4. Diagnostic Steps:

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.

Step 1

Initial Inspection

(a)

Check whether there is KS sensor physical damage.

(b)

Check whether KS sensor is installed correctly. Torque is set
too tight or too loose will trigger DTC codes.

(c)

Check KS sensor installation surface whether there are
glitches, casting flash and foreign matter.

(d)

Knock sensor must be kept away from hoses, brackets and
engine wires.

Are above mentioned parts normal?

No

Repair the faulty part. Go to step 9

Yes

Step 2

Read the engine data (engine speed) on the scan tool.

(a)

Connect scan tool to datalink connector.

(b)

Turn the ignition switch to "ON" position.

(c)

Select "Engine"/"Read Data"/"Knock Sensor Signal 1".

(d)

Start and run the engine at normal working temperature.

(e)

Road test the vehicle and read the engine speed data on the
scan tool.

Is data normal?

Standard Value: Normal data. Refer to 

2.2.7.9

 

Data Stream List

No

Go to step 4

Yes

Step 3

Intermittent Fault. Refer to 

2.2.7.4

 

Fault Symptom Table

.

Step 4

Check the knock sensor.

Engine

Control System JL4G18-D

2-159

Knock Sensor

FE02-5083b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect Knock Sensor harness connector EN08.

(c)

Measure knock sensor resistance.

Standard Resistance: 49 kΩ at 20°C (68 ºF)

(d)

Connect Knock Sensor harness connector EN08.

Is resistance normal?

No

Replace the knock sensor. Refer to

2.10.8.5

 

Knock Sensor Replacement

. Go to

step 9

Yes

Step 5

Check sensor terminal No.1 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

Knock Sensor Harness Connector EN08

1

2

FE02-5084b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect Knock Sensor harness connector EN08.

(c)

Disconnect ECM harness connector EN01.

(d)

Measure resistance between knock sensor harness
connector EN08 terminal No.1 and ECM harness connector
EN01 terminal No.30. Check whether the circuit is open.

(e)

Measure resistance between knock sensor harness
connector EN08 terminal No.1 and a reliable ground. Check
whether the circuit is short to ground.

(f)

Measure voltage between knock sensor harness connector
EN08 terminal No.1 and power supply. Check whether the
circuit is short to power supply.

Test Items

Standard Value

Resistance Between EN08 (1) and EN01 (30)

Less than 1 Ω

Resistance Between EN08 (1) and a Reliable
Ground

10 kΩ or higher

Voltage Between EN08 (1) and a Reliable
Ground

0 V

Are the values specified values?

No

Repair the faulty part. Go to step 9

Yes

Step 6

Check sensor terminal No.2 circuit.

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Control System JL4G18-D

Engine

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

Knock Sensor Harness Connector EN08

1

2

FE02-5085b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect Knock sensor harness connector EN08.

(c)

Disconnect ECM harness connector EN01.

(d)

Measure resistance between knock sensor harness
connector EN08 terminal No.2 and ECM harness connector
EN01 terminal No.31. Check whether the circuit is open.

(e)

Measure resistance between knock sensor harness
connector EN08 terminal No.2 and a reliable ground. Check
whether the circuit is short to ground.

(f)

Measure voltage between knock sensor harness connector
EN08 terminal No.2 and power supply. Check whether the
circuit is short to power supply.

Test Items

Standard Value

Resistance Between EN08 (2) and EN01 (31)

Less than 1 Ω

Resistance Between EN08 (2) and a Reliable
Ground

10 kΩ or higher

Voltage Between EN08 (2) and a Reliable
Ground

0 V

Are the values specified values?

No

Repair the faulty part. Go to step 9

Yes

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.

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)

Road test the vehicle for at least 10 min.

(f)

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

No

Intermittent Fault. Refer to 

2.2.7.3

 

Intermittent

Fault Check

Engine

Control System JL4G18-D

2-161

Yes

Step 10

Diagnostic completed.

5. Repair Instructions:

Replaced the knock sensor. Refer to 

2.10.8.5

 

Knock Sensor Replacement

.

2.2.7.31 DTC P0340-P0343

1. DTC Descriptor:

DTC

P0340

Camshaft Position Sensor Incorrectly Installed

DTC

P0341

Camshaft Position Sensor Poor Connection

DTC

P0342

Camshaft Position Sensor Circuit Short to Ground

DTC

P0343

Camshaft Position Sensor Circuit Short to Power Supply

CMP links the crankshaft position to the camshaft position, so that ECM calculates cylinder No.1 compression TDC and determines
at what time to which cylinder spray fuel.

Camshaft position sensor circuit includes the following:

–

Reference Voltage: ECM provides a reference voltage to CMP sensor harness connector EN15 terminal No.1 via ECM harness
connector EN01 terminal No.39.

–

Signal Circuit: ECM receives signal voltage from CMP sensor harness connector EN15 terminal No.2 via ECM harness connector
EN01 terminal No.42.

ECM Low Reference Voltage Circuit: ECM provides a low reference voltage to CMP sensor harness connector EN15 terminal No.
3 via ECM harness connector EN01 terminal No.14 and 18.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection Strategy

Conditions For Setting The DTC

(Control Strategy)

Fault Locations

P0340

Poor Connection

1. Phase signal register value is

equal to 255, or equal to 0.

2. Phase signal transition count is

greater than 4.

1. Sensor Circuit

2. Sensor

3. ECM

P0341

Poor Connection

Phase signal register value is greater
than 0 and less than 255 at the same
time does not equal 170 and 85.

P0342

Short to Ground

Phase signal register value is equal to
0.

P0343

Short to Power Supply

Phase signal register value is equal to
255.

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Engine