Yes

Step 8

Diagnostic completed.

5. Repair Instructions:

Replace the post-catalytic oxygen sensor. Refer to 

2.4.7.1

 

Post-Catalytic Oxygen Sensor Replacement

.

2.2.7.17 DTC P0105 P0106 P0107 P0108

1. DTC Descriptor:

DTC

P0105

Intake Air Pressure Sensor Signal No Change (Frozen)

DTC

P0106

Intake Air Pressure Sensor Unreasonable

DTC

P0107

Intake Air Pressure Sensor Circuit Short to Ground

DTC

P0108

Intake Air Pressure Sensor Circuit Short to Power Supply

Intake Air Pressure Sensor responds to the pressure changes within the intake manifold. Pressure varies according to engine load.
The sensor circuit consists of the following:

•

5V Reference Voltage Circuit

•

Low Reference Voltage Circuit

•

Sensor Signal Circuit

ECM provides EN16 5 V reference voltage through ECM harness connector EN01 terminal No.19 to the sensor harness connector
EN16 terminal No.3. At the same time ECM provides a low reference voltage through EN01 terminal No.40 to the sensor harness
connector EN16 terminal No.1. The sensor provides a signal through EN16 terminal No.4 to ECM harness connector EN01 terminal
No.59, and the signal is related to the intake manifold pressure change. When the intake manifold absolute pressure is low, ECM
detected signal voltage will be low, such as at idle or during deceleration. When the intake manifold absolute pressure is high, ECM
detected signal voltage will be high, such as when the ignition switch is turned on and the engine is turned off, or when the throttle
fully open. Sensors are also used to determine the atmospheric pressure such as When the ignition switch is turned on and the
engine is turned off. As long as the engine running with the throttle fully open, atmospheric pressure readings will also be updated.
ECM monitors sensor signals in order to determine whether the voltage is beyond the normal range.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection Strategy

Conditions For Setting The DTC (Control

Strategy)

Fault Locations

P0105

Signal Inspection: The
pressure does not decrease
after starting.

1. The pressure drop is less than 2 kPa after

starting.

2. Engine speed is greater than 800 rpm.

1. Sensor Circuit

2. Sensor

3. ECM

P0106

Signal Unreasonable

Pressure Sensor Displayed Pressure.

P0107

Circuit Inspection, Over the
Maximum Limit

Pressure sensor voltage is less than 0.1 V.

Engine

Control System JL4G18-D

2-87

P0108

Circuit Inspection, Lower Than
the Maximum Limit

Pressure sensor voltage is greater than 4.9 V.

3. Schematic:

To Temperature Sensor

Engine 

Control 

Module

FE02-5016b

4. 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)

Sensor Housing Damage, Broken Vacuum Tubes.

(b)

Sensor Seal Damage.

(c)

Sensor Loose or Not Properly Installed.

(d)

Sensor Tube blockage.

Next

Note

It is not allowed to connect intake manifold absolute pressure sensor 5 V reference voltage circuit and other components
of the vehicle, as this will damage the sensors and ECM.

2-88

Control System JL4G18-D

Engine

Step 2

Measure intake manifold absolute pressure sensor 5 V reference voltage.

1

2

3

4

Intake Air Pressure Temperature 
Sensor Harness Connector EN16

FE02-5017b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect intake manifold absolute pressure sensor wiring
harness connector EN16.

(c)

Turn the ignition switch to "ON" position.

(d)

Measure intake manifold absolute pressure sensor wiring
harness connector EN16 terminal No.3 to a reliable ground
voltage.

Standard Voltage: 4.5V-5.5V

(e)

Connect intake manifold absolute pressure sensor wiring
harness connector EN16.

Is voltage the specified value?

No

Go to step 6

Yes

Step 3

Measure sensor signal circuit.

1

2

3

4

Intake Air Pressure Temperature 
Sensor Harness Connector EN16

FE02-5018b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect intake manifold absolute pressure sensor wiring
harness connector EN16.

(c)

Turn the ignition switch to "ON" position.

(d)

Between EN16 terminal No.3 and No.4, connect a 5A fuse
wire. Use scan tool to read "the actual intake manifold
absolute pressure sensor voltage" parameter.

Standard Parameter: 4.5V-5.5V

(e)

Connect intake manifold absolute pressure sensor wiring
harness connector EN16.

Is data normal?

No

Go to step 7

Yes

Step 4

Measure intake manifold absolute pressure sensor ground circuit.

Engine

Control System JL4G18-D

2-89

1

2

3

4

Intake Air Pressure Temperature 
Sensor Harness Connector EN16

FE02-5019b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect intake manifold absolute pressure sensor wiring
harness connector EN16.

(c)

Turn the ignition switch to "ON" position.

(d)

Measure resistance between intake manifold absolute
pressure sensor wiring harness connector EN16 terminal No.
1 and a reliable ground.

Standard Value: Less than 3 Ω

(e)

Connect intake manifold absolute pressure sensor wiring
harness connector EN16.

Is resistance normal?

No

Go to step 8

Yes

Step 5

Replace intake manifold absolute pressure sensor.

Next

Go to step 10

Step 6

Check sensor 5 V reference voltage circuit.

1

3

5

7

8

6

4

2

9

10

11

12

13

23

24

25

26

27

28

29

30

37

51

52

53

54

55

56

57

58

59

60

61

62

63

64

38

39

40

41

42

43

44

45

46

47

48

49

50

31

32

33

34

35

36

14

15

16

17

18

19

20

21

22

ECM Harness Connector EN01

1

2

3

4

Intake Air Pressure Temperature 

Sensor Harness Connector EN16

FE02-5020b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect intake manifold absolute pressure sensor wiring
harness connector EN16.

(c)

Disconnect ECM harness connector EN01.

(d)

Measure the resistance between intake manifold absolute
pressure sensor harness connector EN16 terminal No.3 and
ECM harness connector terminal No.19. Check whether the
circuit is open. If there is no open circuit, repair the faulty part.

(e)

Measure the resistance between intake manifold absolute
pressure sensor wiring harness connector EN16 terminal No.
3 and a reliable ground. Check whether there is a circuit short
to ground . If there is no short circuit, repair the faulty part.

(f)

Measure the voltage value between intake manifold absolute
pressure sensor wiring harness connector EN16 terminal No.
3 and a reliable ground. Check whether the circuit is short to
power supply. If there is no short circuit, repair the faulty part.

Test Items

Standard Value

Resistance Between EN16 (3) and EN01
(19)

Less than 1 Ω

Resistance Between EN16 (3) and A
Reliable Ground

10 kΩ or higher

Voltage Between EN16 (3) and A Reliable
Ground

0 V

Next

Go to step 9

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Control System JL4G18-D

Engine