15-D

2-737

3. Schematic:

MAIN

87

86

30

85

B

A

C

EF22

EF01

EO01

EO01

1

17

COILA

COILB

Main Relay

From Battery

Engine

Control

Module

Ignition Coil A

Ignition Coil B

Ignition Switch

FE02-5281b

4. Diagnostic Steps:

Check ignition coil. Refer to

2.20

Ignition System JL4G15-D

in

2.20.4

Diagnostic Information and Procedures

.

5. Repair Instructions:

Replace the ignition coil. Refer to

2.10.8.3

Ignition Coil Replacement

.

2.12.7.38 DTC P0420

1. DTC Descriptor:

DTC

P0420

Three-Way Catalytic Converter Conversion Efficiency Low

ECM uses two oxygen sensors (Pre-Catalytic oxygen sensor and Post-Catalytic oxygen sensor) installed before and after the three-
way catalytic converters to monitor the conversion efficiency of the three-way catalytic converter (TWC). ECM uses Pre-Catalytic
oxygen sensor for Air-Fuel ratio close-loop control and monitors oxygen content in the exhaust gas not purified by TWC. The Post-
Catalytic oxygen sensor sends voltage signal to ECM indicating the oxygen content in the exhaust gas purified by the TWC. ECM
compares signals from the two sensors to determine whether the TWC is currently under normal working condition. If the calculated
TWC conversion efficiency is too low, the fault lamp will be lit and the DTC code will be set.

2-738

Control System JL4G15-D

Engine