Geely Emgrand X7. Manual part — 182

5. Maintenance

guide

:

Intake VVT Actuator can only be replaced as an assembly. Do not disassemble it and repair.
Replacement of VVT actuator and Camshaft.

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2.12.7.16 DTC P0068 P0106

1. DTC

description:

DTC P0068 Electronic Throttle Air Flow Error

DTC P0106 Intake Pressure/Throttle Position Fault

Intake Manifold Absolute Pressure (MAP) Sensor measures intake manifold pressure changes
caused by the engine load, intake manifold vacuum and engine speed changes, and convert these
changes into voltage output and send to the engine control module (ECM). At the same time the
engine control module (ECM) compares the actual and expected intake manifold absolute pressure
changes based on the throttle position opening change, to determine whether the intake manifold
absolute pressure sensor responds to throttle position opening change or not. Set DTC P0106 fault
accordingly.

Engine control module (ECM) detects air flow based on the intake manifold pressure sensor and
intake air temperature sensors measured data and compare the sir flow with expected air flow
based on throttle position sensor. If the engine control module (ECM) detects that the intake
manifold absolute pressure / temperature sensor detected actual air flow and expected air flow
based on throttle position sensor is inconsistent, it will set DTC P0068.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection Strategy

Conditions For Setting The
DTC (Control Strategy)

Fault Locations

P0068

Difference between intake
manifold absolute pressure
/ temperature sensor
detected air flow and the
expected air flow based on
throttle position is 200 g/s.

1. Engine

Running

2. No Intake Air Pressure /

Temperature Sensor Fault

3. Duration Longer Than 4s.

P0106

Atmosphere correction
pressure value is more than
high limit value.

Or less than low limit value

1. Engine

Running

2. No intake pressure sensor,

coolant temperature
sensor, ETC throttle
position sensor, fuel
injector, ignition coil and
misfire fault, etc.

3. Coolant temperature is

higher than 60 (140

℃

ºF)。

4. Duration Longer Than

15s.

1. Intake

manifold
pressure
/temperature
Sensor

2. Intake

manifold and
Vacuum Tube

3. Throttle

valve

4. ECM

3. 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 Initial

Inspection

Inspect if there are the following conditions:

A. Damaged Intake Manifold Pressure / Temperature Sensor Housing Is, Broken Vacuum Tubes

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B. Damaged Intake Manifold Pressure / Temperature Sensor Seals

C. Intake Manifold Pressure / Temperature Sensor Loose or Improperly Installed

D. Throttle seals is damaged, causing air leaks.

2

Inspect whether there is control system DTC code other than DTC P0068
P0106.

A. Connect fault diagnosis tester to the vehicle diagnostic interface.

B. Rotated ignition switch to ON position .

C. Press the power button of fault diagnosis tester.

D. Select the following menu items: Engine/Read DTC codes.

E. Read DTC codes.

Results

DTC Codes Shown

To Step

DTC P0068 P0106

No

DTC Code Other Than DTC P0068 P0106

Yes

3

Inspect the atmospheric pressure parameter in the fault diagnosis data list.

A) Compare the atmospheric pressure parameter and the actual atmospheric pressure, refer to the

"2.12.1.3 Relationship between Altitude and Atmospheric Pressure" in “Engine Control
System”.

Are the two similar?

4

Inspect the intake manifold pressure (MAP) sensor value with the engine
running.

A. Start

the

engine.

B. When idling, observe the intake manifold pressure (MAP) sensor values.

C. During acceleration, observe the intake manifold pressure (MAP) sensor values.

D. Compare the above intake manifold pressure (MAP) sensor values.

Are above intake manifold pressure (MAP) sensor values changed?

No

Replace the intake manifold pressure /
temperature sensor.

Yes

Yes

2.12.7.14 DTC Chapter Index

Yes

Next

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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?

Yes

Clean and service the intake manifold
and vacuum tubes.

Replace the intake manifold pressure
sensor.

No

Yes

Go to step 9

No

Yes

Clean and service the intake manifold
and vacuum tubes.

No

Go to step 9

No

Replace the intake manifold pressure /
temperature sensor.

Yes

Yes

Go to step 7

No

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