FE02-0046b

(a)

Remove the VVT solenoid valve filter.

(b)

Check whether the filter is blocked.

(c)

Check whether the filter is damaged.

(d)

Reinstall the VVT solenoid valve filter.

No

Clean VVT solenoid valve filter. If necessary,
replace it.

Yes

Step 6

Check whether the timing system is normal.

B

C

D

A

Timing Chain Cover Surface

FE02-0143b

(a)

Remove the cylinder head cover.

(b)

Align point D shown in the graphic. Rotate the crankshaft
pulley, so that the timing mark on the pulley groove aligns
with "0" marked on the timing chain cover.

(c)

Check points C alignment shown in the graphic. The
camshaft timing gear timing marks should be at horizontal
positions as shown in the graphic.

(d)

Check points A,B alignment shown in the graphic. Make sure
intake, exhaust camshaft gear timing marks distance
between A and B is 8 timing chain sections.

(e)

Reinstall the cylinder head cover.

Are timing marks shown as in the graphic?

No

Adjust the valve timing

Yes

Step 7

Replace the VVT actuator.

Next

Step 8

Check control system DTC codes.

(a)

Connect scan tool to the datalink connector.

(b)

Turn the ignition switch to "ON" position.

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Control System JL4G15-D

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(c)

Press the scan tool power button.

(d)

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

(e)

Read DTC codes.

Any DTC code?

No

Intermittent Fault. Refer to

2.12.7.4

 

Symptoms Table

Yes

Step 9

System normal, diagnostic completed.

5. Repair Instructions:

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

2.6.8.12

 

Camshaft Replacement

.

2.12.7.16 DTC P0068 P0106

1. DTC Descriptor:

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 and whether or not set DTC P0106.

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 9g/s.

1. Engine Running

2. No Intake Air Pressure / Temperature

Sensor Fault

3. Duration Longer Than 4 s

1. Intake Manifold Pressure /

Temperature Sensor

2. Intake Manifold and Vacuum Tube

3. Throttle

4. ECM

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P0106

Atmospheric Pressure Greater
Than The Maximum or Less
Than The Minimum

1. Engine Running

2. No intake air pressure sensor,

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

3. Coolant temperature is higher than

60°C (140 ºF).

4. Duration Longer Than 15 s

3. 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

Check the existence of the following conditions:

(a)

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

(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.

Next

Step 2

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

(a)

Connect scan tool to the datalink connector.

(b)

Turn the ignition switch to "ON" position.

(c)

Press the scan tool power button.

(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

Yes

2.12.7.14

 

DTC Code Index

No

Step 3

Check scan tool atmospheric pressure data.

(a)

Compare the actual atmospheric pressure with atmospheric
pressure parameter. Refer to "4G18-D Engine Control

Engine

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System

2.2.1.3

 

Altitude and Atmospheric Pressure

Correlation

".

Similar?

No

Replace the intake manifold pressure /
temperature sensor.

Yes

Step 4

Check 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?

Yes

Go to step 7

No

Step 5

Check 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?

No

Replace the intake manifold pressure /
temperature sensor.

Yes

Step 6

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

(a)

Check 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.

No

Go to step 9

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