Geely Emgrand X7. Manual part — 41

5

Inspect the intake manifold pressure sensor.

A. Shut down the engine.

B. Turn the ignition switch to ON.

C. Without disconnecting the intake manifold pressure sensor wiring harness connector, pull out

the intake manifold pressure sensor from the intake manifold and use the vacuum pump.
install the vacuum pump tube to the intake manifold pressure sensor.

D. Apply 50 kPa pressure on the intake manifold pressure sensor. Observe whether the intake

manifold pressure (MAP) sensor value changes?

6

Inspect the intake manifold pressure sensor installation port and vacuum tubes.

A. Inspect the intake manifold pressure sensor installation port and vacuum tubes.

Are the installation port and vacuum tubes blocked?

7

Inspect whether the intake manifold pressure sensor parameter responds to changes.

A. Engine

Running

B. After changed throttle valve. Stuck throttle valve, look at air intake manifold pipe pressure

sensor .

Whether the sensor parameter value is rapidly changed according to the change of the position of
the throttle.

Does intake manifold pressure (MAP) sensor value rapidly change with the throttle position
changes?

8

Inspect the intake manifold pressure sensor installation port and vacuum tubes.

A. Inspect the intake manifold pressure sensor installation port and vacuum tubes.

Are the installation port and vacuum tubes blocked?

9

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

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

Yes

Clean and service the intake manifold and
vacuum tubes.

No

Replace the intake manifold pressure
sensor.

Yes

Go to step 9

No

No

Replace the intake manifold pressure /
temperature sensor.

Yes

Yes

Clean and service the intake manifold and
vacuum tubes.

No

Go to step 9

163

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 2.2.7.11 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 as per 2.2.8.3 “Replacement of Intake Pressure
Temperature Sensor”.

Replace ECM. Refer to 2.2.8.1 Replacement of Engine Control Module.

No

Refer to 2.2.7.3 Intermittent Fault
Inspection for intermittent fault.

Yes

Next

No

Repair the faulty part.

Yes

Yes

Troubleshooting

No

164

2.2.7.17 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 EM01 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

165

3. Circuit

sketch

主继电器ER09

87

30

86

85

EM01

44

EM01

A

B

发

动

机
控

制

模

块

蓄电池

EF4

0

EF22

VVT电磁阀

VVT1(PWM)

43

MPR

NL02-0032c

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 EM13.

(b) Measure the resistance between

the two intake VVT solenoid
valve terminals.

Standard Resistance

It is 7.2Ω with 20℃(68oF)

(c) Connect VVT solenoid valve

harness connector.

进气VVT电磁阀线束连接器 EM13

1

2

NL02-0031c

Step 2

Measure VVT solenoid valve working power supply.

(a) Rotated ignition switch to OFF position .

No

Replace VVT solenoid valve assembly.Go
to step 7

Yes

Main relay ER09

VVT electromagnetic valve

Battery

Engi

ne

co

ntr

ol mo

dul

e

Air intakeVVT electromagnetic valve

harnessconnectorEM13

166