Geely Emgrand X7. Manual part — 183

9

Use fault diagnosis tester to confirm if DTC is stored again .

A. Connect fault diagnosis tester to the data link connector.

B. Rotated 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 exported.

.

10

Inspect ECM power supply circuit.

A. Inspect whether ECM power supply circuit is normal.

B. Inspect whether ECM ground circuit is normal.

11 Replace

ECM

A. Replaces

.

B. Carry out the crankshaft position sensor learning, refer to 2.12.7.11 Crankshaft Position

Sensor (CKP) Learning.

12

Use fault diagnosis tester to confirm if DTC is stored again .

A. Connect fault diagnosis tester to the data link connector.

B. Rotated 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 10min.

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

13 Troubleshooting

5. Maintenance

guide:

Replace Intake Pressure Temperature Sensor, refer to 2.12.8.3 “Replacement of Intake Pressure
Temperature Sensor”.

Replace ECM. Refer to 2.12.8.1 Replacement of Engine Control Module.

No

Refer to 2.12.7.3 Intermittent Fault
Inspection for intermittent fault.

Yes

Next

No

Repair the faulty part.

Yes

Yes

Troubleshooting

No

731

2.12.7.17 DTC P0076 P0077

1. DTC

description:

DTC P0076 Intake VCP Hydraulic Control Valve Coil Low Voltage or Open Circuit

DTC P0077 Intake VCP Hydraulic Control Valve Coil High Voltage

Intake camshaft position (CMP) actuator is connected to the intake camshaft and operated by the
hydraulic pressure, which is provided by the oil pump in order to change the intake camshaft to
the CKP (CKP) relative angle. Intake VVT solenoid valve power is provided from the main relay.
ECM controls ground with a pulse-width modulation signal to control the engine oil flow to the
camshaft position actuator. Oil pressure moves a security slide valve within the camshaft position
actuator body at the front of the camshaft. When the safety slide valve moves, the oil is imported
to the camshaft position actuator to rotate the camshaft. The intake camshaft actuator change the
camshaft working angle up to 50 degrees.

ECM controls the solenoid valve internal ground through ECM harness connector EN01 terminal
No.43. There is a feedback circuit within ECM. Engine ECM monitors feedback signals to
determine whether the control circuit is open, short to ground or short to voltage If ECM detects
the control circuit voltage is within the specified range when the control circuit is instructed to
disconnect, it will set this DTC code.

2. Conditions For Setting DTC and The Fault Location:

DTC
Code

DTC Detection
Strategy

Conditions For Setting The
DTC (Control Strategy)

Fault Locations

P0076

P0077

Hardware Circuit
Inspection

1. Circuit

Open

2. Circuit Short To Power

Supply

3. Circuit Short To Ground

1. Solenoid Valve

Circuit

2. Solenoid

Valve

3. ECM

3. Circuit

sketch

NL02-2033b

BAT

15A

E

F

2

1

86

87

30

85

发动机主继电器

44

EN01

ECM

MPR

43

EN01

1

EN10

2

EN10

VVT电磁阀

VVT1

Engine main relay

VVT electromagnetic valve

732

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.

1

Measure VVT solenoid valve resistance.

(a) Disconnect intake VVT solenoid

valve harness connector EN10.

(b) Measure the resistance between

the two intake VVT solenoid
valve terminals.

Standard Resistance

7.2Ω with 20 (68ºF)

℃

(c) Connect VVT solenoid valve

harness connector.

NL02-2034b

Step 2

Measure VVT solenoid valve working power supply.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect VVT solenoid valve

harness connector EN10.

(c) Rotated ignition switch to ON

position .

(d) Use multimeter to measure EN10

connector terminal 1.

Standard Voltage: 11-14V

(e) Connect VVT solenoid valve

harness connector EN10.

NL02-2035b

1

2

EN10 VVT电磁阀线束连接器

1

Step 3

Inspect VVT solenoid valve control circuit.

No

Inspect whether circuit between EN10 solenoid valve
harness connector terminal No.1 and main relay terminal
No.30 is open or short to ground.

Yes

No

Replace VVT solenoid valve assembly. Go
to step 7

Yes

VVT electromagnetic valve

EN10VVT electromagnetic valve

harness connector

733

(a) Rotated ignition switch to OFF

position .

(b) Disconnect VVT solenoid valve

harness connector EN10.

(c)

Disconnect ECM harness
connector EN01.

(d) Use multimeter to measure the

resistance between VVT solenoid
valve harness connector EN10
terminal No.2 and ECM harness
connector EN01 terminal 43. For
the Standard Value. Refer to the
table below.

NL02-2036b

1

2

EN10 VVT电磁阀线束连接器

2

(e) Use multimeter to measure the

resistance between VVT solenoid
valve wiring harness connector
EN10 terminal 2 and the ground.
For the Standard Value. Refer to
the table below.

(f) Turn the ignition switch to "ON"

position, (Note: At this point
EN01, EN10 connectors must be
disconnected) Measure voltage
between VVT solenoid valve
wiring harness connector EN10
terminal B and a reliable ground
with a multimeter. The Standard
Value is in the table below.

NL02-2037b

EN01 发动机控制模块线束连接器

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

43

Test Connection

Standard Value

EN10(2)--EN01(43) resistance

Less than 1 Ω

EN10(2)--grounding resistance

10kΩ or higher

EN10(2)--grounding voltage Less

than

0

V

Step 4

Inspect the ECM Power Supply Circuits.

(a) Inspect whether ECM power supply circuit is normal.

(b) Inspect whether ECM ground circuit is normal.

No

Repair or replace harness connector

Yes

No

Repair or replace harness connector

Yes

EN10VVT electromagnetic valve

harness connector

EN01 engine control module harness

connector

734