Geely Emgrand X7. Manual part — 64

2.2.7.36 DTC P0340 P0341

1. DTC

description:

DTC P0340

VCP Camshaft Position Sensor Status Diagnosis

DTC P0341

VCP Target Wheel Diagnosis

Camshaft position (CMP) sensor is used to detect camshaft position, and is associated with the
crankshaft position. It sends signals to the engine control module (ECM) to determine the
upcoming fuel injection. Engine Control Module (ECM) also uses the camshaft position sensor
output to determine the camshaft to the crankshaft relative position to control the valve timing of
camshaft adjustment and conduct emergency operations.

Intake Camshaft position sensor circuit includes the following:

– Reference Voltage: ECM provides a reference voltage to CMP sensor harness connector

EM18 terminal C via ECM harness connector EM01 terminal No.70.

– Signal Circuit: ECM receives signal voltage from CMP sensor harness connector EM18

terminal A via ECM harness connector EM01 terminal No.77.

–

ECM Low Reference Voltage Circuit: ECM provides a low reference voltage to CMP sensor
harness connector EM18 terminal B via ECM harness connector EM01 terminal No.74.

2. Conditions For Setting DTC and The Fault Location:

DTC
Code

DTC Detection Strategy

Conditions For Setting The DTC
(Control Strategy)

Fault
Locations

P0340

ECM detects the engine
running but does not
receive the intake camshaft
position sensor signal

1. ECM detects the engine running.

2. ECM detects the crankshaft

position sensor signal.

3. The intake Camshaft position

sensor signal is lost.

P0341

ECM detects the engine
running, but receives a the
intake camshaft position
sensor signal and that does
not match calibration.

1. ECM detects the engine running.

2. ECM detects the crankshaft

position sensor signal.

3. ECM detected camshaft position

sensor signal does not match the
reference crankshaft position
sensor signal.

1. Sensor

Circuit

2. Sensor

3. the intake

Camshaft
Signal
Wheel

4. ECM

255

3. Circuit

sketch

发

动

机
控

制

模
块

凸轮轴
位置传感器

70

EM01 V5REF1

CAMIN

V5RTN1

C

77

EM01

A

74

EM01

B

NL02-0054c

4. Diagnostic

Steps:

Note: Before carrying out this diagnosis step, observe the data list on fault diagnosis tester and
analyze the accuracy of the data, as these will help with quick diagnosis.

Step 1

Initial Inspection

(a) Inspect the sensor wiring harness connector EM18 whether there is loose or poor connection

and so on.

(b) Inspect whether the sensor is installed correctly.

(c) Inspect whether the sensor gap is normal.

Are these components normal?

Step 2

Measure sensor 5 V reference voltage.

No

Repair the faulty part. Go to step 9

Yes

Camshaft position Sensor

Engi

ne

co

ntr

ol mo

dul

e

256

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the intake camshaft

position sensor wiring harness
connector EM18.

(c) Rotated ignition switch to ON

position .

(d) Measure voltage between the

intake camshaft position sensor
wiring harness connector EM18
terminal No.C and a reliable
ground.

凸轮轴位置传感器线束连接器 EM18

C

B

A

NL02-0055c

Standard Voltage: 4.5-5.5V

(e) Connect the intake camshaft position sensor wiring harness connector EM18.

Is the value specified value?

Step 3

Measure Sensor Signal Circuit

(a) Rotated ignition switch to OFF position .

(b) Disconnect the intake camshaft position sensor wiring harness connector EM18.

(c) Rotated ignition switch to ON position .

(d) Measure voltage between the intake camshaft position sensor wiring harness connector

EM18 terminal A and a reliable ground.

Standard Voltage: 4.5-5.5V

(e) Connect the intake camshaft position sensor wiring harness connector EM18.

Is the value specified value?

Step 4

Test sensor ECM internal low reference circuit.

(a) Rotated ignition switch to OFF position .

(b) Disconnect the intake camshaft position sensor wiring harness connector EM18.

(c) Rotated ignition switch to ON position .

(d) Measure resistance between the intake camshaft position sensor wiring harness connector
EM18 terminal B and reliable ground.

Standard Resistance: Less than 3 Ω

(e) Connect the intake camshaft position sensor wiring harness connector EM18.

No

Go to step 7

Yes

No

Go to step 6

Yes

Camshaft position Sensor harness

connectorEM18

257

Is the value specified value?

Step 5

Refer to 2.10.7.1 “Replacement of Camshaft Position Sensor” to replace the intake
camshaft position sensor.

Step 6

Inspect the sensor 5 V reference voltage circuit.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the intake camshaft

position sensor wiring harness
connector EM18.

(c)

Disconnect ECM harness
connector EM01.

(d) Measure resistance between

intake camshaft position sensor
wire harness connector EM18
terminal B and ECM wire
harness connector EM01 terminal
70. Inspect whether there is
short-circuit situation.

ECM线束连接器

EM01

1

2

4

5

3

81

63

44

25

6

62

43

24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9

8

7

26

42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27

45

46

61 60 59 58 57 56 55 54 53 52 51 50 49 48 47

64

65

66

80 79 78 77 76 75 74 73 72 71 70 69 68 67

NL02-0033c

(e) Measure resistance value between air intake camshaft position sensor harness connector

EM18 C terminal and reliable grounding, check if circuit exist short circuit condition .

(f) Measure voltage value of air intake camshaft position sensor harness connector EM18 C

terminal and reliable grounding, Check if circuit exist condition of short-circuit of power
supply

Test Items

Standard Value

Resistance Between EM18 (C) and EM01 (70)

Less than 1 Ω

Resistance Between EM18 (C) and Reliable Ground

10 kΩ or higher

Voltage Between EM18 (C) and Reliable Ground

0V

Execute next step as per normal.

Step 7

Inspect Sensor Signal Circuit

(a) Rotated ignition switch to OFF position .

(b) Disconnect the intake camshaft position sensor wiring harness connector EM18.

(c) Disconnect ECM harness connector EM01.

Next

Repair the faulty part. Go to step 12

Next

Go to step 12

No

Go to step 8

Yes

ECMharness connectorEM01

258